fast path added

- Add licenses/AGPL-3.0.txt (full license text for scripts/pymupdf_convert.py)
- Update root LICENSE to reference it
- Fix Spotless formatting in PyMuPdfConverter and ExternalAppDepConfig

.github/actions/setup-bot/action.yml

@@ -24,7 +24,7 @@ runs:
       id: generate-token
       uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
       with:
-        app-id: ${{ inputs.app-id }}
+        client-id: ${{ inputs.app-id }}
         private-key: ${{ inputs.private-key }}
     - name: Configure Git
       run: |

.github/config/.files.yaml

@@ -38,6 +38,8 @@ project: &project
   - frontend/**
   - docker/**
   - scripts/RestartHelper.java
+  - scripts/db-migration/**
+  - .github/workflows/db-migration-test.yml
 
 frontend: &frontend
   - frontend/**

.github/scripts/check_language_toml.py

@@ -13,7 +13,7 @@ Usage:
 """
 
 # Sample for Windows:
-# python .github/scripts/check_language_toml.py --reference-file frontend/public/locales/en-GB/translation.toml --branch "" --files frontend/public/locales/de-DE/translation.toml frontend/public/locales/fr-FR/translation.toml
+# python .github/scripts/check_language_toml.py --reference-file frontend/editor/public/locales/en-GB/translation.toml --branch "" --files frontend/editor/public/locales/de-DE/translation.toml frontend/editor/public/locales/fr-FR/translation.toml
 
 import argparse
 import glob
@@ -184,7 +184,7 @@ def check_for_differences(reference_file, file_list, branch, actor):
     if len(file_list) == 1:
         file_arr = file_list[0].split()
 
-    base_dir = Path.cwd() / "frontend" / "public" / "locales"
+    base_dir = Path.cwd() / "frontend" / "editor" / "public" / "locales"
 
     for file_path in file_arr:
         file_path = Path(file_path)
@@ -308,7 +308,7 @@ def check_for_differences(reference_file, file_list, branch, actor):
         report.append("## ❌ Overall Check Status: **_Failed_**")
         report.append("")
         report.append(
-            f"@{actor} please check your translation if it conforms to the standard. Follow the format of [en-GB/translation.toml](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/frontend/public/locales/en-GB/translation.toml)"
+            f"@{actor} please check your translation if it conforms to the standard. Follow the format of [en-GB/translation.toml](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/frontend/editor/public/locales/en-GB/translation.toml)"
         )
     else:
         report.append("## ✅ Overall Check Status: **_Success_**")
@@ -372,6 +372,7 @@ if __name__ == "__main__":
                 os.path.join(
                     os.getcwd(),
                     "frontend",
+                    "editor",
                     "public",
                     "locales",
                     "*",

.github/workflows/PR-Auto-Deploy-V2.yml

@@ -287,6 +287,7 @@ jobs:
                 - /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/data:/usr/share/tessdata:rw
                 - /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/config:/configs:rw
                 - /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/logs:/logs:rw
+                - /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/storage:/storage:rw
               environment:
                 DISABLE_ADDITIONAL_FEATURES: "false"
                 SECURITY_ENABLELOGIN: "true"
@@ -309,7 +310,7 @@ jobs:
 
           ssh -i ../private.key -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -T ${{ secrets.NEW_VPS_USERNAME }}@${{ secrets.NEW_VPS_HOST }} << ENDSSH
             # Create V2 PR-specific directories
-            mkdir -p /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/{data,config,logs}
+            mkdir -p /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/{data,config,logs,storage}
 
             # Move docker-compose file to correct location
             mv /tmp/docker-compose-v2.yml /stirling/V2-PR-${{ needs.check-pr.outputs.pr_number }}/docker-compose.yml

.github/workflows/ai-engine.yml

@@ -1,8 +1,9 @@
 name: AI Engine CI
 
-# Validates the Python AI engine: regenerates tool models, runs fixers,
-# lint, type-check, and tests. Called from build.yml on PRs and merge_group;
-# also runs directly on push to main as a post-merge safety net.
+# Validates the Python AI engine: regenerates tool models and runs the
+# engine quality gate (lint, type-check, format-check, tests). Called from
+# build.yml on PRs and merge_group; also runs directly on push to main as
+# a post-merge safety net.
 on:
   workflow_call:
   push:
@@ -51,27 +52,95 @@ jobs:
         run: task engine:tool-models
 
       - name: Verify tool models are up to date
+        id: tool-models-check
+        continue-on-error: true
+        run: git diff --exit-code engine/src/stirling/models/tool_models.py
+
+      - name: Comment on tool models check failure
+        # Only post a comment on PRs. github-script's PR helpers need an
+        # issue/PR number, which doesn't exist on merge_group runs.
+        if: steps.tool-models-check.outcome == 'failure' && github.event_name == 'pull_request'
+        continue-on-error: true
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const marker = '<!-- tool-models-check -->';
+            const body = [
+              marker,
+              '### Tool Models Check Failed',
+              '',
+              'The generated `engine/src/stirling/models/tool_models.py` is out of date with the Java OpenAPI spec and will need to be regenerated before it can be merged in.',
+              '',
+              'Run `task engine:tool-models` to regenerate, then commit the updated file.',
+            ].join('\n');
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+            const existing = comments.find(c => c.body.includes(marker));
+            if (existing) {
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+                body,
+              });
+            } else {
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body,
+              });
+            }
+
+      - name: Fail if tool models check failed
+        if: steps.tool-models-check.outcome == 'failure'
         run: |
-          if ! git diff --exit-code engine/src/stirling/models/tool_models.py; then
-            echo "tool_models.py is out of date."
-            echo "Run 'task engine:tool-models' locally and commit the updated file."
-            exit 1
-          fi
+          echo "============================================"
+          echo "  Tool Models Check Failed"
+          echo "============================================"
+          echo ""
+          echo "The generated engine/src/stirling/models/tool_models.py"
+          echo "is out of date with the Java OpenAPI spec and will"
+          echo "need to be regenerated before it can be merged in."
+          echo ""
+          echo "Run 'task engine:tool-models' to regenerate, then"
+          echo "commit the updated file."
+          echo "============================================"
+          exit 1
 
-      - name: Run fixers
-        run: task engine:fix
+      - name: Remove tool models check comment on success
+        if: steps.tool-models-check.outcome == 'success' && github.event_name == 'pull_request'
+        continue-on-error: true
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const marker = '<!-- tool-models-check -->';
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+            const existing = comments.find(c => c.body.includes(marker));
+            if (existing) {
+              await github.rest.issues.deleteComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+              });
+            }
 
-      - name: Verify fixes are committed
-        id: fixer_changes
-        run: |
-          if ! git diff --quiet; then
-            git --no-pager diff --stat
-            echo "::error::There are issues with your Python code that will need to be fixed before they can be merged in. Run 'task engine:fix' to auto-fix what can be fixed automatically, then run 'task engine:check' to see what still needs fixing manually."
-            exit 1
-          fi
+      - name: Quality-check engine
+        id: engine-check
+        run: task engine:check
+        continue-on-error: true
 
-      - name: Comment on fixer failures
-        if: steps.fixer_changes.outcome == 'failure' && github.event_name == 'pull_request'
+      - name: Comment on engine check failure
+        # Only post a comment on PRs. github-script's PR helpers need an
+        # issue/PR number, which doesn't exist on merge_group runs.
+        if: steps.engine-check.outcome == 'failure' && github.event_name == 'pull_request'
         continue-on-error: true
         uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
@@ -107,11 +176,39 @@ jobs:
               });
             }
 
-      - name: Run linting
-        run: task engine:lint
+      - name: Fail if engine check failed
+        if: steps.engine-check.outcome == 'failure'
+        run: |
+          echo "============================================"
+          echo "  Engine Check Failed"
+          echo "============================================"
+          echo ""
+          echo "There are issues with your Python code that"
+          echo "will need to be fixed before they can be merged in."
+          echo ""
+          echo "Run 'task engine:fix' to auto-fix what can be"
+          echo "fixed automatically, then run 'task engine:check'"
+          echo "to see what still needs fixing manually."
+          echo "============================================"
+          exit 1
 
-      - name: Run type checking
-        run: task engine:typecheck
-
-      - name: Run tests
-        run: task engine:test
+      - name: Remove engine check comment on success
+        if: steps.engine-check.outcome == 'success' && github.event_name == 'pull_request'
+        continue-on-error: true
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const marker = '<!-- engine-check -->';
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+            const existing = comments.find(c => c.body.includes(marker));
+            if (existing) {
+              await github.rest.issues.deleteComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+              });
+            }

.github/workflows/backend-build.yml

@@ -67,7 +67,7 @@ jobs:
           MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
           MAVEN_PUBLIC_URL: ${{ secrets.MAVEN_PUBLIC_URL }}
 
-      - name: Comment on Java formatting failure
+      - name: Comment on backend format check failure
         # Only post a comment on PRs. github-script's PR helpers need an
         # issue/PR number, which doesn't exist on merge_group runs.
         if: steps.spotless-check.outcome == 'failure' && github.event_name == 'pull_request'
@@ -78,15 +78,11 @@ jobs:
             const marker = '<!-- java-formatting-check -->';
             const body = [
               marker,
-              '### Java Formatting Check Failed',
+              '### Backend Format Check Failed',
               '',
-              'Your code has formatting issues. Run the following command to fix them:',
+              'There are formatting issues in your Java code that will need to be fixed before they can be merged in.',
               '',
-              '```bash',
-              'task backend:format',
-              '```',
-              '',
-              'Then commit and push the changes.',
+              'Run `task backend:format` to auto-fix, then commit and push the changes.',
             ].join('\n');
             const { data: comments } = await github.rest.issues.listComments({
               owner: context.repo.owner,
@@ -110,22 +106,43 @@ jobs:
               });
             }
 
-      - name: Fail if Java formatting issues found
+      - name: Fail if backend format check failed
         if: steps.spotless-check.outcome == 'failure'
         run: |
           echo "============================================"
-          echo "  Java Formatting Check Failed"
+          echo "  Backend Format Check Failed"
           echo "============================================"
           echo ""
-          echo "Your code has formatting issues."
-          echo "Run the following command to fix them:"
+          echo "There are formatting issues in your Java code"
+          echo "that will need to be fixed before they can be"
+          echo "merged in."
           echo ""
-          echo "  task backend:format"
-          echo ""
-          echo "Then commit and push the changes."
+          echo "Run 'task backend:format' to auto-fix, then"
+          echo "commit and push the changes."
           echo "============================================"
           exit 1
 
+      - name: Remove backend format check comment on success
+        if: steps.spotless-check.outcome == 'success' && github.event_name == 'pull_request'
+        continue-on-error: true
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const marker = '<!-- java-formatting-check -->';
+            const { data: comments } = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+            const existing = comments.find(c => c.body.includes(marker));
+            if (existing) {
+              await github.rest.issues.deleteComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: existing.id,
+              });
+            }
+
       - name: Build with Gradle and spring security ${{ matrix.spring-security }}
         run: task backend:build:ci
         env:

.github/workflows/build.yml

@@ -68,6 +68,18 @@ jobs:
     uses: ./.github/workflows/backend-build.yml
     secrets: inherit
 
+  db-migration-test:
+    # Boots the current bootJar against H2 fixtures captured from past
+    # releases (v2.0.0 / v2.5.0 / v2.10.0) and verifies admin login still
+    # works after Hibernate's ddl-auto=update migrates the schema. Gated on
+    # the `project` filter so doc-only PRs skip this ~5-minute job.
+    if: needs.files-changed.outputs.project == 'true'
+    needs: [files-changed]
+    permissions:
+      contents: read
+    uses: ./.github/workflows/db-migration-test.yml
+    secrets: inherit
+
   check-generateOpenApiDocs:
     if: needs.files-changed.outputs.openapi == 'true'
     needs: [files-changed]
@@ -184,6 +196,7 @@ jobs:
     needs:
       - files-changed
       - build
+      - db-migration-test
       - check-generateOpenApiDocs
       - frontend-validation
       - playwright-e2e
@@ -208,6 +221,7 @@ jobs:
           RESULTS: |
             files-changed=${{ needs.files-changed.result }}
             build=${{ needs.build.result }}
+            db-migration-test=${{ needs.db-migration-test.result }}
             check-generateOpenApiDocs=${{ needs.check-generateOpenApiDocs.result }}
             frontend-validation=${{ needs.frontend-validation.result }}
             playwright-e2e=${{ needs.playwright-e2e.result }}

.github/workflows/db-migration-test.yml

@@ -0,0 +1,93 @@
+name: DB migration smoke test
+
+# Boots the current Stirling-PDF JAR against H2 fixtures captured from past
+# releases (v2.0.0 / v2.5.0 / v2.10.0) and verifies admin login still works.
+# Catches schema changes that would break existing user databases under
+# Hibernate's `ddl-auto=update` upgrade path.
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  pick:
+    uses: ./.github/workflows/_runner-pick.yml
+
+  migration-test:
+    needs: pick
+    runs-on: ${{ needs.pick.outputs.is_fork == 'true' && 'ubuntu-latest' || 'depot-ubuntu-24.04-8' }}
+    timeout-minutes: 30
+    env:
+      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
+    steps:
+      - name: Harden Runner
+        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
+        with:
+          egress-policy: audit
+
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Set up JDK 25
+        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
+        with:
+          java-version: 25
+          distribution: temurin
+
+      - name: Cache Gradle dependency artifacts
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        with:
+          path: |
+            ~/.gradle/wrapper
+            ~/.gradle/caches/modules-2/files-2.1
+            ~/.gradle/caches/modules-2/metadata-2.*
+          key: gradle-deps-${{ runner.os }}-jdk-25-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties', '**/*.gradle', '**/*.gradle.kts', 'settings.gradle', 'settings.gradle.kts', 'gradle/libs.versions.toml') }}
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
+        with:
+          gradle-version: 9.3.1
+          cache-disabled: true
+
+      # No `-PnoSpotless` here yet because the upstream cache layer matches the
+      # backend build's; reuse keeps cold-cache cost identical.
+      - name: Build Stirling-PDF JAR
+        env:
+          MAVEN_USER: ${{ secrets.MAVEN_USER }}
+          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
+          MAVEN_PUBLIC_URL: ${{ secrets.MAVEN_PUBLIC_URL }}
+        run: ./gradlew :stirling-pdf:bootJar -PnoSpotless --no-daemon
+
+      - name: Locate built JAR
+        id: jar
+        run: |
+          jar=$(find app/core/build/libs -maxdepth 1 -name 'Stirling-PDF*.jar' -o -name 'stirling-pdf*.jar' 2>/dev/null \
+              | grep -vE '(-plain|-sources)\.jar$' | head -n 1)
+          if [[ -z "$jar" ]]; then
+            echo "::error::No JAR under app/core/build/libs"
+            ls -lah app/core/build/libs || true
+            exit 1
+          fi
+          # Absolute path - the migration script pushd's into a temp workdir
+          # before invoking java, which would dangle a relative path.
+          jar=$(realpath "$jar")
+          echo "path=$jar" >> "$GITHUB_OUTPUT"
+          echo "Built JAR: $jar"
+
+      - name: Run migration smoke test
+        env:
+          STIRLING_JAR: ${{ steps.jar.outputs.path }}
+        run: bash scripts/db-migration/run-migration-test.sh
+
+      - name: Upload app logs on failure
+        if: failure()
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: db-migration-app-logs
+          # Path matches the preserved workdir in run-migration-test.sh -
+          # only failing fixtures leave a directory behind.
+          path: /tmp/stirling-migration-failed-*/app.log
+          retention-days: 7
+          if-no-files-found: warn

.github/workflows/multiOSReleases.yml

@@ -586,21 +586,23 @@ jobs:
         if: always() && steps.digicert-setup.conclusion != 'failure'
         shell: bash
         run: |
-          mkdir -p ./dist
+          # Absolute dist path so the cd below can't break the copy targets.
+          DIST="$GITHUB_WORKSPACE/dist"
+          mkdir -p "$DIST"
           cd ./frontend/editor/src-tauri/target
 
           # Find and rename artifacts based on platform
           if [ "${{ matrix.platform }}" = "windows-latest" ]; then
             # Only ship the MSI installer on Windows. The loose exe and WiX toolset exes
             # are not the user-facing installer - the MSI contains the signed inner exe.
-            find . -name "*.msi" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.msi" \;
+            find . -name "*.msi" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.msi" \;
           elif [ "${{ matrix.platform }}" = "macos-15" ]; then
-            find . -name "*.dmg" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.dmg" \;
-            find . -name "*.app" -exec cp -r {} "../../../dist/Stirling-PDF-${{ matrix.name }}.app" \;
+            find . -name "*.dmg" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.dmg" \;
+            find . -name "*.app" -exec cp -r {} "$DIST/Stirling-PDF-${{ matrix.name }}.app" \;
           else
-            find . -name "*.deb" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.deb" \;
-            find . -name "*.rpm" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.rpm" \;
-            find . -name "*.AppImage" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.AppImage" \;
+            find . -name "*.deb" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.deb" \;
+            find . -name "*.rpm" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.rpm" \;
+            find . -name "*.AppImage" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.AppImage" \;
           fi
 
       - name: Upload build artifacts

.github/workflows/tauri-build.yml

@@ -157,6 +157,9 @@ jobs:
           JPDFIUM_PLATFORMS: ${{ matrix.jpdfium_platforms }}
         run: task desktop:prepare
 
+      - name: Run Tauri/Cargo tests
+        run: task desktop:test
+
       # DigiCert KeyLocker Setup (Cloud HSM)
       - name: Setup DigiCert KeyLocker
         id: digicert-setup
@@ -417,20 +420,22 @@ jobs:
       - name: Rename artifacts
         shell: bash
         run: |
-          mkdir -p ./dist
+          # Absolute dist path so the cd below can't break the copy targets.
+          DIST="$GITHUB_WORKSPACE/dist"
+          mkdir -p "$DIST"
           cd ./frontend/editor/src-tauri/target
 
           # Find and rename artifacts based on platform
           if [ "${{ matrix.platform }}" = "windows-latest" ]; then
             # Only ship the MSI installer. The loose exe and WiX toolset exes
             # are not the user-facing installer - the MSI contains the signed inner exe.
-            find . -name "*.msi" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.msi" \;
+            find . -name "*.msi" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.msi" \;
           elif [ "${{ matrix.platform }}" = "macos-15" ]; then
-            find . -name "*.dmg" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.dmg" \;
+            find . -name "*.dmg" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.dmg" \;
           else
-            find . -name "*.deb" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.deb" \;
-            find . -name "*.rpm" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.rpm" \;
-            find . -name "*.AppImage" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.AppImage" \;
+            find . -name "*.deb" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.deb" \;
+            find . -name "*.rpm" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.rpm" \;
+            find . -name "*.AppImage" -exec cp {} "$DIST/Stirling-PDF-${{ matrix.name }}.AppImage" \;
           fi
 
       # Verify the MSI AND the inner exe extracted from it are signed.

.gitignore

@@ -23,6 +23,10 @@ customFiles/
 configs/
 watchedFolders/
 clientWebUI/
+# Scratch dir used by local fixture-regeneration runs (see
+# app/proprietary/src/test/resources/db-migration-fixtures/README.md).
+# Holds downloaded JARs and disposable workdirs. Never committed.
+.alpha-local/
 !cucumber/
 !cucumber/exampleFiles/
 !cucumber/exampleFiles/example_html.zip
@@ -174,7 +178,6 @@ venv.bak/
 
 # Env files (secrets / local overrides). Subproject .gitignore files whitelist any committed defaults.
 .env*
-!.env.saas.example
 
 # VS Code
 /.vscode/**/*
@@ -274,3 +277,6 @@ docs/type3/signatures/
 # Playwright MCP screenshots / traces
 .playwright-mcp/
 *.playwright-mcp.png
+
+# Local screenshot artifacts from *-screenshots.spec.ts
+frontend/screenshots/

.taskfiles/backend.yml

@@ -22,12 +22,13 @@ tasks:
     vars:
       PORT: '{{.PORT | default "8080"}}'
       AIENGINE_URL: '{{.AIENGINE_URL | default ""}}'
+      AIENGINE_TIMEOUTSECONDS: '{{.AIENGINE_TIMEOUTSECONDS | default "120"}}'
     env:
       SERVER_PORT: '{{.PORT}}'
     cmds:
-      - cmd: '{{if .AIENGINE_URL}}AIENGINE_URL={{.AIENGINE_URL}} AIENGINE_ENABLED=true {{end}}cmd /c ".\gradlew.bat :stirling-pdf:bootRun"'
+      - cmd: '{{if .AIENGINE_URL}}AIENGINE_URL={{.AIENGINE_URL}} AIENGINE_ENABLED=true AIENGINE_TIMEOUTSECONDS={{.AIENGINE_TIMEOUTSECONDS}} {{end}}cmd /c ".\gradlew.bat :stirling-pdf:bootRun"'
         platforms: [windows]
-      - cmd: '{{if .AIENGINE_URL}}AIENGINE_URL={{.AIENGINE_URL}} AIENGINE_ENABLED=true {{end}}./gradlew :stirling-pdf:bootRun'
+      - cmd: '{{if .AIENGINE_URL}}AIENGINE_URL={{.AIENGINE_URL}} AIENGINE_ENABLED=true AIENGINE_TIMEOUTSECONDS={{.AIENGINE_TIMEOUTSECONDS}} {{end}}./gradlew :stirling-pdf:bootRun'
         platforms: [linux, darwin]
 
   dev:bundled:
@@ -40,10 +41,10 @@ tasks:
         platforms: [linux, darwin]
 
   dev:saas:
-    desc: "Start backend in SaaS flavor against Supabase (loads .env.saas.local)"
+    desc: "Start backend in SaaS flavor against Supabase"
     # `dotenv:` reads from the root Taskfile's directory (".") because this
-    # subtaskfile is included with `dir: .`. Drop the file at the repo root.
-    dotenv: ['.env.saas.local']
+    # subtaskfile is included with `dir: .`.
+    dotenv: ['app/.env.saas.local', 'app/.env.saas']
     ignore_error: true
     vars:
       PORT: '{{.PORT | default "8080"}}'

.taskfiles/desktop.yml

@@ -78,6 +78,13 @@ tasks:
     cmds:
       - npx tauri build --bundles appimage
 
+  test:
+    desc: "Run Tauri/Cargo tests"
+    deps: [prepare]
+    dir: editor/src-tauri
+    cmds:
+      - cargo test
+
   clean:
     desc: "Clean Tauri/Cargo build artifacts"
     dir: editor
@@ -126,8 +133,29 @@ tasks:
         --no-header-files
         --no-man-pages
         --output runtime/jre
+      # jlink emits its files mode 444 (read-only). Tauri's build-script
+      # resource copier preserves source permissions when staging
+      # `runtime/jre/**/*` into `target/<profile>/runtime/jre/...`, so the
+      # staged copies are read-only too. On any subsequent incremental
+      # build the copier tries to overwrite them and fails with a bare
+      # `Permission denied (os error 13)` (Rust's io::Error Display drops
+      # the path, so the failure is opaque). Make the source writable here
+      # so the staged destinations are writable and can be overwritten.
+      #
+      # Trade-off: this task runs for both `task desktop:dev` and
+      # `task desktop:build`, so production bundles also ship mode-644
+      # JRE files instead of 444. Functionally harmless on POSIX (the
+      # `other` bit is `r--` either way, and on macOS code signing is the
+      # real integrity check) and on Windows the DOS read-only attribute
+      # isn't load-bearing for the bundled JDK. If we ever need strict
+      # 444 in production, split the chmod into a dev-only step and have
+      # `desktop:build` run `jlink:clean` first to force a fresh build.
+      - cmd: chmod -R u+w runtime/jre
+        platforms: [linux, darwin]
+      - cmd: powershell -NoProfile -Command "Get-ChildItem -Recurse runtime/jre | ForEach-Object { $_.IsReadOnly = $false }"
+        platforms: [windows]
     status:
-      - test -d editor/src-tauri/runtime/jre
+      - test -f runtime/jre/release
 
   jlink:clean:
     desc: "Remove JLink runtime and bundled JARs"

LICENSE

@@ -10,6 +10,10 @@ if that directory exists, is licensed under the license defined in "app/propriet
 if that directory exists, is licensed under the license defined in "app/saas/LICENSE".
 * All content that resides under the "engine/" directory of this repository,
 if that directory exists, is licensed under the license defined in "engine/LICENSE".
+* "scripts/pymupdf_convert.py", if that file exists, is licensed under the GNU Affero
+General Public License v3.0 (or later) as declared in its file header. It is a separate
+program invoked as an OS subprocess; its license does not extend to other content in
+this repository.
 * All content that resides under the "frontend/src/proprietary/" directory of this repository,
 if that directory exists, is licensed under the license defined in "frontend/src/proprietary/LICENSE".
 * All content that resides under the "frontend/src/desktop/" directory of this repository,

Taskfile.yml

@@ -58,6 +58,23 @@ tasks:
           BACKEND_URL: 'http://localhost:{{.BACKEND_PORT}}'
           OPEN: "true"
 
+  dev:saas:
+    desc: "Start SaaS backend + frontend concurrently on free ports"
+    vars:
+      PORTS:
+        sh: '{{if eq OS "windows"}}{{.FIND_FREE_PORT_PS}} 8080 5173{{else}}{{.FIND_FREE_PORT_SH}} 8080 5173{{end}}'
+      BACKEND_PORT: '{{index (splitList "\n" .PORTS) 0}}'
+      FRONTEND_PORT: '{{index (splitList "\n" .PORTS) 1}}'
+    deps:
+      - task: backend:dev:saas
+        vars:
+          PORT: '{{.BACKEND_PORT}}'
+      - task: frontend:dev:saas
+        vars:
+          PORT: '{{.FRONTEND_PORT}}'
+          BACKEND_URL: 'http://localhost:{{.BACKEND_PORT}}'
+          OPEN: "true"
+
   dev:all:
     desc: "Start backend + frontend + engine concurrently on free ports"
     vars:
@@ -74,7 +91,7 @@ tasks:
         vars:
           PORT: '{{.BACKEND_PORT}}'
           AIENGINE_URL: 'http://localhost:{{.ENGINE_PORT}}'
-      - task: frontend:dev:prototypes
+      - task: frontend:dev
         vars:
           PORT: '{{.FRONTEND_PORT}}'
           BACKEND_URL: 'http://localhost:{{.BACKEND_PORT}}'

app/.env.saas

@@ -1,20 +1,20 @@
 ###############################################################################
-# Stirling-PDF SaaS local environment template.
+# Stirling-PDF SaaS environment defaults.
 #
-# Copy this file to `.env.saas.local` (gitignored) and fill in real values.
-# Loaded by `task backend:dev:saas` via Taskfile's `dotenv:` directive, then
-# read by Spring Boot's `${...}` placeholders in application-saas.properties
-# and application-dev.properties.
+# This file is committed and provides non-secret defaults loaded by
+# `task backend:dev:saas`. Put real values for secrets (passwords, project
+# refs, edge function secrets) in `.env.saas.local` - any variable set there
+# takes precedence over what's defined here.
 #
-# DO NOT commit `.env.saas.local`. Only `.env.saas.example` is checked in.
+# DO NOT commit `.env.saas.local`. Only `.env.saas` is checked in.
 ###############################################################################
 
 # ---------- Supabase project ----------
 # Project reference (the subdomain part of <ref>.supabase.co). Required.
-# Example dev project:
+# Set in .env.saas.local.
 SAAS_DB_PROJECT_REF=
 
-# Edge function secret used by billing/license rollup calls.
+# Edge function secret used by billing/license rollup calls. Set in .env.saas.local.
 SUPABASE_EDGE_FUNCTION_SECRET=
 
 # ---------- Database (saas profile) ----------
@@ -28,7 +28,7 @@ SAAS_DB_PASSWORD=
 # ---------- Database (dev profile overrides) ----------
 # Used when `--spring.profiles.include=dev` is active. The dev profile
 # defaults the URL/username to the shared dev Supabase project, but the
-# password must still be provided here.
+# password must still be provided in .env.saas.local.
 SAAS_DEV_DB_URL=
 SAAS_DEV_DB_USERNAME=postgres
 SAAS_DEV_DB_PASSWORD=

app/.gitignore

@@ -0,0 +1,3 @@
+# Whitelist committed env defaults. `.env.saas.local` (and any other .env*)
+# stays ignored via the root .gitignore.
+!.env.saas

app/allowed-licenses.json

@@ -44,6 +44,10 @@
       "moduleName": ".*",
       "moduleLicense": "The MIT License"
     },
+    {
+      "moduleName": ".*",
+      "moduleLicense": "MIT-0"
+    },
     {
       "moduleName": "com.github.jai-imageio:jai-imageio-core",
       "moduleLicense": "LICENSE.txt"

app/common/src/main/java/stirling/software/common/annotations/AutoJobPostMapping.java

@@ -77,6 +77,10 @@ public @interface AutoJobPostMapping {
     /**
      * Relative resource weight (1-100). See {@link
      * stirling.software.common.enumeration.ResourceWeight} for the standard tiers.
+     *
+     * <p>The default is a sentinel ({@link Integer#MIN_VALUE}); {@code
+     * AutoJobPostMappingWeightTest} fails the build if any endpoint leaves it unset. Runtime
+     * readers clamp the value into {@code [1, 100]}.
      */
-    int resourceWeight() default 1;
+    int resourceWeight() default Integer.MIN_VALUE;
 }

app/common/src/main/java/stirling/software/common/configuration/ConfigInitializer.java

@@ -80,6 +80,7 @@ public class ConfigInitializer {
             YamlHelper settingsFile = new YamlHelper(settingTempPath);
 
             migrateEnterpriseEditionToPremium(settingsFile, settingsTemplateFile);
+            migrateProFeaturesKeyCasing(settingsFile, settingsTemplateFile);
 
             boolean changesMade =
                     settingsTemplateFile.updateValuesFromYaml(settingsFile, settingsTemplateFile);
@@ -116,31 +117,52 @@ public class ConfigInitializer {
         }
         if (yaml.getValueByExactKeyPath("enterpriseEdition", "SSOAutoLogin") != null) {
             template.updateValue(
-                    List.of("premium", "proFeatures", "SSOAutoLogin"),
+                    List.of("premium", "proFeatures", "ssoAutoLogin"),
                     yaml.getValueByExactKeyPath("enterpriseEdition", "SSOAutoLogin"));
         }
         if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "autoUpdateMetadata")
                 != null) {
             template.updateValue(
-                    List.of("premium", "proFeatures", "CustomMetadata", "autoUpdateMetadata"),
+                    List.of("premium", "proFeatures", "customMetadata", "autoUpdateMetadata"),
                     yaml.getValueByExactKeyPath(
                             "enterpriseEdition", "CustomMetadata", "autoUpdateMetadata"));
         }
         if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "author") != null) {
             template.updateValue(
-                    List.of("premium", "proFeatures", "CustomMetadata", "author"),
+                    List.of("premium", "proFeatures", "customMetadata", "author"),
                     yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "author"));
         }
         if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "creator") != null) {
             template.updateValue(
-                    List.of("premium", "proFeatures", "CustomMetadata", "creator"),
+                    List.of("premium", "proFeatures", "customMetadata", "creator"),
                     yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "creator"));
         }
         if (yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "producer")
                 != null) {
             template.updateValue(
-                    List.of("premium", "proFeatures", "CustomMetadata", "producer"),
+                    List.of("premium", "proFeatures", "customMetadata", "producer"),
                     yaml.getValueByExactKeyPath("enterpriseEdition", "CustomMetadata", "producer"));
         }
     }
+
+    // TODO: Remove post migration
+    // settings.yml.template renamed the two non-camelCase proFeatures keys
+    // ("SSOAutoLogin" -> "ssoAutoLogin", "CustomMetadata" -> "customMetadata") so the whole
+    // settings pipeline is consistent camelCase. The save path (YamlHelper.updateValue) matches
+    // keys case-sensitively, so without this carry-forward an existing install's values written
+    // under the old PascalCase keys would be dropped on upgrade and reset to template defaults.
+    void migrateProFeaturesKeyCasing(YamlHelper yaml, YamlHelper template) {
+        Object ssoAutoLogin = yaml.getValueByExactKeyPath("premium", "proFeatures", "SSOAutoLogin");
+        if (ssoAutoLogin != null) {
+            template.updateValue(List.of("premium", "proFeatures", "ssoAutoLogin"), ssoAutoLogin);
+        }
+        for (String field : List.of("autoUpdateMetadata", "author", "creator", "producer")) {
+            Object value =
+                    yaml.getValueByExactKeyPath("premium", "proFeatures", "CustomMetadata", field);
+            if (value != null) {
+                template.updateValue(
+                        List.of("premium", "proFeatures", "customMetadata", field), value);
+            }
+        }
+    }
 }

app/common/src/main/java/stirling/software/common/model/ApplicationProperties.java

@@ -528,6 +528,16 @@ public class ApplicationProperties {
             private String provider;
             private Client client = new Client();
 
+            /**
+             * When true, the OAuth2/OIDC login flow logs the full set of ID token and UserInfo
+             * claims at INFO level (and again at ERROR level if the username attribute cannot be
+             * resolved). Used to diagnose provider misconfiguration (for example ADFS not returning
+             * an {@code email} claim). WARNING: writes PII (sub, email, name) to application logs.
+             * Leave disabled in production; enable only while actively troubleshooting and disable
+             * again afterwards.
+             */
+            private Boolean debugLogging = false;
+
             public void setScopes(String scopes) {
                 List<String> scopesList =
                         Arrays.stream(scopes.split(",")).map(String::trim).toList();
@@ -778,6 +788,7 @@ public class ApplicationProperties {
         private boolean enabled = false;
         private String provider = "local";
         private Local local = new Local();
+        private S3 s3 = new S3();
         private Quotas quotas = new Quotas();
         private Sharing sharing = new Sharing();
         private Signing signing = new Signing();
@@ -787,6 +798,57 @@ public class ApplicationProperties {
             private String basePath = InstallationPathConfig.getPath() + "storage";
         }
 
+        @Data
+        public static class S3 {
+            /**
+             * Optional custom endpoint (e.g. {@code https://<account>.r2.cloudflarestorage.com},
+             * {@code https://<project>.supabase.co/storage/v1/s3}, or {@code http://localhost:9000}
+             * for MinIO). Blank = use AWS regional default.
+             */
+            private String endpoint = "";
+
+            private String bucket = "";
+
+            private String region = "us-east-1";
+
+            private String accessKey = "";
+            private String secretKey = "";
+
+            /**
+             * When {@code true} use path-style URLs ({@code <endpoint>/<bucket>/<key>}) instead of
+             * virtual-hosted ({@code <bucket>.<endpoint>/<key>}). MinIO and most S3-compatible
+             * gateways require path-style; AWS S3 prefers virtual-hosted.
+             */
+            private boolean pathStyleAccess = false;
+
+            /**
+             * When {@code false} (default), {@code endpoint} hostnames that resolve to private,
+             * loopback, or link-local addresses are rejected at startup to block SSRF attacks via
+             * the cloud metadata service (e.g. {@code http://169.254.169.254/}). Set to {@code
+             * true} to opt in for MinIO / in-cluster S3 endpoints on private networks.
+             */
+            private boolean allowPrivateEndpoints = false;
+
+            /**
+             * Controls when the SDK adds an {@code x-amz-checksum-*} header on PUT/UploadPart.
+             * Default {@code WHEN_SUPPORTED} (the SDK default since 2.30) makes the SDK send a
+             * CRC32 checksum on every upload - this works on AWS S3, MinIO, current Supabase,
+             * Backblaze B2 (post-July-2025), and modern R2. Set to {@code WHEN_REQUIRED} to
+             * suppress the auto-checksum on vendors that reject unknown {@code x-amz-checksum-*}
+             * headers (older Backblaze B2, some R2 corner cases, GCS S3 endpoint). Invalid values
+             * fall back to {@code WHEN_SUPPORTED}.
+             */
+            private String requestChecksumCalculation = "WHEN_SUPPORTED";
+
+            /**
+             * Controls when the SDK validates returned {@code x-amz-checksum-*} headers on GET
+             * responses. Default {@code WHEN_SUPPORTED}. Set to {@code WHEN_REQUIRED} if your
+             * vendor never returns these headers and you see false-positive checksum-mismatch
+             * errors. Invalid values fall back to {@code WHEN_SUPPORTED}.
+             */
+            private String responseChecksumValidation = "WHEN_SUPPORTED";
+        }
+
         @Data
         public static class Sharing {
             private boolean enabled = false;
@@ -1288,6 +1350,10 @@ public class ApplicationProperties {
             public int getFfmpegSessionLimit() {
                 return ffmpegSessionLimit > 0 ? ffmpegSessionLimit : 2;
             }
+
+            public int getPyMuPdfConvertSessionLimit() {
+                return 2;
+            }
         }
 
         @Data
@@ -1365,6 +1431,10 @@ public class ApplicationProperties {
             public long getFfmpegTimeoutMinutes() {
                 return ffmpegTimeoutMinutes > 0 ? ffmpegTimeoutMinutes : 30;
             }
+
+            public long getPyMuPdfConvertTimeoutMinutes() {
+                return 10;
+            }
         }
     }
 }

app/common/src/main/java/stirling/software/common/service/PyMuPdfConverter.java

@@ -0,0 +1,91 @@
+package stirling.software.common.service;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Locale;
+import java.util.concurrent.TimeUnit;
+
+import org.springframework.stereotype.Service;
+
+import jakarta.annotation.PostConstruct;
+
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.util.ProcessExecutor;
+
+/**
+ * Converts PDFs to Markdown by invoking the {@code pymupdf-convert} CLI tool as a separate
+ * subprocess.
+ */
+@Slf4j
+@Service
+public class PyMuPdfConverter {
+
+    private boolean available;
+
+    @PostConstruct
+    void init() {
+        available = probe();
+        if (available) {
+            log.info("pymupdf-convert found — PyMuPDF Markdown conversion enabled.");
+        } else {
+            log.info("pymupdf-convert not found — PyMuPDF Markdown conversion disabled.");
+        }
+    }
+
+    public boolean isAvailable() {
+        return available;
+    }
+
+    private boolean probe() {
+        boolean isWindows =
+                System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("windows");
+        List<String> cmd =
+                isWindows
+                        ? List.of("where", "pymupdf-convert")
+                        : List.of("which", "pymupdf-convert");
+        try {
+            Process p = new ProcessBuilder(cmd).redirectErrorStream(true).start();
+            boolean done = p.waitFor(5, TimeUnit.SECONDS);
+            return done && p.exitValue() == 0;
+        } catch (Exception e) {
+            log.debug("pymupdf-convert availability check failed: {}", e.getMessage());
+            return false;
+        }
+    }
+
+    /**
+     * Convert a PDF to Markdown by invoking {@code pymupdf-convert} as a subprocess.
+     *
+     * @throws IOException on process failure or if the tool is not installed
+     */
+    public String convertToMarkdown(byte[] pdfBytes, String filename) throws IOException {
+        String safeName =
+                (filename == null || filename.isBlank())
+                        ? "document.pdf"
+                        : filename.replace("\"", "");
+        Path tempDir = Files.createTempDirectory("stirling-pymupdf-");
+        Path inputPdf = tempDir.resolve(safeName);
+        Path outputMd = tempDir.resolve("output.md");
+        try {
+            Files.write(inputPdf, pdfBytes);
+            ProcessExecutor.getInstance(ProcessExecutor.Processes.PYMUPDF_CONVERT)
+                    .runCommandWithOutputHandling(
+                            List.of(
+                                    "pymupdf-convert",
+                                    inputPdf.toAbsolutePath().toString(),
+                                    outputMd.toAbsolutePath().toString()));
+            return Files.readString(outputMd, StandardCharsets.UTF_8);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new IOException("PyMuPDF conversion interrupted", e);
+        } finally {
+            Files.deleteIfExists(inputPdf);
+            Files.deleteIfExists(outputMd);
+            Files.deleteIfExists(tempDir);
+        }
+    }
+}

app/common/src/main/java/stirling/software/common/util/PDFToFile.java

@@ -4,6 +4,7 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
@@ -30,6 +31,7 @@ import io.github.pixee.security.Filenames;
 import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.common.configuration.RuntimePathConfig;
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.util.ProcessExecutor.ProcessExecutorResult;
 
 @Slf4j
@@ -159,6 +161,57 @@ public class PDFToFile {
                 finalOut, fileName, MediaType.APPLICATION_OCTET_STREAM);
     }
 
+    /**
+     * PDF->Markdown with optional PyMuPDF acceleration.
+     *
+     * <p>When {@code pymupdf-convert} is installed and on PATH, conversion is delegated to it as a
+     * subprocess. On any failure — or when the tool is absent — this transparently falls back to
+     * the bundled {@code pdftohtml}-based converter.
+     */
+    public ResponseEntity<Resource> processPdfToMarkdown(
+            MultipartFile inputFile, PyMuPdfConverter pyMuPdfConverter)
+            throws IOException, InterruptedException {
+        if (!MediaType.APPLICATION_PDF_VALUE.equals(inputFile.getContentType())) {
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+        }
+
+        if (pyMuPdfConverter != null && pyMuPdfConverter.isAvailable()) {
+            try {
+                String originalName = Filenames.toSimpleFileName(inputFile.getOriginalFilename());
+                String baseName = originalName;
+                if (originalName != null && originalName.contains(".")) {
+                    baseName = originalName.substring(0, originalName.lastIndexOf('.'));
+                }
+                String markdown =
+                        pyMuPdfConverter.convertToMarkdown(inputFile.getBytes(), originalName);
+                return buildMarkdownZipResponse(markdown, baseName);
+            } catch (IOException e) {
+                log.warn(
+                        "PyMuPDF conversion failed; falling back to pdftohtml converter: {}",
+                        e.getMessage());
+            }
+        }
+        return processPdfToMarkdown(inputFile);
+    }
+
+    private ResponseEntity<Resource> buildMarkdownZipResponse(String markdown, String pdfBaseName)
+            throws IOException {
+        String fileName = pdfBaseName + "ToMarkdown.zip";
+        TempFile finalOut = tempFileManager.createManagedTempFile(".zip");
+        try (OutputStream fos = Files.newOutputStream(finalOut.getPath());
+                ZipOutputStream zipOutputStream = new ZipOutputStream(fos)) {
+            ZipEntry mdEntry = new ZipEntry(pdfBaseName + ".md");
+            zipOutputStream.putNextEntry(mdEntry);
+            zipOutputStream.write(markdown.getBytes(StandardCharsets.UTF_8));
+            zipOutputStream.closeEntry();
+        } catch (Exception e) {
+            finalOut.close();
+            throw e;
+        }
+        return WebResponseUtils.fileToWebResponse(
+                finalOut, fileName, MediaType.APPLICATION_OCTET_STREAM);
+    }
+
     /**
      * Updates image references in markdown to point to the images/ folder. Matches patterns like
      * ![alt](filename.png) and converts to ![alt](images/filename.png)

app/common/src/main/java/stirling/software/common/util/ProcessExecutor.java

@@ -115,6 +115,11 @@ public class ProcessExecutor {
                                                 .getProcessExecutor()
                                                 .getSessionLimit()
                                                 .getFfmpegSessionLimit();
+                                case PYMUPDF_CONVERT ->
+                                        applicationProperties
+                                                .getProcessExecutor()
+                                                .getSessionLimit()
+                                                .getPyMuPdfConvertSessionLimit();
                             };
 
                     long timeoutMinutes =
@@ -180,6 +185,11 @@ public class ProcessExecutor {
                                                 .getProcessExecutor()
                                                 .getTimeoutMinutes()
                                                 .getFfmpegTimeoutMinutes();
+                                case PYMUPDF_CONVERT ->
+                                        applicationProperties
+                                                .getProcessExecutor()
+                                                .getTimeoutMinutes()
+                                                .getPyMuPdfConvertTimeoutMinutes();
                             };
                     return new ProcessExecutor(
                             processType, semaphoreLimit, liveUpdates, timeoutMinutes);
@@ -550,7 +560,8 @@ public class ProcessExecutor {
         GHOSTSCRIPT,
         OCR_MY_PDF,
         CFF_CONVERTER,
-        FFMPEG
+        FFMPEG,
+        PYMUPDF_CONVERT
     }
 
     @Setter

app/common/src/main/java/stirling/software/common/util/RequestUriUtils.java

@@ -83,7 +83,16 @@ public class RequestUriUtils {
             return false;
         }
 
-        // Blocklist of backend/non-frontend paths that should still go through filters
+        // Blocklist of backend/non-frontend paths that should still go through filters.
+        //
+        // `/files` was historically a backend route; it is now a frontend route
+        // owned by HomePage / FileManagerView. Direct-nav or refresh on /files
+        // (or /files/<folder-uuid>) was returning the Spring auth filter's 401
+        // JSON instead of serving index.html, so the SPA never got a chance to
+        // mount and the user saw a raw error response. There are no `/files`
+        // backend mappings at the servlet root - the real storage endpoints
+        // live under `/api/v1/storage/files`, which is filtered out a few lines
+        // up by the `startsWith("/api/")` guard.
         String[] backendOnlyPrefixes = {
             "/register",
             "/pipeline",
@@ -91,7 +100,6 @@ public class RequestUriUtils {
             "/pdfjs-legacy",
             "/fonts",
             "/images",
-            "/files",
             "/css",
             "/js",
             "/swagger",
@@ -181,7 +189,7 @@ public class RequestUriUtils {
                 || trimmedUri.startsWith(
                         "/api/v1/mobile-scanner/") // Mobile scanner endpoints (no auth)
                 || trimmedUri.startsWith("/v1/api-docs")
-                // Workflow participant endpoints — access controlled by share tokens, not login
+                // Workflow participant endpoints - access controlled by share tokens, not login
                 || trimmedUri.startsWith("/api/v1/workflow/participant/")
                 // Share-link SPA bootstrap; data APIs remain protected
                 || trimmedUri.matches("^/share/[^/]+/?$");

app/common/src/test/java/stirling/software/common/configuration/ConfigInitializerTest.java

@@ -0,0 +1,95 @@
+package stirling.software.common.configuration;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.snakeyaml.engine.v2.api.LoadSettings;
+
+import stirling.software.common.util.YamlHelper;
+
+class ConfigInitializerTest {
+
+    private static final LoadSettings LOAD_SETTINGS =
+            LoadSettings.builder()
+                    .setUseMarks(true)
+                    .setMaxAliasesForCollections(Integer.MAX_VALUE)
+                    .setAllowRecursiveKeys(true)
+                    .setParseComments(true)
+                    .build();
+
+    // Mirrors the proFeatures block of settings.yml.template after the camelCase rename.
+    private static final String CAMEL_CASE_TEMPLATE =
+            """
+            premium:
+              proFeatures:
+                ssoAutoLogin: false
+                customMetadata:
+                  autoUpdateMetadata: false
+                  author: username
+                  creator: Stirling-PDF
+                  producer: Stirling-PDF
+            """;
+
+    @Test
+    void migrateProFeaturesKeyCasing_carriesForwardLegacyPascalCaseValues() {
+        // An existing install whose settings.yml still uses the old PascalCase keys.
+        String legacy =
+                """
+                premium:
+                  proFeatures:
+                    SSOAutoLogin: true
+                    CustomMetadata:
+                      autoUpdateMetadata: true
+                      author: alice
+                      creator: bob
+                      producer: carol
+                """;
+        YamlHelper template = new YamlHelper(LOAD_SETTINGS, CAMEL_CASE_TEMPLATE);
+        YamlHelper existing = new YamlHelper(LOAD_SETTINGS, legacy);
+
+        new ConfigInitializer().migrateProFeaturesKeyCasing(existing, template);
+
+        assertEquals(
+                "true", template.getValueByExactKeyPath("premium", "proFeatures", "ssoAutoLogin"));
+        assertEquals(
+                "true",
+                template.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "autoUpdateMetadata"));
+        assertEquals(
+                "alice",
+                template.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "author"));
+        assertEquals(
+                "bob",
+                template.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "creator"));
+        assertEquals(
+                "carol",
+                template.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "producer"));
+    }
+
+    @Test
+    void migrateProFeaturesKeyCasing_withoutLegacyKeys_keepsTemplateDefaults() {
+        // No PascalCase keys present -> this migration step must be a no-op.
+        String alreadyCamel =
+                """
+                premium:
+                  proFeatures:
+                    ssoAutoLogin: true
+                    customMetadata:
+                      author: dave
+                """;
+        YamlHelper template = new YamlHelper(LOAD_SETTINGS, CAMEL_CASE_TEMPLATE);
+        YamlHelper existing = new YamlHelper(LOAD_SETTINGS, alreadyCamel);
+
+        new ConfigInitializer().migrateProFeaturesKeyCasing(existing, template);
+
+        assertEquals(
+                "false", template.getValueByExactKeyPath("premium", "proFeatures", "ssoAutoLogin"));
+        assertEquals(
+                "username",
+                template.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "author"));
+    }
+}

app/common/src/test/java/stirling/software/common/util/GeneralUtilsTest.java

@@ -2,6 +2,8 @@ package stirling.software.common.util;
 
 import static org.junit.jupiter.api.Assertions.*;
 
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -12,9 +14,47 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+
+import stirling.software.common.configuration.InstallationPathConfig;
 
 public class GeneralUtilsTest {
 
+    // Regression guard for the SSO auto-login persistence bug: the admin UI writes camelCase
+    // proFeatures keys, so saveKeyToSettings must match (and persist) them against the camelCase
+    // settings.yml.template. A case mismatch makes YamlHelper.updateValue silently no-op.
+    @Test
+    void saveKeyToSettings_persistsCamelCaseProFeatureKeys(@TempDir Path tempDir) throws Exception {
+        Path settings = tempDir.resolve("settings.yml");
+        Files.writeString(
+                settings,
+                """
+                premium:
+                  proFeatures:
+                    ssoAutoLogin: false
+                    customMetadata:
+                      author: username
+                """);
+
+        try (MockedStatic<InstallationPathConfig> mocked =
+                Mockito.mockStatic(InstallationPathConfig.class)) {
+            mocked.when(InstallationPathConfig::getSettingsPath).thenReturn(settings.toString());
+
+            GeneralUtils.saveKeyToSettings("premium.proFeatures.ssoAutoLogin", true);
+            GeneralUtils.saveKeyToSettings("premium.proFeatures.customMetadata.author", "alice");
+        }
+
+        YamlHelper reloaded = new YamlHelper(settings);
+        assertEquals(
+                "true", reloaded.getValueByExactKeyPath("premium", "proFeatures", "ssoAutoLogin"));
+        assertEquals(
+                "alice",
+                reloaded.getValueByExactKeyPath(
+                        "premium", "proFeatures", "customMetadata", "author"));
+    }
+
     @Test
     void testParsePageListWithAll() {
         List<Integer> result = GeneralUtils.parsePageList(new String[] {"all"}, 5, false);

app/common/src/test/java/stirling/software/common/util/RequestUriUtilsTest.java

@@ -98,6 +98,17 @@ class RequestUriUtilsTest {
         assertTrue(RequestUriUtils.isFrontendRoute("", "/split-pdf"));
     }
 
+    @Test
+    void testIsFrontendRoute_filesRouteOwnedByFrontend() {
+        // /files and /files/<folder-uuid> are FileManagerView routes - they
+        // must fall through to the SPA index.html, not get blocked by the
+        // backend auth filter. Regression test for direct-nav/refresh on
+        // the file manager returning a 401 JSON.
+        assertTrue(RequestUriUtils.isFrontendRoute("", "/files"));
+        assertTrue(
+                RequestUriUtils.isFrontendRoute("", "/files/3331910a-4155-4f71-8111-e38c896bc458"));
+    }
+
     @Test
     void testIsFrontendRoute_pathWithExtension() {
         assertFalse(RequestUriUtils.isFrontendRoute("", "/some/file.pdf"));
@@ -183,7 +194,7 @@ class RequestUriUtilsTest {
 
     @Test
     void testIsPublicAuthEndpoint_shareRootNotPublic() {
-        // Avoid matching bare "/share" or "/share/" — must have a token segment
+        // Avoid matching bare "/share" or "/share/" - must have a token segment
         assertFalse(RequestUriUtils.isPublicAuthEndpoint("/share", ""));
         assertFalse(RequestUriUtils.isPublicAuthEndpoint("/share/", ""));
     }
@@ -197,7 +208,7 @@ class RequestUriUtilsTest {
 
     @Test
     void testIsPublicAuthEndpoint_shareApiStillProtected() {
-        // Share-link data APIs must NOT be public — they enforce auth + access checks
+        // Share-link data APIs must NOT be public - they enforce auth + access checks
         assertFalse(RequestUriUtils.isPublicAuthEndpoint("/api/v1/storage/share-links/abc123", ""));
         assertFalse(
                 RequestUriUtils.isPublicAuthEndpoint(

app/core/src/main/java/stirling/software/SPDF/config/EndpointInterceptor.java

@@ -21,6 +21,13 @@ public class EndpointInterceptor implements HandlerInterceptor {
             HttpServletRequest request, HttpServletResponse response, Object handler)
             throws Exception {
         String requestURI = request.getRequestURI();
+
+        // Prevent API responses from being stored by browsers or intermediary caches by default
+        String servletPath = request.getServletPath();
+        if (servletPath != null && servletPath.startsWith("/api/")) {
+            response.setHeader("Cache-Control", "private, no-store");
+        }
+
         boolean isEnabled = endpointConfiguration.isEndpointEnabledForUri(requestURI);
         if (!isEnabled) {
             response.sendError(HttpServletResponse.SC_FORBIDDEN, "This endpoint is disabled");

app/core/src/main/java/stirling/software/SPDF/config/ExternalAppDepConfig.java

@@ -101,6 +101,9 @@ public class ExternalAppDepConfig {
             // Python / OpenCV special handling
             checkPythonAndOpenCV();
 
+            // PyMuPDF optional acceleration
+            checkPyMuPdf();
+
             dependenciesChecked = true;
         } finally {
             endpointConfiguration.logDisabledEndpointsSummary();
@@ -236,6 +239,15 @@ public class ExternalAppDepConfig {
         }
     }
 
+    private void checkPyMuPdf() {
+        if (isCommandAvailable("pymupdf-convert")) {
+            log.warn("pymupdf-convert detected — PDF->Markdown will use PyMuPDF acceleration.");
+        } else {
+            log.info(
+                    "pymupdf-convert not found — PDF->Markdown will use the bundled pdftohtml converter.");
+        }
+    }
+
     private void disablePythonAndOpenCV(String reason) {
         List<String> pythonFeatures = getAffectedFeatures("Python");
         List<String> openCVFeatures = getAffectedFeatures("OpenCV");

app/core/src/main/java/stirling/software/SPDF/config/WebMvcConfig.java

@@ -1,5 +1,8 @@
 package stirling.software.SPDF.config;
 
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import org.slf4j.Logger;
@@ -24,6 +27,10 @@ public class WebMvcConfig implements WebMvcConfigurer {
 
     private static final Logger logger = LoggerFactory.getLogger(WebMvcConfig.class);
 
+    private static final CacheControl NO_CACHE = CacheControl.noCache();
+    private static final CacheControl IMMUTABLE_ONE_YEAR =
+            CacheControl.maxAge(365, TimeUnit.DAYS).cachePublic().immutable();
+
     @Override
     public void addInterceptors(InterceptorRegistry registry) {
         registry.addInterceptor(endpointInterceptor);
@@ -31,37 +38,95 @@ public class WebMvcConfig implements WebMvcConfigurer {
 
     @Override
     public void addResourceHandlers(ResourceHandlerRegistry registry) {
-        // Cache hashed assets (JS/CSS with content hashes) for 1 year
-        // These files have names like index-ChAS4tCC.js that change when content changes
-        // Check customFiles/static first, then fall back to classpath
+        String staticPath =
+                "file:"
+                        + stirling.software.common.configuration.InstallationPathConfig
+                                .getStaticPath();
+
+        // 1. Service worker and PWA metadata (never store)
+        // Browsers revalidate SW bytes anyway; no-store is the safest for atomic updates.
+        registry.addResourceHandler(
+                        "/sw.js", "/manifest.json", "/site.webmanifest", "/browserconfig.xml")
+                .addResourceLocations(staticPath, "classpath:/static/")
+                .setCacheControl(CacheControl.noStore())
+                .resourceChain(true);
+
+        // 2. Vite fingerprinted assets (immutable)
+        // These already have content hashes in filenames (e.g. index-ChAS4tCC.js)
         registry.addResourceHandler("/assets/**")
-                .addResourceLocations(
-                        "file:"
-                                + stirling.software.common.configuration.InstallationPathConfig
-                                        .getStaticPath()
-                                + "assets/",
-                        "classpath:/static/assets/")
-                .setCacheControl(CacheControl.maxAge(365, TimeUnit.DAYS).cachePublic());
+                .addResourceLocations(staticPath + "assets/", "classpath:/static/assets/")
+                .setCacheControl(IMMUTABLE_ONE_YEAR)
+                .resourceChain(true);
 
-        // Don't cache index.html - it needs to be fresh to reference latest hashed assets
-        // Note: index.html is handled by ReactRoutingController for dynamic processing
-        registry.addResourceHandler("/index.html")
+        // 3. Media and fonts (immutable)
+        registry.addResourceHandler("/images/**", "/fonts/**")
                 .addResourceLocations(
-                        "file:"
-                                + stirling.software.common.configuration.InstallationPathConfig
-                                        .getStaticPath(),
-                        "classpath:/static/")
-                .setCacheControl(CacheControl.noCache().mustRevalidate());
+                        staticPath + "images/",
+                        "classpath:/static/images/",
+                        staticPath + "fonts/",
+                        "classpath:/static/fonts/")
+                .setCacheControl(IMMUTABLE_ONE_YEAR)
+                .resourceChain(true);
 
-        // Handle all other static resources (js, css, images, fonts, etc.)
-        // Check customFiles/static first for user overrides
+        // 4. Branding and stable non-fingerprinted assets (1 day + SWR)
+        // Use stale-while-revalidate to improve perceived performance.
+        registry.addResourceHandler(
+                        "/favicon.*",
+                        "/apple-touch-icon.png",
+                        "/android-chrome-*.png",
+                        "/mstile-*.png",
+                        "/safari-pinned-tab.svg",
+                        "/icons/**",
+                        "/modern-logo/**",
+                        "/classic-logo/**",
+                        "/robots.txt",
+                        "/3rdPartyLicenses.json",
+                        "/pdfjs/**",
+                        "/pdfjs-legacy/**",
+                        "/pdfium/**",
+                        "/locales/**",
+                        "/css/**",
+                        "/js/**",
+                        "/vendor/**",
+                        "/samples/**",
+                        "/og_images/**",
+                        "/Login/**",
+                        "/manifest-classic.json")
+                .addResourceLocations(
+                        staticPath,
+                        "classpath:/static/",
+                        staticPath + "pdfjs/",
+                        "classpath:/static/pdfjs/",
+                        staticPath + "pdfjs-legacy/",
+                        "classpath:/static/pdfjs-legacy/",
+                        staticPath + "pdfium/",
+                        "classpath:/static/pdfium/",
+                        staticPath + "locales/",
+                        "classpath:/static/locales/",
+                        staticPath + "css/",
+                        "classpath:/static/css/",
+                        staticPath + "js/",
+                        "classpath:/static/js/",
+                        staticPath + "vendor/",
+                        "classpath:/static/vendor/",
+                        staticPath + "samples/",
+                        "classpath:/static/samples/",
+                        staticPath + "og_images/",
+                        "classpath:/static/og_images/",
+                        staticPath + "Login/",
+                        "classpath:/static/Login/")
+                .setCacheControl(
+                        CacheControl.maxAge(Duration.ofDays(1))
+                                .cachePublic()
+                                .staleWhileRevalidate(Duration.ofDays(7)))
+                .resourceChain(true);
+
+        // 5. Catch-all (SPA fallback)
+        // Must check with server to ensure index.html is always fresh.
         registry.addResourceHandler("/**")
-                .addResourceLocations(
-                        "file:"
-                                + stirling.software.common.configuration.InstallationPathConfig
-                                        .getStaticPath(),
-                        "classpath:/static/")
-                .setCacheControl(CacheControl.maxAge(1, TimeUnit.HOURS));
+                .addResourceLocations(staticPath, "classpath:/static/")
+                .setCacheControl(NO_CACHE)
+                .resourceChain(true);
     }
 
     @Override
@@ -115,9 +180,8 @@ public class WebMvcConfig implements WebMvcConfigurer {
                     applicationProperties.getSystem().getCorsAllowedOrigins());
 
             // Combine user-configured origins with Tauri origins
-            java.util.List<String> allOrigins =
-                    new java.util.ArrayList<>(
-                            applicationProperties.getSystem().getCorsAllowedOrigins());
+            List<String> allOrigins =
+                    new ArrayList<>(applicationProperties.getSystem().getCorsAllowedOrigins());
 
             // Always include Tauri origins for desktop app compatibility
             // Tauri v1 uses tauri://localhost, v2 uses http(s)://tauri.localhost
@@ -158,7 +222,8 @@ public class WebMvcConfig implements WebMvcConfigurer {
         } else {
             // Default to allowing all origins when nothing is configured
             logger.debug(
-                    "No CORS allowed origins configured in settings.yml (system.corsAllowedOrigins); WebMvcConfig allowing all origins.");
+                    "No CORS allowed origins configured in settings.yml"
+                            + " (system.corsAllowedOrigins); WebMvcConfig allowing all origins.");
             registry.addMapping("/**")
                     .allowedOriginPatterns("*")
                     .allowedMethods("GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS")

app/core/src/main/java/stirling/software/SPDF/controller/api/EditTextController.java

@@ -32,6 +32,7 @@ import stirling.software.SPDF.model.json.PdfJsonTextElement;
 import stirling.software.SPDF.service.PdfJsonConversionService;
 import stirling.software.common.annotations.AutoJobPostMapping;
 import stirling.software.common.annotations.api.GeneralApi;
+import stirling.software.common.enumeration.ResourceWeight;
 import stirling.software.common.model.api.general.EditTextOperation;
 import stirling.software.common.util.ExceptionUtils;
 import stirling.software.common.util.GeneralUtils;
@@ -75,7 +76,10 @@ public class EditTextController {
                 new StringToArrayListPropertyEditor<>(EditTextOperation.class));
     }
 
-    @AutoJobPostMapping(consumes = "multipart/form-data", value = "/edit-text")
+    @AutoJobPostMapping(
+            consumes = "multipart/form-data",
+            value = "/edit-text",
+            resourceWeight = ResourceWeight.LARGE_WEIGHT)
     @StandardPdfResponse
     @Operation(
             summary = "Edit text in a PDF via find and replace",

app/core/src/main/java/stirling/software/SPDF/controller/api/ScalePagesController.java

@@ -40,7 +40,8 @@ public class ScalePagesController {
     private final CustomPDFDocumentFactory pdfDocumentFactory;
     private final TempFileManager tempFileManager;
 
-    private static PDRectangle getTargetSize(String targetPDRectangle, PDDocument sourceDocument) {
+    private static PDRectangle getTargetSize(
+            String targetPDRectangle, String orientation, PDDocument sourceDocument) {
         if ("KEEP".equals(targetPDRectangle)) {
             if (sourceDocument.getNumberOfPages() == 0) {
                 throw ExceptionUtils.createInvalidPageSizeException("KEEP");
@@ -57,18 +58,19 @@ public class ScalePagesController {
         }
 
         Map<String, PDRectangle> sizeMap = getSizeMap();
-
-        if (sizeMap.containsKey(targetPDRectangle)) {
-            return sizeMap.get(targetPDRectangle);
+        PDRectangle base = sizeMap.get(targetPDRectangle);
+        if (base == null) {
+            throw ExceptionUtils.createInvalidPageSizeException(targetPDRectangle);
         }
 
-        throw ExceptionUtils.createInvalidPageSizeException(targetPDRectangle);
+        if ("LANDSCAPE".equalsIgnoreCase(orientation)) {
+            return new PDRectangle(base.getHeight(), base.getWidth());
+        }
+        return base;
     }
 
     private static Map<String, PDRectangle> getSizeMap() {
         Map<String, PDRectangle> sizeMap = new HashMap<>();
-
-        // Portrait sizes (A0-A6)
         sizeMap.put("A0", PDRectangle.A0);
         sizeMap.put("A1", PDRectangle.A1);
         sizeMap.put("A2", PDRectangle.A2);
@@ -76,42 +78,8 @@ public class ScalePagesController {
         sizeMap.put("A4", PDRectangle.A4);
         sizeMap.put("A5", PDRectangle.A5);
         sizeMap.put("A6", PDRectangle.A6);
-
-        // Landscape sizes (A0-A6)
-        sizeMap.put(
-                "A0_LANDSCAPE",
-                new PDRectangle(PDRectangle.A0.getHeight(), PDRectangle.A0.getWidth()));
-        sizeMap.put(
-                "A1_LANDSCAPE",
-                new PDRectangle(PDRectangle.A1.getHeight(), PDRectangle.A1.getWidth()));
-        sizeMap.put(
-                "A2_LANDSCAPE",
-                new PDRectangle(PDRectangle.A2.getHeight(), PDRectangle.A2.getWidth()));
-        sizeMap.put(
-                "A3_LANDSCAPE",
-                new PDRectangle(PDRectangle.A3.getHeight(), PDRectangle.A3.getWidth()));
-        sizeMap.put(
-                "A4_LANDSCAPE",
-                new PDRectangle(PDRectangle.A4.getHeight(), PDRectangle.A4.getWidth()));
-        sizeMap.put(
-                "A5_LANDSCAPE",
-                new PDRectangle(PDRectangle.A5.getHeight(), PDRectangle.A5.getWidth()));
-        sizeMap.put(
-                "A6_LANDSCAPE",
-                new PDRectangle(PDRectangle.A6.getHeight(), PDRectangle.A6.getWidth()));
-
-        // Portrait US sizes
         sizeMap.put("LETTER", PDRectangle.LETTER);
         sizeMap.put("LEGAL", PDRectangle.LEGAL);
-
-        // Landscape US sizes
-        sizeMap.put(
-                "LETTER_LANDSCAPE",
-                new PDRectangle(PDRectangle.LETTER.getHeight(), PDRectangle.LETTER.getWidth()));
-        sizeMap.put(
-                "LEGAL_LANDSCAPE",
-                new PDRectangle(PDRectangle.LEGAL.getHeight(), PDRectangle.LEGAL.getWidth()));
-
         return sizeMap;
     }
 
@@ -128,13 +96,14 @@ public class ScalePagesController {
             throws IOException {
         MultipartFile file = request.getFileInput();
         String targetPDRectangle = request.getPageSize();
+        String orientation = request.getOrientation();
         float scaleFactor = request.getScaleFactor();
 
         try (PDDocument sourceDocument = pdfDocumentFactory.load(file);
                 PDDocument outputDocument =
                         pdfDocumentFactory.createNewDocumentBasedOnOldDocument(sourceDocument)) {
 
-            PDRectangle targetSize = getTargetSize(targetPDRectangle, sourceDocument);
+            PDRectangle targetSize = getTargetSize(targetPDRectangle, orientation, sourceDocument);
 
             // Create LayerUtility once outside the loop for better performance
             LayerUtility layerUtility = new LayerUtility(outputDocument);

app/core/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertImgPDFController.java

@@ -275,7 +275,10 @@ public class ConvertImgPDFController {
                 GeneralUtils.generateFilename(file[0].getOriginalFilename(), "_converted.pdf"));
     }
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/cbz/pdf")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/cbz/pdf",
+            resourceWeight = ResourceWeight.MEDIUM_WEIGHT)
     @Operation(
             summary = "Convert CBZ comic book archive to PDF",
             description =
@@ -301,7 +304,10 @@ public class ConvertImgPDFController {
         return WebResponseUtils.pdfFileToWebResponse(pdfFile, filename);
     }
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/pdf/cbz")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/pdf/cbz",
+            resourceWeight = ResourceWeight.LARGE_WEIGHT)
     @Operation(
             summary = "Convert PDF to CBZ comic book archive",
             description =
@@ -324,7 +330,10 @@ public class ConvertImgPDFController {
         return WebResponseUtils.zipFileToWebResponse(cbzFile, filename);
     }
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/cbr/pdf")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/cbr/pdf",
+            resourceWeight = ResourceWeight.MEDIUM_WEIGHT)
     @Operation(
             summary = "Convert CBR comic book archive to PDF",
             description =
@@ -350,7 +359,10 @@ public class ConvertImgPDFController {
         return WebResponseUtils.bytesToWebResponse(pdfBytes, filename);
     }
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/pdf/cbr")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/pdf/cbr",
+            resourceWeight = ResourceWeight.LARGE_WEIGHT)
     @Operation(
             summary = "Convert PDF to CBR comic book archive",
             description =

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/AttachmentController.java

@@ -141,7 +141,8 @@ public class AttachmentController {
 
     @AutoJobPostMapping(
             consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
-            value = "/extract-attachments")
+            value = "/extract-attachments",
+            resourceWeight = ResourceWeight.SMALL_WEIGHT)
     @Operation(
             summary = "Extract attachments from PDF",
             description =
@@ -176,7 +177,10 @@ public class AttachmentController {
         }
     }
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/list-attachments")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/list-attachments",
+            resourceWeight = ResourceWeight.SMALL_WEIGHT)
     @Operation(
             summary = "List attachments in PDF",
             description =
@@ -193,7 +197,8 @@ public class AttachmentController {
 
     @AutoJobPostMapping(
             consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
-            value = "/rename-attachment")
+            value = "/rename-attachment",
+            resourceWeight = ResourceWeight.SMALL_WEIGHT)
     @StandardPdfResponse
     @Operation(
             summary = "Rename attachment in PDF",
@@ -228,7 +233,8 @@ public class AttachmentController {
 
     @AutoJobPostMapping(
             consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
-            value = "/delete-attachment")
+            value = "/delete-attachment",
+            resourceWeight = ResourceWeight.SMALL_WEIGHT)
     @StandardPdfResponse
     @Operation(
             summary = "Delete attachment from PDF",

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ConfigController.java

@@ -12,6 +12,8 @@ import org.springframework.web.bind.annotation.RequestParam;
 
 import io.swagger.v3.oas.annotations.Hidden;
 
+import jakarta.servlet.http.HttpServletRequest;
+
 import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.SPDF.config.EndpointConfiguration;
@@ -91,6 +93,63 @@ public class ConfigController {
         return null;
     }
 
+    /**
+     * Resolve the frontend URL the client should advertise to phones / share-link recipients.
+     * Priority: explicit system.frontendUrl, then the Host the user is already using to reach this
+     * server (works for Docker, reverse proxies, and bare-metal LANs), then a detected site-local
+     * IPv4, then empty.
+     */
+    // visible for testing
+    String resolveFrontendUrl(HttpServletRequest request, AppConfig appConfig) {
+        String configured = applicationProperties.getSystem().getFrontendUrl();
+        if (configured != null && !configured.isBlank()) {
+            return configured;
+        }
+        if (request != null) {
+            String host = request.getServerName();
+            if (host != null && !host.isBlank() && !isLoopbackHost(host)) {
+                String scheme = request.getScheme();
+                int port = request.getServerPort();
+                boolean defaultPort =
+                        ("http".equals(scheme) && port == 80)
+                                || ("https".equals(scheme) && port == 443);
+                return defaultPort ? scheme + "://" + host : scheme + "://" + host + ":" + port;
+            }
+        }
+        String localIp = GeneralUtils.getLocalNetworkIp();
+        if (localIp != null) {
+            String scheme = appConfig.getBackendUrl().startsWith("https") ? "https" : "http";
+            return scheme + "://" + localIp + ":" + resolveEffectiveServerPort(appConfig);
+        }
+        return "";
+    }
+
+    /**
+     * The port the embedded server is actually listening on. With {@code server.port=0} (an
+     * ephemeral port, which the desktop bundle uses to dodge port clashes) the configured value
+     * stays {@code "0"} while Spring publishes the real bound port as {@code local.server.port}
+     * once the server is up. Advertised URLs (the mobile-scanner QR, share links) must carry the
+     * real port - a literal {@code :0} is unreachable and browsers reject it as ERR_UNSAFE_PORT.
+     */
+    // visible for testing
+    String resolveEffectiveServerPort(AppConfig appConfig) {
+        String configured = appConfig.getServerPort();
+        if (configured == null || "0".equals(configured.trim())) {
+            String actual = applicationContext.getEnvironment().getProperty("local.server.port");
+            if (actual != null && !actual.isBlank()) {
+                return actual;
+            }
+        }
+        return configured;
+    }
+
+    private static boolean isLoopbackHost(String host) {
+        return "localhost".equalsIgnoreCase(host)
+                || "127.0.0.1".equals(host)
+                || "::1".equals(host)
+                || "0:0:0:0:0:0:0:1".equals(host);
+    }
+
     /** Check if running Enterprise edition dynamically. */
     private Boolean isRunningEE() {
         // Use LicenseService for fresh license status if available
@@ -107,7 +166,7 @@ public class ConfigController {
     }
 
     @GetMapping("/app-config")
-    public ResponseEntity<Map<String, Object>> getAppConfig() {
+    public ResponseEntity<Map<String, Object>> getAppConfig(HttpServletRequest request) {
         Map<String, Object> configData = new HashMap<>();
 
         try {
@@ -121,20 +180,10 @@ public class ConfigController {
             // Note: Frontend expects "baseUrl" field name for compatibility
             configData.put("baseUrl", appConfig.getBackendUrl());
             configData.put("contextPath", appConfig.getContextPath());
-            configData.put("serverPort", appConfig.getServerPort());
+            configData.put("serverPort", resolveEffectiveServerPort(appConfig));
 
             String frontendUrl = applicationProperties.getSystem().getFrontendUrl();
-            if ((frontendUrl == null || frontendUrl.isBlank())
-                    && Boolean.parseBoolean(
-                            System.getProperty("STIRLING_PDF_TAURI_MODE", "false"))) {
-                String localIp = GeneralUtils.getLocalNetworkIp();
-                if (localIp != null) {
-                    String scheme =
-                            appConfig.getBackendUrl().startsWith("https") ? "https" : "http";
-                    frontendUrl = scheme + "://" + localIp + ":" + appConfig.getServerPort();
-                }
-            }
-            configData.put("frontendUrl", frontendUrl != null ? frontendUrl : "");
+            configData.put("frontendUrl", resolveFrontendUrl(request, appConfig));
 
             // Add mobile scanner settings
             configData.put(
@@ -277,6 +326,9 @@ public class ConfigController {
             // Premium/Enterprise settings
             configData.put("premiumEnabled", applicationProperties.getPremium().isEnabled());
 
+            // AI Engine settings
+            configData.put("aiEngineEnabled", applicationProperties.getAiEngine().isEnabled());
+
             // Timestamp TSA settings — single source of truth for presets + admin URLs
             ApplicationProperties.Security.Timestamp tsConfig =
                     applicationProperties.getSecurity().getTimestamp();

app/core/src/main/java/stirling/software/SPDF/controller/web/ReactRoutingController.java

@@ -12,6 +12,7 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;
+import org.springframework.http.CacheControl;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
@@ -134,13 +135,22 @@ public class ReactRoutingController {
     public ResponseEntity<String> serveIndexHtml(HttpServletRequest request) {
         try {
             if (indexHtmlExists && cachedIndexHtml != null) {
-                return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(cachedIndexHtml);
+                return ResponseEntity.ok()
+                        .cacheControl(CacheControl.noCache().mustRevalidate())
+                        .contentType(MediaType.TEXT_HTML)
+                        .body(cachedIndexHtml);
             }
             // Fallback: process on each request (dev mode or cache failed)
-            return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(processIndexHtml());
+            return ResponseEntity.ok()
+                    .cacheControl(CacheControl.noCache().mustRevalidate())
+                    .contentType(MediaType.TEXT_HTML)
+                    .body(processIndexHtml());
         } catch (Exception ex) {
             log.error("Failed to serve index.html, returning fallback", ex);
-            return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(buildFallbackHtml());
+            return ResponseEntity.ok()
+                    .cacheControl(CacheControl.noCache().mustRevalidate())
+                    .contentType(MediaType.TEXT_HTML)
+                    .body(buildFallbackHtml());
         }
     }
 
@@ -160,14 +170,19 @@ public class ReactRoutingController {
         return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(cachedCallbackHtml);
     }
 
+    // `files` was historically a backend static-asset directory and was therefore
+    // in the exclusion list - removing it lets /files and /files/<folder-uuid>
+    // forward to the SPA index.html, which is what FileManagerView expects.
+    // (Real storage endpoints live under /api/v1/storage/files, already
+    // excluded by the leading `api` token in the same regex.)
     @GetMapping(
-            "/{path:^(?!api|static|robots\\.txt|favicon\\.ico|manifest.*\\.json|pipeline|pdfjs|pdfjs-legacy|pdfium|vendor|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*$}")
+            "/{path:^(?!api|static|robots\\.txt|favicon\\.ico|manifest.*\\.json|pipeline|pdfjs|pdfjs-legacy|pdfium|vendor|fonts|images|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*$}")
     public ResponseEntity<String> forwardRootPaths(HttpServletRequest request) throws IOException {
         return serveIndexHtml(request);
     }
 
     @GetMapping(
-            "/{path:^(?!api|static|pipeline|pdfjs|pdfjs-legacy|pdfium|vendor|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*}/{subpath:^(?!.*\\.).*$}")
+            "/{path:^(?!api|static|pipeline|pdfjs|pdfjs-legacy|pdfium|vendor|fonts|images|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*}/{subpath:^(?!.*\\.).*$}")
     public ResponseEntity<String> forwardNestedPaths(HttpServletRequest request)
             throws IOException {
         return serveIndexHtml(request);

app/core/src/main/java/stirling/software/SPDF/exception/GlobalExceptionHandler.java

@@ -22,6 +22,7 @@ import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.multipart.MaxUploadSizeExceededException;
 import org.springframework.web.multipart.support.MissingServletRequestPartException;
+import org.springframework.web.server.ResponseStatusException;
 import org.springframework.web.servlet.NoHandlerFoundException;
 
 import jakarta.servlet.http.HttpServletRequest;
@@ -196,12 +197,12 @@ public class GlobalExceptionHandler {
     /**
      * Checks whether the given IOException indicates that the client disconnected before the
      * response could be written (broken pipe, connection reset, etc.). When this happens there is
-     * no point in serialising a {@link ProblemDetail} body because the socket is already closed —
+     * no point in serialising a {@link ProblemDetail} body because the socket is already closed -
      * and attempting to do so may trigger a secondary {@code HttpMessageNotWritableException} if
      * the response Content-Type was already committed as a non-JSON type (e.g. image/png).
      */
     private static boolean isClientDisconnectException(IOException ex) {
-        // Walk the causal chain — Jetty/Tomcat may wrap the low-level SocketException
+        // Walk the causal chain - Jetty/Tomcat may wrap the low-level SocketException
         Throwable current = ex;
         while (current != null) {
             String msg = current.getMessage();
@@ -1040,6 +1041,43 @@ public class GlobalExceptionHandler {
      * @param request the HTTP servlet request
      * @return ProblemDetail with appropriate HTTP status
      */
+    /**
+     * Handle ResponseStatusException explicitly so its embedded HTTP status reaches the client
+     * instead of being swallowed by the {@code RuntimeException} catch-all (which would downgrade
+     * every controller-thrown 400/404/409 to a generic 500). Folder/file storage controllers and
+     * any other code that throws {@code ResponseStatusException} relies on this handler taking
+     * precedence.
+     */
+    @ExceptionHandler(ResponseStatusException.class)
+    public ResponseEntity<ProblemDetail> handleResponseStatusException(
+            ResponseStatusException ex, HttpServletRequest request) {
+        HttpStatus status =
+                HttpStatus.resolve(ex.getStatusCode().value()) != null
+                        ? HttpStatus.valueOf(ex.getStatusCode().value())
+                        : HttpStatus.INTERNAL_SERVER_ERROR;
+        String reason = ex.getReason() != null ? ex.getReason() : status.getReasonPhrase();
+        ProblemDetail problemDetail = createBaseProblemDetail(status, reason, request);
+        problemDetail.setType(URI.create("/errors/" + status.value()));
+        problemDetail.setTitle(status.getReasonPhrase());
+        problemDetail.setProperty("title", status.getReasonPhrase());
+        // 5xx is operator-relevant; 4xx is a normal client-rejection - log at the right level.
+        if (status.is5xxServerError()) {
+            log.error(
+                    "ResponseStatusException {} at {}: {}",
+                    status.value(),
+                    request.getRequestURI(),
+                    reason,
+                    ex);
+        } else {
+            log.debug(
+                    "ResponseStatusException {} at {}: {}",
+                    status.value(),
+                    request.getRequestURI(),
+                    reason);
+        }
+        return ResponseEntity.status(status).contentType(PROBLEM_JSON).body(problemDetail);
+    }
+
     @ExceptionHandler(RuntimeException.class)
     public ResponseEntity<ProblemDetail> handleRuntimeException(
             RuntimeException ex, HttpServletRequest request) {

app/core/src/main/java/stirling/software/SPDF/model/api/PDFWithPageSize.java

@@ -18,4 +18,11 @@ public class PDFWithPageSize extends PDFFile {
             requiredMode = Schema.RequiredMode.REQUIRED,
             allowableValues = {"A0", "A1", "A2", "A3", "A4", "A5", "A6", "LETTER", "LEGAL", "KEEP"})
     private String pageSize;
+
+    @Schema(
+            description =
+                    "Orientation to apply to the target page size. Ignored when pageSize is KEEP.",
+            defaultValue = "PORTRAIT",
+            allowableValues = {"PORTRAIT", "LANDSCAPE"})
+    private String orientation = "PORTRAIT";
 }

app/core/src/main/java/stirling/software/SPDF/model/api/converters/ConvertPDFToMarkdown.java

@@ -13,7 +13,9 @@ import lombok.RequiredArgsConstructor;
 import stirling.software.SPDF.config.swagger.MarkdownConversionResponse;
 import stirling.software.common.annotations.AutoJobPostMapping;
 import stirling.software.common.annotations.api.ConvertApi;
+import stirling.software.common.enumeration.ResourceWeight;
 import stirling.software.common.model.api.PDFFile;
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.util.PDFToFile;
 import stirling.software.common.util.TempFileManager;
 
@@ -22,8 +24,12 @@ import stirling.software.common.util.TempFileManager;
 public class ConvertPDFToMarkdown {
 
     private final TempFileManager tempFileManager;
+    private final PyMuPdfConverter pyMuPdfConverter;
 
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/pdf/markdown")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/pdf/markdown",
+            resourceWeight = ResourceWeight.MEDIUM_WEIGHT)
     @MarkdownConversionResponse
     @Operation(
             summary = "Convert PDF to Markdown",
@@ -33,6 +39,6 @@ public class ConvertPDFToMarkdown {
             throws Exception {
         MultipartFile inputFile = file.getFileInput();
         PDFToFile pdfToFile = new PDFToFile(tempFileManager);
-        return pdfToFile.processPdfToMarkdown(inputFile);
+        return pdfToFile.processPdfToMarkdown(inputFile, pyMuPdfConverter);
     }
 }

app/core/src/main/resources/application.properties

@@ -33,7 +33,7 @@ spring.security.filter.dispatcher-types=REQUEST,ERROR
 # Response compression
 server.compression.enabled=true
 server.compression.min-response-size=1024
-server.compression.mime-types=application/json,application/xml,text/html,text/plain,text/css,application/javascript
+server.compression.mime-types=application/json,application/xml,text/html,text/plain,text/css,application/javascript,image/svg+xml,application/x-font-ttf,font/opentype,application/vnd.ms-fontobject,font/woff,font/woff2,application/font-woff,application/font-woff2
 
 spring.web.error.path=/error
 spring.web.error.whitelabel.enabled=false

app/core/src/main/resources/settings.yml.template

@@ -20,6 +20,7 @@ security:
     password: "" # initial password for the first login
   oauth2:
     enabled: false # set to 'true' to enable login (Note: enableLogin must also be 'true' for this to work)
+    debugLogging: false # set to 'true' to log full ID token and UserInfo claims during OAuth2/OIDC login. Use this to diagnose claim issues (e.g. "Attribute value for 'email' cannot be null" with ADFS). WARNING: writes PII (sub, email, name) to logs; disable after troubleshooting.
     client:
       keycloak:
         issuer: "" # URL of the Keycloak realm's OpenID Connect Discovery endpoint
@@ -93,8 +94,8 @@ premium:
   key: 00000000-0000-0000-0000-000000000000
   enabled: false # Enable license key checks for pro/enterprise features
   proFeatures:
-    SSOAutoLogin: false
-    CustomMetadata:
+    ssoAutoLogin: false
+    customMetadata:
       autoUpdateMetadata: false
       author: username
       creator: Stirling-PDF
@@ -245,6 +246,39 @@ storage:
   provider: local # storage provider: 'local' for filesystem storage, 'database' for DB-backed storage
   local:
     basePath: './storage' # base directory for stored files
+  # ====================================================================================
+  # S3-COMPATIBLE OBJECT STORAGE - PRO / ENTERPRISE LICENSE REQUIRED
+  # storage.provider=s3, storage.provider=database, and cluster.artifactStore=s3 all
+  # require a valid Pro or Enterprise license.
+  # ====================================================================================
+  # Used when provider=s3 (persistent user uploads) and/or cluster.artifactStore=s3
+  # (transient cluster artifacts). The two consumers share this block.
+  # Vendor cheat sheet (set the highlighted flags to taste):
+  #   AWS S3              -> endpoint='' region='<your-region>' pathStyleAccess=false
+  #   Cloudflare R2       -> endpoint='https://<acct>.r2.cloudflarestorage.com' region='auto'
+  #                          pathStyleAccess=false; if uploads fail with 'unsupported header
+  #                          x-amz-checksum-*' set requestChecksumCalculation=WHEN_REQUIRED
+  #   Supabase Storage    -> endpoint='https://<project>.supabase.co/storage/v1/s3'
+  #                          region='<project-region>' pathStyleAccess=true
+  #                          (filenames with non-ASCII display fine - the storage key is opaque)
+  #   MinIO (in-cluster)  -> endpoint='http://minio:9000' region='us-east-1'
+  #                          pathStyleAccess=true allowPrivateEndpoints=true
+  #   Backblaze B2        -> endpoint='https://s3.<region>.backblazeb2.com'
+  #                          If on a B2 deployment older than July-2025 and uploads return
+  #                          'Unsupported header x-amz-checksum-crc32', set
+  #                          requestChecksumCalculation=WHEN_REQUIRED
+  #   DigitalOcean Spaces -> endpoint='https://<region>.digitaloceanspaces.com'
+  #                          Note: 5GB per-object cap (regardless of multipart)
+  s3:
+    endpoint: "" # blank = use AWS regional default; otherwise full URL incl. https://
+    bucket: "" # required when provider=s3 or cluster.artifactStore=s3
+    region: us-east-1
+    accessKey: "" # blank = fall back to AWS DefaultCredentialsProvider (env / profile / IMDS)
+    secretKey: ""
+    pathStyleAccess: false # true for MinIO and Supabase; false for AWS/R2/most CDNs
+    allowPrivateEndpoints: false # true required when endpoint resolves to a private/loopback IP (e.g. in-cluster MinIO). SSRF guard - leave false for any internet-facing vendor.
+    requestChecksumCalculation: WHEN_SUPPORTED # WHEN_SUPPORTED|WHEN_REQUIRED|DISABLED. Set WHEN_REQUIRED if your vendor rejects auto-added x-amz-checksum-* headers (older Backblaze B2, some R2 corner cases).
+    responseChecksumValidation: WHEN_SUPPORTED # WHEN_SUPPORTED|WHEN_REQUIRED|DISABLED. Set WHEN_REQUIRED if you see false-positive checksum-mismatch errors on GET from a vendor that never returns checksum headers.
   quotas:
     maxStorageMbPerUser: -1 # Max storage per user in MB; -1 disables per-user cap
     maxStorageMbTotal: -1 # Max storage across all users in MB; -1 disables total cap
@@ -335,6 +369,8 @@ cluster:
   enabled: false # Master switch. 'false' (default) wires the in-process backplane and skips all cluster checks. Single-instance installs do not need to change anything here.
   backplane: inprocess # Backplane implementation: 'inprocess' (single JVM only) or 'valkey' (multi-node via Valkey/Redis)
   artifactStore: local # Transient cluster job-artifact backend: 'local' (per-node disk; single-node only) or 's3' (shared object store; required for multi-node). Distinct from 'storage.provider' which controls persistent user uploads - when both are 's3' they share the storage.s3.* credentials block. Multi-node deployments MUST set this to 's3'.
+  s3:
+    keyPrefix: transient/ # Bucket key prefix used by the cluster artifact store when artifactStore=s3. Trailing slash recommended. Lets a single bucket host both persistent uploads (storage.s3.*) and transient job artifacts under separate prefixes.
   valkey:
     url: "" # Valkey/Redis URL, e.g. 'redis://valkey:6379' or 'rediss://...' for TLS. Required when enabled=true and backplane=valkey.
     tls:

app/core/src/test/java/stirling/software/SPDF/config/AutoJobPostMappingWeightTest.java

@@ -0,0 +1,132 @@
+package stirling.software.SPDF.config;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.core.io.support.ResourcePatternResolver;
+import org.springframework.core.type.classreading.CachingMetadataReaderFactory;
+import org.springframework.core.type.classreading.MetadataReader;
+import org.springframework.core.type.classreading.MetadataReaderFactory;
+import org.springframework.core.type.filter.TypeFilter;
+
+import stirling.software.common.annotations.AutoJobPostMapping;
+
+/**
+ * Build-time guardrail: every {@link AutoJobPostMapping} method must declare an explicit {@code
+ * resourceWeight}.
+ *
+ * <p>The credits interceptor multiplies {@code resourceWeight} into the per-call charge. An
+ * endpoint that falls through to the annotation default produces a charge derived from a value
+ * nobody chose — silently under- or over-billing depending on the endpoint's true cost. Forcing
+ * each method to pick a value from {@link stirling.software.common.enumeration.ResourceWeight}
+ * keeps the choice deliberate.
+ *
+ * <p>The annotation's default is {@link Integer#MIN_VALUE} (a sentinel). Runtime readers clamp the
+ * value into {@code [1, 100]}, so a missed declaration can't crash production — this test is the
+ * contract, the clamp is the safety net.
+ *
+ * <p>Lives in {@code :stirling-pdf} (core) because that's the module whose compile classpath
+ * transitively sees every other module's controllers ({@code :common}, {@code :proprietary}, and
+ * {@code :saas} when enabled).
+ */
+class AutoJobPostMappingWeightTest {
+
+    private static final String SCAN_BASE_PACKAGE = "stirling.software";
+
+    @Test
+    void everyAutoJobPostMappingDeclaresExplicitResourceWeight() throws Exception {
+        List<String> offenders = findOffendingMethods();
+
+        assertTrue(
+                offenders.isEmpty(),
+                () ->
+                        "The following @AutoJobPostMapping methods do not declare an explicit"
+                                + " resourceWeight. Pick a value from"
+                                + " stirling.software.common.enumeration.ResourceWeight (SMALL,"
+                                + " MEDIUM, LARGE, XLARGE) and add it to the annotation:\n  - "
+                                + String.join("\n  - ", offenders));
+    }
+
+    private List<String> findOffendingMethods() throws IOException, ClassNotFoundException {
+        List<String> offenders = new ArrayList<>();
+        for (Class<?> candidate : scanForCandidateClasses()) {
+            for (Method method : candidate.getDeclaredMethods()) {
+                AutoJobPostMapping annotation = method.getAnnotation(AutoJobPostMapping.class);
+                if (annotation == null) {
+                    continue;
+                }
+                if (annotation.resourceWeight() == Integer.MIN_VALUE) {
+                    offenders.add(candidate.getName() + "#" + method.getName());
+                }
+            }
+        }
+        return offenders;
+    }
+
+    /**
+     * Returns every class under {@link #SCAN_BASE_PACKAGE} that has an @AutoJobPostMapping method.
+     */
+    private List<Class<?>> scanForCandidateClasses() throws IOException, ClassNotFoundException {
+        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
+        MetadataReaderFactory metadataReaderFactory = new CachingMetadataReaderFactory(resolver);
+
+        String pattern = "classpath*:" + SCAN_BASE_PACKAGE.replace('.', '/') + "/**/*.class";
+        Resource[] resources = resolver.getResources(pattern);
+
+        // Pre-filter by reading annotation metadata from the class file so we don't have to load
+        // every class on the test classpath just to find the few that are annotated.
+        TypeFilter mentionsAutoJobPostMapping =
+                (reader, factory) ->
+                        reader.getAnnotationMetadata()
+                                        .getAnnotatedMethods(AutoJobPostMapping.class.getName())
+                                        .size()
+                                > 0;
+
+        List<Class<?>> matches = new ArrayList<>();
+        for (Resource resource : resources) {
+            if (!resource.isReadable()) {
+                continue;
+            }
+            MetadataReader reader = metadataReaderFactory.getMetadataReader(resource);
+            if (!mentionsAutoJobPostMapping.match(reader, metadataReaderFactory)) {
+                continue;
+            }
+            matches.add(Class.forName(reader.getClassMetadata().getClassName()));
+        }
+        return matches;
+    }
+
+    /**
+     * Sanity check that the classpath scan returns non-empty; otherwise the main test passes
+     * vacuously.
+     */
+    @Test
+    void scannerFindsAtLeastOneAutoJobPostMapping() throws Exception {
+        long count =
+                scanForCandidateClasses().stream()
+                        .flatMap(c -> java.util.Arrays.stream(c.getDeclaredMethods()))
+                        .filter(m -> m.isAnnotationPresent(AutoJobPostMapping.class))
+                        .count();
+
+        assertTrue(
+                count > 10,
+                () ->
+                        "Expected the classpath scan to find many @AutoJobPostMapping methods but"
+                                + " found only "
+                                + count
+                                + ". Scanner regression?");
+    }
+
+    @SuppressWarnings("unused")
+    private static String describeCandidates(List<Class<?>> candidates) {
+        return candidates.stream().map(Class::getName).collect(Collectors.joining(", "));
+    }
+}

app/core/src/test/java/stirling/software/SPDF/controller/api/ScalePagesControllerTest.java

@@ -237,7 +237,8 @@ class ScalePagesControllerTest {
 
         ScalePagesRequest request = new ScalePagesRequest();
         request.setFileInput(file);
-        request.setPageSize("A4_LANDSCAPE");
+        request.setPageSize("A4");
+        request.setOrientation("LANDSCAPE");
         request.setScaleFactor(1.0f);
 
         setupFactory();

app/core/src/test/java/stirling/software/SPDF/controller/api/misc/ConfigControllerTest.java

@@ -15,10 +15,14 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 
+import jakarta.servlet.http.HttpServletRequest;
+
 import stirling.software.SPDF.config.EndpointConfiguration;
 import stirling.software.SPDF.config.EndpointConfiguration.DisableReason;
 import stirling.software.SPDF.config.EndpointConfiguration.EndpointAvailability;
+import stirling.software.common.configuration.AppConfig;
 import stirling.software.common.model.ApplicationProperties;
+import stirling.software.common.model.ApplicationProperties.System;
 import stirling.software.common.service.LicenseServiceInterface;
 import stirling.software.common.service.ServerCertificateServiceInterface;
 import stirling.software.common.service.UserServiceInterface;
@@ -173,4 +177,119 @@ class ConfigControllerTest {
         assertEquals(HttpStatus.OK, response.getStatusCode());
         verify(endpointConfiguration).getAllEndpoints();
     }
+
+    @Test
+    void resolveFrontendUrl_prefersExplicitConfiguredValue() {
+        System sys = mock(System.class);
+        when(applicationProperties.getSystem()).thenReturn(sys);
+        when(sys.getFrontendUrl()).thenReturn("https://pdf.example.com");
+
+        // Request would say something else, but configured wins.
+        HttpServletRequest req = mock(HttpServletRequest.class);
+        AppConfig appConfig = mock(AppConfig.class);
+
+        assertEquals(
+                "https://pdf.example.com", configController.resolveFrontendUrl(req, appConfig));
+    }
+
+    @Test
+    void resolveFrontendUrl_usesRequestHostWhenNotConfigured() {
+        System sys = mock(System.class);
+        when(applicationProperties.getSystem()).thenReturn(sys);
+        when(sys.getFrontendUrl()).thenReturn(null);
+
+        HttpServletRequest req = mock(HttpServletRequest.class);
+        when(req.getServerName()).thenReturn("192.168.1.100");
+        when(req.getScheme()).thenReturn("http");
+        when(req.getServerPort()).thenReturn(8080);
+
+        assertEquals(
+                "http://192.168.1.100:8080",
+                configController.resolveFrontendUrl(req, mock(AppConfig.class)));
+    }
+
+    @Test
+    void resolveFrontendUrl_elidesDefaultHttpsPort() {
+        System sys = mock(System.class);
+        when(applicationProperties.getSystem()).thenReturn(sys);
+        when(sys.getFrontendUrl()).thenReturn("");
+
+        HttpServletRequest req = mock(HttpServletRequest.class);
+        when(req.getServerName()).thenReturn("pdf.example.com");
+        when(req.getScheme()).thenReturn("https");
+        when(req.getServerPort()).thenReturn(443);
+
+        assertEquals(
+                "https://pdf.example.com",
+                configController.resolveFrontendUrl(req, mock(AppConfig.class)));
+    }
+
+    @Test
+    void resolveFrontendUrl_fallsThroughOnLoopbackHost() {
+        System sys = mock(System.class);
+        when(applicationProperties.getSystem()).thenReturn(sys);
+        when(sys.getFrontendUrl()).thenReturn(null);
+
+        HttpServletRequest req = mock(HttpServletRequest.class);
+        when(req.getServerName()).thenReturn("localhost");
+
+        AppConfig appConfig = mock(AppConfig.class);
+        when(appConfig.getBackendUrl()).thenReturn("http://localhost:8080");
+        when(appConfig.getServerPort()).thenReturn("8080");
+
+        // Detected IP (if any) wins over loopback request host. We can't assert the
+        // exact value (depends on the host running the test) but we can assert it
+        // never returns "localhost".
+        String result = configController.resolveFrontendUrl(req, appConfig);
+        assertNotNull(result);
+        assertFalse(result.contains("localhost"));
+    }
+
+    @Test
+    void resolveFrontendUrl_usesActualPortWhenServerPortIsEphemeral() {
+        System sys = mock(System.class);
+        when(applicationProperties.getSystem()).thenReturn(sys);
+        when(sys.getFrontendUrl()).thenReturn(null);
+
+        // Loopback host forces the detected-LAN-IP branch, which is where an
+        // ephemeral server.port=0 would otherwise leak through as ":0".
+        HttpServletRequest req = mock(HttpServletRequest.class);
+        when(req.getServerName()).thenReturn("localhost");
+
+        AppConfig appConfig = mock(AppConfig.class);
+        when(appConfig.getBackendUrl()).thenReturn("http://localhost");
+        when(appConfig.getServerPort()).thenReturn("0");
+
+        org.springframework.core.env.Environment environment =
+                mock(org.springframework.core.env.Environment.class);
+        when(applicationContext.getEnvironment()).thenReturn(environment);
+        when(environment.getProperty("local.server.port")).thenReturn("54321");
+
+        String result = configController.resolveFrontendUrl(req, appConfig);
+        assertNotNull(result);
+        assertTrue(result.endsWith(":54321"));
+        assertFalse(result.contains(":0"));
+    }
+
+    @Test
+    void resolveEffectiveServerPort_prefersActualBoundPortWhenConfiguredZero() {
+        AppConfig appConfig = mock(AppConfig.class);
+        when(appConfig.getServerPort()).thenReturn("0");
+
+        org.springframework.core.env.Environment environment =
+                mock(org.springframework.core.env.Environment.class);
+        when(applicationContext.getEnvironment()).thenReturn(environment);
+        when(environment.getProperty("local.server.port")).thenReturn("54321");
+
+        assertEquals("54321", configController.resolveEffectiveServerPort(appConfig));
+    }
+
+    @Test
+    void resolveEffectiveServerPort_keepsConfiguredNonZeroPort() {
+        AppConfig appConfig = mock(AppConfig.class);
+        when(appConfig.getServerPort()).thenReturn("8080");
+
+        // Non-zero configured port is authoritative; the runtime env is never consulted.
+        assertEquals("8080", configController.resolveEffectiveServerPort(appConfig));
+    }
 }

app/core/src/test/java/stirling/software/SPDF/model/api/converters/ConvertPDFToMarkdownTest.java

@@ -2,6 +2,7 @@ package stirling.software.SPDF.model.api.converters;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.nullable;
 import static org.mockito.Mockito.*;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.multipart;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
@@ -23,12 +24,13 @@ import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
 import org.springframework.web.multipart.MultipartFile;
 
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.util.PDFToFile;
 
 class ConvertPDFToMarkdownTest {
 
     private MockMvc mockMvc() {
-        return MockMvcBuilders.standaloneSetup(new ConvertPDFToMarkdown(null))
+        return MockMvcBuilders.standaloneSetup(new ConvertPDFToMarkdown(null, null))
                 .setControllerAdvice(new GlobalErrorHandler())
                 .build();
     }
@@ -52,7 +54,9 @@ class ConvertPDFToMarkdownTest {
                 Mockito.mockConstruction(
                         PDFToFile.class,
                         (mock, ctx) -> {
-                            when(mock.processPdfToMarkdown(any(MultipartFile.class)))
+                            when(mock.processPdfToMarkdown(
+                                            any(MultipartFile.class),
+                                            nullable(PyMuPdfConverter.class)))
                                     .thenAnswer(
                                             inv ->
                                                     ResponseEntity.ok()
@@ -83,7 +87,8 @@ class ConvertPDFToMarkdownTest {
             // And that the uploaded file was passed to processPdfToMarkdown()
             PDFToFile created = construction.constructed().get(0);
             ArgumentCaptor<MultipartFile> captor = ArgumentCaptor.forClass(MultipartFile.class);
-            verify(created, times(1)).processPdfToMarkdown(captor.capture());
+            verify(created, times(1))
+                    .processPdfToMarkdown(captor.capture(), nullable(PyMuPdfConverter.class));
             MultipartFile passed = captor.getValue();
 
             // Minimal plausibility checks
@@ -98,7 +103,9 @@ class ConvertPDFToMarkdownTest {
                 Mockito.mockConstruction(
                         PDFToFile.class,
                         (mock, ctx) -> {
-                            when(mock.processPdfToMarkdown(any(MultipartFile.class)))
+                            when(mock.processPdfToMarkdown(
+                                            any(MultipartFile.class),
+                                            nullable(PyMuPdfConverter.class)))
                                     .thenThrow(new RuntimeException("boom"));
                         })) {
 

app/core/src/test/java/stirling/software/common/configuration/ConfigInitializerRestartTest.java

@@ -0,0 +1,93 @@
+package stirling.software.common.configuration;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.mockStatic;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.mockito.MockedStatic;
+
+import stirling.software.common.util.GeneralUtils;
+import stirling.software.common.util.YamlHelper;
+
+/**
+ * End-to-end check of the container-restart path. {@link ConfigInitializer#ensureConfigExists()} is
+ * what runs on every startup, merging the on-disk settings.yml with the bundled
+ * settings.yml.template. These tests exercise it against the real template on the classpath to
+ * prove admin-saved proFeatures values survive a restart - the bug behind "the SSO auto-login
+ * button resets every time the container resets".
+ */
+class ConfigInitializerRestartTest {
+
+    private static String read(Path settings, String... keyPath) throws IOException {
+        return String.valueOf(new YamlHelper(settings).getValueByExactKeyPath(keyPath));
+    }
+
+    @Test
+    void ssoAutoLoginAndCustomMetadata_persistAcrossRestart(@TempDir Path tmp) throws Exception {
+        Path settings = tmp.resolve("settings.yml");
+        Path custom = tmp.resolve("custom_settings.yml");
+
+        try (MockedStatic<InstallationPathConfig> paths =
+                mockStatic(InstallationPathConfig.class)) {
+            paths.when(InstallationPathConfig::getSettingsPath).thenReturn(settings.toString());
+            paths.when(InstallationPathConfig::getCustomSettingsPath).thenReturn(custom.toString());
+
+            ConfigInitializer init = new ConfigInitializer();
+
+            // First boot: settings.yml created from the bundled template (camelCase, default off).
+            init.ensureConfigExists();
+            assertEquals("false", read(settings, "premium", "proFeatures", "ssoAutoLogin"));
+
+            // Admin enables SSO auto-login and edits custom metadata via the exact save path the
+            // admin settings controller uses.
+            GeneralUtils.saveKeyToSettings("premium.proFeatures.ssoAutoLogin", true);
+            GeneralUtils.saveKeyToSettings("premium.proFeatures.customMetadata.author", "acme");
+
+            // Container restart: ensureConfigExists merges the saved file with the template again.
+            init.ensureConfigExists();
+
+            assertEquals("true", read(settings, "premium", "proFeatures", "ssoAutoLogin"));
+            assertEquals(
+                    "acme", read(settings, "premium", "proFeatures", "customMetadata", "author"));
+        }
+    }
+
+    @Test
+    void legacyPascalCaseConfig_isMigratedAndPreservedOnRestart(@TempDir Path tmp)
+            throws Exception {
+        Path settings = tmp.resolve("settings.yml");
+        Path custom = tmp.resolve("custom_settings.yml");
+
+        try (MockedStatic<InstallationPathConfig> paths =
+                mockStatic(InstallationPathConfig.class)) {
+            paths.when(InstallationPathConfig::getSettingsPath).thenReturn(settings.toString());
+            paths.when(InstallationPathConfig::getCustomSettingsPath).thenReturn(custom.toString());
+
+            ConfigInitializer init = new ConfigInitializer();
+
+            // Seed a full settings.yml as an OLD install would have written it: PascalCase keys
+            // with
+            // SSO auto-login enabled.
+            init.ensureConfigExists();
+            String legacy =
+                    Files.readString(settings)
+                            .replace("ssoAutoLogin: false", "SSOAutoLogin: true")
+                            .replace("customMetadata:", "CustomMetadata:");
+            Files.writeString(settings, legacy);
+
+            // Upgrade restart.
+            init.ensureConfigExists();
+
+            // Value carried forward onto the new camelCase key; the legacy PascalCase key is gone.
+            assertEquals("true", read(settings, "premium", "proFeatures", "ssoAutoLogin"));
+            assertNull(
+                    new YamlHelper(settings)
+                            .getValueByExactKeyPath("premium", "proFeatures", "SSOAutoLogin"));
+        }
+    }
+}

app/proprietary/.gitignore

@@ -123,6 +123,8 @@ SwaggerDoc.json
 *.tar.gz
 *.rar
 *.db
+# Whitelist the H2 fixtures that feed the version-migration CI smoke test.
+!src/test/resources/db-migration-fixtures/*.mv.db
 /build
 /app/proprietary/build/
 

app/proprietary/build.gradle

@@ -5,6 +5,8 @@ repositories {
 
 ext {
     jwtVersion = '0.13.0'
+    awsSdkVersion = '2.44.12'
+    testcontainersMinioVersion = '1.21.4'
 }
 
 bootRun {
@@ -71,6 +73,13 @@ dependencies {
     implementation('com.coveo:saml-client:5.0.0') {
         exclude group: 'org.opensaml', module: 'opensaml-core'
     }
+
+    implementation "software.amazon.awssdk:s3:$awsSdkVersion"
+    implementation "software.amazon.awssdk:url-connection-client:$awsSdkVersion"
+
+    testImplementation "org.testcontainers:minio:$testcontainersMinioVersion"
+    testImplementation "org.testcontainers:junit-jupiter:$testcontainersMinioVersion"
+    testImplementation "org.testcontainers:localstack:$testcontainersMinioVersion"
 }
 
 tasks.register('prepareKotlinBuildScriptModel') {}

app/proprietary/src/main/java/stirling/software/proprietary/cluster/s3/S3Clients.java

@@ -0,0 +1,200 @@
+package stirling.software.proprietary.cluster.s3;
+
+import java.net.InetAddress;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.UnknownHostException;
+
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.model.ApplicationProperties;
+
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
+import software.amazon.awssdk.core.checksums.RequestChecksumCalculation;
+import software.amazon.awssdk.core.checksums.ResponseChecksumValidation;
+import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.S3ClientBuilder;
+import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+
+/**
+ * Shared factory for {@link S3Client} and {@link S3Presigner} instances used by both {@code
+ * S3StorageProvider} and {@code S3FileStore}, so endpoint/region/credentials wiring lives in
+ * exactly one place.
+ */
+@Slf4j
+public final class S3Clients {
+
+    private S3Clients() {}
+
+    /** Paired client and presigner with coordinated lifecycle. */
+    public record Bundle(S3Client client, S3Presigner presigner) implements AutoCloseable {
+        @Override
+        public void close() {
+            try {
+                presigner.close();
+            } catch (Exception e) {
+                log.warn("Error closing S3 presigner", e);
+            }
+            try {
+                client.close();
+            } catch (Exception e) {
+                log.warn("Error closing S3 client", e);
+            }
+        }
+    }
+
+    /** Build a client+presigner pair from the shared S3 config block. */
+    public static Bundle build(ApplicationProperties.Storage.S3 cfg, String usage) {
+        if (cfg == null) {
+            throw new IllegalStateException(
+                    usage + " requires storage.s3.* configuration to be set");
+        }
+        if (cfg.getBucket() == null || cfg.getBucket().isBlank()) {
+            throw new IllegalStateException(usage + " requires storage.s3.bucket to be set");
+        }
+        String region =
+                cfg.getRegion() == null || cfg.getRegion().isBlank()
+                        ? "us-east-1"
+                        : cfg.getRegion();
+
+        S3Configuration s3Configuration =
+                S3Configuration.builder().pathStyleAccessEnabled(cfg.isPathStyleAccess()).build();
+
+        RequestChecksumCalculation requestChecksum =
+                parseRequestChecksum(cfg.getRequestChecksumCalculation());
+        ResponseChecksumValidation responseChecksum =
+                parseResponseChecksum(cfg.getResponseChecksumValidation());
+
+        S3ClientBuilder clientBuilder =
+                S3Client.builder()
+                        .httpClient(UrlConnectionHttpClient.create())
+                        .region(Region.of(region))
+                        .serviceConfiguration(s3Configuration)
+                        .requestChecksumCalculation(requestChecksum)
+                        .responseChecksumValidation(responseChecksum);
+
+        S3Presigner.Builder presignerBuilder =
+                S3Presigner.builder()
+                        .region(Region.of(region))
+                        .serviceConfiguration(s3Configuration);
+
+        if (cfg.getEndpoint() != null && !cfg.getEndpoint().isBlank()) {
+            URI endpoint;
+            try {
+                endpoint = new URI(cfg.getEndpoint());
+            } catch (URISyntaxException e) {
+                throw new IllegalStateException(
+                        "Invalid storage.s3.endpoint: " + cfg.getEndpoint(), e);
+            }
+            validateEndpointHost(endpoint, cfg.isAllowPrivateEndpoints());
+            clientBuilder.endpointOverride(endpoint);
+            presignerBuilder.endpointOverride(endpoint);
+        }
+
+        boolean hasStaticCreds =
+                cfg.getAccessKey() != null
+                        && !cfg.getAccessKey().isBlank()
+                        && cfg.getSecretKey() != null
+                        && !cfg.getSecretKey().isBlank();
+        if (hasStaticCreds) {
+            AwsBasicCredentials credentials =
+                    AwsBasicCredentials.create(cfg.getAccessKey(), cfg.getSecretKey());
+            StaticCredentialsProvider provider = StaticCredentialsProvider.create(credentials);
+            clientBuilder.credentialsProvider(provider);
+            presignerBuilder.credentialsProvider(provider);
+        } else {
+            clientBuilder.credentialsProvider(DefaultCredentialsProvider.create());
+            presignerBuilder.credentialsProvider(DefaultCredentialsProvider.create());
+        }
+
+        log.debug(
+                "Configured S3 {}: bucket={}, region={}, endpoint={}, pathStyle={}",
+                usage,
+                cfg.getBucket(),
+                region,
+                cfg.getEndpoint() == null || cfg.getEndpoint().isBlank()
+                        ? "<aws-default>"
+                        : cfg.getEndpoint(),
+                cfg.isPathStyleAccess());
+
+        return new Bundle(clientBuilder.build(), presignerBuilder.build());
+    }
+
+    /**
+     * Block SSRF via the S3 endpoint setting. An admin who can edit config could otherwise point
+     * the SDK at the cloud metadata service (e.g. {@code http://169.254.169.254/}) and exfiltrate
+     * instance-role credentials. Reject any endpoint whose host resolves to a loopback, link-local,
+     * or RFC1918 private address unless the operator has explicitly opted in via {@code
+     * storage.s3.allow-private-endpoints=true}.
+     */
+    static void validateEndpointHost(URI endpoint, boolean allowPrivate) {
+        if (allowPrivate) {
+            return;
+        }
+        String host = endpoint.getHost();
+        if (host == null || host.isBlank()) {
+            throw new IllegalStateException("storage.s3.endpoint must include a host: " + endpoint);
+        }
+        InetAddress[] addresses;
+        try {
+            addresses = InetAddress.getAllByName(host);
+        } catch (UnknownHostException e) {
+            throw new IllegalStateException(
+                    "Unable to resolve storage.s3.endpoint host '" + host + "'", e);
+        }
+        for (InetAddress address : addresses) {
+            if (isPrivateOrLocal(address)) {
+                throw new IllegalStateException(
+                        "storage.s3.endpoint host '"
+                                + host
+                                + "' resolves to private/link-local address "
+                                + address.getHostAddress()
+                                + "; set storage.s3.allow-private-endpoints=true to opt in"
+                                + " (e.g. for MinIO or in-cluster S3).");
+            }
+        }
+    }
+
+    private static boolean isPrivateOrLocal(InetAddress address) {
+        return address.isLoopbackAddress()
+                || address.isLinkLocalAddress()
+                || address.isSiteLocalAddress()
+                || address.isAnyLocalAddress()
+                || address.isMulticastAddress();
+    }
+
+    static RequestChecksumCalculation parseRequestChecksum(String value) {
+        if (value == null || value.isBlank()) {
+            return RequestChecksumCalculation.WHEN_SUPPORTED;
+        }
+        try {
+            return RequestChecksumCalculation.valueOf(
+                    value.trim().toUpperCase(java.util.Locale.ROOT));
+        } catch (IllegalArgumentException ex) {
+            log.warn(
+                    "Unknown storage.s3.request-checksum-calculation value '{}', falling back to WHEN_SUPPORTED",
+                    value);
+            return RequestChecksumCalculation.WHEN_SUPPORTED;
+        }
+    }
+
+    static ResponseChecksumValidation parseResponseChecksum(String value) {
+        if (value == null || value.isBlank()) {
+            return ResponseChecksumValidation.WHEN_SUPPORTED;
+        }
+        try {
+            return ResponseChecksumValidation.valueOf(
+                    value.trim().toUpperCase(java.util.Locale.ROOT));
+        } catch (IllegalArgumentException ex) {
+            log.warn(
+                    "Unknown storage.s3.response-checksum-validation value '{}', falling back to WHEN_SUPPORTED",
+                    value);
+            return ResponseChecksumValidation.WHEN_SUPPORTED;
+        }
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/cluster/s3/S3FileStore.java

@@ -0,0 +1,226 @@
+package stirling.software.proprietary.cluster.s3;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.Optional;
+import java.util.UUID;
+
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.cluster.FileStore;
+
+import software.amazon.awssdk.core.ResponseInputStream;
+import software.amazon.awssdk.core.exception.SdkException;
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectResponse;
+import software.amazon.awssdk.services.s3.model.HeadObjectRequest;
+import software.amazon.awssdk.services.s3.model.HeadObjectResponse;
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException;
+import software.amazon.awssdk.services.s3.model.PutObjectRequest;
+import software.amazon.awssdk.services.s3.model.S3Exception;
+
+/**
+ * S3-backed {@link FileStore} for transient job-result files. Objects are namespaced under a
+ * configurable key prefix (default {@code transient/}) and can coexist in the same bucket as {@code
+ * S3StorageProvider}.
+ */
+@Slf4j
+public class S3FileStore implements FileStore, AutoCloseable {
+
+    public static final String DEFAULT_KEY_PREFIX = "transient/";
+
+    private final S3Client s3Client;
+    private final String bucket;
+    private final String keyPrefix;
+    private final boolean ownsClient;
+
+    public S3FileStore(S3Client s3Client, String bucket) {
+        this(s3Client, bucket, DEFAULT_KEY_PREFIX, true);
+    }
+
+    public S3FileStore(S3Client s3Client, String bucket, String keyPrefix) {
+        this(s3Client, bucket, keyPrefix, true);
+    }
+
+    /**
+     * @param ownsClient when true, {@link #close()} will close the supplied client. Set to false in
+     *     tests that share the client with another consumer.
+     */
+    public S3FileStore(S3Client s3Client, String bucket, String keyPrefix, boolean ownsClient) {
+        if (bucket == null || bucket.isBlank()) {
+            throw new IllegalArgumentException("S3 bucket must be configured");
+        }
+        this.s3Client = s3Client;
+        this.bucket = bucket;
+        this.keyPrefix = normalizePrefix(keyPrefix);
+        this.ownsClient = ownsClient;
+    }
+
+    @Override
+    public Stored store(InputStream in, String originalName) throws IOException {
+        String fileId = UUID.randomUUID().toString();
+        // S3 PUT requires a known content-length; spool to a temp file first so memory stays
+        // bounded for large payloads, then stream the file to S3 via RequestBody.fromFile.
+        Path tempFile = Files.createTempFile("s3-upload-", ".bin");
+        long size;
+        try {
+            try (InputStream src = in) {
+                Files.copy(src, tempFile, StandardCopyOption.REPLACE_EXISTING);
+            }
+            size = Files.size(tempFile);
+            PutObjectRequest request =
+                    PutObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build();
+            try {
+                s3Client.putObject(request, RequestBody.fromFile(tempFile));
+            } catch (SdkException e) {
+                throw new IOException("Failed to upload object to S3", e);
+            }
+        } finally {
+            try {
+                Files.deleteIfExists(tempFile);
+            } catch (IOException cleanupError) {
+                log.warn("Failed to delete S3 upload temp file: {}", tempFile, cleanupError);
+            }
+        }
+        return new Stored(fileId, size);
+    }
+
+    @Override
+    public InputStream retrieve(String fileId) throws IOException {
+        validateFileId(fileId);
+        GetObjectRequest request =
+                GetObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build();
+        try {
+            ResponseInputStream<GetObjectResponse> stream = s3Client.getObject(request);
+            return new BufferedInputStream(stream);
+        } catch (NoSuchKeyException e) {
+            throw new IOException("File not found with ID: " + fileId, e);
+        } catch (SdkException e) {
+            throw new IOException("Failed to load object from S3", e);
+        }
+    }
+
+    @Override
+    public byte[] retrieveBytes(String fileId) throws IOException {
+        validateFileId(fileId);
+        GetObjectRequest request =
+                GetObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build();
+        try (ResponseInputStream<GetObjectResponse> stream = s3Client.getObject(request)) {
+            return stream.readAllBytes();
+        } catch (NoSuchKeyException e) {
+            throw new IOException("File not found with ID: " + fileId, e);
+        } catch (SdkException e) {
+            throw new IOException("Failed to load object from S3", e);
+        }
+    }
+
+    @Override
+    public long size(String fileId) throws IOException {
+        validateFileId(fileId);
+        HeadObjectRequest request =
+                HeadObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build();
+        try {
+            HeadObjectResponse response = s3Client.headObject(request);
+            return Optional.ofNullable(response.contentLength()).orElse(0L);
+        } catch (NoSuchKeyException e) {
+            throw new IOException("File not found with ID: " + fileId, e);
+        } catch (S3Exception e) {
+            if (e.statusCode() == 404) {
+                throw new IOException("File not found with ID: " + fileId, e);
+            }
+            throw new IOException("Failed to head object in S3", e);
+        } catch (SdkException e) {
+            throw new IOException("Failed to head object in S3", e);
+        }
+    }
+
+    @Override
+    public boolean delete(String fileId) {
+        try {
+            validateFileId(fileId);
+        } catch (IllegalArgumentException e) {
+            log.warn("Refusing to delete invalid file id: {}", fileId);
+            return false;
+        }
+        try {
+            s3Client.deleteObject(
+                    DeleteObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build());
+            return true;
+        } catch (SdkException e) {
+            log.error("Error deleting file with ID: {}", fileId, e);
+            return false;
+        }
+    }
+
+    @Override
+    public boolean exists(String fileId) {
+        try {
+            validateFileId(fileId);
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+        HeadObjectRequest request =
+                HeadObjectRequest.builder().bucket(bucket).key(resolveKey(fileId)).build();
+        try {
+            s3Client.headObject(request);
+            return true;
+        } catch (NoSuchKeyException e) {
+            return false;
+        } catch (S3Exception e) {
+            if (e.statusCode() == 404) {
+                return false;
+            }
+            log.warn("Error checking existence for file ID: {}", fileId, e);
+            return false;
+        } catch (SdkException e) {
+            log.warn("Error checking existence for file ID: {}", fileId, e);
+            return false;
+        }
+    }
+
+    @Override
+    public void close() {
+        if (!ownsClient) {
+            return;
+        }
+        try {
+            s3Client.close();
+        } catch (Exception e) {
+            log.warn("Error closing S3 client", e);
+        }
+    }
+
+    String resolveKey(String fileId) {
+        return keyPrefix + fileId;
+    }
+
+    private static void validateFileId(String fileId) {
+        if (fileId == null || fileId.isBlank()) {
+            throw new IllegalArgumentException("File ID must not be blank");
+        }
+        if (fileId.contains("..") || fileId.contains("/") || fileId.contains("\\")) {
+            throw new IllegalArgumentException("Invalid file ID");
+        }
+    }
+
+    private static String normalizePrefix(String prefix) {
+        if (prefix == null || prefix.isBlank()) {
+            return "";
+        }
+        String trimmed = prefix.trim();
+        if (trimmed.startsWith("/")) {
+            trimmed = trimmed.substring(1);
+        }
+        if (!trimmed.isEmpty() && !trimmed.endsWith("/")) {
+            trimmed = trimmed + "/";
+        }
+        return trimmed;
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/cluster/s3/S3FileStoreConfiguration.java

@@ -0,0 +1,37 @@
+package stirling.software.proprietary.cluster.s3;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.cluster.FileStore;
+import stirling.software.common.model.ApplicationProperties;
+
+/** Activates the S3-backed transient {@link FileStore} when {@code cluster.artifactStore=s3}. */
+@Slf4j
+@Configuration
+@RequiredArgsConstructor
+@ConditionalOnProperty(prefix = "cluster", name = "artifactStore", havingValue = "s3")
+public class S3FileStoreConfiguration {
+
+    private final ApplicationProperties applicationProperties;
+
+    @Bean(destroyMethod = "close")
+    @ConditionalOnMissingBean
+    public FileStore fileStore(@Value("${cluster.s3.keyPrefix:transient/}") String keyPrefix) {
+        ApplicationProperties.Storage.S3 cfg = applicationProperties.getStorage().getS3();
+        S3Clients.Bundle bundle = S3Clients.build(cfg, "cluster file store");
+        // FileStore has no signed-URL contract; close the unused presigner immediately.
+        try {
+            bundle.presigner().close();
+        } catch (Exception ignored) {
+        }
+        log.info("Cluster FileStore: s3 (bucket={}, keyPrefix={})", cfg.getBucket(), keyPrefix);
+        return new S3FileStore(bundle.client(), cfg.getBucket(), keyPrefix, true);
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/model/api/ai/AiPdfContentType.java

@@ -32,7 +32,10 @@ public enum AiPdfContentType {
 
     // Heavy content
     COMPLIANCE("compliance"),
-    IMAGES("images");
+    IMAGES("images"),
+
+    // PyMuPDF worker — pre-rendered Markdown
+    PYMUPDF_MARKDOWN("pymupdf_markdown");
 
     private final String value;
 

app/proprietary/src/main/java/stirling/software/proprietary/model/api/ai/AiWorkflowRequest.java

@@ -11,7 +11,7 @@ import jakarta.validation.constraints.NotNull;
 import lombok.Data;
 
 @Data
-@Schema(description = "Run an AI workflow against one or more PDF files")
+@Schema(description = "Run an AI workflow")
 public class AiWorkflowRequest {
 
     @NotNull

app/proprietary/src/main/java/stirling/software/proprietary/security/configuration/ee/EEAppConfig.java

@@ -49,7 +49,11 @@ public class EEAppConfig {
     @Profile("security & !saas")
     @Bean(name = "SSOAutoLogin")
     public boolean ssoAutoLogin() {
-        return applicationProperties.getPremium().getProFeatures().isSsoAutoLogin();
+        boolean enabled = applicationProperties.getPremium().getProFeatures().isSsoAutoLogin();
+        if (enabled) {
+            licenseKeyChecker.requireProOrEnterprise("premium.proFeatures.ssoAutoLogin=true");
+        }
+        return enabled;
     }
 
     // TODO: Remove post migration

app/proprietary/src/main/java/stirling/software/proprietary/security/configuration/ee/LicenseKeyChecker.java

@@ -32,7 +32,10 @@ public class LicenseKeyChecker {
 
     private final UserLicenseSettingsService licenseSettingsService;
 
-    private License premiumEnabledResult = License.NORMAL;
+    // volatile: written by evaluateLicense() on the @Scheduled refresh thread, read by request
+    // threads via getPremiumLicenseEnabledResult() / requireProOrEnterprise(). Ensures readers see
+    // the latest tier rather than a stale cached value.
+    private volatile License premiumEnabledResult = License.NORMAL;
 
     public LicenseKeyChecker(
             KeygenLicenseVerifier licenseService,
@@ -133,4 +136,16 @@ public class LicenseKeyChecker {
     public License getPremiumLicenseEnabledResult() {
         return premiumEnabledResult;
     }
+
+    /**
+     * Throws {@link IllegalStateException} if the current license is not Pro or Enterprise. Used by
+     * boot-time gates to fail fast when an operator enables a premium-only setting without a valid
+     * license. {@code configuredAs} is the human-readable property path (e.g. {@code
+     * "storage.provider=s3"}) and appears in the exception message.
+     */
+    public void requireProOrEnterprise(String configuredAs) {
+        if (premiumEnabledResult != License.SERVER && premiumEnabledResult != License.ENTERPRISE) {
+            throw new IllegalStateException(configuredAs + " requires a Pro or Enterprise license");
+        }
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/security/controller/api/EmailController.java

@@ -17,6 +17,7 @@ import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.common.annotations.AutoJobPostMapping;
 import stirling.software.common.annotations.api.GeneralApi;
+import stirling.software.common.enumeration.ResourceWeight;
 import stirling.software.proprietary.security.model.api.Email;
 import stirling.software.proprietary.security.service.EmailService;
 
@@ -39,7 +40,10 @@ public class EmailController {
      *     attachment.
      * @return ResponseEntity with success or error message.
      */
-    @AutoJobPostMapping(consumes = MediaType.MULTIPART_FORM_DATA_VALUE, value = "/send-email")
+    @AutoJobPostMapping(
+            consumes = MediaType.MULTIPART_FORM_DATA_VALUE,
+            value = "/send-email",
+            resourceWeight = ResourceWeight.SMALL_WEIGHT)
     @Operation(
             summary = "Send an email with an attachment",
             description =

app/proprietary/src/main/java/stirling/software/proprietary/security/service/CustomOAuth2UserService.java

@@ -1,6 +1,10 @@
 package stirling.software.proprietary.security.service;
 
+import java.util.Collections;
+import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
 
 import org.springframework.security.authentication.LockedException;
 import org.springframework.security.oauth2.client.oidc.userinfo.OidcUserRequest;
@@ -8,6 +12,8 @@ import org.springframework.security.oauth2.client.oidc.userinfo.OidcUserService;
 import org.springframework.security.oauth2.client.userinfo.OAuth2UserService;
 import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
 import org.springframework.security.oauth2.core.OAuth2Error;
+import org.springframework.security.oauth2.core.oidc.OidcIdToken;
+import org.springframework.security.oauth2.core.oidc.OidcUserInfo;
 import org.springframework.security.oauth2.core.oidc.user.DefaultOidcUser;
 import org.springframework.security.oauth2.core.oidc.user.OidcUser;
 
@@ -39,20 +45,37 @@ public class CustomOAuth2UserService implements OAuth2UserService<OidcUserReques
 
     @Override
     public OidcUser loadUser(OidcUserRequest userRequest) throws OAuth2AuthenticationException {
+        String registrationId = userRequest.getClientRegistration().getRegistrationId();
+        boolean debugLogging = Boolean.TRUE.equals(oauth2Properties.getDebugLogging());
+        // Resolved inside the try so a bad/null useAsUsername (IllegalArgumentException from
+        // valueOf, or NPE on toUpperCase) is caught and wrapped as OAuth2AuthenticationException
+        // by the existing handlers below, matching the pre-debugLogging behaviour.
+        String usernameAttributeKey = null;
+
         try {
-            OidcUser user = delegate.loadUser(userRequest);
-            String usernameAttributeKey =
+            usernameAttributeKey =
                     UsernameAttribute.valueOf(oauth2Properties.getUseAsUsername().toUpperCase())
                             .getName();
+            OidcUser user = delegate.loadUser(userRequest);
+
+            if (debugLogging) {
+                logClaimDump(
+                        "OAuth2/OIDC login claims received",
+                        registrationId,
+                        usernameAttributeKey,
+                        user.getIdToken(),
+                        user.getUserInfo(),
+                        user.getAttributes(),
+                        false);
+            }
 
             // Extract SSO provider information
             String ssoProviderId = user.getSubject(); // Standard OIDC 'sub' claim
-            String ssoProvider = userRequest.getClientRegistration().getRegistrationId();
             String username = user.getAttribute(usernameAttributeKey);
 
             log.debug(
                     "OAuth2 login - Provider: {}, ProviderId: {}, Username: {}",
-                    ssoProvider,
+                    registrationId,
                     ssoProviderId,
                     username);
 
@@ -79,10 +102,154 @@ public class CustomOAuth2UserService implements OAuth2UserService<OidcUserReques
                     usernameAttributeKey);
         } catch (IllegalArgumentException e) {
             log.error("Error loading OIDC user: {}", e.getMessage());
+            // Only emit the claim dump if we successfully resolved usernameAttributeKey. A null
+            // value here means UsernameAttribute.valueOf rejected the configured useAsUsername
+            // before delegate.loadUser ran — that error message is self-explanatory and a claim
+            // dump would have no resolved-key to compare against.
+            if (debugLogging && usernameAttributeKey != null) {
+                // The DefaultOidcUser constructor (or our own checks) rejected the chosen
+                // username attribute. Dump the claims we DID receive so the operator can pick
+                // a different value for security.oauth2.useAsUsername.
+                logClaimDump(
+                        "OAuth2/OIDC login FAILED - dumping received claims",
+                        registrationId,
+                        usernameAttributeKey,
+                        userRequest.getIdToken(),
+                        null,
+                        userRequest.getIdToken() == null
+                                ? Collections.emptyMap()
+                                : userRequest.getIdToken().getClaims(),
+                        true);
+            }
             throw new OAuth2AuthenticationException(new OAuth2Error(e.getMessage()), e);
         } catch (Exception e) {
             log.error("Unexpected error loading OIDC user", e);
+            if (debugLogging && usernameAttributeKey != null && userRequest.getIdToken() != null) {
+                logClaimDump(
+                        "OAuth2/OIDC login FAILED (unexpected error) - dumping ID token claims",
+                        registrationId,
+                        usernameAttributeKey,
+                        userRequest.getIdToken(),
+                        null,
+                        userRequest.getIdToken().getClaims(),
+                        true);
+            }
             throw new OAuth2AuthenticationException("Unexpected error during authentication");
         }
     }
+
+    /**
+     * Emits a multi-line diagnostic dump of the claims returned by the OAuth2/OIDC provider. Only
+     * invoked when {@code security.oauth2.debugLogging=true}.
+     *
+     * @param banner short title for the log block
+     * @param registrationId Spring client registration id (e.g. "demarest", "keycloak")
+     * @param usernameAttributeKey the claim key the application is configured to use as username
+     * @param idToken the decoded ID token, may be null on unexpected failures
+     * @param userInfo the decoded UserInfo response, may be null if the provider returned none
+     * @param mergedAttributes the merged attribute map Spring uses for {@code getAttribute()}
+     * @param failure true if logging in the error path (uses ERROR level), false for INFO
+     */
+    private void logClaimDump(
+            String banner,
+            String registrationId,
+            String usernameAttributeKey,
+            OidcIdToken idToken,
+            OidcUserInfo userInfo,
+            Map<String, Object> mergedAttributes,
+            boolean failure) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("\n========== [OAUTH2 DEBUG] ").append(banner).append(" ==========\n");
+        sb.append("Provider registrationId : ").append(registrationId).append('\n');
+        sb.append("Configured useAsUsername: ")
+                .append(oauth2Properties.getUseAsUsername())
+                .append(" (looks up claim key '")
+                .append(usernameAttributeKey)
+                .append("')\n");
+
+        if (idToken != null) {
+            Map<String, Object> idClaims = idToken.getClaims();
+            sb.append("\n-- ID token claims (")
+                    .append(idClaims == null ? 0 : idClaims.size())
+                    .append(") --\n");
+            appendClaims(sb, idClaims);
+            sb.append("ID token issued at : ").append(idToken.getIssuedAt()).append('\n');
+            sb.append("ID token expires at: ").append(idToken.getExpiresAt()).append('\n');
+        } else {
+            sb.append("\n-- ID token: <null> --\n");
+        }
+
+        if (userInfo != null && userInfo.getClaims() != null) {
+            sb.append("\n-- UserInfo endpoint claims (")
+                    .append(userInfo.getClaims().size())
+                    .append(") --\n");
+            appendClaims(sb, userInfo.getClaims());
+        } else {
+            sb.append("\n-- UserInfo endpoint claims: none returned --\n");
+        }
+
+        if (mergedAttributes != null) {
+            sb.append("\n-- Merged attribute keys available to useAsUsername: ")
+                    .append(new TreeSet<>(mergedAttributes.keySet()))
+                    .append("\n");
+            Object resolved = mergedAttributes.get(usernameAttributeKey);
+            sb.append("-- Value at '")
+                    .append(usernameAttributeKey)
+                    .append("' : ")
+                    .append(resolved == null ? "<NULL — this is why login fails>" : resolved)
+                    .append('\n');
+
+            if (resolved == null) {
+                Set<String> hints = suggestUsernameClaims(mergedAttributes.keySet());
+                if (!hints.isEmpty()) {
+                    sb.append(
+                                    "-- Hint: the following claim(s) are present and map to a"
+                                            + " known UsernameAttribute value — try setting"
+                                            + " security.oauth2.useAsUsername to one of: ")
+                            .append(hints)
+                            .append('\n');
+                }
+            }
+        }
+
+        sb.append(
+                "\nWARNING: this block contains PII. Set security.oauth2.debugLogging=false once"
+                        + " troubleshooting is complete.\n");
+        sb.append("========== [/OAUTH2 DEBUG] ==========");
+
+        if (failure) {
+            log.error(sb.toString());
+        } else {
+            log.info(sb.toString());
+        }
+    }
+
+    private static void appendClaims(StringBuilder sb, Map<String, Object> claims) {
+        if (claims == null || claims.isEmpty()) {
+            sb.append("  (no claims)\n");
+            return;
+        }
+        // Sort for stable, scannable output
+        new TreeSet<>(claims.keySet())
+                .forEach(
+                        key -> {
+                            Object value = claims.get(key);
+                            sb.append("  ").append(key).append(" = ").append(value).append('\n');
+                        });
+    }
+
+    /**
+     * Returns the intersection of the claim keys the provider actually returned and the keys that
+     * {@link UsernameAttribute} accepts — i.e. valid values the operator could put in {@code
+     * security.oauth2.useAsUsername} to make this login work.
+     */
+    private static Set<String> suggestUsernameClaims(Set<String> availableClaimKeys) {
+        Set<String> supported = new TreeSet<>();
+        for (UsernameAttribute attr : UsernameAttribute.values()) {
+            if (availableClaimKeys.contains(attr.getName())) {
+                supported.add(attr.getName());
+            }
+        }
+        return supported;
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/service/AiWorkflowService.java

@@ -31,6 +31,7 @@ import stirling.software.common.service.CustomPDFDocumentFactory;
 import stirling.software.common.service.FileStorage;
 import stirling.software.common.service.InternalApiClient;
 import stirling.software.common.service.InternalApiTimeoutException;
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.service.ToolMetadataService;
 import stirling.software.common.util.ExceptionUtils;
 import stirling.software.common.util.TempFile;
@@ -74,6 +75,7 @@ public class AiWorkflowService {
     private final TempFileManager tempFileManager;
     private final FileIdStrategy fileIdStrategy;
     private final AiEngineEndpointResolver endpointResolver;
+    private final PyMuPdfConverter pyMuPdfConverter;
 
     @FunctionalInterface
     public interface ProgressListener {
@@ -137,6 +139,9 @@ public class AiWorkflowService {
                         ? new ArrayList<>()
                         : new ArrayList<>(request.getConversationHistory()));
         initialRequest.setEnabledEndpoints(endpointResolver.getEnabledEndpointUrls());
+        boolean workerAvailable = pyMuPdfConverter.isAvailable();
+        initialRequest.setPymupdfWorkerAvailable(workerAvailable);
+        log.info("[pymupdf-convert] available={}", workerAvailable);
 
         listener.onProgress(AiWorkflowProgressEvent.of(AiWorkflowPhase.ANALYZING));
 
@@ -183,6 +188,13 @@ public class AiWorkflowService {
                     cannotContinue("AI engine requested content extraction more than once."));
         }
 
+        // Fast path: when the engine identifies a pdf-to-markdown task and pymupdf-convert is
+        // available, skip feeding content back to the engine and convert directly.
+        if ("pdf_to_markdown".equals(response.getResumeWith())
+                && request.isPymupdfWorkerAvailable()) {
+            return runPyMuPdfConversion(filesById, listener);
+        }
+
         List<AiWorkflowFileRequest> requestedFiles = response.getFiles();
 
         // Validate requested file ids before loading anything
@@ -365,6 +377,31 @@ public class AiWorkflowService {
         return new WorkflowState.Terminal(response);
     }
 
+    private WorkflowState runPyMuPdfConversion(
+            Map<String, MultipartFile> filesById, ProgressListener listener) throws IOException {
+        listener.onProgress(AiWorkflowProgressEvent.of(AiWorkflowPhase.PROCESSING));
+        List<Resource> outputs = new ArrayList<>();
+        for (MultipartFile file : filesById.values()) {
+            String baseName =
+                    file.getOriginalFilename() != null
+                            ? file.getOriginalFilename().replaceFirst("\\.[^.]+$", "")
+                            : "document";
+            String markdown =
+                    pyMuPdfConverter.convertToMarkdown(file.getBytes(), file.getOriginalFilename());
+            String safeFilename = Filenames.toSimpleFileName(baseName + ".md");
+            byte[] bytes = markdown.getBytes(java.nio.charset.StandardCharsets.UTF_8);
+            outputs.add(
+                    new org.springframework.core.io.ByteArrayResource(bytes) {
+                        @Override
+                        public String getFilename() {
+                            return safeFilename;
+                        }
+                    });
+        }
+        return new WorkflowState.Terminal(
+                buildCompletedResponse("Converted PDF to Markdown.", outputs, List.of(), null));
+    }
+
     private WorkflowState onGenerateFile(AiWorkflowResponse response, ProgressListener listener)
             throws IOException {
         String content = response.getGeneratedContent();
@@ -745,5 +782,6 @@ public class AiWorkflowService {
         private List<WorkflowArtifact> artifacts = new ArrayList<>();
         private String resumeWith;
         private List<String> enabledEndpoints = new ArrayList<>();
+        private boolean pymupdfWorkerAvailable;
     }
 }

app/proprietary/src/main/java/stirling/software/proprietary/service/PdfContentExtractor.java

@@ -30,6 +30,7 @@ import stirling.software.SPDF.pdf.parser.PdfModels.RawLine;
 import stirling.software.SPDF.pdf.parser.PdfModels.TableFragment;
 import stirling.software.SPDF.pdf.parser.PdfModels.TextFragment;
 import stirling.software.SPDF.pdf.parser.TabulaTableParser;
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.util.ExceptionUtils;
 import stirling.software.common.util.PdfUtils;
 import stirling.software.proprietary.model.api.ai.AiPdfContentType;
@@ -44,6 +45,7 @@ public class PdfContentExtractor {
 
     private final TabulaTableParser tabulaTableParser;
     private final PdfIngester pdfIngester;
+    private final PyMuPdfConverter pyMuPdfConverter;
 
     private static final int MAX_CHARACTERS_PER_PAGE = 4_000;
 
@@ -190,6 +192,8 @@ public class PdfContentExtractor {
                             extractText(lf, fileReq, remainingPages, remainingCharacters));
             case PAGE_LAYOUT ->
                     Optional.<PdfContentResult>ofNullable(extractPageLayout(lf, remainingPages));
+            case PYMUPDF_MARKDOWN ->
+                    Optional.<PdfContentResult>ofNullable(extractPyMuPdfMarkdown(lf));
             default -> {
                 log.warn(
                         "Content type {} not yet implemented, skipping for {}",
@@ -255,6 +259,11 @@ public class PdfContentExtractor {
                 artifact.setFiles(results.stream().map(PageLayoutFileResult.class::cast).toList());
                 yield artifact;
             }
+            case PYMUPDF_MARKDOWN -> {
+                PyMuPdfMarkdownArtifact artifact = new PyMuPdfMarkdownArtifact();
+                artifact.setFiles(results.stream().map(PyMuPdfMarkdownResult.class::cast).toList());
+                yield artifact;
+            }
             case TOOL_REPORT ->
                     throw new IllegalArgumentException(
                             "TOOL_REPORT artifacts are not produced by PdfContentExtractor");
@@ -370,7 +379,8 @@ public class PdfContentExtractor {
     enum ArtifactKind {
         EXTRACTED_TEXT("extracted_text"),
         PAGE_LAYOUT("page_layout"),
-        TOOL_REPORT("tool_report");
+        TOOL_REPORT("tool_report"),
+        PYMUPDF_MARKDOWN("pymupdf_markdown");
 
         private final String value;
 
@@ -469,4 +479,46 @@ public class PdfContentExtractor {
         private final ArtifactKind kind = ArtifactKind.PAGE_LAYOUT;
         private List<PageLayoutFileResult> files = new ArrayList<>();
     }
+
+    private PyMuPdfMarkdownResult extractPyMuPdfMarkdown(LoadedFile lf) {
+        try {
+            log.info("[pymupdf-convert] converting file={}", lf.fileName());
+            java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();
+            lf.document().save(baos);
+            String markdown = pyMuPdfConverter.convertToMarkdown(baos.toByteArray(), lf.fileName());
+            log.info(
+                    "[pymupdf-convert] success file={} markdown-chars={}",
+                    lf.fileName(),
+                    markdown.length());
+            PyMuPdfMarkdownResult result = new PyMuPdfMarkdownResult();
+            result.setFileName(lf.fileName());
+            result.setMarkdown(markdown);
+            return result;
+        } catch (Exception e) {
+            log.warn(
+                    "[pymupdf-convert] failed for file={}, falling back to page layout: {}",
+                    lf.fileName(),
+                    e.getMessage());
+            return null;
+        }
+    }
+
+    /** PyMuPDF worker pre-rendered Markdown for one file. */
+    @Data
+    static final class PyMuPdfMarkdownResult implements PdfContentResult {
+        private String fileName;
+        private String markdown;
+
+        @Override
+        public ArtifactKind getArtifactKind() {
+            return ArtifactKind.PYMUPDF_MARKDOWN;
+        }
+    }
+
+    /** Artifact carrying PyMuPDF-rendered Markdown for all input files. */
+    @Data
+    static final class PyMuPdfMarkdownArtifact implements WorkflowArtifact {
+        private final ArtifactKind kind = ArtifactKind.PYMUPDF_MARKDOWN;
+        private List<PyMuPdfMarkdownResult> files = new ArrayList<>();
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/config/ClusterStorageGate.java

@@ -0,0 +1,95 @@
+package stirling.software.proprietary.storage.config;
+
+import java.util.Locale;
+import java.util.Optional;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Configuration;
+
+import jakarta.annotation.PostConstruct;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.configuration.ee.LicenseKeyChecker;
+
+/**
+ * Fails fast at boot if cluster mode is enabled with node-local storage. Validates both {@code
+ * storage.provider} (persistent uploads) and {@code cluster.artifactStore} (transient job-result
+ * files): neither may be {@code local} when {@code cluster.enabled=true}. Additionally enforces
+ * that any S3-backed configuration ({@code storage.provider=s3} or {@code
+ * cluster.artifactStore=s3}) is accompanied by a valid Pro / Enterprise license.
+ */
+@Configuration
+@RequiredArgsConstructor
+@Slf4j
+public class ClusterStorageGate {
+
+    private final ApplicationProperties applicationProperties;
+    private final LicenseKeyChecker licenseKeyChecker;
+
+    @Value("${cluster.enabled:false}")
+    private boolean clusterEnabled;
+
+    @Value("${cluster.artifactStore:local}")
+    private String clusterArtifactStore;
+
+    @PostConstruct
+    void validate() {
+        // License enforcement runs regardless of cluster.enabled: even a single-node setup that
+        // selects a remote backend must hold a Pro or higher license.
+        ApplicationProperties.Storage storage = applicationProperties.getStorage();
+        if (storage != null && storage.isEnabled()) {
+            String provider = normalize(storage.getProvider());
+            if ("s3".equals(provider) || "database".equals(provider)) {
+                licenseKeyChecker.requireProOrEnterprise("storage.provider=" + provider);
+            }
+        }
+        if ("s3".equals(normalize(clusterArtifactStore))) {
+            licenseKeyChecker.requireProOrEnterprise("cluster.artifactStore=s3");
+        }
+
+        if (!clusterEnabled) {
+            return;
+        }
+        if (storage != null && storage.isEnabled()) {
+            validate(
+                    "storage.provider",
+                    storage.getProvider(),
+                    "Local filesystem storage cannot be shared across cluster nodes."
+                            + " Configure storage.provider=s3 (with storage.s3.bucket /"
+                            + " endpoint / credentials) or storage.provider=database before"
+                            + " enabling clustering.");
+        }
+        validate(
+                "cluster.artifactStore",
+                clusterArtifactStore,
+                "Per-node disk cannot back transient job-result files in a multi-node"
+                        + " deployment; downloads would 404 whenever the load balancer routes"
+                        + " a follow-up request to a different node. Configure"
+                        + " cluster.artifactStore=s3 (reuses storage.s3.* config)"
+                        + " before enabling clustering.");
+    }
+
+    private static String normalize(String value) {
+        return Optional.ofNullable(value).orElse("local").trim().toLowerCase(Locale.ROOT);
+    }
+
+    private static void validate(String propertyName, String configuredValue, String remediation) {
+        String normalized =
+                Optional.ofNullable(configuredValue)
+                        .orElse("local")
+                        .trim()
+                        .toLowerCase(Locale.ROOT);
+        if ("local".equals(normalized)) {
+            throw new IllegalStateException(
+                    "Cluster mode (cluster.enabled=true) is incompatible with "
+                            + propertyName
+                            + "=local. "
+                            + remediation);
+        }
+        log.info(
+                "Cluster storage gate: clusterEnabled=true, {}={} -> OK", propertyName, normalized);
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/config/StorageProviderConfig.java

@@ -15,8 +15,11 @@ import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.common.configuration.InstallationPathConfig;
 import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.cluster.s3.S3Clients;
+import stirling.software.proprietary.security.configuration.ee.LicenseKeyChecker;
 import stirling.software.proprietary.storage.provider.DatabaseStorageProvider;
 import stirling.software.proprietary.storage.provider.LocalStorageProvider;
+import stirling.software.proprietary.storage.provider.S3StorageProvider;
 import stirling.software.proprietary.storage.provider.StorageProvider;
 import stirling.software.proprietary.storage.repository.StoredFileBlobRepository;
 
@@ -27,8 +30,9 @@ public class StorageProviderConfig {
 
     private final ApplicationProperties applicationProperties;
     private final StoredFileBlobRepository storedFileBlobRepository;
+    private final LicenseKeyChecker licenseKeyChecker;
 
-    @Bean
+    @Bean(destroyMethod = "close")
     public StorageProvider storageProvider() {
         boolean storageEnabled = applicationProperties.getStorage().isEnabled();
         String providerName =
@@ -37,8 +41,13 @@ public class StorageProviderConfig {
                         .trim()
                         .toLowerCase(Locale.ROOT);
         if ("database".equals(providerName)) {
+            licenseKeyChecker.requireProOrEnterprise("storage.provider=database");
             return new DatabaseStorageProvider(storedFileBlobRepository);
         }
+        if ("s3".equals(providerName)) {
+            licenseKeyChecker.requireProOrEnterprise("storage.provider=s3");
+            return buildS3Provider(applicationProperties.getStorage().getS3());
+        }
         if (!"local".equals(providerName)) {
             throw new IllegalStateException("Storage provider not supported: " + providerName);
         }
@@ -71,4 +80,9 @@ public class StorageProviderConfig {
         }
         return new LocalStorageProvider(basePath);
     }
+
+    private S3StorageProvider buildS3Provider(ApplicationProperties.Storage.S3 cfg) {
+        S3Clients.Bundle bundle = S3Clients.build(cfg, "storage provider");
+        return new S3StorageProvider(bundle.client(), bundle.presigner(), cfg.getBucket());
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/controller/FileFolderPlacementController.java

@@ -0,0 +1,91 @@
+package stirling.software.proprietary.storage.controller;
+
+import java.util.List;
+import java.util.UUID;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.RequiredArgsConstructor;
+
+import stirling.software.proprietary.storage.service.FolderService;
+
+/**
+ * Folder placement endpoints for existing stored files. Thin adapter: validates the request shape,
+ * delegates the transaction to {@link FolderService}, then maps the result onto the HTTP status.
+ * Authentication, storage-gate, ownership checks, and the bulk cap all live on the service (where
+ * {@code @Transactional} also lives) so the JDBC connection isn't held through JSON serialization.
+ */
+@RestController
+@RequestMapping("/api/v1/storage/files")
+@RequiredArgsConstructor
+public class FileFolderPlacementController {
+
+    private static final int BULK_MOVE_MAX_FILES = 1000;
+
+    private final FolderService folderService;
+
+    /** Move a single file to a folder (or to root when folderId is null). */
+    @PatchMapping("/{fileId}/folder")
+    public ResponseEntity<Void> moveFileToFolder(
+            @PathVariable Long fileId, @Valid @RequestBody FolderPlacement body) {
+        folderService.moveFileToFolder(fileId, body.getFolderId());
+        return ResponseEntity.noContent().build();
+    }
+
+    /**
+     * Bulk move - fewer round-trips than calling the single endpoint N times. Returns 200 on full
+     * success, 207 (Multi-Status) when some files were skipped (typically because they don't belong
+     * to the caller).
+     */
+    @PatchMapping("/folder")
+    public ResponseEntity<BulkMoveResponse> bulkMove(@Valid @RequestBody BulkMoveRequest body) {
+        FolderService.BulkMoveResult result =
+                folderService.bulkMoveFilesToFolder(body.getFolderId(), body.getFileIds());
+        HttpStatus status =
+                result.skippedFileIds().isEmpty() ? HttpStatus.OK : HttpStatus.MULTI_STATUS;
+        return ResponseEntity.status(status)
+                .body(new BulkMoveResponse(result.movedFileIds(), result.skippedFileIds()));
+    }
+
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class FolderPlacement {
+        private UUID folderId;
+    }
+
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class BulkMoveRequest {
+        private UUID folderId;
+
+        @NotNull
+        @Size(
+                min = 1,
+                max = BULK_MOVE_MAX_FILES,
+                message = "fileIds must contain between 1 and 1000 entries")
+        private List<Long> fileIds;
+    }
+
+    @Data
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class BulkMoveResponse {
+        private List<Long> movedFileIds;
+        private List<Long> skippedFileIds;
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/controller/FileStorageController.java

@@ -1,7 +1,11 @@
 package stirling.software.proprietary.storage.controller;
 
+import java.io.IOException;
+import java.net.URI;
+import java.time.Duration;
 import java.util.List;
 import java.util.Locale;
+import java.util.Optional;
 
 import org.springframework.http.ContentDisposition;
 import org.springframework.http.HttpHeaders;
@@ -25,6 +29,7 @@ import org.springframework.web.server.ResponseStatusException;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 import stirling.software.proprietary.security.model.User;
 import stirling.software.proprietary.storage.model.FileShare;
@@ -35,17 +40,22 @@ import stirling.software.proprietary.storage.model.api.ShareLinkMetadataResponse
 import stirling.software.proprietary.storage.model.api.ShareLinkResponse;
 import stirling.software.proprietary.storage.model.api.ShareWithUserRequest;
 import stirling.software.proprietary.storage.model.api.StoredFileResponse;
+import stirling.software.proprietary.storage.provider.StorageProvider;
 import stirling.software.proprietary.storage.service.FileStorageService;
 
 @RestController
 @RequestMapping("/api/v1/storage")
 @RequiredArgsConstructor
+@Slf4j
 @Tag(
         name = "File Storage",
         description = "Stored file management, sharing, and share link operations")
 public class FileStorageController {
 
+    private static final Duration SIGNED_URL_TTL = Duration.ofMinutes(5);
+
     private final FileStorageService fileStorageService;
+    private final StorageProvider storageProvider;
 
     @PostMapping(
             value = "/files",
@@ -91,7 +101,9 @@ public class FileStorageController {
         User user = fileStorageService.requireAuthenticatedUser();
         StoredFile file = fileStorageService.getAccessibleFile(user, fileId);
         fileStorageService.requireReadAccess(user, file);
-        return buildFileResponse(file, inline);
+        Optional<ResponseEntity<org.springframework.core.io.Resource>> redirect =
+                tryRedirectToSignedUrl(file, inline);
+        return redirect.orElseGet(() -> buildFileResponse(file, inline));
     }
 
     @DeleteMapping("/files/{fileId}")
@@ -189,7 +201,9 @@ public class FileStorageController {
         fileStorageService.requireReadAccess(share);
         fileStorageService.recordShareAccess(share, authentication, inline);
         StoredFile file = share.getFile();
-        return buildFileResponse(file, inline);
+        Optional<ResponseEntity<org.springframework.core.io.Resource>> redirect =
+                tryRedirectToSignedUrl(file, inline);
+        return redirect.orElseGet(() -> buildFileResponse(file, inline));
     }
 
     @GetMapping("/share-links/{token}/metadata")
@@ -272,4 +286,34 @@ public class FileStorageController {
                 && authentication.isAuthenticated()
                 && !"anonymousUser".equals(authentication.getPrincipal());
     }
+
+    private Optional<ResponseEntity<org.springframework.core.io.Resource>> tryRedirectToSignedUrl(
+            StoredFile file, boolean inline) {
+        if (file == null || file.getStorageKey() == null || file.getStorageKey().isBlank()) {
+            return Optional.empty();
+        }
+        try {
+            Optional<URI> signed =
+                    storageProvider.signedDownloadUrl(
+                            file.getStorageKey(),
+                            SIGNED_URL_TTL,
+                            inline,
+                            file.getOriginalFilename());
+            if (signed.isEmpty()) {
+                return Optional.empty();
+            }
+            HttpHeaders headers = new HttpHeaders();
+            headers.setLocation(signed.get());
+            ResponseEntity<org.springframework.core.io.Resource> response =
+                    ResponseEntity.status(HttpStatus.FOUND).headers(headers).build();
+            return Optional.of(response);
+        } catch (IOException e) {
+            log.warn(
+                    "Failed to create signed download URL for file {} (key: {}), falling back to streaming",
+                    file.getId(),
+                    file.getStorageKey(),
+                    e);
+            return Optional.empty();
+        }
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/controller/FolderController.java

@@ -0,0 +1,70 @@
+package stirling.software.proprietary.storage.controller;
+
+import java.net.URI;
+import java.util.List;
+import java.util.UUID;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import jakarta.validation.Valid;
+
+import lombok.RequiredArgsConstructor;
+
+import stirling.software.proprietary.storage.model.api.CreateFolderRequest;
+import stirling.software.proprietary.storage.model.api.FolderResponse;
+import stirling.software.proprietary.storage.model.api.UpdateFolderRequest;
+import stirling.software.proprietary.storage.service.FolderService;
+
+/**
+ * REST endpoints for user-owned folders. Phase A - no folder-level sharing yet (Phase 3).
+ *
+ * <p>All operations are scoped to the authenticated user; existing single-file storage endpoints in
+ * {@link FileStorageController} are left alone so the cert-signing and standard upload flows are
+ * unaffected.
+ */
+@RestController
+@RequestMapping("/api/v1/storage/folders")
+@RequiredArgsConstructor
+public class FolderController {
+
+    private final FolderService folderService;
+
+    @GetMapping
+    public List<FolderResponse> listFolders() {
+        return folderService.listFolders();
+    }
+
+    @PostMapping
+    public ResponseEntity<FolderResponse> createFolder(
+            @Valid @RequestBody CreateFolderRequest request) {
+        FolderResponse response = folderService.createFolder(request);
+        // 201 Created with Location header - conventional REST. The idempotent re-return path
+        // (same id resubmitted) also lands here; treating it as 201 keeps wire semantics simple.
+        return ResponseEntity.status(HttpStatus.CREATED)
+                .location(URI.create("/api/v1/storage/folders/" + response.id()))
+                .body(response);
+    }
+
+    @PatchMapping("/{folderId}")
+    public ResponseEntity<FolderResponse> updateFolder(
+            @PathVariable UUID folderId, @Valid @RequestBody UpdateFolderRequest request) {
+        return ResponseEntity.ok(folderService.updateFolder(folderId, request));
+    }
+
+    @DeleteMapping("/{folderId}")
+    public ResponseEntity<DeleteFolderResponse> deleteFolder(@PathVariable UUID folderId) {
+        List<UUID> removed = folderService.deleteFolder(folderId);
+        return ResponseEntity.ok(new DeleteFolderResponse(removed));
+    }
+
+    public record DeleteFolderResponse(List<UUID> removedFolderIds) {}
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/Folder.java

@@ -0,0 +1,104 @@
+package stirling.software.proprietary.storage.model;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Index;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.persistence.Version;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+import stirling.software.proprietary.security.model.User;
+
+/**
+ * A user-owned folder used by the file manager UI to organise stored files. Phase A entity - no
+ * folder-level sharing yet (Phase 3).
+ *
+ * <p>The id is a UUID rather than a numeric auto-increment so it round-trips with the
+ * client-generated {@code FolderId} and survives cross-device sync without re-keying.
+ */
+@Entity
+@Table(
+        name = "folders",
+        indexes = {
+            @Index(name = "idx_folders_owner", columnList = "owner_id"),
+            @Index(name = "idx_folders_parent", columnList = "parent_folder_id"),
+            @Index(name = "idx_folders_owner_parent", columnList = "owner_id, parent_folder_id")
+        })
+@NoArgsConstructor
+@Getter
+@Setter
+public class Folder implements Serializable {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Dialect-portable UUID column. The previous {@code columnDefinition = "uuid"} was
+     * Postgres-specific and broke on H2/MariaDB. Hibernate's {@code UUID} mapping picks the right
+     * native type per dialect (BINARY(16) on H2/MariaDB, uuid on Postgres) when no explicit
+     * columnDefinition is set.
+     */
+    @Id
+    @Column(name = "folder_id", nullable = false)
+    private UUID id;
+
+    /**
+     * {@code OnDeleteAction.CASCADE} so deleting the owning {@code User} cascades to this row at
+     * the DB level - UserService.deleteUserRelatedData doesn't enumerate folders today, and leaving
+     * the FK without an action throws a constraint violation on user delete.
+     */
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "owner_id", nullable = false)
+    @OnDelete(action = OnDeleteAction.CASCADE)
+    private User owner;
+
+    /**
+     * Parent folder; null = root. {@code OnDeleteAction.CASCADE} so a backend-side parent delete
+     * cleans children automatically, matching the service-layer recursive-delete contract.
+     */
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "parent_folder_id")
+    @OnDelete(action = OnDeleteAction.CASCADE)
+    private Folder parent;
+
+    @Column(name = "name", nullable = false, length = 255)
+    private String name;
+
+    @Column(name = "color", length = 32)
+    private String color;
+
+    @Column(name = "icon", length = 64)
+    private String icon;
+
+    /**
+     * Optimistic-locking version. Cross-PC sync without this lets last-write-win silently. The
+     * column is nullable so existing rows from a pre-version deployment can be backfilled by
+     * Hibernate's update-on-write rather than failing the ddl-auto upgrade.
+     */
+    @Version
+    @Column(name = "version")
+    private Long version;
+
+    @CreationTimestamp
+    @Column(name = "created_at", updatable = false)
+    private LocalDateTime createdAt;
+
+    @UpdateTimestamp
+    @Column(name = "updated_at")
+    private LocalDateTime updatedAt;
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/StoredFile.java

@@ -6,6 +6,8 @@ import java.util.HashSet;
 import java.util.Set;
 
 import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.OnDelete;
+import org.hibernate.annotations.OnDeleteAction;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import jakarta.persistence.CascadeType;
@@ -35,7 +37,8 @@ import stirling.software.proprietary.workflow.model.WorkflowSession;
         name = "stored_files",
         indexes = {
             @Index(name = "idx_stored_files_owner", columnList = "owner_id"),
-            @Index(name = "idx_stored_files_workflow", columnList = "workflow_session_id")
+            @Index(name = "idx_stored_files_workflow", columnList = "workflow_session_id"),
+            @Index(name = "idx_stored_files_folder", columnList = "folder_id")
         })
 @NoArgsConstructor
 @Getter
@@ -106,6 +109,20 @@ public class StoredFile implements Serializable {
             orphanRemoval = true)
     private Set<FileShare> shares = new HashSet<>();
 
+    /**
+     * Optional folder placement for the file manager UI. Null = root. Hibernate ddl-auto will add
+     * this as a nullable column on upgrade so existing records continue to work untouched.
+     *
+     * <p>{@code OnDeleteAction.SET_NULL} so any backend that drops a folder row (admin script,
+     * future cleanup job, cascading user delete) cleanly orphans files to root rather than leaving
+     * dangling FK references. The application path ({@code FolderRepository.clearFolderForFiles})
+     * still runs first as a belt-and-braces.
+     */
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "folder_id")
+    @OnDelete(action = OnDeleteAction.SET_NULL)
+    private Folder folder;
+
     @CreationTimestamp
     @Column(name = "created_at", updatable = false)
     private LocalDateTime createdAt;

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/api/CreateFolderRequest.java

@@ -0,0 +1,43 @@
+package stirling.software.proprietary.storage.model.api;
+
+import java.util.UUID;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class CreateFolderRequest {
+
+    /**
+     * Client-generated UUID - lets the caller round-trip the same id it stored locally. Optional;
+     * the server generates one when missing.
+     */
+    private UUID id;
+
+    @NotBlank
+    @Size(max = 255)
+    private String name;
+
+    private UUID parentFolderId;
+
+    /** Hex colour string (#rrggbb or #rrggbbaa) - matches the frontend palette format. */
+    @Size(max = 32)
+    @Pattern(
+            regexp = "^#[0-9a-fA-F]{6}([0-9a-fA-F]{2})?$",
+            message = "color must be a #RRGGBB or #RRGGBBAA hex value")
+    private String color;
+
+    /** Icon identifier - lowercase alphanumerics, hyphens, underscores only. */
+    @Size(max = 64)
+    @Pattern(
+            regexp = "^[a-z0-9_-]+$",
+            message = "icon must be a lowercase id (a-z, 0-9, '-' or '_')")
+    private String icon;
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/api/FolderResponse.java

@@ -0,0 +1,38 @@
+package stirling.software.proprietary.storage.model.api;
+
+import java.time.LocalDateTime;
+import java.util.UUID;
+
+import stirling.software.proprietary.storage.model.Folder;
+
+/**
+ * Outbound DTO for folder responses. Records are immutable, value-equality-based, and far less
+ * accident-prone than a {@code @Data} class with public setters.
+ */
+public record FolderResponse(
+        UUID id,
+        String name,
+        UUID parentFolderId,
+        String color,
+        String icon,
+        Long version,
+        LocalDateTime createdAt,
+        LocalDateTime updatedAt) {
+
+    public static FolderResponse from(Folder folder) {
+        // {@code folder.getParent().getId()} on a lazy proxy returns the FK value cached at the
+        // join column WITHOUT initialising the proxy under standard Hibernate, so this does
+        // not N+1. If a future Hibernate update changes that, switch the JPQL list query to a
+        // constructor projection.
+        UUID parentId = folder.getParent() == null ? null : folder.getParent().getId();
+        return new FolderResponse(
+                folder.getId(),
+                folder.getName(),
+                parentId,
+                folder.getColor(),
+                folder.getIcon(),
+                folder.getVersion(),
+                folder.getCreatedAt(),
+                folder.getUpdatedAt());
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/api/StoredFileResponse.java

@@ -2,6 +2,7 @@ package stirling.software.proprietary.storage.model.api;
 
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.UUID;
 
 import lombok.Builder;
 import lombok.Getter;
@@ -22,4 +23,10 @@ public class StoredFileResponse {
     private final List<SharedUserResponse> sharedUsers;
     private final List<ShareLinkResponse> shareLinks;
     private final String filePurpose;
+
+    /**
+     * Optional folder placement (Phase A). Null when the file lives at the root or when the server
+     * build doesn't have the folders feature enabled - existing clients should treat null as root.
+     */
+    private final UUID folderId;
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/model/api/UpdateFolderRequest.java

@@ -0,0 +1,58 @@
+package stirling.software.proprietary.storage.model.api;
+
+import java.util.UUID;
+
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * PATCH-style update - every field is optional. Send only the fields you want to change.
+ *
+ * <p>The {@code reparent} flag distinguishes "do not change parent" from "move to root" since
+ * {@code parentFolderId == null} alone is ambiguous in a sparse body. We use a boxed {@link
+ * Boolean} so a missing field deserialises to {@code null} (= "do not reparent") rather than to
+ * primitive {@code false}, removing a class of "I PATCHed only the name but the server reset my
+ * parent" footguns.
+ *
+ * <p>When the trimmed name is empty (e.g. {@code " "}) the service rejects the request with HTTP
+ * 400 - silent drops are too easy to mistake for a successful rename.
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class UpdateFolderRequest {
+
+    /** When provided, must contain at least one non-whitespace character. */
+    @Size(max = 255)
+    @Pattern(regexp = "\\S.*", message = "name must not be blank")
+    private String name;
+
+    private Boolean reparent;
+    private UUID parentFolderId;
+
+    @Size(max = 32)
+    @Pattern(
+            regexp = "^(|#[0-9a-fA-F]{6}([0-9a-fA-F]{2})?)$",
+            message = "color must be empty or a #RRGGBB / #RRGGBBAA hex value")
+    private String color;
+
+    @Size(max = 64)
+    @Pattern(
+            regexp = "^([a-z0-9_-]+)?$",
+            message = "icon must be a lowercase id (a-z, 0-9, '-' or '_') or empty")
+    private String icon;
+
+    /**
+     * Convenience accessor - treats null as "do not reparent". Named differently from the
+     * Lombok-generated {@code getReparent()} so callers don't accidentally use one for the other
+     * (the getter is nullable {@code Boolean}; this method collapses to primitive).
+     */
+    @com.fasterxml.jackson.annotation.JsonIgnore
+    public boolean shouldReparent() {
+        return Boolean.TRUE.equals(reparent);
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/provider/LocalStorageProvider.java

@@ -24,6 +24,9 @@ public class LocalStorageProvider implements StorageProvider {
 
     @Override
     public StoredObject store(User owner, MultipartFile file) throws IOException {
+        if (owner == null || owner.getId() == null) {
+            throw new IllegalArgumentException("owner.id is required for local storage key");
+        }
         String originalFilename = sanitizeFilename(file.getOriginalFilename());
         String storageKey =
                 owner.getId()
@@ -77,6 +80,7 @@ public class LocalStorageProvider implements StorageProvider {
         if (filename == null || filename.isBlank()) {
             return "file";
         }
-        return Paths.get(filename).getFileName().toString();
+        String stripped = Paths.get(filename).getFileName().toString().replaceAll("\\p{Cntrl}", "");
+        return stripped.isBlank() ? "file" : stripped;
     }
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/provider/S3StorageProvider.java

@@ -0,0 +1,190 @@
+package stirling.software.proprietary.storage.provider;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Paths;
+import java.time.Duration;
+import java.util.Optional;
+import java.util.UUID;
+
+import org.springframework.core.io.InputStreamResource;
+import org.springframework.core.io.Resource;
+import org.springframework.web.multipart.MultipartFile;
+
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.proprietary.security.model.User;
+
+import software.amazon.awssdk.core.ResponseInputStream;
+import software.amazon.awssdk.core.exception.SdkException;
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectResponse;
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException;
+import software.amazon.awssdk.services.s3.model.PutObjectRequest;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
+import software.amazon.awssdk.services.s3.presigner.model.PresignedGetObjectRequest;
+
+/** {@link StorageProvider} backed by an S3-compatible object store. */
+@Slf4j
+public class S3StorageProvider implements StorageProvider, AutoCloseable {
+
+    private final S3Client s3Client;
+    private final S3Presigner s3Presigner;
+    private final String bucket;
+
+    public S3StorageProvider(S3Client s3Client, S3Presigner s3Presigner, String bucket) {
+        if (bucket == null || bucket.isBlank()) {
+            throw new IllegalArgumentException("S3 bucket must be configured");
+        }
+        this.s3Client = s3Client;
+        this.s3Presigner = s3Presigner;
+        this.bucket = bucket;
+    }
+
+    @Override
+    public StoredObject store(User owner, MultipartFile file) throws IOException {
+        if (owner == null || owner.getId() == null) {
+            throw new IllegalArgumentException("owner.id is required for S3 storage key");
+        }
+        String originalFilename = sanitizeFilename(file.getOriginalFilename());
+        // Key is opaque ({ownerId}/{uuid}) so non-ASCII filenames don't break vendors that
+        // restrict key charset (e.g. Supabase Storage returns 400 Invalid key on unicode).
+        // The display name is preserved in StoredObject.originalFilename and the DB row.
+        String storageKey = owner.getId() + "/" + UUID.randomUUID();
+
+        PutObjectRequest.Builder request =
+                PutObjectRequest.builder().bucket(bucket).key(storageKey);
+        if (file.getContentType() != null && !file.getContentType().isBlank()) {
+            request.contentType(file.getContentType());
+        }
+        try (InputStream inputStream = file.getInputStream()) {
+            s3Client.putObject(
+                    request.build(), RequestBody.fromInputStream(inputStream, file.getSize()));
+        } catch (SdkException e) {
+            throw new IOException("Failed to upload object to S3", e);
+        }
+
+        return StoredObject.builder()
+                .storageKey(storageKey)
+                .originalFilename(originalFilename)
+                .contentType(file.getContentType())
+                .sizeBytes(file.getSize())
+                .build();
+    }
+
+    @Override
+    public Resource load(String storageKey) throws IOException {
+        GetObjectRequest request =
+                GetObjectRequest.builder().bucket(bucket).key(storageKey).build();
+        try {
+            ResponseInputStream<GetObjectResponse> stream = s3Client.getObject(request);
+            long contentLength =
+                    stream.response().contentLength() != null
+                            ? stream.response().contentLength()
+                            : -1;
+            return new InputStreamResource(stream) {
+                @Override
+                public long contentLength() {
+                    return contentLength;
+                }
+            };
+        } catch (NoSuchKeyException e) {
+            throw new IOException("File not found", e);
+        } catch (SdkException e) {
+            throw new IOException("Failed to load object from S3", e);
+        }
+    }
+
+    @Override
+    public void delete(String storageKey) throws IOException {
+        try {
+            s3Client.deleteObject(
+                    DeleteObjectRequest.builder().bucket(bucket).key(storageKey).build());
+        } catch (SdkException e) {
+            throw new IOException("Failed to delete object from S3", e);
+        }
+    }
+
+    @Override
+    public Optional<URI> signedDownloadUrl(String storageKey, Duration ttl) throws IOException {
+        return signedDownloadUrl(storageKey, ttl, false, null);
+    }
+
+    @Override
+    public Optional<URI> signedDownloadUrl(
+            String storageKey, Duration ttl, boolean inline, String originalFilename)
+            throws IOException {
+        if (storageKey == null || storageKey.isBlank()) {
+            return Optional.empty();
+        }
+        Duration effectiveTtl =
+                ttl == null || ttl.isZero() || ttl.isNegative() ? Duration.ofMinutes(5) : ttl;
+        try {
+            GetObjectRequest.Builder getBuilder =
+                    GetObjectRequest.builder().bucket(bucket).key(storageKey);
+            String disposition = buildContentDisposition(inline, originalFilename);
+            if (disposition != null) {
+                getBuilder.responseContentDisposition(disposition);
+            }
+            GetObjectPresignRequest presignRequest =
+                    GetObjectPresignRequest.builder()
+                            .signatureDuration(effectiveTtl)
+                            .getObjectRequest(getBuilder.build())
+                            .build();
+            PresignedGetObjectRequest presigned = s3Presigner.presignGetObject(presignRequest);
+            return Optional.of(presigned.url().toURI());
+        } catch (SdkException | URISyntaxException e) {
+            log.warn("Failed to create presigned S3 GET URL for key {}", storageKey, e);
+            return Optional.empty();
+        }
+    }
+
+    // Returns null when originalFilename is blank; S3 falls back to its own default in that case.
+    static String buildContentDisposition(boolean inline, String originalFilename) {
+        if (originalFilename == null || originalFilename.isBlank()) {
+            return null;
+        }
+        // Strip CR/LF and other control chars before path parsing (Paths.get throws on them on
+        // Windows, and they defeat header parsers).
+        String stripped = originalFilename.replaceAll("\\p{Cntrl}", "");
+        // Use only the basename to avoid leaking directory structure into the header.
+        int lastSeparator = Math.max(stripped.lastIndexOf('/'), stripped.lastIndexOf('\\'));
+        if (lastSeparator >= 0) {
+            stripped = stripped.substring(lastSeparator + 1);
+        }
+        if (stripped.isBlank()) {
+            return null;
+        }
+        // Escape per RFC 6266 quoted-string rules.
+        String escaped = stripped.replace("\\", "\\\\").replace("\"", "\\\"");
+        return (inline ? "inline" : "attachment") + "; filename=\"" + escaped + "\"";
+    }
+
+    @Override
+    public void close() {
+        try {
+            s3Presigner.close();
+        } catch (Exception e) {
+            log.warn("Error closing S3 presigner", e);
+        }
+        try {
+            s3Client.close();
+        } catch (Exception e) {
+            log.warn("Error closing S3 client", e);
+        }
+    }
+
+    private String sanitizeFilename(String filename) {
+        if (filename == null || filename.isBlank()) {
+            return "file";
+        }
+        String stripped = Paths.get(filename).getFileName().toString().replaceAll("\\p{Cntrl}", "");
+        return stripped.isBlank() ? "file" : stripped;
+    }
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/provider/StorageProvider.java

@@ -1,16 +1,45 @@
 package stirling.software.proprietary.storage.provider;
 
 import java.io.IOException;
+import java.net.URI;
+import java.time.Duration;
+import java.util.Optional;
 
 import org.springframework.core.io.Resource;
 import org.springframework.web.multipart.MultipartFile;
 
 import stirling.software.proprietary.security.model.User;
 
-public interface StorageProvider {
+public interface StorageProvider extends AutoCloseable {
     StoredObject store(User owner, MultipartFile file) throws IOException;
 
     Resource load(String storageKey) throws IOException;
 
     void delete(String storageKey) throws IOException;
+
+    /**
+     * Releases any backend-specific resources. Default no-op so {@link LocalStorageProvider} and
+     * {@link DatabaseStorageProvider} (which hold no closeable handles) satisfy Spring's
+     * {@code @Bean(destroyMethod = "close")} signature requirement without ceremony. {@code
+     * S3StorageProvider} overrides this to close the underlying SDK client + presigner.
+     */
+    @Override
+    default void close() {}
+
+    /**
+     * Returns a presigned download URL valid for {@code ttl}, or {@link Optional#empty()} if the
+     * provider does not support signed URLs (callers fall back to {@link #load(String)}).
+     */
+    default Optional<URI> signedDownloadUrl(String storageKey, Duration ttl) throws IOException {
+        return signedDownloadUrl(storageKey, ttl, false, null);
+    }
+
+    /**
+     * Like {@link #signedDownloadUrl(String, Duration)} with explicit Content-Disposition control.
+     */
+    default Optional<URI> signedDownloadUrl(
+            String storageKey, Duration ttl, boolean inline, String originalFilename)
+            throws IOException {
+        return Optional.empty();
+    }
 }

app/proprietary/src/main/java/stirling/software/proprietary/storage/repository/FolderRepository.java

@@ -0,0 +1,35 @@
+package stirling.software.proprietary.storage.repository;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import stirling.software.proprietary.security.model.User;
+import stirling.software.proprietary.storage.model.Folder;
+
+public interface FolderRepository extends JpaRepository<Folder, UUID> {
+
+    Optional<Folder> findByIdAndOwner(UUID id, User owner);
+
+    List<Folder> findAllByOwnerOrderByName(User owner);
+
+    long countByOwner(User owner);
+
+    /**
+     * Clear the folder reference on every file currently inside any of the given folders. Used when
+     * a folder subtree is deleted - files fall back to the root rather than dangling.
+     *
+     * <p>{@code flushAutomatically + clearAutomatically} forces Hibernate to flush any cached dirty
+     * {@code StoredFile} entities before the bulk UPDATE runs, and clears the persistence context
+     * afterwards so a subsequent {@code deleteAllByIdInBatch} on the parent folders doesn't see
+     * stale entity state referencing the about-to-be-deleted folder.
+     */
+    @Modifying(flushAutomatically = true, clearAutomatically = true)
+    @Query("UPDATE StoredFile sf SET sf.folder = null WHERE sf.folder.id IN :folderIds")
+    void clearFolderForFiles(@Param("folderIds") List<UUID> folderIds);
+}

app/proprietary/src/main/java/stirling/software/proprietary/storage/repository/StoredFileRepository.java

@@ -59,6 +59,13 @@ public interface StoredFileRepository extends JpaRepository<StoredFile, Long> {
 
     List<StoredFile> findAllByOwner(User owner);
 
+    /**
+     * Bulk lookup used by the folder-placement controller. Returns only files owned by {@code
+     * owner}; ids that don't exist or that belong to another user are silently dropped so the
+     * caller can compute the "skipped" set by subtraction.
+     */
+    List<StoredFile> findAllByIdInAndOwner(List<Long> ids, User owner);
+
     @Modifying
     @Transactional
     @Query(

app/proprietary/src/main/java/stirling/software/proprietary/storage/service/FileStorageService.java

@@ -459,6 +459,7 @@ public class FileStorageService {
                         file.getPurpose() != null
                                 ? file.getPurpose().name().toLowerCase(Locale.ROOT)
                                 : null)
+                .folderId(file.getFolder() != null ? file.getFolder().getId() : null)
                 .build();
     }
 

app/proprietary/src/main/java/stirling/software/proprietary/storage/service/FolderService.java

@@ -0,0 +1,417 @@
+package stirling.software.proprietary.storage.service;
+
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.Deque;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+import org.springframework.dao.DataIntegrityViolationException;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.server.ResponseStatusException;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.model.User;
+import stirling.software.proprietary.storage.model.Folder;
+import stirling.software.proprietary.storage.model.StoredFile;
+import stirling.software.proprietary.storage.model.api.CreateFolderRequest;
+import stirling.software.proprietary.storage.model.api.FolderResponse;
+import stirling.software.proprietary.storage.model.api.UpdateFolderRequest;
+import stirling.software.proprietary.storage.repository.FolderRepository;
+import stirling.software.proprietary.storage.repository.StoredFileRepository;
+
+/**
+ * Phase A folder operations. Each call is scoped to the authenticated user - folders are private to
+ * their owner. Folder-level sharing is a Phase 3 feature.
+ */
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class FolderService {
+
+    /**
+     * Hard cap on folders per user. Beyond this {@link #createFolder} rejects with 409 - guards
+     * against per-account folder-explosion DoS and bounds the in-memory subtree walk in {@link
+     * #deleteFolder}.
+     */
+    private static final long MAX_FOLDERS_PER_USER = 5_000L;
+
+    /**
+     * Hard cap on chain depth from the root to any folder. Bounds the lazy-proxy walk in {@link
+     * #enforceDepthAndCycle} - otherwise a user could build a chain up to MAX_FOLDERS_PER_USER deep
+     * and force one Hibernate SELECT per ancestor on every reparent (5,000+ SELECTs == seconds of
+     * DB time per request, per-account weaponizable as DoS).
+     */
+    private static final int MAX_FOLDER_DEPTH = 64;
+
+    /**
+     * Hard cap on bulk-move payload size, mirroring the request-validation cap on {@code
+     * FileFolderPlacementController.BulkMoveRequest.fileIds}. Re-asserted at the service layer
+     * because controller-level @Valid bounds aren't enforced when the service is called directly
+     * (e.g. by future internal callers or tests).
+     */
+    private static final int BULK_MOVE_MAX_FILES = 1000;
+
+    private final FolderRepository folderRepository;
+    private final StoredFileRepository storedFileRepository;
+    private final ApplicationProperties applicationProperties;
+
+    /**
+     * Gate every public method on storage being enabled, mirroring {@code
+     * FileStorageService.ensureStorageEnabled}. Without this, folder CRUD still works when {@code
+     * storage.enabled=false} or {@code security.enableLogin=false}, defeating the operator's intent
+     * to disable storage end-to-end.
+     */
+    private void ensureStorageEnabled() {
+        if (!applicationProperties.getSecurity().isEnableLogin()) {
+            throw new ResponseStatusException(
+                    HttpStatus.FORBIDDEN, "Storage requires login to be enabled");
+        }
+        if (!applicationProperties.getStorage().isEnabled()) {
+            throw new ResponseStatusException(HttpStatus.FORBIDDEN, "Storage is disabled");
+        }
+    }
+
+    /** List every folder owned by the current user, alphabetical. */
+    @Transactional(readOnly = true)
+    public List<FolderResponse> listFolders() {
+        ensureStorageEnabled();
+        User user = requireAuthenticatedUser();
+        return folderRepository.findAllByOwnerOrderByName(user).stream()
+                .map(FolderResponse::from)
+                .toList();
+    }
+
+    @Transactional
+    public FolderResponse createFolder(CreateFolderRequest request) {
+        ensureStorageEnabled();
+        User user = requireAuthenticatedUser();
+        // Reject self-parenting up-front. Without this, a client posting
+        // {id: X, parentFolderId: X} for a folder X they already own would silently
+        // get the existing folder back (idempotent path) and never learn that the
+        // parentFolderId they sent was ignored. For new ids the parent lookup would
+        // 404, but the message is misleading.
+        if (request.getId() != null && request.getId().equals(request.getParentFolderId())) {
+            throw new ResponseStatusException(
+                    HttpStatus.BAD_REQUEST, "A folder cannot be its own parent");
+        }
+        Folder parent = resolveParent(request.getParentFolderId(), user, null);
+
+        UUID id = request.getId() != null ? request.getId() : UUID.randomUUID();
+
+        // Idempotent: if this user already owns a folder with the supplied id, return it
+        // unchanged. Single fetch (the previous code did findByIdAndOwner twice with a race
+        // window between the two lookups).
+        java.util.Optional<Folder> existing = folderRepository.findByIdAndOwner(id, user);
+        if (existing.isPresent()) {
+            return FolderResponse.from(existing.get());
+        }
+
+        // The id is a global primary key. If the id exists for a *different* user, surfacing 500
+        // with a constraint-violation stack trace leaks far too much; convert to 409 Conflict so
+        // the caller can pick a fresh id.
+        if (folderRepository.existsById(id)) {
+            throw new ResponseStatusException(
+                    HttpStatus.CONFLICT,
+                    "A folder with this id already exists; choose a different id");
+        }
+
+        if (folderRepository.countByOwner(user) >= MAX_FOLDERS_PER_USER) {
+            throw new ResponseStatusException(
+                    HttpStatus.CONFLICT,
+                    "Folder limit reached (max " + MAX_FOLDERS_PER_USER + " per user)");
+        }
+
+        Folder folder = new Folder();
+        folder.setId(id);
+        folder.setOwner(user);
+        folder.setParent(parent);
+        folder.setName(request.getName().trim());
+        folder.setColor(request.getColor());
+        folder.setIcon(request.getIcon());
+
+        // saveAndFlush forces the INSERT now so @CreationTimestamp populates
+        // createdAt/updatedAt before we build the response. Plain save defers
+        // the SQL until @Transactional commit, and the response would carry
+        // null timestamps that the frontend trust-boundary parser then rejects.
+        Folder saved = folderRepository.saveAndFlush(folder);
+        log.info(
+                "Folder created: user={} id={} parent={}",
+                user.getId(),
+                saved.getId(),
+                parent == null ? "root" : parent.getId());
+        return FolderResponse.from(saved);
+    }
+
+    @Transactional
+    public FolderResponse updateFolder(UUID id, UpdateFolderRequest request) {
+        ensureStorageEnabled();
+        User user = requireAuthenticatedUser();
+        Folder folder = requireOwnedFolder(id, user);
+
+        if (request.getName() != null) {
+            String trimmed = request.getName().trim();
+            if (trimmed.isEmpty()) {
+                // Bean validation should already catch this via @Pattern, but be explicit so
+                // an empty-after-trim payload reaches the user as a 400 instead of being
+                // silently dropped.
+                throw new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST, "Folder name cannot be blank");
+            }
+            folder.setName(trimmed);
+        }
+
+        if (request.shouldReparent()) {
+            Folder newParent = resolveParent(request.getParentFolderId(), user, folder.getId());
+            folder.setParent(newParent);
+        }
+
+        if (request.getColor() != null) {
+            folder.setColor(request.getColor().isEmpty() ? null : request.getColor());
+        }
+
+        if (request.getIcon() != null) {
+            folder.setIcon(request.getIcon().isEmpty() ? null : request.getIcon());
+        }
+
+        // saveAndFlush so @UpdateTimestamp populates updatedAt before the
+        // response is serialized (same reason as createFolder).
+        return FolderResponse.from(folderRepository.saveAndFlush(folder));
+    }
+
+    /**
+     * Recursive delete. Returns the ids of every folder that was removed so the caller can purge
+     * them from its local cache. Files inside those folders are detached (folder_id set to null) -
+     * never deleted.
+     */
+    @Transactional
+    public List<UUID> deleteFolder(UUID id) {
+        ensureStorageEnabled();
+        User user = requireAuthenticatedUser();
+        Folder folder = requireOwnedFolder(id, user);
+
+        // Build the parent → children map once. Project to id-only via the
+        // existing entity list (Hibernate already has the column loaded -
+        // we only access f.getParent().getId() on a managed proxy, which
+        // does NOT initialize the proxy because Hibernate has the FK
+        // value cached at the join column).
+        Map<UUID, List<UUID>> childIdsByParent = new HashMap<>();
+        for (Folder f : folderRepository.findAllByOwnerOrderByName(user)) {
+            UUID parentId = f.getParent() == null ? null : f.getParent().getId();
+            childIdsByParent.computeIfAbsent(parentId, k -> new ArrayList<>()).add(f.getId());
+        }
+
+        // Iterative subtree collection - prior recursive form blew the JVM
+        // stack on deeply nested chains a malicious caller could create.
+        List<UUID> removed = new ArrayList<>();
+        Set<UUID> seen = new HashSet<>();
+        Deque<UUID> stack = new ArrayDeque<>();
+        stack.push(folder.getId());
+        while (!stack.isEmpty()) {
+            UUID cur = stack.pop();
+            if (!seen.add(cur)) continue;
+            removed.add(cur);
+            List<UUID> children = childIdsByParent.get(cur);
+            if (children != null) {
+                for (UUID childId : children) stack.push(childId);
+            }
+        }
+
+        if (!removed.isEmpty()) {
+            folderRepository.clearFolderForFiles(removed);
+            folderRepository.deleteAllByIdInBatch(removed);
+            log.info(
+                    "Folder subtree deleted: user={} root={} count={}",
+                    user.getId(),
+                    folder.getId(),
+                    removed.size());
+        }
+
+        return removed;
+    }
+
+    /**
+     * Move a single owned file to a folder (or root when {@code folderId} is null). Owns its
+     * own @Transactional rather than relying on the caller so the JDBC connection is released as
+     * soon as the writes commit, not held through controller-side JSON serialization.
+     */
+    @Transactional
+    public void moveFileToFolder(Long fileId, UUID folderId) {
+        ensureStorageEnabled();
+        User user = requireAuthenticatedUser();
+        StoredFile file =
+                storedFileRepository
+                        .findByIdAndOwner(fileId, user)
+                        .orElseThrow(
+                                () ->
+                                        new ResponseStatusException(
+                                                HttpStatus.NOT_FOUND,
+                                                "File not found or not owned by current user"));
+        file.setFolder(resolveOwnedFolder(folderId, user));
+        storedFileRepository.save(file);
+    }
+
+    /**
+     * Bulk move that returns the moved + skipped split. Skipped == file ids the caller doesn't own
+     * (or that no longer exist); the controller surfaces this as 207 Multi-Status.
+     */
+    @Transactional
+    public BulkMoveResult bulkMoveFilesToFolder(UUID folderId, List<Long> fileIds) {
+        ensureStorageEnabled();
+        if (fileIds == null || fileIds.isEmpty()) {
+            return new BulkMoveResult(List.of(), List.of());
+        }
+        if (fileIds.size() > BULK_MOVE_MAX_FILES) {
+            throw new ResponseStatusException(
+                    HttpStatus.BAD_REQUEST,
+                    "fileIds must contain between 1 and " + BULK_MOVE_MAX_FILES + " entries");
+        }
+        User user = requireAuthenticatedUser();
+        Folder target = resolveOwnedFolder(folderId, user);
+
+        List<StoredFile> owned = storedFileRepository.findAllByIdInAndOwner(fileIds, user);
+        Set<Long> ownedIds = new HashSet<>(owned.size());
+        for (StoredFile f : owned) {
+            f.setFolder(target);
+            ownedIds.add(f.getId());
+        }
+        // If the target folder was deleted concurrently between resolveOwnedFolder and the
+        // flush, the FK constraint fires as DataIntegrityViolationException. Surface that as
+        // 409 Conflict so the caller sees an actionable error instead of a 500 stack.
+        try {
+            storedFileRepository.saveAll(owned);
+            storedFileRepository.flush();
+        } catch (DataIntegrityViolationException ex) {
+            throw new ResponseStatusException(
+                    HttpStatus.CONFLICT,
+                    "Target folder no longer exists; refresh and try again",
+                    ex);
+        }
+
+        List<Long> moved = owned.stream().map(StoredFile::getId).toList();
+        List<Long> skipped = fileIds.stream().filter(id -> !ownedIds.contains(id)).toList();
+        if (!skipped.isEmpty()) {
+            log.warn(
+                    "bulkMove: user {} skipped {} of {} files (not owned or missing)",
+                    user.getId(),
+                    skipped.size(),
+                    fileIds.size());
+        }
+        return new BulkMoveResult(moved, skipped);
+    }
+
+    /** Result of {@link #bulkMoveFilesToFolder}. Records are immutable + auto-serializable. */
+    public record BulkMoveResult(List<Long> movedFileIds, List<Long> skippedFileIds) {}
+
+    // ─── helpers ────────────────────────────────────────────────────
+
+    /**
+     * Resolve a placement-target folder. Distinct from {@link #resolveParent} because move targets
+     * don't carry the parent-cycle semantics - we only need the folder to exist AND belong to the
+     * caller. Returns null for null input (root).
+     */
+    private Folder resolveOwnedFolder(UUID folderId, User user) {
+        if (folderId == null) return null;
+        return folderRepository
+                .findByIdAndOwner(folderId, user)
+                .orElseThrow(
+                        () ->
+                                new ResponseStatusException(
+                                        HttpStatus.BAD_REQUEST,
+                                        "Folder does not exist or is not owned by you"));
+    }
+
+    private Folder requireOwnedFolder(UUID id, User user) {
+        return folderRepository
+                .findByIdAndOwner(id, user)
+                .orElseThrow(
+                        () ->
+                                new ResponseStatusException(
+                                        HttpStatus.NOT_FOUND,
+                                        "Folder not found or not owned by current user"));
+    }
+
+    private Folder resolveParent(UUID parentId, User user, UUID forbidId) {
+        if (parentId == null) return null;
+        if (forbidId != null && parentId.equals(forbidId)) {
+            throw new ResponseStatusException(
+                    HttpStatus.BAD_REQUEST, "A folder cannot be its own parent");
+        }
+        Folder parent =
+                folderRepository
+                        .findByIdAndOwner(parentId, user)
+                        .orElseThrow(
+                                () ->
+                                        new ResponseStatusException(
+                                                HttpStatus.BAD_REQUEST,
+                                                "Parent folder does not exist or is not owned by you"));
+        // Reject before the child is created/moved if attaching it would push the chain past the
+        // depth cap. Done in one pass that also returns the cycle answer so we don't walk the
+        // lazy-proxy chain twice.
+        enforceDepthAndCycle(parent, user, forbidId);
+        return parent;
+    }
+
+    /**
+     * Single pass that walks the parent chain to root and (a) rejects if attaching a child here
+     * would exceed MAX_FOLDER_DEPTH, (b) rejects if {@code forbidId} appears in the chain (cycle on
+     * reparent), (c) rejects on a broken graph, and (d) rejects if any ancestor is owned by a
+     * different user (defense-in-depth: callers always pass a parent already ownership-checked, but
+     * the parent chain is followed via lazy proxy without re-checking ownership at each hop, so any
+     * stray cross-owner edge in the database would otherwise leak ancestor folder ids through the
+     * cycle error message). The walk is hard-bounded at MAX_FOLDER_DEPTH so a corrupted database
+     * (chain longer than the API would allow) can never produce an unbounded SELECT loop.
+     */
+    private void enforceDepthAndCycle(Folder candidateParent, User user, UUID forbidId) {
+        Folder cursor = candidateParent;
+        Set<UUID> seen = new HashSet<>();
+        int depth = 0;
+        while (cursor != null) {
+            if (cursor.getOwner() == null || !cursor.getOwner().getId().equals(user.getId())) {
+                throw new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST, "Folder hierarchy is corrupted; contact support");
+            }
+            if (forbidId != null && cursor.getId().equals(forbidId)) {
+                throw new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST,
+                        "Cannot move a folder inside one of its descendants");
+            }
+            if (!seen.add(cursor.getId())) {
+                // broken graph (cycle in stored data)
+                throw new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST, "Folder hierarchy is corrupted; contact support");
+            }
+            depth += 1;
+            // candidateParent is at depth 1 from the new child's perspective. After the walk,
+            // `depth` equals the number of ancestors including candidateParent, which is the
+            // depth at which the new child would live. Reject before exceeding the cap.
+            if (depth >= MAX_FOLDER_DEPTH) {
+                throw new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST,
+                        "Folder nesting limit reached (max " + MAX_FOLDER_DEPTH + " levels)");
+            }
+            cursor = cursor.getParent();
+        }
+    }
+
+    private User requireAuthenticatedUser() {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        if (authentication == null
+                || !authentication.isAuthenticated()
+                || !(authentication.getPrincipal() instanceof User user)) {
+            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Authentication required");
+        }
+        return user;
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/cluster/s3/S3ClientsTest.java

@@ -0,0 +1,147 @@
+package stirling.software.proprietary.cluster.s3;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.net.URI;
+
+import org.junit.jupiter.api.Test;
+
+import software.amazon.awssdk.core.checksums.RequestChecksumCalculation;
+import software.amazon.awssdk.core.checksums.ResponseChecksumValidation;
+
+class S3ClientsTest {
+
+    @Test
+    void validateEndpointHost_publicAwsHost_passes() {
+        assertThatCode(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("https://s3.us-east-1.amazonaws.com"), false))
+                .doesNotThrowAnyException();
+    }
+
+    @Test
+    void validateEndpointHost_metadataServiceIp_rejected() {
+        assertThatThrownBy(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("http://169.254.169.254/"), false))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("allow-private-endpoints");
+    }
+
+    @Test
+    void validateEndpointHost_loopback_rejected() {
+        assertThatThrownBy(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("http://127.0.0.1:9000/"), false))
+                .isInstanceOf(IllegalStateException.class);
+    }
+
+    @Test
+    void validateEndpointHost_rfc1918Private_rejected() {
+        assertThatThrownBy(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("http://10.0.0.5:9000/"), false))
+                .isInstanceOf(IllegalStateException.class);
+    }
+
+    @Test
+    void validateEndpointHost_allowPrivateOptIn_bypassesCheck() {
+        assertThatCode(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("http://169.254.169.254/"), true))
+                .doesNotThrowAnyException();
+        assertThatCode(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("http://127.0.0.1:9000/"), true))
+                .doesNotThrowAnyException();
+    }
+
+    @Test
+    void validateEndpointHost_missingHost_rejected() {
+        assertThatThrownBy(
+                        () ->
+                                S3Clients.validateEndpointHost(
+                                        URI.create("file:///etc/passwd"), false))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("must include a host");
+    }
+
+    @Test
+    void validateEndpointHost_errorMessageNamesTheFlag() {
+        assertThat(
+                        catchMessage(
+                                () ->
+                                        S3Clients.validateEndpointHost(
+                                                URI.create("http://192.168.1.10:9000/"), false)))
+                .contains("storage.s3.allow-private-endpoints");
+    }
+
+    // ----- requestChecksumCalculation parsing -----
+
+    @Test
+    void parseRequestChecksum_nullOrBlank_defaultsToWhenSupported() {
+        assertThat(S3Clients.parseRequestChecksum(null))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+        assertThat(S3Clients.parseRequestChecksum(""))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+        assertThat(S3Clients.parseRequestChecksum("   "))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+    }
+
+    @Test
+    void parseRequestChecksum_caseInsensitive_andTrimmed() {
+        assertThat(S3Clients.parseRequestChecksum("when_required"))
+                .isEqualTo(RequestChecksumCalculation.WHEN_REQUIRED);
+        assertThat(S3Clients.parseRequestChecksum("  WHEN_REQUIRED  "))
+                .isEqualTo(RequestChecksumCalculation.WHEN_REQUIRED);
+        assertThat(S3Clients.parseRequestChecksum("When_Supported"))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+    }
+
+    @Test
+    void parseRequestChecksum_unknownValue_fallsBackToDefault() {
+        assertThat(S3Clients.parseRequestChecksum("yes-please"))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+        assertThat(S3Clients.parseRequestChecksum("disabled-completely"))
+                .isEqualTo(RequestChecksumCalculation.WHEN_SUPPORTED);
+    }
+
+    // ----- responseChecksumValidation parsing -----
+
+    @Test
+    void parseResponseChecksum_nullOrBlank_defaultsToWhenSupported() {
+        assertThat(S3Clients.parseResponseChecksum(null))
+                .isEqualTo(ResponseChecksumValidation.WHEN_SUPPORTED);
+        assertThat(S3Clients.parseResponseChecksum(""))
+                .isEqualTo(ResponseChecksumValidation.WHEN_SUPPORTED);
+    }
+
+    @Test
+    void parseResponseChecksum_explicitWhenRequired_returnedAsEnum() {
+        assertThat(S3Clients.parseResponseChecksum("WHEN_REQUIRED"))
+                .isEqualTo(ResponseChecksumValidation.WHEN_REQUIRED);
+    }
+
+    @Test
+    void parseResponseChecksum_unknownValue_fallsBackToDefault() {
+        assertThat(S3Clients.parseResponseChecksum("nope"))
+                .isEqualTo(ResponseChecksumValidation.WHEN_SUPPORTED);
+    }
+
+    private static String catchMessage(Runnable r) {
+        try {
+            r.run();
+            return "";
+        } catch (RuntimeException e) {
+            return e.getMessage() == null ? "" : e.getMessage();
+        }
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/cluster/s3/S3FileStoreTest.java

@@ -0,0 +1,253 @@
+package stirling.software.proprietary.cluster.s3;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.testcontainers.containers.MinIOContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import stirling.software.common.cluster.FileStore;
+
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
+import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.services.s3.model.CreateBucketRequest;
+import software.amazon.awssdk.services.s3.model.HeadObjectRequest;
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException;
+
+@Testcontainers(disabledWithoutDocker = true)
+class S3FileStoreTest {
+
+    private static final String BUCKET = "stirling-test-filestore";
+    private static final String ACCESS_KEY = "minioadmin";
+    private static final String SECRET_KEY = "minioadmin";
+
+    @Container
+    static MinIOContainer minio =
+            new MinIOContainer("minio/minio:latest")
+                    .withUserName(ACCESS_KEY)
+                    .withPassword(SECRET_KEY);
+
+    private static S3Client s3Client;
+    private static S3FileStore store;
+
+    @BeforeAll
+    static void setUp() {
+        URI endpoint = URI.create(minio.getS3URL());
+        AwsBasicCredentials creds = AwsBasicCredentials.create(ACCESS_KEY, SECRET_KEY);
+        S3Configuration s3Config = S3Configuration.builder().pathStyleAccessEnabled(true).build();
+
+        s3Client =
+                S3Client.builder()
+                        .endpointOverride(endpoint)
+                        .httpClient(UrlConnectionHttpClient.create())
+                        .region(Region.US_EAST_1)
+                        .credentialsProvider(StaticCredentialsProvider.create(creds))
+                        .serviceConfiguration(s3Config)
+                        .build();
+
+        s3Client.createBucket(CreateBucketRequest.builder().bucket(BUCKET).build());
+        store = new S3FileStore(s3Client, BUCKET, "transient/", false);
+    }
+
+    @AfterAll
+    static void tearDown() {
+        if (store != null) {
+            store.close();
+        }
+        if (s3Client != null) {
+            s3Client.close();
+        }
+    }
+
+    @Test
+    void blankBucket_constructorRejects() {
+        assertThatThrownBy(() -> new S3FileStore(s3Client, ""))
+                .isInstanceOf(IllegalArgumentException.class);
+        assertThatThrownBy(() -> new S3FileStore(s3Client, null))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    void store_thenRetrieve_roundTripsContent() throws IOException {
+        byte[] payload = "hello cluster s3".getBytes(StandardCharsets.UTF_8);
+        FileStore.Stored stored = store.store(new ByteArrayInputStream(payload), "foo.txt");
+
+        assertThat(stored.fileId()).isNotBlank();
+        assertThat(stored.size()).isEqualTo(payload.length);
+
+        assertThat(store.exists(stored.fileId())).isTrue();
+        assertThat(store.size(stored.fileId())).isEqualTo(payload.length);
+        assertThat(store.retrieveBytes(stored.fileId())).isEqualTo(payload);
+
+        try (InputStream in = store.retrieve(stored.fileId())) {
+            assertThat(in.readAllBytes()).isEqualTo(payload);
+        }
+    }
+
+    @Test
+    void store_keysUseConfiguredPrefix() throws IOException {
+        byte[] payload = "prefixed".getBytes(StandardCharsets.UTF_8);
+        FileStore.Stored stored = store.store(new ByteArrayInputStream(payload), "p.txt");
+
+        String prefixed = store.resolveKey(stored.fileId());
+        assertThat(prefixed).startsWith("transient/");
+        s3Client.headObject(HeadObjectRequest.builder().bucket(BUCKET).key(prefixed).build());
+
+        assertThatThrownBy(
+                        () ->
+                                s3Client.headObject(
+                                        HeadObjectRequest.builder()
+                                                .bucket(BUCKET)
+                                                .key(stored.fileId())
+                                                .build()))
+                .isInstanceOfAny(
+                        NoSuchKeyException.class,
+                        software.amazon.awssdk.services.s3.model.S3Exception.class);
+    }
+
+    @Test
+    void emptyPrefix_writesAtBucketRoot() throws IOException {
+        S3FileStore rootStore = new S3FileStore(s3Client, BUCKET, "", false);
+        byte[] payload = "no-prefix".getBytes(StandardCharsets.UTF_8);
+        FileStore.Stored stored = rootStore.store(new ByteArrayInputStream(payload), "r.txt");
+        assertThat(rootStore.resolveKey(stored.fileId())).isEqualTo(stored.fileId());
+        assertThat(rootStore.retrieveBytes(stored.fileId())).isEqualTo(payload);
+        assertThat(rootStore.delete(stored.fileId())).isTrue();
+    }
+
+    @Test
+    void delete_removesObject_andReturnsTrue() throws IOException {
+        FileStore.Stored stored =
+                store.store(new ByteArrayInputStream(new byte[] {1, 2, 3}), "d.bin");
+        assertThat(store.delete(stored.fileId())).isTrue();
+        assertThat(store.exists(stored.fileId())).isFalse();
+        assertThatThrownBy(() -> store.retrieveBytes(stored.fileId()))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void delete_unknownKey_isIdempotentReturnsTrue() {
+        // S3 DeleteObject is idempotent (returns 204 whether or not the object existed).
+        // The store reflects S3's behaviour rather than racing a HEAD before each DELETE.
+        assertThat(store.delete("00000000-0000-0000-0000-000000000000")).isTrue();
+    }
+
+    @Test
+    void retrieve_missingKey_throwsIOException() {
+        assertThatThrownBy(() -> store.retrieveBytes("does-not-exist"))
+                .isInstanceOf(IOException.class);
+        assertThatThrownBy(() -> store.retrieve("does-not-exist")).isInstanceOf(IOException.class);
+        assertThatThrownBy(() -> store.size("does-not-exist")).isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void exists_returnsFalseForBlankOrTraversalIds() {
+        assertThat(store.exists(null)).isFalse();
+        assertThat(store.exists("")).isFalse();
+        assertThat(store.exists("..")).isFalse();
+        assertThat(store.exists("a/b")).isFalse();
+        assertThat(store.exists("a\\b")).isFalse();
+    }
+
+    @Test
+    void delete_traversalId_returnsFalseWithoutCall() {
+        assertThat(store.delete("../etc/passwd")).isFalse();
+        assertThat(store.delete("foo/bar")).isFalse();
+    }
+
+    @Test
+    void store_largePayload_streamsViaTempFileWithoutBufferingInMemory() throws IOException {
+        long payloadSize = 16L * 1024 * 1024;
+        Path tempDir = Path.of(System.getProperty("java.io.tmpdir"));
+        long uploadTempsBefore = countS3UploadTemps(tempDir);
+
+        FileStore.Stored stored;
+        try (InputStream large = new RepeatingInputStream((byte) 0x42, payloadSize)) {
+            stored = store.store(large, "big.bin");
+        }
+
+        assertThat(stored.size()).isEqualTo(payloadSize);
+        assertThat(store.size(stored.fileId())).isEqualTo(payloadSize);
+        assertThat(countS3UploadTemps(tempDir)).isEqualTo(uploadTempsBefore);
+        store.delete(stored.fileId());
+    }
+
+    @Test
+    void store_uploadFailure_stillDeletesTempFile() {
+        Path tempDir = Path.of(System.getProperty("java.io.tmpdir"));
+        long uploadTempsBefore = countS3UploadTemps(tempDir);
+
+        // Non-existent bucket causes putObject to fail after the temp file is written, exercising
+        // the failure-path cleanup in the finally block.
+        S3FileStore brokenStore =
+                new S3FileStore(s3Client, "bucket-that-does-not-exist", "transient/", false);
+
+        assertThatThrownBy(
+                        () ->
+                                brokenStore.store(
+                                        new ByteArrayInputStream(
+                                                "payload".getBytes(StandardCharsets.UTF_8)),
+                                        "x.bin"))
+                .isInstanceOf(IOException.class);
+
+        assertThat(countS3UploadTemps(tempDir)).isEqualTo(uploadTempsBefore);
+    }
+
+    private static long countS3UploadTemps(Path tempDir) {
+        try (Stream<Path> entries = Files.list(tempDir)) {
+            return entries.filter(p -> p.getFileName().toString().startsWith("s3-upload-")).count();
+        } catch (IOException e) {
+            return 0L;
+        }
+    }
+
+    /** Generates {@code length} bytes of a single value without buffering them in memory. */
+    private static final class RepeatingInputStream extends InputStream {
+        private final byte value;
+        private long remaining;
+
+        RepeatingInputStream(byte value, long length) {
+            this.value = value;
+            this.remaining = length;
+        }
+
+        @Override
+        public int read() {
+            if (remaining <= 0) {
+                return -1;
+            }
+            remaining--;
+            return value & 0xFF;
+        }
+
+        @Override
+        public int read(byte[] b, int off, int len) {
+            if (remaining <= 0) {
+                return -1;
+            }
+            int toWrite = (int) Math.min(len, remaining);
+            for (int i = 0; i < toWrite; i++) {
+                b[off + i] = value;
+            }
+            remaining -= toWrite;
+            return toWrite;
+        }
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/cluster/s3/S3VendorComprehensiveTest.java

@@ -0,0 +1,779 @@
+package stirling.software.proprietary.cluster.s3;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
+import org.springframework.mock.web.MockMultipartFile;
+
+import stirling.software.common.cluster.FileStore;
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.model.User;
+import stirling.software.proprietary.storage.provider.S3StorageProvider;
+import stirling.software.proprietary.storage.provider.StoredObject;
+
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.s3.model.NoSuchBucketException;
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException;
+import software.amazon.awssdk.services.s3.model.S3Exception;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
+import software.amazon.awssdk.services.s3.presigner.model.PresignedGetObjectRequest;
+
+/**
+ * Comprehensive live-vendor test against a real S3-compatible endpoint specified via {@code
+ * S3_SMOKE_*} env vars. Skipped automatically when {@code S3_SMOKE_ENDPOINT} is not set, so CI is
+ * not affected. Covers:
+ *
+ * <ul>
+ *   <li>{@code S3StorageProvider} CRUD: store / load / delete / presigned URL
+ *   <li>{@code S3FileStore} CRUD (cluster artifact path)
+ *   <li>Folder semantics simulated via key prefixes (matches production usage)
+ *   <li>Negative paths: wrong secret, missing bucket, missing key, traversal IDs
+ *   <li>Edge cases: zero-byte, unicode filename, multi-megabyte streaming
+ *   <li>Configuration guards: SSRF endpoint rejection, bucket validation
+ * </ul>
+ *
+ * Every uploaded key is tracked and removed in {@link #cleanUp} so re-running against the same
+ * bucket leaves no residue.
+ */
+@EnabledIfEnvironmentVariable(named = "S3_SMOKE_ENDPOINT", matches = ".+")
+class S3VendorComprehensiveTest {
+
+    private static final String PREFIX = "stirling-comprehensive/" + UUID.randomUUID() + "/";
+
+    private static ApplicationProperties.Storage.S3 cfg;
+    private static S3Clients.Bundle bundle;
+    private static S3StorageProvider provider;
+    private static String bucket;
+    private static String vendorLabel;
+    private static User owner;
+
+    private static final List<String> keysToCleanup =
+            Collections.synchronizedList(new ArrayList<>());
+
+    @BeforeAll
+    static void setUp() {
+        cfg = configFromEnv();
+        bucket = cfg.getBucket();
+        vendorLabel = System.getenv().getOrDefault("S3_SMOKE_LABEL", "external");
+        bundle = S3Clients.build(cfg, "comprehensive[" + vendorLabel + "]");
+        provider = new S3StorageProvider(bundle.client(), bundle.presigner(), bucket);
+
+        owner = new User();
+        owner.setId(7L);
+        owner.setUsername("comprehensive-tester");
+    }
+
+    @AfterAll
+    static void cleanUp() {
+        if (bundle != null) {
+            for (String key : keysToCleanup) {
+                try {
+                    bundle.client().deleteObject(d -> d.bucket(bucket).key(key));
+                } catch (Exception e) {
+                    // Best-effort cleanup; ignore.
+                }
+            }
+            try {
+                provider.close();
+            } catch (Exception ignored) {
+            }
+            bundle.close();
+        }
+    }
+
+    private static String track(String key) {
+        keysToCleanup.add(key);
+        return key;
+    }
+
+    private static ApplicationProperties.Storage.S3 configFromEnv() {
+        ApplicationProperties.Storage.S3 c = new ApplicationProperties.Storage.S3();
+        c.setEndpoint(System.getenv("S3_SMOKE_ENDPOINT"));
+        c.setBucket(requireEnv("S3_SMOKE_BUCKET"));
+        c.setRegion(System.getenv().getOrDefault("S3_SMOKE_REGION", "us-east-1"));
+        c.setAccessKey(requireEnv("S3_SMOKE_KEY"));
+        c.setSecretKey(requireEnv("S3_SMOKE_SECRET"));
+        c.setPathStyleAccess(
+                Boolean.parseBoolean(System.getenv().getOrDefault("S3_SMOKE_PATHSTYLE", "false")));
+        c.setAllowPrivateEndpoints(false);
+        return c;
+    }
+
+    private static String requireEnv(String name) {
+        String value = System.getenv(name);
+        if (value == null || value.isBlank()) {
+            throw new IllegalStateException(name + " env var must be set");
+        }
+        return value;
+    }
+
+    // ==========================================================================================
+    // FILE CRUD via S3StorageProvider (user-uploaded files)
+    // ==========================================================================================
+
+    @Test
+    void provider_store_thenLoad_matchesBytes() throws IOException {
+        byte[] payload = ("provider-roundtrip-" + vendorLabel).getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file = new MockMultipartFile("file", "doc.txt", "text/plain", payload);
+
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        assertThat(obj.getStorageKey()).isNotBlank();
+        assertThat(obj.getSizeBytes()).isEqualTo(payload.length);
+        assertThat(provider.load(obj.getStorageKey()).getInputStream().readAllBytes())
+                .isEqualTo(payload);
+    }
+
+    @Test
+    void provider_delete_removesObject() throws IOException {
+        byte[] payload = "delete-me".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file = new MockMultipartFile("file", "x.txt", "text/plain", payload);
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        provider.delete(obj.getStorageKey());
+
+        assertThatThrownBy(() -> provider.load(obj.getStorageKey()))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void provider_load_missingKey_throws() {
+        assertThatThrownBy(() -> provider.load(PREFIX + "does-not-exist"))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void provider_presignedDownload_returnsBytesOverHttp() throws Exception {
+        byte[] payload = "presign me".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file = new MockMultipartFile("file", "p.txt", "text/plain", payload);
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        java.util.Optional<java.net.URI> url =
+                provider.signedDownloadUrl(obj.getStorageKey(), Duration.ofMinutes(5));
+        assertThat(url).isPresent();
+
+        HttpResponse<byte[]> resp =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(url.get()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+
+        assertThat(resp.statusCode()).isEqualTo(200);
+        assertThat(resp.body()).isEqualTo(payload);
+    }
+
+    @Test
+    void provider_store_zeroBytes_isAccepted() throws IOException {
+        MockMultipartFile empty =
+                new MockMultipartFile("file", "empty.txt", "text/plain", new byte[0]);
+        StoredObject obj = provider.store(owner, empty);
+        track(obj.getStorageKey());
+
+        assertThat(obj.getSizeBytes()).isZero();
+        assertThat(provider.load(obj.getStorageKey()).getInputStream().readAllBytes())
+                .isEqualTo(new byte[0]);
+    }
+
+    @Test
+    void provider_store_unicodeFilename_yieldsOpaqueAsciiKey_andPreservesNameForDisplay()
+            throws IOException {
+        // Regression: pre-fix, the storage key embedded the filename verbatim, which Supabase
+        // rejected with 400 Invalid key. Post-fix, the key is {ownerId}/{uuid} (ASCII-only)
+        // and the original unicode name lives on StoredObject.originalFilename.
+        String unicodeName = "résumé-日本語-é.pdf";
+        byte[] payload = "u".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file =
+                new MockMultipartFile("file", unicodeName, "application/pdf", payload);
+
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        assertThat(obj.getStorageKey()).matches("[0-9]+/[0-9a-fA-F-]+");
+        assertThat(obj.getStorageKey())
+                .isEqualTo(
+                        new String(
+                                obj.getStorageKey().getBytes(StandardCharsets.US_ASCII),
+                                StandardCharsets.US_ASCII));
+        assertThat(obj.getOriginalFilename()).isEqualTo(unicodeName);
+        assertThat(provider.load(obj.getStorageKey()).getInputStream().readAllBytes())
+                .isEqualTo(payload);
+    }
+
+    // ==========================================================================================
+    // Concurrency, overwrite, TTL expiry (added after initial run surfaced the unicode bug)
+    // ==========================================================================================
+
+    @Test
+    void provider_concurrent10Uploads_allSucceedWithDistinctKeys() throws Exception {
+        int n = 10;
+        java.util.concurrent.ExecutorService pool =
+                java.util.concurrent.Executors.newFixedThreadPool(n);
+        try {
+            List<java.util.concurrent.Future<StoredObject>> futures = new ArrayList<>();
+            for (int i = 0; i < n; i++) {
+                final int idx = i;
+                futures.add(
+                        pool.submit(
+                                () -> {
+                                    byte[] payload =
+                                            ("concurrent-" + idx).getBytes(StandardCharsets.UTF_8);
+                                    MockMultipartFile f =
+                                            new MockMultipartFile(
+                                                    "file",
+                                                    "c-" + idx + ".txt",
+                                                    "text/plain",
+                                                    payload);
+                                    StoredObject obj = provider.store(owner, f);
+                                    track(obj.getStorageKey());
+                                    return obj;
+                                }));
+            }
+
+            java.util.Set<String> keys = new java.util.HashSet<>();
+            for (java.util.concurrent.Future<StoredObject> fut : futures) {
+                StoredObject obj = fut.get(30, java.util.concurrent.TimeUnit.SECONDS);
+                assertThat(keys.add(obj.getStorageKey()))
+                        .as("distinct key for each parallel upload")
+                        .isTrue();
+                assertThat(provider.load(obj.getStorageKey()).getInputStream().readAllBytes())
+                        .isNotEmpty();
+            }
+        } finally {
+            pool.shutdownNow();
+        }
+    }
+
+    @Test
+    void sameKey_overwrite_returnsLatestPayload() {
+        String key = PREFIX + "overwrite-" + UUID.randomUUID() + ".txt";
+        track(key);
+
+        byte[] first = "FIRST".getBytes(StandardCharsets.UTF_8);
+        byte[] second = "SECOND".getBytes(StandardCharsets.UTF_8);
+
+        bundle.client().putObject(p -> p.bucket(bucket).key(key), RequestBody.fromBytes(first));
+        bundle.client().putObject(p -> p.bucket(bucket).key(key), RequestBody.fromBytes(second));
+
+        assertThat(getRaw(key)).isEqualTo(second);
+    }
+
+    @Test
+    void presignedDownload_afterTtlExpiry_returns403() throws Exception {
+        String key = PREFIX + "presign-expiry-" + UUID.randomUUID() + ".txt";
+        byte[] payload = "presign expiry".getBytes(StandardCharsets.UTF_8);
+        track(putRaw(key, "presign expiry"));
+
+        // 2-second TTL, then wait long enough that any vendor clock skew tolerance is also past.
+        PresignedGetObjectRequest presigned =
+                bundle.presigner()
+                        .presignGetObject(
+                                GetObjectPresignRequest.builder()
+                                        .signatureDuration(Duration.ofSeconds(2))
+                                        .getObjectRequest(g -> g.bucket(bucket).key(key))
+                                        .build());
+
+        // Confirm it works while valid - rules out unrelated failures.
+        HttpResponse<byte[]> ok =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(presigned.url().toURI()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+        assertThat(ok.statusCode()).isEqualTo(200);
+        assertThat(ok.body()).isEqualTo(payload);
+
+        Thread.sleep(5_000);
+
+        HttpResponse<byte[]> expired =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(presigned.url().toURI()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+        assertThat(expired.statusCode())
+                .as("presigned URL must be rejected after TTL expires")
+                .isIn(400, 403);
+    }
+
+    @Test
+    void provider_store_4MBPayload_streams() throws IOException {
+        byte[] payload = new byte[4 * 1024 * 1024];
+        java.util.Arrays.fill(payload, (byte) 0x42);
+        MockMultipartFile file =
+                new MockMultipartFile("file", "big.bin", "application/octet-stream", payload);
+
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        assertThat(obj.getSizeBytes()).isEqualTo(payload.length);
+        assertThat(provider.load(obj.getStorageKey()).getInputStream().readAllBytes())
+                .isEqualTo(payload);
+    }
+
+    // ==========================================================================================
+    // FILE CRUD via S3FileStore (cluster artifact path)
+    // ==========================================================================================
+
+    @Test
+    void fileStore_storeAndRetrieve_roundTrip() throws IOException {
+        S3FileStore store = new S3FileStore(bundle.client(), bucket, PREFIX + "fs/", false);
+        byte[] payload = "filestore round trip".getBytes(StandardCharsets.UTF_8);
+
+        FileStore.Stored stored = store.store(new ByteArrayInputStream(payload), "rt.txt");
+        track(store.resolveKey(stored.fileId()));
+
+        assertThat(store.size(stored.fileId())).isEqualTo(payload.length);
+        assertThat(store.retrieveBytes(stored.fileId())).isEqualTo(payload);
+        assertThat(store.exists(stored.fileId())).isTrue();
+    }
+
+    @Test
+    void fileStore_delete_returnsTrue_andExistsFalseAfter() throws IOException {
+        S3FileStore store = new S3FileStore(bundle.client(), bucket, PREFIX + "fs/", false);
+        FileStore.Stored stored = store.store(new ByteArrayInputStream("x".getBytes()), "del.txt");
+
+        assertThat(store.delete(stored.fileId())).isTrue();
+        assertThat(store.exists(stored.fileId())).isFalse();
+    }
+
+    @Test
+    void fileStore_retrieveBytes_missingKey_throws() {
+        S3FileStore store = new S3FileStore(bundle.client(), bucket, PREFIX + "fs/", false);
+        assertThatThrownBy(() -> store.retrieveBytes("does-not-exist"))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void fileStore_rejectsTraversalId() {
+        S3FileStore store = new S3FileStore(bundle.client(), bucket, PREFIX + "fs/", false);
+        assertThat(store.exists("..")).isFalse();
+        assertThat(store.delete("../etc/passwd")).isFalse();
+        assertThat(store.exists("a/b")).isFalse();
+        assertThat(store.exists("a\\b")).isFalse();
+    }
+
+    // ==========================================================================================
+    // Folder semantics simulated via key prefixes
+    // ==========================================================================================
+
+    @Test
+    void folderPrefix_isolatesObjects_andDeleteByPrefixDoesNotTouchRoot() throws IOException {
+        // Two "folders" + a root object - all reuse the test PREFIX so cleanup catches them.
+        String folderA = PREFIX + "folder-A/";
+        String folderB = PREFIX + "folder-B/";
+        String rootObj = PREFIX + "root-" + UUID.randomUUID() + ".txt";
+
+        track(putRaw(folderA + "file-1.txt", "in-A"));
+        track(putRaw(folderA + "file-2.txt", "in-A2"));
+        track(putRaw(folderB + "file-1.txt", "in-B"));
+        track(putRaw(rootObj, "at-root"));
+
+        // "Delete folder A": delete every key under folderA prefix
+        deleteAllUnderPrefix(folderA);
+
+        // Verify A is empty, B and root untouched
+        assertThat(headOrNull(folderA + "file-1.txt")).isNull();
+        assertThat(headOrNull(folderB + "file-1.txt")).isNotNull();
+        assertThat(headOrNull(rootObj)).isNotNull();
+    }
+
+    @Test
+    void moveBetweenFolders_viaCopyAndDelete_preservesContent() throws Exception {
+        String oldKey = PREFIX + "move-old/" + UUID.randomUUID() + ".txt";
+        String newKey = PREFIX + "move-new/" + UUID.randomUUID() + ".txt";
+        byte[] payload = "moveable".getBytes(StandardCharsets.UTF_8);
+
+        track(oldKey);
+        track(newKey);
+        bundle.client()
+                .putObject(p -> p.bucket(bucket).key(oldKey), RequestBody.fromBytes(payload));
+
+        // Simulate move: server-side copy + delete original.
+        bundle.client()
+                .copyObject(
+                        c ->
+                                c.sourceBucket(bucket)
+                                        .sourceKey(oldKey)
+                                        .destinationBucket(bucket)
+                                        .destinationKey(newKey));
+        bundle.client().deleteObject(d -> d.bucket(bucket).key(oldKey));
+
+        assertThat(headOrNull(oldKey)).isNull();
+        assertThat(getRaw(newKey)).isEqualTo(payload);
+    }
+
+    // ==========================================================================================
+    // Negative: wrong settings / wrong creds
+    // ==========================================================================================
+
+    @Test
+    void wrongSecret_throwsOnFirstOperation() {
+        ApplicationProperties.Storage.S3 bad = configFromEnv();
+        bad.setSecretKey("definitely-not-the-real-secret-" + UUID.randomUUID());
+
+        try (S3Clients.Bundle badBundle = S3Clients.build(bad, "wrong-secret")) {
+            assertThatThrownBy(() -> badBundle.client().headBucket(h -> h.bucket(bucket)))
+                    .isInstanceOf(S3Exception.class)
+                    .satisfies(e -> assertThat(((S3Exception) e).statusCode()).isIn(401, 403, 400));
+        }
+    }
+
+    @Test
+    void nonExistentBucket_throwsOnHeadOrPut() {
+        String fakeBucket = "stirling-no-such-bucket-" + UUID.randomUUID();
+        assertThatThrownBy(() -> bundle.client().headBucket(h -> h.bucket(fakeBucket)))
+                .isInstanceOfAny(NoSuchBucketException.class, S3Exception.class);
+    }
+
+    @Test
+    void blankBucket_atBuildTime_throwsIllegalState() {
+        ApplicationProperties.Storage.S3 bad = configFromEnv();
+        bad.setBucket("");
+        assertThatThrownBy(() -> S3Clients.build(bad, "blank-bucket"))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("bucket");
+    }
+
+    @Test
+    void invalidEndpointUri_atBuildTime_throwsIllegalState() {
+        ApplicationProperties.Storage.S3 bad = configFromEnv();
+        bad.setEndpoint("not a valid uri ::::");
+        assertThatThrownBy(() -> S3Clients.build(bad, "bad-uri"))
+                .isInstanceOf(IllegalStateException.class);
+    }
+
+    @Test
+    void privateEndpoint_withoutOptIn_atBuildTime_throwsIllegalState() {
+        ApplicationProperties.Storage.S3 bad = configFromEnv();
+        bad.setEndpoint("http://127.0.0.1:9000");
+        bad.setAllowPrivateEndpoints(false);
+        assertThatThrownBy(() -> S3Clients.build(bad, "loopback"))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("private");
+    }
+
+    @Test
+    void getMissingKey_returnsNoSuchKey() {
+        String missing = PREFIX + "missing-" + UUID.randomUUID();
+        assertThatThrownBy(() -> bundle.client().getObject(g -> g.bucket(bucket).key(missing)))
+                .isInstanceOfAny(NoSuchKeyException.class, S3Exception.class);
+    }
+
+    // ==========================================================================================
+    // Bundle lifecycle
+    // ==========================================================================================
+
+    @Test
+    void bundleClose_isIdempotent() {
+        ApplicationProperties.Storage.S3 c = configFromEnv();
+        S3Clients.Bundle b = S3Clients.build(c, "lifecycle");
+        b.close();
+        b.close(); // should not throw
+    }
+
+    // ==========================================================================================
+    // Internal helpers (using the bundle directly for prefix/folder simulation)
+    // ==========================================================================================
+
+    private String putRaw(String key, String body) {
+        bundle.client()
+                .putObject(
+                        p -> p.bucket(bucket).key(key),
+                        RequestBody.fromBytes(body.getBytes(StandardCharsets.UTF_8)));
+        return key;
+    }
+
+    private byte[] getRaw(String key) {
+        return bundle.client().getObjectAsBytes(g -> g.bucket(bucket).key(key)).asByteArray();
+    }
+
+    private Object headOrNull(String key) {
+        try {
+            return bundle.client().headObject(h -> h.bucket(bucket).key(key));
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    private byte[] tryGetBytes(String key) {
+        try {
+            return bundle.client().getObjectAsBytes(g -> g.bucket(bucket).key(key)).asByteArray();
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    private void deleteAllUnderPrefix(String prefix) {
+        var listing = bundle.client().listObjectsV2(l -> l.bucket(bucket).prefix(prefix));
+        for (var obj : listing.contents()) {
+            bundle.client().deleteObject(d -> d.bucket(bucket).key(obj.key()));
+        }
+    }
+
+    // ==========================================================================================
+    // Key edge cases: leading/trailing/double slash, length, URL-special chars
+    // ==========================================================================================
+
+    @Test
+    void key_trailingSlash_storesAsZeroByteFolderMarker() {
+        String key = PREFIX + "folder-marker-" + UUID.randomUUID() + "/";
+        track(key);
+
+        // S3 spec: trailing slash is legal and creates a 0-byte "folder marker" object.
+        // Some vendors normalize it away; capture either behavior.
+        bundle.client()
+                .putObject(p -> p.bucket(bucket).key(key), RequestBody.fromBytes(new byte[0]));
+        Object head = headOrNull(key);
+        // Either: vendor accepts the marker (head is non-null) or normalizes to bare key.
+        assertThat(head != null || headOrNull(key.substring(0, key.length() - 1)) != null)
+                .as("vendor should either accept trailing-slash marker or normalize to bare key")
+                .isTrue();
+    }
+
+    @Test
+    void key_doubleSlash_normalizedOrStoredVerbatim() {
+        String key = PREFIX + "double//slash-" + UUID.randomUUID() + ".txt";
+        track(key);
+        bundle.client()
+                .putObject(
+                        p -> p.bucket(bucket).key(key),
+                        RequestBody.fromBytes("ds".getBytes(StandardCharsets.UTF_8)));
+
+        // Either GET-with-the-exact-key works, or vendor normalized -> single-slash form works.
+        String alt = key.replace("//", "/");
+        track(alt);
+        byte[] viaExact = tryGetBytes(key);
+        byte[] viaNormalized = tryGetBytes(alt);
+        assertThat(viaExact != null || viaNormalized != null)
+                .as("either exact double-slash key or normalized single-slash form must return")
+                .isTrue();
+    }
+
+    @Test
+    void key_200Chars_isStoredAndRetrievable() {
+        // Stirling production keys are ~45 chars ({ownerId}/{uuid}). 200 chars exceeds that by
+        // ~5x but stays inside every vendor's documented limit. The S3 spec max is 1024 bytes
+        // but some vendors (Supabase) impose stricter caps (~250-byte total path including
+        // bucket prefix - 1000 chars fails with KeyTooLongError).
+        StringBuilder sb = new StringBuilder(PREFIX + "long/");
+        while (sb.length() < 200) {
+            sb.append("abcdefghij");
+        }
+        String longKey = sb.substring(0, 200);
+        track(longKey);
+
+        byte[] payload = "long-key".getBytes(StandardCharsets.UTF_8);
+        bundle.client()
+                .putObject(p -> p.bucket(bucket).key(longKey), RequestBody.fromBytes(payload));
+        assertThat(getRaw(longKey)).isEqualTo(payload);
+    }
+
+    @Test
+    void key_safeSpecialChars_areSignedAndRetrievableViaSdk() {
+        // Restrict to chars every S3-compatible vendor accepts: dot, dash, underscore.
+        // Stirling's production key format ({ownerId}/{uuid}) is even narrower; this test
+        // confirms the SDK SigV4 signer copes with slightly more exotic ASCII-safe keys.
+        // Note: Supabase rejects keys containing space / + / ? / & / # ("400 Invalid key"),
+        // see documentsVendorKeyRestrictions_tolerantTest for that documentation.
+        String key =
+                PREFIX
+                        + "safe-special/"
+                        + UUID.randomUUID()
+                        + "_segment.with-dots.and_underscores.txt";
+        track(key);
+
+        bundle.client()
+                .putObject(
+                        p -> p.bucket(bucket).key(key),
+                        RequestBody.fromBytes("safe".getBytes(StandardCharsets.UTF_8)));
+        assertThat(getRaw(key)).isEqualTo("safe".getBytes(StandardCharsets.UTF_8));
+    }
+
+    @Test
+    void documentsVendorKeyRestrictions_tolerantTest() {
+        // Documents - rather than enforces - which key characters cause vendor rejection.
+        // Stirling production code is safe because S3StorageProvider always emits an
+        // ASCII-safe UUID-only key. If you ever change that, this test becomes a canary.
+        // AWS S3 and MinIO accept all of these; Supabase rejects all of them with 400.
+        String[] suspiciousKeys = {
+            PREFIX + "with space.txt",
+            PREFIX + "with+plus.txt",
+            PREFIX + "with#hash.txt",
+            PREFIX + "with?question.txt",
+            PREFIX + "with&amp.txt",
+        };
+        int accepted = 0;
+        int rejected = 0;
+        for (String k : suspiciousKeys) {
+            track(k);
+            try {
+                bundle.client()
+                        .putObject(
+                                p -> p.bucket(bucket).key(k),
+                                RequestBody.fromBytes("x".getBytes(StandardCharsets.UTF_8)));
+                accepted++;
+            } catch (S3Exception e) {
+                assertThat(e.statusCode())
+                        .as("vendor rejection must be a clean 4xx, not a signature mismatch")
+                        .isBetween(400, 499);
+                rejected++;
+            }
+        }
+        assertThat(accepted + rejected).isEqualTo(suspiciousKeys.length);
+    }
+
+    // ==========================================================================================
+    // Presigned-URL: TTL bounds + Content-Disposition behavior (Stirling uses this for shares)
+    // ==========================================================================================
+
+    @Test
+    void presignedGet_ttlExceeding7Days_isRejectedAtSigningTime() {
+        String key = PREFIX + "ttl-overflow-" + UUID.randomUUID() + ".txt";
+        track(putRaw(key, "x"));
+
+        // SigV4 caps presigned URL TTL at 7 days. SDK should refuse to sign anything larger.
+        assertThatThrownBy(
+                        () ->
+                                bundle.presigner()
+                                        .presignGetObject(
+                                                GetObjectPresignRequest.builder()
+                                                        .signatureDuration(Duration.ofDays(8))
+                                                        .getObjectRequest(
+                                                                g -> g.bucket(bucket).key(key))
+                                                        .build()))
+                .isInstanceOfAny(IllegalArgumentException.class, RuntimeException.class);
+    }
+
+    @Test
+    void provider_signedDownloadUrl_attachmentDisposition_endsWithAttachmentHeader()
+            throws Exception {
+        byte[] payload = "attach me".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file =
+                new MockMultipartFile("file", "report.pdf", "application/pdf", payload);
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        java.util.Optional<java.net.URI> url =
+                provider.signedDownloadUrl(
+                        obj.getStorageKey(), Duration.ofMinutes(2), false, "report.pdf");
+        assertThat(url).isPresent();
+
+        HttpResponse<byte[]> resp =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(url.get()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+
+        assertThat(resp.statusCode()).isEqualTo(200);
+        // Supabase + AWS both honor response-content-disposition query param.
+        assertThat(resp.headers().firstValue("content-disposition").orElse(""))
+                .as("vendor must honor response-content-disposition override in presigned URL")
+                .startsWith("attachment");
+    }
+
+    @Test
+    void provider_signedDownloadUrl_inlineDisposition_endsWithInlineHeader() throws Exception {
+        byte[] payload = "inline".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file =
+                new MockMultipartFile("file", "preview.pdf", "application/pdf", payload);
+        StoredObject obj = provider.store(owner, file);
+        track(obj.getStorageKey());
+
+        java.util.Optional<java.net.URI> url =
+                provider.signedDownloadUrl(
+                        obj.getStorageKey(), Duration.ofMinutes(2), true, "preview.pdf");
+        assertThat(url).isPresent();
+
+        HttpResponse<byte[]> resp =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(url.get()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+
+        assertThat(resp.statusCode()).isEqualTo(200);
+        assertThat(resp.headers().firstValue("content-disposition").orElse(""))
+                .as("inline=true must set 'inline' disposition")
+                .startsWith("inline");
+    }
+
+    // ==========================================================================================
+    // List pagination + HEAD missing semantics
+    // ==========================================================================================
+
+    @Test
+    void listObjectsV2_paginationWithMaxKeys_returnsContinuationToken() {
+        // Stage 3 objects under a unique sub-prefix.
+        String prefix = PREFIX + "page-" + UUID.randomUUID() + "/";
+        for (int i = 0; i < 3; i++) {
+            track(putRaw(prefix + "obj-" + i, "p" + i));
+        }
+
+        var first = bundle.client().listObjectsV2(l -> l.bucket(bucket).prefix(prefix).maxKeys(1));
+        assertThat(first.contents()).hasSize(1);
+        assertThat(first.isTruncated()).isTrue();
+        assertThat(first.nextContinuationToken()).isNotBlank();
+
+        var second =
+                bundle.client()
+                        .listObjectsV2(
+                                l ->
+                                        l.bucket(bucket)
+                                                .prefix(prefix)
+                                                .maxKeys(2)
+                                                .continuationToken(first.nextContinuationToken()));
+        assertThat(second.contents()).hasSize(2);
+        assertThat(second.isTruncated()).isFalse();
+    }
+
+    @Test
+    void headObject_missingKey_throwsNoSuchKeyOr404() {
+        String missing = PREFIX + "head-missing-" + UUID.randomUUID();
+        assertThatThrownBy(() -> bundle.client().headObject(h -> h.bucket(bucket).key(missing)))
+                .isInstanceOf(S3Exception.class)
+                .satisfies(e -> assertThat(((S3Exception) e).statusCode()).isEqualTo(404));
+    }
+
+    /**
+     * Presigned-URL test scaffolding for parity with the smoke test (covers the SDK presign path).
+     */
+    @Test
+    void presignGetObject_independentOfProvider_returnsBytes() throws Exception {
+        String key = PREFIX + "presign-direct-" + UUID.randomUUID() + ".txt";
+        byte[] payload = "direct presign".getBytes(StandardCharsets.UTF_8);
+        track(putRaw(key, "direct presign"));
+
+        PresignedGetObjectRequest presigned =
+                bundle.presigner()
+                        .presignGetObject(
+                                GetObjectPresignRequest.builder()
+                                        .signatureDuration(Duration.ofMinutes(2))
+                                        .getObjectRequest(g -> g.bucket(bucket).key(key))
+                                        .build());
+
+        HttpResponse<byte[]> resp =
+                HttpClient.newHttpClient()
+                        .send(
+                                HttpRequest.newBuilder(presigned.url().toURI()).GET().build(),
+                                HttpResponse.BodyHandlers.ofByteArray());
+
+        assertThat(resp.statusCode()).isEqualTo(200);
+        assertThat(resp.body()).isEqualTo(payload);
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/cluster/s3/S3VendorSmokeTest.java

@@ -0,0 +1,161 @@
+package stirling.software.proprietary.cluster.s3;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.ByteArrayInputStream;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.testcontainers.containers.localstack.LocalStackContainer;
+import org.testcontainers.junit.jupiter.Testcontainers;
+import org.testcontainers.utility.DockerImageName;
+
+import stirling.software.common.cluster.FileStore;
+import stirling.software.common.model.ApplicationProperties;
+
+import software.amazon.awssdk.core.sync.RequestBody;
+import software.amazon.awssdk.services.s3.model.S3Exception;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
+import software.amazon.awssdk.services.s3.presigner.model.PresignedGetObjectRequest;
+
+/**
+ * End-to-end smoke against the full {@link S3Clients#build} path. Defaults to a LocalStack
+ * container so it runs in CI; if {@code S3_SMOKE_ENDPOINT} is set, swaps in a real vendor (AWS /
+ * Supabase / R2 / MinIO over network) to validate live signing + DNS.
+ */
+@Testcontainers(disabledWithoutDocker = true)
+class S3VendorSmokeTest {
+
+    private static LocalStackContainer localstack;
+    private static S3Clients.Bundle bundle;
+    private static String bucket;
+    private static String vendorLabel;
+
+    @BeforeAll
+    static void setUp() {
+        ApplicationProperties.Storage.S3 cfg = new ApplicationProperties.Storage.S3();
+        String envEndpoint = System.getenv("S3_SMOKE_ENDPOINT");
+
+        if (envEndpoint != null && !envEndpoint.isBlank()) {
+            vendorLabel = System.getenv().getOrDefault("S3_SMOKE_LABEL", "external");
+            cfg.setEndpoint(envEndpoint);
+            cfg.setBucket(requireEnv("S3_SMOKE_BUCKET"));
+            cfg.setRegion(System.getenv().getOrDefault("S3_SMOKE_REGION", "us-east-1"));
+            cfg.setAccessKey(requireEnv("S3_SMOKE_KEY"));
+            cfg.setSecretKey(requireEnv("S3_SMOKE_SECRET"));
+            cfg.setPathStyleAccess(
+                    Boolean.parseBoolean(
+                            System.getenv().getOrDefault("S3_SMOKE_PATHSTYLE", "false")));
+            cfg.setAllowPrivateEndpoints(
+                    Boolean.parseBoolean(
+                            System.getenv().getOrDefault("S3_SMOKE_ALLOWPRIVATE", "false")));
+        } else {
+            vendorLabel = "localstack";
+            localstack =
+                    new LocalStackContainer(DockerImageName.parse("localstack/localstack:3.8"))
+                            .withServices(LocalStackContainer.Service.S3);
+            localstack.start();
+            cfg.setEndpoint(
+                    localstack.getEndpointOverride(LocalStackContainer.Service.S3).toString());
+            cfg.setBucket("stirling-smoke");
+            cfg.setRegion(localstack.getRegion());
+            cfg.setAccessKey(localstack.getAccessKey());
+            cfg.setSecretKey(localstack.getSecretKey());
+            // Exercise virtual-hosted addressing where possible. LocalStack supports both;
+            // path-style remains covered by the MinIO suite.
+            cfg.setPathStyleAccess(false);
+            // Required: localhost is a loopback address and would otherwise be rejected.
+            cfg.setAllowPrivateEndpoints(true);
+        }
+
+        bundle = S3Clients.build(cfg, "vendor-smoke[" + vendorLabel + "]");
+        bucket = cfg.getBucket();
+        ensureBucketExists(bucket);
+    }
+
+    @AfterAll
+    static void tearDown() {
+        if (bundle != null) {
+            bundle.close();
+        }
+        if (localstack != null) {
+            localstack.stop();
+        }
+    }
+
+    @Test
+    void s3FileStore_roundTripsContentAgainstVendor() throws Exception {
+        S3FileStore store = new S3FileStore(bundle.client(), bucket, "smoke/", false);
+        byte[] payload = ("hello from " + vendorLabel).getBytes(StandardCharsets.UTF_8);
+
+        FileStore.Stored stored =
+                store.store(new ByteArrayInputStream(payload), "smoke-payload.txt");
+        try {
+            assertThat(stored.size()).isEqualTo(payload.length);
+            assertThat(store.exists(stored.fileId())).isTrue();
+            assertThat(store.size(stored.fileId())).isEqualTo(payload.length);
+            assertThat(store.retrieveBytes(stored.fileId())).isEqualTo(payload);
+        } finally {
+            assertThat(store.delete(stored.fileId())).isTrue();
+            assertThat(store.exists(stored.fileId())).isFalse();
+        }
+    }
+
+    @Test
+    void presignedGet_downloadsContentOverHttp() throws Exception {
+        String key = "smoke/presign-" + System.currentTimeMillis() + ".txt";
+        byte[] payload = ("presigned by " + vendorLabel).getBytes(StandardCharsets.UTF_8);
+
+        bundle.client().putObject(p -> p.bucket(bucket).key(key), RequestBody.fromBytes(payload));
+        try {
+            PresignedGetObjectRequest presigned =
+                    bundle.presigner()
+                            .presignGetObject(
+                                    GetObjectPresignRequest.builder()
+                                            .signatureDuration(Duration.ofMinutes(5))
+                                            .getObjectRequest(g -> g.bucket(bucket).key(key))
+                                            .build());
+
+            HttpResponse<byte[]> resp =
+                    HttpClient.newHttpClient()
+                            .send(
+                                    HttpRequest.newBuilder(presigned.url().toURI()).GET().build(),
+                                    HttpResponse.BodyHandlers.ofByteArray());
+
+            assertThat(resp.statusCode()).isEqualTo(200);
+            assertThat(resp.body()).isEqualTo(payload);
+        } finally {
+            bundle.client().deleteObject(d -> d.bucket(bucket).key(key));
+        }
+    }
+
+    private static String requireEnv(String name) {
+        String value = System.getenv(name);
+        if (value == null || value.isBlank()) {
+            throw new IllegalStateException(
+                    name + " env var must be set when S3_SMOKE_ENDPOINT is set");
+        }
+        return value;
+    }
+
+    private static void ensureBucketExists(String b) {
+        try {
+            bundle.client().headBucket(h -> h.bucket(b));
+        } catch (S3Exception e) {
+            if (e.statusCode() == 404 || e.statusCode() == 301 || e.statusCode() == 400) {
+                try {
+                    bundle.client().createBucket(c -> c.bucket(b));
+                } catch (S3Exception ignored) {
+                    // Bucket already exists or vendor disallows runtime create (Supabase/R2 often
+                    // require pre-create). Caller is expected to have pre-created it in that case.
+                }
+            }
+        }
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/security/configuration/ee/EEAppConfigTest.java

@@ -0,0 +1,59 @@
+package stirling.software.proprietary.security.configuration.ee;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.Test;
+
+import stirling.software.common.model.ApplicationProperties;
+
+class EEAppConfigTest {
+
+    @Test
+    void ssoAutoLogin_disabled_returnsFalse_andDoesNotConsultLicense() {
+        ApplicationProperties props = new ApplicationProperties();
+        props.getPremium().getProFeatures().setSsoAutoLogin(false);
+        LicenseKeyChecker checker = mock(LicenseKeyChecker.class);
+
+        EEAppConfig cfg = new EEAppConfig(props, checker);
+
+        assertThat(cfg.ssoAutoLogin()).isFalse();
+        verifyNoInteractions(checker);
+    }
+
+    @Test
+    void ssoAutoLogin_enabled_withProLicense_returnsTrue() {
+        ApplicationProperties props = new ApplicationProperties();
+        props.getPremium().getProFeatures().setSsoAutoLogin(true);
+        LicenseKeyChecker checker = mock(LicenseKeyChecker.class);
+        when(checker.getPremiumLicenseEnabledResult())
+                .thenReturn(KeygenLicenseVerifier.License.SERVER);
+
+        EEAppConfig cfg = new EEAppConfig(props, checker);
+
+        assertThat(cfg.ssoAutoLogin()).isTrue();
+    }
+
+    @Test
+    void ssoAutoLogin_enabled_withoutLicense_throwsAtBootTime() {
+        ApplicationProperties props = new ApplicationProperties();
+        props.getPremium().getProFeatures().setSsoAutoLogin(true);
+        LicenseKeyChecker checker = mock(LicenseKeyChecker.class);
+        // Real LicenseKeyChecker.requireProOrEnterprise throws on NORMAL; mock that behavior here.
+        org.mockito.Mockito.doThrow(
+                        new IllegalStateException(
+                                "premium.proFeatures.ssoAutoLogin=true requires a Pro or Enterprise license"))
+                .when(checker)
+                .requireProOrEnterprise("premium.proFeatures.ssoAutoLogin=true");
+
+        EEAppConfig cfg = new EEAppConfig(props, checker);
+
+        assertThatThrownBy(cfg::ssoAutoLogin)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining(
+                        "premium.proFeatures.ssoAutoLogin=true requires a Pro or Enterprise license");
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/security/configuration/ee/LicenseKeyCheckerTest.java

@@ -1,5 +1,7 @@
 package stirling.software.proprietary.security.configuration.ee;
 
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoInteractions;
@@ -86,4 +88,43 @@ class LicenseKeyCheckerTest {
         assertEquals(License.NORMAL, checker.getPremiumLicenseEnabledResult());
         verifyNoInteractions(verifier);
     }
+
+    // ----- requireProOrEnterprise: shared boot-time gate for premium features -----
+
+    @Test
+    void requireProOrEnterprise_normalLicense_throwsWithFeatureName() {
+        LicenseKeyChecker checker = checkerWithLicense(License.NORMAL);
+        assertThatThrownBy(() -> checker.requireProOrEnterprise("storage.provider=s3"))
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("storage.provider=s3 requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void requireProOrEnterprise_serverLicense_passes() {
+        LicenseKeyChecker checker = checkerWithLicense(License.SERVER);
+        assertThatCode(() -> checker.requireProOrEnterprise("any.feature=true"))
+                .doesNotThrowAnyException();
+    }
+
+    @Test
+    void requireProOrEnterprise_enterpriseLicense_passes() {
+        LicenseKeyChecker checker = checkerWithLicense(License.ENTERPRISE);
+        assertThatCode(() -> checker.requireProOrEnterprise("any.feature=true"))
+                .doesNotThrowAnyException();
+    }
+
+    private LicenseKeyChecker checkerWithLicense(License level) {
+        ApplicationProperties props = new ApplicationProperties();
+        if (level == License.NORMAL) {
+            props.getPremium().setEnabled(false);
+        } else {
+            props.getPremium().setEnabled(true);
+            props.getPremium().setKey("any");
+            when(verifier.verifyLicense("any")).thenReturn(level);
+        }
+        LicenseKeyChecker checker =
+                new LicenseKeyChecker(verifier, props, userLicenseSettingsService);
+        checker.init();
+        return checker;
+    }
 }

app/proprietary/src/test/java/stirling/software/proprietary/security/service/CustomOAuth2UserServiceDebugLoggingTest.java

@@ -0,0 +1,221 @@
+package stirling.software.proprietary.security.service;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.when;
+
+import java.lang.reflect.Field;
+import java.time.Instant;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.slf4j.LoggerFactory;
+import org.springframework.security.oauth2.client.oidc.userinfo.OidcUserRequest;
+import org.springframework.security.oauth2.client.oidc.userinfo.OidcUserService;
+import org.springframework.security.oauth2.client.registration.ClientRegistration;
+import org.springframework.security.oauth2.core.AuthorizationGrantType;
+import org.springframework.security.oauth2.core.OAuth2AuthenticationException;
+import org.springframework.security.oauth2.core.oidc.IdTokenClaimNames;
+import org.springframework.security.oauth2.core.oidc.OidcIdToken;
+import org.springframework.security.oauth2.core.oidc.user.DefaultOidcUser;
+
+import stirling.software.common.model.ApplicationProperties;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.read.ListAppender;
+
+/**
+ * Verifies the opt-in OAuth2/OIDC claim-dump diagnostic logging added to {@link
+ * CustomOAuth2UserService} for troubleshooting provider misconfiguration (e.g. ADFS not emitting an
+ * {@code email} claim).
+ */
+@ExtendWith(MockitoExtension.class)
+class CustomOAuth2UserServiceDebugLoggingTest {
+
+    @Mock private UserService userService;
+    @Mock private LoginAttemptService loginAttemptService;
+    @Mock private OidcUserRequest userRequest;
+
+    private ListAppender<ILoggingEvent> appender;
+    private Logger serviceLogger;
+
+    @BeforeEach
+    void attachLogCapture() {
+        serviceLogger = (Logger) LoggerFactory.getLogger(CustomOAuth2UserService.class);
+        appender = new ListAppender<>();
+        appender.start();
+        serviceLogger.addAppender(appender);
+        // Make sure INFO-level dumps reach the appender even if the default config is WARN+.
+        serviceLogger.setLevel(Level.DEBUG);
+    }
+
+    @AfterEach
+    void detachLogCapture() {
+        serviceLogger.detachAppender(appender);
+        appender.stop();
+    }
+
+    @Test
+    void whenDebugLoggingOff_failureProducesNoClaimDump() throws Exception {
+        ApplicationProperties.Security.OAUTH2 props = oauthProps("email", false);
+        CustomOAuth2UserService service =
+                new CustomOAuth2UserService(props, userService, loginAttemptService);
+        // Provider gave us claims, but no "email" — same shape as the ADFS bug report.
+        Map<String, Object> claims = baseClaims();
+        claims.put("upn", "jdoe@demarest.com.br");
+        replaceDelegateWithStub(service, claims);
+        lenient()
+                .when(userRequest.getIdToken())
+                .thenReturn(new OidcIdToken("token", Instant.now(), Instant.MAX, claims));
+        lenient().when(userRequest.getClientRegistration()).thenReturn(stubRegistration());
+
+        assertThrows(OAuth2AuthenticationException.class, () -> service.loadUser(userRequest));
+
+        assertThat(appender.list)
+                .as("no debug dump should appear when debugLogging=false")
+                .noneMatch(e -> e.getFormattedMessage().contains("[OAUTH2 DEBUG]"));
+    }
+
+    @Test
+    void whenDebugLoggingOn_failureDumpsClaimsAndSuggestsAlternative() throws Exception {
+        ApplicationProperties.Security.OAUTH2 props = oauthProps("email", true);
+        CustomOAuth2UserService service =
+                new CustomOAuth2UserService(props, userService, loginAttemptService);
+        Map<String, Object> claims = adfsStyleClaims();
+        // ADFS-style: no `email`, but `preferred_username` IS a valid UsernameAttribute value.
+        claims.put("preferred_username", "jdoe@demarest.com.br");
+        // `upn` is NOT in UsernameAttribute, so it must NOT appear in the suggestion hint.
+        claims.put("upn", "jdoe@demarest.com.br");
+        replaceDelegateWithStub(service, claims);
+        lenient()
+                .when(userRequest.getIdToken())
+                .thenReturn(new OidcIdToken("token", Instant.now(), Instant.MAX, claims));
+        lenient().when(userRequest.getClientRegistration()).thenReturn(stubRegistration());
+
+        assertThrows(OAuth2AuthenticationException.class, () -> service.loadUser(userRequest));
+
+        List<ILoggingEvent> dumps =
+                appender.list.stream()
+                        .filter(e -> e.getFormattedMessage().contains("[OAUTH2 DEBUG]"))
+                        .toList();
+        assertThat(dumps).as("expected at least one debug-dump log line").isNotEmpty();
+
+        String combined =
+                String.join("\n", dumps.stream().map(ILoggingEvent::getFormattedMessage).toList());
+        assertThat(combined)
+                .contains("Provider registrationId : demarest")
+                .contains("Configured useAsUsername: email")
+                .contains("preferred_username")
+                .contains("upn = jdoe@demarest.com.br")
+                .contains("<NULL — this is why login fails>");
+        // The hint must include 'preferred_username' (a valid UsernameAttribute value present
+        // in the claims) and MUST NOT include 'upn' (not in the UsernameAttribute enum).
+        String hintLine =
+                combined.lines()
+                        .filter(l -> l.contains("Hint:"))
+                        .findFirst()
+                        .orElseThrow(() -> new AssertionError("no Hint: line in dump"));
+        assertThat(hintLine).contains("preferred_username").doesNotContain("upn");
+    }
+
+    @Test
+    void invalidUseAsUsername_isWrappedAsOAuth2AuthenticationException() {
+        // Regression: an earlier draft moved UsernameAttribute.valueOf(...) outside the try/catch,
+        // so a typo'd or null useAsUsername leaked as a raw IllegalArgumentException instead of
+        // being wrapped, breaking Spring's authentication exception handling. This test pins the
+        // post-fix behaviour: valueOf() failures stay inside the guarded section.
+        ApplicationProperties.Security.OAUTH2 props = oauthProps("not_a_real_attribute", true);
+        CustomOAuth2UserService service =
+                new CustomOAuth2UserService(props, userService, loginAttemptService);
+        lenient().when(userRequest.getClientRegistration()).thenReturn(stubRegistration());
+        // No need to stub the OIDC delegate — control flow shouldn't reach it.
+
+        OAuth2AuthenticationException thrown =
+                assertThrows(
+                        OAuth2AuthenticationException.class, () -> service.loadUser(userRequest));
+        assertThat(thrown.getCause()).isInstanceOf(IllegalArgumentException.class);
+        // We deliberately do NOT emit the claim dump in this case (we have no resolved
+        // usernameAttributeKey to compare against, and the IllegalArgumentException message
+        // already explains the misconfiguration).
+        assertThat(appender.list)
+                .as("no claim dump when useAsUsername itself is invalid")
+                .noneMatch(e -> e.getFormattedMessage().contains("[OAUTH2 DEBUG]"));
+    }
+
+    // ---------- helpers ----------
+
+    private static ApplicationProperties.Security.OAUTH2 oauthProps(
+            String useAsUsername, boolean debugLogging) {
+        ApplicationProperties.Security.OAUTH2 p = new ApplicationProperties.Security.OAUTH2();
+        p.setEnabled(true);
+        p.setUseAsUsername(useAsUsername);
+        p.setDebugLogging(debugLogging);
+        return p;
+    }
+
+    private static Map<String, Object> baseClaims() {
+        Map<String, Object> claims = new LinkedHashMap<>();
+        claims.put(IdTokenClaimNames.SUB, "abc-123");
+        claims.put(IdTokenClaimNames.ISS, "https://sts.example.com/adfs");
+        claims.put(IdTokenClaimNames.AUD, Collections.singletonList("client-id"));
+        claims.put(IdTokenClaimNames.IAT, Instant.now());
+        claims.put(IdTokenClaimNames.EXP, Instant.now().plusSeconds(3600));
+        claims.put("given_name", "Jane");
+        claims.put("family_name", "Doe");
+        return claims;
+    }
+
+    /**
+     * ADFS-style claim set with {@code given_name}/{@code family_name} removed, so the suggestion
+     * hint test isolates a single expected UsernameAttribute value.
+     */
+    private static Map<String, Object> adfsStyleClaims() {
+        Map<String, Object> claims = baseClaims();
+        claims.remove("given_name");
+        claims.remove("family_name");
+        return claims;
+    }
+
+    private static ClientRegistration stubRegistration() {
+        return ClientRegistration.withRegistrationId("demarest")
+                .clientId("client-id")
+                .clientSecret("client-secret")
+                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
+                .redirectUri("https://app.example.com/login/oauth2/code/demarest")
+                .authorizationUri("https://sts.example.com/adfs/oauth2/authorize")
+                .tokenUri("https://sts.example.com/adfs/oauth2/token")
+                .jwkSetUri("https://sts.example.com/adfs/discovery/keys")
+                .build();
+    }
+
+    /**
+     * Swap the private {@code delegate} field on {@link CustomOAuth2UserService} for a stub that
+     * returns a {@link DefaultOidcUser} built from the supplied claims. Lets us drive the test
+     * without standing up a real OIDC provider.
+     */
+    private void replaceDelegateWithStub(
+            CustomOAuth2UserService service, Map<String, Object> claims) throws Exception {
+        OidcIdToken idToken =
+                new OidcIdToken("raw-token", Instant.now(), Instant.MAX, new HashMap<>(claims));
+        DefaultOidcUser delegateUser =
+                new DefaultOidcUser(Collections.emptyList(), idToken, IdTokenClaimNames.SUB);
+        OidcUserService delegateMock = org.mockito.Mockito.mock(OidcUserService.class);
+        when(delegateMock.loadUser(any())).thenReturn(delegateUser);
+        Field f = CustomOAuth2UserService.class.getDeclaredField("delegate");
+        f.setAccessible(true);
+        f.set(service, delegateMock);
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/service/AiWorkflowServiceTest.java

@@ -49,6 +49,7 @@ import stirling.software.common.service.FileStorage;
 import stirling.software.common.service.FileStorage.StoredFile;
 import stirling.software.common.service.InternalApiClient;
 import stirling.software.common.service.InternalApiTimeoutException;
+import stirling.software.common.service.PyMuPdfConverter;
 import stirling.software.common.service.ToolMetadataService;
 import stirling.software.common.util.TempFileManager;
 import stirling.software.common.util.TempFileRegistry;
@@ -85,6 +86,7 @@ class AiWorkflowServiceTest {
     @Mock private ToolMetadataService toolMetadataService;
     @Mock private FileIdStrategy fileIdStrategy;
     @Mock private AiEngineEndpointResolver endpointResolver;
+    @Mock private PyMuPdfConverter pyMuPdfConverter;
 
     @TempDir Path tempDir;
 
@@ -117,7 +119,8 @@ class AiWorkflowServiceTest {
                         toolMetadataService,
                         tempFileManager,
                         fileIdStrategy,
-                        endpointResolver);
+                        endpointResolver,
+                        pyMuPdfConverter);
         when(endpointResolver.getEnabledEndpointUrls()).thenReturn(List.of());
     }
 

app/proprietary/src/test/java/stirling/software/proprietary/storage/config/ClusterStorageGateTest.java

@@ -0,0 +1,250 @@
+package stirling.software.proprietary.storage.config;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.lang.reflect.Field;
+
+import org.junit.jupiter.api.Test;
+
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.configuration.ee.KeygenLicenseVerifier.License;
+import stirling.software.proprietary.security.configuration.ee.LicenseKeyChecker;
+
+class ClusterStorageGateTest {
+
+    @Test
+    void clusterDisabled_localStorage_passes() {
+        ClusterStorageGate gate = newGate(false, true, "local", "local");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterDisabled_s3Storage_passes() {
+        ClusterStorageGate gate = newGate(false, true, "s3", "local");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterEnabled_storageDisabled_butArtifactStoreLocal_fails() {
+        ClusterStorageGate gate = newGate(true, false, "local", "local");
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("cluster.artifactStore=local");
+    }
+
+    @Test
+    void clusterEnabled_storageDisabled_artifactStoreS3_passes() {
+        ClusterStorageGate gate = newGate(true, false, "local", "s3");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterEnabled_localStorage_fails() {
+        ClusterStorageGate gate = newGate(true, true, "local", "s3");
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("storage.provider=local")
+                .hasMessageContaining("storage.provider=s3")
+                .hasMessageContaining("storage.provider=database");
+    }
+
+    @Test
+    void clusterEnabled_localStorage_caseInsensitive_fails() {
+        ClusterStorageGate gate = newGate(true, true, "LOCAL", "s3");
+        assertThatThrownBy(gate::validate).isInstanceOf(IllegalStateException.class);
+    }
+
+    @Test
+    void clusterEnabled_nullProvider_treatedAsLocal_fails() {
+        ClusterStorageGate gate = newGate(true, true, null, "s3");
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("storage.provider=local");
+    }
+
+    @Test
+    void clusterEnabled_s3Storage_andArtifactStoreS3_passes() {
+        ClusterStorageGate gate = newGate(true, true, "s3", "s3");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterEnabled_databaseStorage_andArtifactStoreS3_passes() {
+        ClusterStorageGate gate = newGate(true, true, "database", "s3");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterEnabled_s3Storage_butLocalArtifactStore_fails() {
+        ClusterStorageGate gate = newGate(true, true, "s3", "local");
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("cluster.artifactStore=local");
+    }
+
+    @Test
+    void clusterEnabled_localArtifactStore_caseInsensitive_fails() {
+        ClusterStorageGate gate = newGate(true, true, "s3", "LOCAL");
+        assertThatThrownBy(gate::validate).isInstanceOf(IllegalStateException.class);
+    }
+
+    @Test
+    void clusterEnabled_nullArtifactStore_treatedAsLocal_fails() {
+        ClusterStorageGate gate = newGate(true, true, "s3", null);
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("cluster.artifactStore=local");
+    }
+
+    @Test
+    void clusterEnabled_nullStorageObject_passesProviderCheck_butArtifactStoreStillEvaluated() {
+        ApplicationProperties props = new ApplicationProperties();
+        props.setStorage(null);
+        ClusterStorageGate gate = new ClusterStorageGate(props, mockLicenseChecker(License.SERVER));
+        setClusterEnabled(gate, true);
+        setClusterArtifactStore(gate, "s3");
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    // ----- License gating for premium storage backends -----
+
+    @Test
+    void storageProviderS3_withoutProLicense_throws() {
+        ClusterStorageGate gate = newGate(false, true, "s3", "local", License.NORMAL);
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("storage.provider=s3 requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void storageProviderDatabase_withoutProLicense_throws() {
+        ClusterStorageGate gate = newGate(false, true, "database", "local", License.NORMAL);
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining(
+                        "storage.provider=database requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void storageProviderS3_withServerLicense_passes() {
+        ClusterStorageGate gate = newGate(false, true, "s3", "local", License.SERVER);
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void storageProviderS3_withEnterpriseLicense_passes() {
+        ClusterStorageGate gate = newGate(false, true, "s3", "local", License.ENTERPRISE);
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void storageProviderDatabase_withServerLicense_passes() {
+        ClusterStorageGate gate = newGate(false, true, "database", "local", License.SERVER);
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void clusterArtifactStoreS3_withoutProLicense_throws() {
+        ClusterStorageGate gate = newGate(false, false, "local", "s3", License.NORMAL);
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining(
+                        "cluster.artifactStore=s3 requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void clusterArtifactStoreS3_withServerLicense_passes() {
+        ClusterStorageGate gate = newGate(false, false, "local", "s3", License.SERVER);
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void localOnly_normalLicense_passes_licenseNotChecked() {
+        ClusterStorageGate gate = newGate(false, true, "local", "local", License.NORMAL);
+        assertThatCode(gate::validate).doesNotThrowAnyException();
+    }
+
+    @Test
+    void storageDisabled_butArtifactStoreS3_withoutLicense_stillThrows() {
+        ClusterStorageGate gate = newGate(false, false, "local", "s3", License.NORMAL);
+        assertThatThrownBy(gate::validate)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("cluster.artifactStore=s3");
+    }
+
+    private static ClusterStorageGate newGate(
+            boolean clusterEnabled,
+            boolean storageEnabled,
+            String provider,
+            String clusterArtifactStore) {
+        // Default to a SERVER license so existing tests (which assert clustering / artifact-store
+        // rules independently of license) continue to pass. License-specific tests below build
+        // gates with explicit license tiers.
+        return newGate(
+                clusterEnabled, storageEnabled, provider, clusterArtifactStore, License.SERVER);
+    }
+
+    private static ClusterStorageGate newGate(
+            boolean clusterEnabled,
+            boolean storageEnabled,
+            String provider,
+            String clusterArtifactStore,
+            License license) {
+        ApplicationProperties props = new ApplicationProperties();
+        ApplicationProperties.Storage storage = new ApplicationProperties.Storage();
+        storage.setEnabled(storageEnabled);
+        storage.setProvider(provider);
+        props.setStorage(storage);
+        LicenseKeyChecker checker = mockLicenseChecker(license);
+        ClusterStorageGate gate = new ClusterStorageGate(props, checker);
+        setClusterEnabled(gate, clusterEnabled);
+        setClusterArtifactStore(gate, clusterArtifactStore);
+        return gate;
+    }
+
+    private static LicenseKeyChecker mockLicenseChecker(License license) {
+        LicenseKeyChecker checker = mock(LicenseKeyChecker.class);
+        when(checker.getPremiumLicenseEnabledResult()).thenReturn(license);
+        if (license == License.SERVER || license == License.ENTERPRISE) {
+            doNothing().when(checker).requireProOrEnterprise(anyString());
+        } else {
+            // Mirror real LicenseKeyChecker.requireProOrEnterprise so message assertions match.
+            org.mockito.Mockito.doAnswer(
+                            inv -> {
+                                throw new IllegalStateException(
+                                        inv.getArgument(0)
+                                                + " requires a Pro or Enterprise license");
+                            })
+                    .when(checker)
+                    .requireProOrEnterprise(anyString());
+        }
+        return checker;
+    }
+
+    private static void setClusterEnabled(ClusterStorageGate gate, boolean enabled) {
+        try {
+            Field f = ClusterStorageGate.class.getDeclaredField("clusterEnabled");
+            f.setAccessible(true);
+            f.setBoolean(gate, enabled);
+            assertThat(f.getBoolean(gate)).isEqualTo(enabled);
+        } catch (ReflectiveOperationException e) {
+            throw new AssertionError("Failed to set clusterEnabled via reflection", e);
+        }
+    }
+
+    private static void setClusterArtifactStore(ClusterStorageGate gate, String value) {
+        try {
+            Field f = ClusterStorageGate.class.getDeclaredField("clusterArtifactStore");
+            f.setAccessible(true);
+            f.set(gate, value);
+        } catch (ReflectiveOperationException e) {
+            throw new AssertionError("Failed to set clusterArtifactStore via reflection", e);
+        }
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/storage/config/StorageProviderConfigTest.java

@@ -0,0 +1,116 @@
+package stirling.software.proprietary.storage.config;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.doNothing;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import org.junit.jupiter.api.Test;
+
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.configuration.ee.KeygenLicenseVerifier.License;
+import stirling.software.proprietary.security.configuration.ee.LicenseKeyChecker;
+import stirling.software.proprietary.storage.provider.LocalStorageProvider;
+import stirling.software.proprietary.storage.provider.StorageProvider;
+import stirling.software.proprietary.storage.repository.StoredFileBlobRepository;
+
+/**
+ * Verifies the Pro/Enterprise license gate on the S3 storage backend without touching real S3
+ * clients (and without needing Docker). Provider-specific construction is delegated to the existing
+ * provider tests.
+ */
+class StorageProviderConfigTest {
+
+    @Test
+    void provider_local_normalLicense_buildsLocalProviderWithoutLicenseCheck() {
+        StorageProviderConfig cfg = newConfig("local", License.NORMAL);
+
+        StorageProvider provider = cfg.storageProvider();
+        assertThat(provider).isInstanceOf(LocalStorageProvider.class);
+    }
+
+    @Test
+    void provider_s3_normalLicense_throwsBeforeBuildingClient() {
+        StorageProviderConfig cfg = newConfig("s3", License.NORMAL);
+
+        // License check must throw BEFORE S3Clients.build tries to validate endpoint / bucket.
+        // Otherwise an empty config would surface as a confusing "bucket must be set" error.
+        assertThatThrownBy(cfg::storageProvider)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("storage.provider=s3 requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void provider_database_normalLicense_throws() {
+        StorageProviderConfig cfg = newConfig("database", License.NORMAL);
+
+        assertThatThrownBy(cfg::storageProvider)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining(
+                        "storage.provider=database requires a Pro or Enterprise license");
+    }
+
+    @Test
+    void provider_database_serverLicense_buildsDatabaseProvider() {
+        StorageProviderConfig cfg = newConfig("database", License.SERVER);
+        assertThatCode(cfg::storageProvider).doesNotThrowAnyException();
+    }
+
+    @Test
+    void provider_s3_serverLicense_passesLicenseCheck_thenFailsOnEmptyConfig() {
+        StorageProviderConfig cfg = newConfig("s3", License.SERVER);
+
+        // Valid license, but no bucket/endpoint configured - so we expect a CONFIG error,
+        // not a license error. The error message must not mention the license.
+        assertThatThrownBy(cfg::storageProvider)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageNotContaining("Pro or Enterprise license");
+    }
+
+    @Test
+    void provider_s3_enterpriseLicense_passesLicenseCheck_thenFailsOnEmptyConfig() {
+        StorageProviderConfig cfg = newConfig("s3", License.ENTERPRISE);
+
+        assertThatThrownBy(cfg::storageProvider)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageNotContaining("Pro or Enterprise license");
+    }
+
+    @Test
+    void provider_unknown_normalLicense_throwsUnsupportedProvider_notLicense() {
+        StorageProviderConfig cfg = newConfig("magic", License.NORMAL);
+
+        assertThatThrownBy(cfg::storageProvider)
+                .isInstanceOf(IllegalStateException.class)
+                .hasMessageContaining("Storage provider not supported: magic")
+                .hasMessageNotContaining("license");
+    }
+
+    private static StorageProviderConfig newConfig(String provider, License license) {
+        ApplicationProperties props = new ApplicationProperties();
+        props.getStorage().setProvider(provider);
+        props.getStorage()
+                .setEnabled(false); // local-fallback path skips dir creation when disabled
+        StoredFileBlobRepository repo = mock(StoredFileBlobRepository.class);
+        LicenseKeyChecker checker = mock(LicenseKeyChecker.class);
+        when(checker.getPremiumLicenseEnabledResult()).thenReturn(license);
+        if (license == License.SERVER || license == License.ENTERPRISE) {
+            doNothing().when(checker).requireProOrEnterprise(anyString());
+        } else {
+            // Mirror real LicenseKeyChecker.requireProOrEnterprise so message assertions match.
+            doAnswer(
+                            inv -> {
+                                throw new IllegalStateException(
+                                        inv.getArgument(0)
+                                                + " requires a Pro or Enterprise license");
+                            })
+                    .when(checker)
+                    .requireProOrEnterprise(anyString());
+        }
+        return new StorageProviderConfig(props, repo, checker);
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/storage/controller/FileStorageControllerTest.java

@@ -0,0 +1,130 @@
+package stirling.software.proprietary.storage.controller;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.net.URI;
+import java.time.Duration;
+import java.util.Optional;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import stirling.software.proprietary.security.model.User;
+import stirling.software.proprietary.storage.model.StoredFile;
+import stirling.software.proprietary.storage.provider.StorageProvider;
+import stirling.software.proprietary.storage.service.FileStorageService;
+
+@ExtendWith(MockitoExtension.class)
+class FileStorageControllerTest {
+
+    private static final String SIGNED_URL =
+            "https://test-bucket.s3.example.com/signed-blob?X-Amz-Signature=abc";
+
+    @Mock private FileStorageService fileStorageService;
+    @Mock private StorageProvider storageProvider;
+
+    private MockMvc mockMvc;
+
+    @BeforeEach
+    void setUp() {
+        FileStorageController controller =
+                new FileStorageController(fileStorageService, storageProvider);
+        mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
+    }
+
+    @Test
+    void downloadFile_whenProviderReturnsSignedUrl_returns302RedirectWithoutSessionCredentials()
+            throws Exception {
+        StoredFile file = newStoredFile();
+
+        when(fileStorageService.requireAuthenticatedUser()).thenReturn(file.getOwner());
+        when(fileStorageService.getAccessibleFile(file.getOwner(), 77L)).thenReturn(file);
+        when(storageProvider.signedDownloadUrl(
+                        eq("11/abc-doc.pdf"), any(Duration.class), anyBoolean(), anyString()))
+                .thenReturn(Optional.of(URI.create(SIGNED_URL)));
+
+        MvcResult result =
+                mockMvc.perform(get("/api/v1/storage/files/{fileId}/download", 77L))
+                        .andExpect(status().is(HttpStatus.FOUND.value()))
+                        .andExpect(header().string(HttpHeaders.LOCATION, SIGNED_URL))
+                        .andExpect(redirectedUrl(SIGNED_URL))
+                        .andReturn();
+
+        // Regression fence: signed URLs delegate auth to the URL itself, so the redirect
+        // response must NOT carry any session credentials forward.
+        assertThat(result.getResponse().getHeader(HttpHeaders.AUTHORIZATION)).isNull();
+        assertThat(result.getResponse().getHeader(HttpHeaders.COOKIE)).isNull();
+        assertThat(result.getResponse().getHeader(HttpHeaders.SET_COOKIE)).isNull();
+    }
+
+    @Test
+    void downloadFile_inlineFalse_forwardsAttachmentDispositionToSignedUrl() throws Exception {
+        StoredFile file = newStoredFile();
+
+        when(fileStorageService.requireAuthenticatedUser()).thenReturn(file.getOwner());
+        when(fileStorageService.getAccessibleFile(file.getOwner(), 77L)).thenReturn(file);
+        when(storageProvider.signedDownloadUrl(
+                        eq("11/abc-doc.pdf"), any(Duration.class), eq(false), eq("doc.pdf")))
+                .thenReturn(Optional.of(URI.create(SIGNED_URL)));
+
+        mockMvc.perform(get("/api/v1/storage/files/{fileId}/download", 77L))
+                .andExpect(status().is(HttpStatus.FOUND.value()))
+                .andExpect(header().string(HttpHeaders.LOCATION, SIGNED_URL));
+
+        verify(storageProvider)
+                .signedDownloadUrl(
+                        eq("11/abc-doc.pdf"), any(Duration.class), eq(false), eq("doc.pdf"));
+    }
+
+    @Test
+    void downloadFile_inlineTrue_forwardsInlineDispositionToSignedUrl() throws Exception {
+        StoredFile file = newStoredFile();
+
+        when(fileStorageService.requireAuthenticatedUser()).thenReturn(file.getOwner());
+        when(fileStorageService.getAccessibleFile(file.getOwner(), 77L)).thenReturn(file);
+        when(storageProvider.signedDownloadUrl(
+                        eq("11/abc-doc.pdf"), any(Duration.class), eq(true), eq("doc.pdf")))
+                .thenReturn(Optional.of(URI.create(SIGNED_URL)));
+
+        mockMvc.perform(get("/api/v1/storage/files/{fileId}/download", 77L).param("inline", "true"))
+                .andExpect(status().is(HttpStatus.FOUND.value()))
+                .andExpect(header().string(HttpHeaders.LOCATION, SIGNED_URL));
+
+        verify(storageProvider)
+                .signedDownloadUrl(
+                        eq("11/abc-doc.pdf"), any(Duration.class), eq(true), eq("doc.pdf"));
+    }
+
+    private static StoredFile newStoredFile() {
+        User user = new User();
+        user.setId(11L);
+        user.setUsername("alice");
+
+        StoredFile file = new StoredFile();
+        file.setId(77L);
+        file.setOwner(user);
+        file.setOriginalFilename("doc.pdf");
+        file.setContentType("application/pdf");
+        file.setSizeBytes(123L);
+        file.setStorageKey("11/abc-doc.pdf");
+        return file;
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/storage/provider/S3StorageProviderTest.java

@@ -0,0 +1,282 @@
+package stirling.software.proprietary.storage.provider;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URI;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.Optional;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.springframework.core.io.Resource;
+import org.springframework.mock.web.MockMultipartFile;
+import org.testcontainers.containers.MinIOContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import stirling.software.proprietary.security.model.User;
+
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
+import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Client;
+import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.services.s3.model.CreateBucketRequest;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+
+@Testcontainers(disabledWithoutDocker = true)
+class S3StorageProviderTest {
+
+    private static final String BUCKET = "stirling-test-bucket";
+    private static final String ACCESS_KEY = "minioadmin";
+    private static final String SECRET_KEY = "minioadmin";
+
+    @Container
+    static MinIOContainer minio =
+            new MinIOContainer("minio/minio:latest")
+                    .withUserName(ACCESS_KEY)
+                    .withPassword(SECRET_KEY);
+
+    private static S3Client s3Client;
+    private static S3Presigner s3Presigner;
+    private static S3StorageProvider provider;
+
+    @BeforeAll
+    static void setUp() {
+        URI endpoint = URI.create(minio.getS3URL());
+        AwsBasicCredentials creds = AwsBasicCredentials.create(ACCESS_KEY, SECRET_KEY);
+        S3Configuration s3Config = S3Configuration.builder().pathStyleAccessEnabled(true).build();
+
+        s3Client =
+                S3Client.builder()
+                        .endpointOverride(endpoint)
+                        .httpClient(UrlConnectionHttpClient.create())
+                        .region(Region.US_EAST_1)
+                        .credentialsProvider(StaticCredentialsProvider.create(creds))
+                        .serviceConfiguration(s3Config)
+                        .build();
+
+        s3Presigner =
+                S3Presigner.builder()
+                        .endpointOverride(endpoint)
+                        .region(Region.US_EAST_1)
+                        .credentialsProvider(StaticCredentialsProvider.create(creds))
+                        .serviceConfiguration(s3Config)
+                        .build();
+
+        s3Client.createBucket(CreateBucketRequest.builder().bucket(BUCKET).build());
+        provider = new S3StorageProvider(s3Client, s3Presigner, BUCKET);
+    }
+
+    @AfterAll
+    static void tearDown() {
+        if (provider != null) {
+            provider.close();
+        }
+    }
+
+    @Test
+    void blankBucket_constructorRejects() {
+        assertThatThrownBy(() -> new S3StorageProvider(s3Client, s3Presigner, ""))
+                .isInstanceOf(IllegalArgumentException.class);
+        assertThatThrownBy(() -> new S3StorageProvider(s3Client, s3Presigner, null))
+                .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    void store_thenLoad_roundTripsContent() throws Exception {
+        User owner = new User();
+        owner.setId(42L);
+        byte[] content = "hello s3 round trip".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file =
+                new MockMultipartFile("file", "sample.pdf", "application/pdf", content);
+
+        StoredObject stored = provider.store(owner, file);
+
+        // Key is intentionally opaque ({ownerId}/{uuid}) - the filename is preserved on
+        // StoredObject.originalFilename for display, never in the S3 key, so vendors that
+        // restrict key charset (e.g. Supabase: ASCII only) accept any filename.
+        assertThat(stored.getStorageKey())
+                .matches(
+                        "42/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}");
+        assertThat(stored.getStorageKey()).doesNotContain("sample.pdf");
+        assertThat(stored.getOriginalFilename()).isEqualTo("sample.pdf");
+        assertThat(stored.getContentType()).isEqualTo("application/pdf");
+        assertThat(stored.getSizeBytes()).isEqualTo(content.length);
+
+        Resource loaded = provider.load(stored.getStorageKey());
+        try (InputStream in = loaded.getInputStream()) {
+            assertThat(in.readAllBytes()).isEqualTo(content);
+        }
+    }
+
+    @Test
+    void load_unknownKey_throwsIOException() {
+        assertThatThrownBy(() -> provider.load("does/not/exist.txt"))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void store_unicodeFilename_yieldsAsciiOnlyKey_andPreservesOriginalName() throws Exception {
+        // Regression: Supabase Storage rejects S3 keys containing non-ASCII chars (400
+        // Invalid key). Locking in that the storage key never embeds the filename so any
+        // unicode display name still uploads successfully.
+        User owner = new User();
+        owner.setId(99L);
+        String unicodeName = "résumé-日本語-é.pdf";
+        byte[] payload = "u".getBytes(StandardCharsets.UTF_8);
+        MockMultipartFile file =
+                new MockMultipartFile("file", unicodeName, "application/pdf", payload);
+
+        StoredObject stored = provider.store(owner, file);
+
+        assertThat(stored.getStorageKey())
+                .matches(
+                        "99/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}");
+        assertThat(stored.getOriginalFilename()).isEqualTo(unicodeName);
+        try (InputStream in = provider.load(stored.getStorageKey()).getInputStream()) {
+            assertThat(in.readAllBytes()).isEqualTo(payload);
+        }
+    }
+
+    @Test
+    void delete_removesObject() throws Exception {
+        User owner = new User();
+        owner.setId(7L);
+        MockMultipartFile file =
+                new MockMultipartFile(
+                        "file", "todelete.bin", "application/octet-stream", new byte[] {1, 2, 3});
+
+        StoredObject stored = provider.store(owner, file);
+        provider.delete(stored.getStorageKey());
+
+        assertThatThrownBy(() -> provider.load(stored.getStorageKey()))
+                .isInstanceOf(IOException.class);
+    }
+
+    @Test
+    void delete_unknownKey_isNoOp() {
+        assertThat(catchIOException(() -> provider.delete("never-existed"))).isNull();
+    }
+
+    @Test
+    void signedDownloadUrl_returnsWorkingPresignedGet() throws Exception {
+        User owner = new User();
+        owner.setId(99L);
+        byte[] content = "presigned payload".getBytes(StandardCharsets.UTF_8);
+        StoredObject stored =
+                provider.store(
+                        owner, new MockMultipartFile("file", "presign.txt", "text/plain", content));
+
+        Optional<URI> signed =
+                provider.signedDownloadUrl(stored.getStorageKey(), Duration.ofMinutes(2));
+
+        assertThat(signed).isPresent();
+        URI uri = signed.get();
+        assertThat(uri.getScheme()).isIn("http", "https");
+        assertThat(uri.getRawQuery()).contains("X-Amz-Signature");
+
+        HttpURLConnection conn = (HttpURLConnection) new URL(uri.toString()).openConnection();
+        try {
+            assertThat(conn.getResponseCode()).isEqualTo(200);
+            try (InputStream in = conn.getInputStream()) {
+                assertThat(in.readAllBytes()).isEqualTo(content);
+            }
+        } finally {
+            conn.disconnect();
+        }
+    }
+
+    @Test
+    void signedDownloadUrl_nullKey_returnsEmpty() throws Exception {
+        assertThat(provider.signedDownloadUrl(null, Duration.ofMinutes(1))).isEmpty();
+        assertThat(provider.signedDownloadUrl("   ", Duration.ofMinutes(1))).isEmpty();
+    }
+
+    @Test
+    void signedDownloadUrl_nullOrZeroTtl_appliesDefault() throws Exception {
+        User owner = new User();
+        owner.setId(3L);
+        StoredObject stored =
+                provider.store(
+                        owner,
+                        new MockMultipartFile(
+                                "file",
+                                "ttl.txt",
+                                "text/plain",
+                                "x".getBytes(StandardCharsets.UTF_8)));
+
+        assertThat(provider.signedDownloadUrl(stored.getStorageKey(), null)).isPresent();
+        assertThat(provider.signedDownloadUrl(stored.getStorageKey(), Duration.ZERO)).isPresent();
+        assertThat(provider.signedDownloadUrl(stored.getStorageKey(), Duration.ofSeconds(-5)))
+                .isPresent();
+    }
+
+    @Test
+    void signedDownloadUrl_inlineFlagEncodesResponseContentDispositionInQuery() throws Exception {
+        User owner = new User();
+        owner.setId(55L);
+        StoredObject stored =
+                provider.store(
+                        owner,
+                        new MockMultipartFile(
+                                "file",
+                                "stored-name.pdf",
+                                "application/pdf",
+                                "payload".getBytes(StandardCharsets.UTF_8)));
+
+        URI attached =
+                provider.signedDownloadUrl(
+                                stored.getStorageKey(), Duration.ofMinutes(2), false, "report.pdf")
+                        .orElseThrow();
+        String attachedQuery =
+                java.net.URLDecoder.decode(attached.getRawQuery(), StandardCharsets.UTF_8);
+        assertThat(attachedQuery)
+                .contains("response-content-disposition=attachment; filename=\"report.pdf\"");
+
+        URI inline =
+                provider.signedDownloadUrl(
+                                stored.getStorageKey(), Duration.ofMinutes(2), true, "report.pdf")
+                        .orElseThrow();
+        String inlineQuery =
+                java.net.URLDecoder.decode(inline.getRawQuery(), StandardCharsets.UTF_8);
+        assertThat(inlineQuery)
+                .contains("response-content-disposition=inline; filename=\"report.pdf\"");
+
+        URI bare =
+                provider.signedDownloadUrl(
+                                stored.getStorageKey(), Duration.ofMinutes(2), false, null)
+                        .orElseThrow();
+        assertThat(bare.getRawQuery()).doesNotContain("response-content-disposition");
+    }
+
+    @Test
+    void buildContentDisposition_escapesQuotesAndStripsControlChars() {
+        assertThat(S3StorageProvider.buildContentDisposition(true, "ev\"il\r\nname.pdf"))
+                .isEqualTo("inline; filename=\"ev\\\"ilname.pdf\"");
+        assertThat(S3StorageProvider.buildContentDisposition(false, null)).isNull();
+        assertThat(S3StorageProvider.buildContentDisposition(false, "   ")).isNull();
+    }
+
+    private static IOException catchIOException(IOAction action) {
+        try {
+            action.run();
+            return null;
+        } catch (IOException e) {
+            return e;
+        }
+    }
+
+    @FunctionalInterface
+    private interface IOAction {
+        void run() throws IOException;
+    }
+}

app/proprietary/src/test/java/stirling/software/proprietary/storage/service/FolderServiceTest.java

@@ -0,0 +1,298 @@
+package stirling.software.proprietary.storage.service;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.lenient;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.util.Optional;
+import java.util.UUID;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.context.SecurityContext;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.web.server.ResponseStatusException;
+
+import stirling.software.common.model.ApplicationProperties;
+import stirling.software.proprietary.security.model.User;
+import stirling.software.proprietary.storage.model.Folder;
+import stirling.software.proprietary.storage.model.api.CreateFolderRequest;
+import stirling.software.proprietary.storage.repository.FolderRepository;
+import stirling.software.proprietary.storage.repository.StoredFileRepository;
+
+/**
+ * Unit tests for {@link FolderService}. Covers the regressions Connor flagged in PR #6383:
+ *
+ * <ul>
+ *   <li>storage-enabled gate must be enforced (added in the same PR)
+ *   <li>cross-user folder access must 404, not leak existence
+ *   <li>cycle detection on reparent must 400
+ *   <li>depth cap must reject chains past MAX_FOLDER_DEPTH
+ *   <li>per-user folder count cap must 409
+ * </ul>
+ *
+ * Hibernate is mocked: this is a pure-Mockito unit test, not a slice test. Adequate for the
+ * service-layer behaviors above; full DB integration belongs in a separate {@code @DataJpaTest}.
+ */
+@ExtendWith(MockitoExtension.class)
+class FolderServiceTest {
+
+    @Mock private FolderRepository folderRepository;
+    @Mock private StoredFileRepository storedFileRepository;
+    @Mock private ApplicationProperties applicationProperties;
+    @Mock private ApplicationProperties.Security security;
+    @Mock private ApplicationProperties.Storage storage;
+
+    private FolderService service;
+    private User user;
+
+    @BeforeEach
+    void setUp() {
+        // Default to "storage enabled" so the unrelated tests don't have to repeat the wiring.
+        // Individual tests override with disabled state.
+        lenient().when(applicationProperties.getSecurity()).thenReturn(security);
+        lenient().when(applicationProperties.getStorage()).thenReturn(storage);
+        lenient().when(security.isEnableLogin()).thenReturn(true);
+        lenient().when(storage.isEnabled()).thenReturn(true);
+
+        service = new FolderService(folderRepository, storedFileRepository, applicationProperties);
+
+        user = new User();
+        user.setId(42L);
+        user.setUsername("alice");
+        SecurityContext ctx = SecurityContextHolder.createEmptyContext();
+        ctx.setAuthentication(
+                new UsernamePasswordAuthenticationToken(user, null, java.util.List.of()));
+        SecurityContextHolder.setContext(ctx);
+    }
+
+    @AfterEach
+    void tearDown() {
+        SecurityContextHolder.clearContext();
+    }
+
+    @Test
+    void listFolders_rejects_when_login_disabled() {
+        when(security.isEnableLogin()).thenReturn(false);
+        assertThatThrownBy(() -> service.listFolders())
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(403));
+    }
+
+    @Test
+    void listFolders_rejects_when_storage_disabled() {
+        when(storage.isEnabled()).thenReturn(false);
+        assertThatThrownBy(() -> service.listFolders())
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(403));
+    }
+
+    @Test
+    void createFolder_under_unknown_parent_returns_400_without_leaking_existence() {
+        // Parent UUID exists for ANOTHER user; current-user lookup misses it. The repository
+        // returns Optional.empty() and the service must surface a generic 400, not a 404 that
+        // could be used to probe for existence by id-guessing.
+        UUID foreignParentId = UUID.randomUUID();
+        when(folderRepository.findByIdAndOwner(eq(foreignParentId), eq(user)))
+                .thenReturn(Optional.empty());
+
+        CreateFolderRequest req = new CreateFolderRequest();
+        req.setName("Child");
+        req.setParentFolderId(foreignParentId);
+
+        assertThatThrownBy(() -> service.createFolder(req))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e -> {
+                            ResponseStatusException rse = (ResponseStatusException) e;
+                            assertThat(rse.getStatusCode().value()).isEqualTo(400);
+                            assertThat(rse.getReason()).doesNotContain(foreignParentId.toString());
+                        });
+    }
+
+    @Test
+    void createFolder_409_when_user_at_folder_cap() {
+        // Stub out an existing-id miss so we reach the cap check (no Mockito unnecessary-stub
+        // warnings from the OTHER paths because we exit at the cap before the existsById call).
+        UUID newId = UUID.randomUUID();
+        when(folderRepository.findByIdAndOwner(eq(newId), eq(user))).thenReturn(Optional.empty());
+        when(folderRepository.existsById(eq(newId))).thenReturn(false);
+        when(folderRepository.countByOwner(eq(user))).thenReturn(5_000L);
+
+        CreateFolderRequest req = new CreateFolderRequest();
+        req.setName("Overflow");
+        req.setId(newId);
+
+        assertThatThrownBy(() -> service.createFolder(req))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(409));
+    }
+
+    @Test
+    void resolveParent_rejects_when_chain_exceeds_depth_cap() {
+        // Build a chain Hibernate-proxy-style: 64 ancestor stubs reachable via getParent(). The
+        // 65th createFolder attempt under the deepest existing folder should be rejected with
+        // 400 before any further work.
+        Folder root = makeFolder(UUID.randomUUID(), null);
+        Folder cursor = root;
+        for (int i = 0; i < 63; i++) {
+            Folder child = makeFolder(UUID.randomUUID(), cursor);
+            cursor = child;
+        }
+        // cursor is at depth 64 from root. Attempting to add another folder under cursor pushes
+        // the new child to depth 65 - past the cap. resolveParent walks cursor->root counting
+        // ancestors, which is exactly 64, and rejects.
+        Folder deepest = cursor;
+        when(folderRepository.findByIdAndOwner(eq(deepest.getId()), eq(user)))
+                .thenReturn(Optional.of(deepest));
+
+        CreateFolderRequest req = new CreateFolderRequest();
+        req.setName("Too deep");
+        req.setParentFolderId(deepest.getId());
+
+        assertThatThrownBy(() -> service.createFolder(req))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e -> {
+                            ResponseStatusException rse = (ResponseStatusException) e;
+                            assertThat(rse.getStatusCode().value()).isEqualTo(400);
+                            assertThat(rse.getReason()).containsIgnoringCase("nesting limit");
+                        });
+    }
+
+    @Test
+    void updateFolder_rejects_cycle_on_reparent() {
+        // A -> B -> C. Attempt to reparent A under C (i.e. set A.parent = C). C's chain to root
+        // includes B which includes A, so the cycle check must fire with 400.
+        Folder a = makeFolder(UUID.randomUUID(), null);
+        Folder b = makeFolder(UUID.randomUUID(), a);
+        Folder c = makeFolder(UUID.randomUUID(), b);
+
+        when(folderRepository.findByIdAndOwner(eq(a.getId()), eq(user))).thenReturn(Optional.of(a));
+        when(folderRepository.findByIdAndOwner(eq(c.getId()), eq(user))).thenReturn(Optional.of(c));
+
+        stirling.software.proprietary.storage.model.api.UpdateFolderRequest req =
+                new stirling.software.proprietary.storage.model.api.UpdateFolderRequest();
+        req.setParentFolderId(c.getId());
+        // shouldReparent() requires the explicit reparent flag - without it the
+        // parent change is silently skipped (PATCH-style semantics).
+        req.setReparent(true);
+
+        assertThatThrownBy(() -> service.updateFolder(a.getId(), req))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e -> {
+                            ResponseStatusException rse = (ResponseStatusException) e;
+                            assertThat(rse.getStatusCode().value()).isEqualTo(400);
+                            assertThat(rse.getReason()).containsIgnoringCase("descendants");
+                        });
+    }
+
+    @Test
+    void updateFolder_rejects_when_folder_not_owned() {
+        // Owner mismatch surfaces as 404, NOT 403 - 403 would confirm the folder exists, leaking
+        // ids to probing users. Stays consistent with the createFolder-under-unknown-parent test
+        // above.
+        UUID foreignId = UUID.randomUUID();
+        when(folderRepository.findByIdAndOwner(eq(foreignId), eq(user)))
+                .thenReturn(Optional.empty());
+
+        stirling.software.proprietary.storage.model.api.UpdateFolderRequest req =
+                new stirling.software.proprietary.storage.model.api.UpdateFolderRequest();
+        req.setName("Renamed");
+
+        assertThatThrownBy(() -> service.updateFolder(foreignId, req))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(404));
+    }
+
+    @Test
+    void moveFileToFolder_rejects_when_target_folder_not_owned() {
+        // File belongs to current user but target folder belongs to someone else. Service must
+        // 400, not move the file.
+        UUID foreignFolderId = UUID.randomUUID();
+        stirling.software.proprietary.storage.model.StoredFile file =
+                mock(stirling.software.proprietary.storage.model.StoredFile.class);
+        when(storedFileRepository.findByIdAndOwner(eq(100L), eq(user)))
+                .thenReturn(Optional.of(file));
+        when(folderRepository.findByIdAndOwner(eq(foreignFolderId), eq(user)))
+                .thenReturn(Optional.empty());
+
+        assertThatThrownBy(() -> service.moveFileToFolder(100L, foreignFolderId))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(400));
+    }
+
+    @Test
+    void bulkMove_rejects_oversized_payload() {
+        // Bypass the @Valid bound by calling the service directly - the cap must hold here too,
+        // not just at the controller's request validator.
+        java.util.List<Long> tooMany = new java.util.ArrayList<>();
+        for (int i = 0; i < 1001; i++) tooMany.add((long) i);
+
+        assertThatThrownBy(() -> service.bulkMoveFilesToFolder(null, tooMany))
+                .isInstanceOf(ResponseStatusException.class)
+                .satisfies(
+                        e ->
+                                assertThat(((ResponseStatusException) e).getStatusCode().value())
+                                        .isEqualTo(400));
+    }
+
+    @Test
+    void bulkMove_returns_moved_and_skipped_split() {
+        // Ownership filter on the repository returns a subset; the rest land in skippedFileIds.
+        Folder target = makeFolder(UUID.randomUUID(), null);
+        when(folderRepository.findByIdAndOwner(eq(target.getId()), eq(user)))
+                .thenReturn(Optional.of(target));
+
+        stirling.software.proprietary.storage.model.StoredFile fileA =
+                mock(stirling.software.proprietary.storage.model.StoredFile.class);
+        when(fileA.getId()).thenReturn(1L);
+        stirling.software.proprietary.storage.model.StoredFile fileB =
+                mock(stirling.software.proprietary.storage.model.StoredFile.class);
+        when(fileB.getId()).thenReturn(2L);
+        when(storedFileRepository.findAllByIdInAndOwner(any(), eq(user)))
+                .thenReturn(java.util.List.of(fileA, fileB));
+
+        FolderService.BulkMoveResult result =
+                service.bulkMoveFilesToFolder(target.getId(), java.util.List.of(1L, 2L, 3L, 4L));
+
+        assertThat(result.movedFileIds()).containsExactly(1L, 2L);
+        assertThat(result.skippedFileIds()).containsExactly(3L, 4L);
+    }
+
+    // ─── helpers ────────────────────────────────────────────────────────────────
+
+    private Folder makeFolder(UUID id, Folder parent) {
+        Folder f = new Folder();
+        f.setId(id);
+        f.setOwner(user);
+        f.setName("f-" + id.toString().substring(0, 8));
+        f.setParent(parent);
+        return f;
+    }
+}

app/proprietary/src/test/resources/db-migration-fixtures/README.md

@@ -0,0 +1,110 @@
+# DB migration test fixtures
+
+These `.mv.db` files are H2 databases captured from past Stirling-PDF releases.
+They feed the CI smoke test that verifies a fresh build can still boot and
+authenticate against a database created by an older version.
+
+| File | Source release | Tables | Notes |
+|---|---|---|---|
+| `stirling-pdf-v2.0.0.mv.db` | [v2.0.0](https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.0.0) | users, authorities, teams, sessions, audit_events, persistent_logins, invite_tokens, user_license_settings, user_settings | Pre-storage/workflow schema. |
+| `stirling-pdf-v2.5.0.mv.db` | [v2.5.0](https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.5.0) | same as v2.0.0 | Schema unchanged from v2.0.0; intentionally kept as a separate fixture to exercise the "skip every other minor" upgrade path. |
+| `stirling-pdf-v2.10.0.mv.db` | [v2.10.0](https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.10.0) | v2.5.0 tables + file_shares, file_share_accesses, stored_files, stored_file_blobs, storage_cleanup_entries, user_server_certificates, workflow_sessions, workflow_participants, participant_notifications | Adds the file-sharing and workflow signing schema. |
+
+All three were generated against H2 `2.3.232` and use the same on-disk file
+format, so the runtime driver can open any of them without conversion.
+
+## What's in each fixture
+
+* `admin` user with the default password `stirling` (BCrypt `$2a$10$...`).
+* The internal API user `STIRLING-PDF-BACKEND-API-USER`.
+* `ROLE_ADMIN` authority row for the admin user.
+* `Default` and `Internal` teams.
+* `user_license_settings` row (singleton).
+
+`audit_events`, `sessions`, and `user_settings` are empty in the OSS-flavored
+fixtures: those tables are written only on Enterprise builds (audit) or
+require an HTTP-session-creating flow (sessions / settings) that the OSS form
+login no longer exposes. The migration test only depends on the admin user
+existing, so leaving these empty is intentional.
+
+## What the CI test checks
+
+`.github/workflows/db-migration-test.yml` runs `scripts/db-migration/run-migration-test.sh`,
+which for each fixture:
+
+1. Copies the fixture into `configs/stirling-pdf-DB-2.3.232.mv.db` of a clean
+   working directory.
+2. Boots the current `:stirling-pdf:bootJar` against it on a free port.
+3. Waits for Spring to start (no `SchemaManagementException` in the log).
+4. POSTs `{"username":"admin","password":"stirling"}` to `/api/v1/auth/login`
+   and asserts the response is `200 OK`.
+
+A red CI on this job means a schema change in the PR is not backwards
+compatible with an existing user database. Common causes:
+
+* Adding a non-nullable column without a default.
+* Renaming a column (Hibernate's `update` strategy adds the new column and
+  leaves the old one orphaned with the data still in it).
+* Changing a column type in an incompatible way.
+* Dropping or renaming a foreign-key target.
+
+## Regenerating fixtures
+
+There's no automated regenerator script - fixtures are rare to refresh and the
+manual steps are short. For each version you want to capture:
+
+```bash
+# 1. Download the JAR for that release (requires `gh` authenticated against
+#    github.com/Stirling-Tools/Stirling-PDF).
+gh release download v2.10.0 \
+  --repo Stirling-Tools/Stirling-PDF \
+  --pattern 'Stirling-PDF-with-login.jar' \
+  --output /tmp/stirling-v2.10.0.jar
+
+# 2. Boot the JAR in a clean working directory. DB_CLOSE_ON_EXIT=TRUE is
+#    the only override that matters - it makes the H2 file flush on JVM exit
+#    even if you Ctrl-C instead of going through a graceful shutdown.
+workdir=$(mktemp -d)
+mkdir -p "$workdir/configs"
+cd "$workdir"
+java -jar /tmp/stirling-v2.10.0.jar \
+  --server.port=8089 \
+  --spring.datasource.url='jdbc:h2:file:./configs/stirling-pdf-DB-2.3.232;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=TRUE;MODE=PostgreSQL' \
+  &
+
+# 3. Wait until http://localhost:8089/login responds, then log in once to
+#    materialize whatever rows the app writes on first boot.
+curl -sf -X POST -H 'Content-Type: application/json' \
+  -d '{"username":"admin","password":"stirling"}' \
+  http://localhost:8089/api/v1/auth/login
+
+# 4. Shut it down (any kill works - DB_CLOSE_ON_EXIT=TRUE handles the flush).
+kill -TERM %1 && wait %1
+
+# 5. Copy the .mv.db here, renamed for the version.
+cp "$workdir/configs/stirling-pdf-DB-2.3.232.mv.db" \
+   app/proprietary/src/test/resources/db-migration-fixtures/stirling-pdf-v2.10.0.mv.db
+```
+
+Requirements: Java 21+ (the historical JARs target Java 17 / 21).
+
+## Adding a new fixture
+
+When a new minor release ships, repeat the steps above for the new tag and
+add a row to the table at the top of this file. Keep the historical fixtures -
+the test gets stronger with each schema generation it covers.
+
+## Inspecting a fixture by hand
+
+The H2 driver bundled with the build ships an interactive shell:
+
+```bash
+h2_jar=$(find ~/.gradle/caches/modules-2 -name 'h2-2.3.232.jar' | head -1)
+cd app/proprietary/src/test/resources/db-migration-fixtures
+java -cp "$h2_jar" org.h2.tools.Shell \
+  -url 'jdbc:h2:file:./stirling-pdf-v2.10.0;ACCESS_MODE_DATA=r;MODE=PostgreSQL' \
+  -user sa
+```
+
+`ACCESS_MODE_DATA=r` keeps the inspection read-only so you can't accidentally
+mutate a committed fixture.

app/saas/src/main/java/stirling/software/saas/config/SaasJpaConfig.java

@@ -5,18 +5,24 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 
-/** Registers the {@code :saas} module's entities and repositories with Spring Data JPA. */
+/**
+ * Registers the {@code :saas} module's entities and repositories with Spring Data JPA. Any new
+ * package holding {@code @Repository} or {@code @Entity} classes must be added here, or the beans
+ * won't wire at startup.
+ */
 @Configuration
 @Profile("saas")
 @EnableJpaRepositories(
         basePackages = {
             "stirling.software.saas.repository",
             "stirling.software.saas.billing.repository",
-            "stirling.software.saas.ai.repository"
+            "stirling.software.saas.ai.repository",
+            "stirling.software.saas.payg.repository"
         })
 @EntityScan({
     "stirling.software.saas.model",
     "stirling.software.saas.billing.model",
-    "stirling.software.saas.ai.model"
+    "stirling.software.saas.ai.model",
+    "stirling.software.saas.payg"
 })
 public class SaasJpaConfig {}

app/saas/src/main/java/stirling/software/saas/model/TeamMembership.java

@@ -73,6 +73,13 @@ public class TeamMembership implements Serializable {
     @Column(name = "updated_at", nullable = false)
     private LocalDateTime updatedAt;
 
+    /**
+     * Optional per-member spend cap inside the team's wallet, in doc units. NULL means the member
+     * is bounded only by the team-wide cap.
+     */
+    @Column(name = "cap_units")
+    private Long capUnits;
+
     public boolean isLeader() {
         return role == TeamRole.LEADER;
     }

app/saas/src/main/java/stirling/software/saas/payg/docs/DefaultDocumentClassifier.java

@@ -0,0 +1,173 @@
+package stirling.software.saas.payg.docs;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.util.List;
+import java.util.Objects;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+import org.springframework.web.multipart.MultipartFile;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+
+import stirling.software.common.util.TempFile;
+import stirling.software.common.util.TempFileManager;
+import stirling.software.jpdfium.PdfDocument;
+import stirling.software.saas.payg.policy.PricingPolicy;
+
+/**
+ * Reads pages via jpdfium for PDF inputs; treats every other content type as bytes-only.
+ *
+ * <p>For PDFs, units are the larger of {@code ceil(pages / docPagesPerUnit)} and {@code ceil(bytes
+ * / docBytesPerUnit)}. For non-PDFs, only the bytes axis contributes. A single file is clamped to
+ * {@code [1, policy.fileUnitCap]}; a multi-file group is clamped to {@code [1, policy.fileUnitCap *
+ * file_count]} applied to the sum of raw per-file units. Malformed/encrypted PDFs fall back to
+ * bytes-only.
+ *
+ * <p>{@code policy.minChargeUnits} is applied by the charge service, not here. The classifier only
+ * enforces an absolute floor of {@link #MIN_UNITS_PER_NONEMPTY_FILE} so callers can rely on
+ * "non-empty input → at least 1 unit".
+ */
+@Slf4j
+@Component
+@Profile("saas")
+@RequiredArgsConstructor
+public class DefaultDocumentClassifier implements DocumentClassifier {
+
+    private static final String PDF_CONTENT_TYPE = "application/pdf";
+    private static final String DEFAULT_CONTENT_TYPE = "application/octet-stream";
+
+    /** Floor for non-empty input. Distinct from {@code policy.minChargeUnits} (applied later). */
+    private static final int MIN_UNITS_PER_NONEMPTY_FILE = 1;
+
+    private final TempFileManager tempFileManager;
+
+    @Override
+    public DocumentMetrics classify(MultipartFile file, PricingPolicy policy) {
+        Objects.requireNonNull(file, "file");
+        Objects.requireNonNull(policy, "policy");
+
+        FileFacts facts = inspect(file);
+        long rawUnits = computeRawUnits(facts.pages, facts.bytes, policy);
+        // toIntExact: fail loud on overflow rather than silently wrapping a billing number.
+        int units =
+                Math.toIntExact(
+                        Math.max(
+                                MIN_UNITS_PER_NONEMPTY_FILE,
+                                Math.min(policy.getFileUnitCap(), rawUnits)));
+        return new DocumentMetrics(facts.pages, facts.bytes, facts.contentType, units);
+    }
+
+    @Override
+    public DocumentMetrics classify(List<MultipartFile> files, PricingPolicy policy) {
+        Objects.requireNonNull(files, "files");
+        Objects.requireNonNull(policy, "policy");
+        if (files.isEmpty()) {
+            throw new IllegalArgumentException("files must not be empty");
+        }
+
+        int totalPages = 0;
+        long totalBytes = 0;
+        long rawUnitsSum = 0;
+        String firstContentType = null;
+
+        for (MultipartFile file : files) {
+            FileFacts facts = inspect(file);
+            // Sum the *raw* (unclamped) per-file units so the group cap below can actually bind.
+            // Per-file clamping in this loop would make the group cap a no-op.
+            rawUnitsSum =
+                    saturatedAdd(rawUnitsSum, computeRawUnits(facts.pages, facts.bytes, policy));
+            totalPages = saturatedAdd(totalPages, facts.pages);
+            totalBytes = saturatedAdd(totalBytes, facts.bytes);
+            if (firstContentType == null) {
+                firstContentType = facts.contentType;
+            }
+        }
+
+        long groupCap = (long) policy.getFileUnitCap() * files.size();
+        // toIntExact: fail loud on overflow rather than silently wrapping.
+        int totalUnits =
+                Math.toIntExact(
+                        Math.max(
+                                (long) MIN_UNITS_PER_NONEMPTY_FILE,
+                                Math.min(groupCap, rawUnitsSum)));
+
+        return new DocumentMetrics(
+                totalPages,
+                totalBytes,
+                firstContentType != null ? firstContentType : DEFAULT_CONTENT_TYPE,
+                totalUnits);
+    }
+
+    private FileFacts inspect(MultipartFile file) {
+        long bytes = file.getSize();
+        String contentType =
+                file.getContentType() != null ? file.getContentType() : DEFAULT_CONTENT_TYPE;
+        int pages = isPdf(contentType, file.getOriginalFilename()) ? readPageCount(file) : 0;
+        return new FileFacts(pages, bytes, contentType);
+    }
+
+    private static long computeRawUnits(int pages, long bytes, PricingPolicy policy) {
+        long pageUnits = pages > 0 ? ceilDiv(pages, policy.getDocPagesPerUnit()) : 0L;
+        long byteUnits = ceilDiv(bytes, policy.getDocBytesPerUnit());
+        return Math.max(pageUnits, byteUnits);
+    }
+
+    private static long ceilDiv(long numerator, long divisor) {
+        if (numerator <= 0) {
+            return 0;
+        }
+        return (numerator + divisor - 1) / divisor;
+    }
+
+    private static boolean isPdf(String contentType, String filename) {
+        if (PDF_CONTENT_TYPE.equalsIgnoreCase(contentType)) {
+            return true;
+        }
+        return filename != null && filename.toLowerCase().endsWith(".pdf");
+    }
+
+    /**
+     * Materialises the upload to a managed temp file and asks jpdfium for the page count. Returns 0
+     * if the file can't be parsed — the byte-derived axis still produces a charge.
+     */
+    private int readPageCount(MultipartFile file) {
+        try (TempFile temp = tempFileManager.createManagedTempFile(".pdf")) {
+            try (InputStream in = file.getInputStream();
+                    OutputStream out = Files.newOutputStream(temp.getPath())) {
+                in.transferTo(out);
+            }
+            try (PdfDocument doc = PdfDocument.open(temp.getPath())) {
+                return doc.pageCount();
+            }
+        } catch (IOException | RuntimeException e) {
+            log.debug(
+                    "Could not read PDF page count for {} ({}); falling back to bytes-only units",
+                    file.getOriginalFilename(),
+                    e.getClass().getSimpleName());
+            return 0;
+        }
+    }
+
+    private static int saturatedAdd(int a, int b) {
+        long sum = (long) a + b;
+        if (sum > Integer.MAX_VALUE) {
+            return Integer.MAX_VALUE;
+        }
+        return (int) sum;
+    }
+
+    private static long saturatedAdd(long a, long b) {
+        try {
+            return Math.addExact(a, b);
+        } catch (ArithmeticException e) {
+            return Long.MAX_VALUE;
+        }
+    }
+
+    private record FileFacts(int pages, long bytes, String contentType) {}
+}

app/saas/src/main/java/stirling/software/saas/payg/docs/DocumentClassifier.java

@@ -0,0 +1,25 @@
+package stirling.software.saas.payg.docs;
+
+import java.util.List;
+
+import org.springframework.web.multipart.MultipartFile;
+
+import stirling.software.saas.payg.policy.PricingPolicy;
+
+/**
+ * Computes the doc-unit cost of an uploaded file (or multi-file input) under a given policy.
+ *
+ * <p>Returns {@code docUnits} with an absolute floor of 1 for non-empty input. {@code
+ * policy.minChargeUnits} is applied at charge time, not here.
+ */
+public interface DocumentClassifier {
+
+    /** Classify a single uploaded file. Returns at least 1 unit, capped at {@code fileUnitCap}. */
+    DocumentMetrics classify(MultipartFile file, PricingPolicy policy);
+
+    /**
+     * Classify a multi-file input (e.g. a merge or overlay). Returns the sum of each file's raw
+     * units, capped at {@code fileUnitCap × files.size()} and floored at 1.
+     */
+    DocumentMetrics classify(List<MultipartFile> files, PricingPolicy policy);
+}

app/saas/src/main/java/stirling/software/saas/payg/docs/DocumentMetrics.java

@@ -0,0 +1,12 @@
+package stirling.software.saas.payg.docs;
+
+/**
+ * Output of {@link DocumentClassifier#classify}. {@code pages} is {@code 0} for non-PDF inputs.
+ *
+ * @param pages page count (0 for non-PDFs and for files whose page count couldn't be read)
+ * @param bytes raw byte length of the file
+ * @param contentType MIME type as reported by the upload, or {@code "application/octet-stream"}
+ *     when unknown
+ * @param docUnits computed unit cost, clamped to the policy's {@code fileUnitCap}
+ */
+public record DocumentMetrics(int pages, long bytes, String contentType, int docUnits) {}