OwnCord/docs/schema.md

Database Schema Reference

OwnCord uses a single SQLite database file (data/chatserver.db) with the pure-Go driver modernc.org/sqlite (no CGO). Migrations run automatically on startup.

Data-access layers: queries currently run as hand-written SQL in Server/db; an sqlc-generated layer (Server/db/dbgen, from Server/db/queries/) exists and is slated to become the real query layer per decision D2 in plans/audit-2026-07-19-decisions.md. See architecture/data-model.md for the full picture.

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Database Configuration

PRAGMA	Value	Purpose
journal_mode	WAL	Write-Ahead Logging for concurrent readers
foreign_keys	ON	Enforces all REFERENCES constraints
busy_timeout	5000	Waits up to 5 seconds for the write lock
synchronous	NORMAL	Safe with WAL mode, reduces fsync calls
temp_store	MEMORY	Temporary tables stored in RAM
mmap_size	268435456	256 MB memory-mapped I/O
cache_size	-64000	64 MB page cache

SQLite only allows one writer at a time. The connection pool is pinned to a single connection.

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Migration System

Migrations are embedded .sql files applied in lexicographic order. Each migration runs in a transaction and is tracked in schema_versions.

CREATE TABLE IF NOT EXISTS schema_versions (
    version    TEXT PRIMARY KEY,
    applied_at TEXT NOT NULL DEFAULT (datetime('now'))
);

Migration History

File	Description
001_initial_schema.sql	All core tables, default roles and settings
002_voice_states.sql	Adds voice_states table
003_audit_log.sql	Recreates audit_log with canonical column names (via a transient audit_log_v6 rename)
004_voice_optimization.sql	Adds camera, screenshare to voice_states; voice settings to channels
005_fix_member_permissions.sql	Fixes Member role permissions
006_channel_overrides_index.sql	Adds composite index on channel_overrides
007_member_video_permissions.sql	Adds USE_VIDEO and SHARE_SCREEN to Member role
008_attachment_dimensions.sql	Adds width and height to attachments
009_dm_tables.sql	Adds dm_participants and dm_open_state tables
010_attachment_uploader.sql	Adds attachments.uploader_id + index for upload-ownership checks
011_rate_lockouts.sql	Adds rate_lockouts so rate-limit lockouts survive restarts
012_user_blocks.sql	Adds user_blocks (blocks DM creation/messaging between users)
013_channel_type_constraint.sql	INSERT/UPDATE triggers restricting channels.type to text/voice/dm
014_events_table.sql	Adds events — persistent broadcast log for reconnect cold-tier replay
015_plugins.sql	Adds plugins and plugin_kv for the WASM plugin runtime
016_announcement_channel_type.sql	Recreates the channel-type triggers to allow announcement
017_user_identity_key.sql	Adds users.identity_public_key (long-term E2EE identity key for voice TOFU)

---

Tables

roles

Defines permission tiers.

CREATE TABLE roles (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    name        TEXT    NOT NULL UNIQUE,
    color       TEXT,
    permissions INTEGER NOT NULL DEFAULT 0,
    position    INTEGER NOT NULL DEFAULT 0,
    is_default  INTEGER NOT NULL DEFAULT 0
);

Default roles:

id	name	color	permissions	position	Notes
1	Owner	#E74C3C	0x7FFFFFFF	100	All 31 permission bits set
2	Admin	#F39C12	0x3FFFFFFF	80	Everything except ADMINISTRATOR
3	Moderator	#3498DB	0x000FFFFF	60	All message + voice + moderation
4	Member	NULL	0x1E63	40	Send, read, attach, react, voice, video, screen share

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users

CREATE TABLE users (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    username    TEXT    NOT NULL UNIQUE COLLATE NOCASE,
    password    TEXT    NOT NULL,
    avatar      TEXT,
    role_id     INTEGER NOT NULL DEFAULT 4 REFERENCES roles(id),
    totp_secret TEXT,
    status      TEXT    NOT NULL DEFAULT 'offline',
    created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
    last_seen   TEXT,
    banned      INTEGER NOT NULL DEFAULT 0,
    ban_reason  TEXT,
    ban_expires TEXT,
    identity_public_key TEXT
);

Valid status values: online, idle, dnd, offline. All statuses are reset to offline on server startup.

identity_public_key (added in migration 017) is the user's long-term E2EE identity public key (base64 ECDSA P-256) used for TOFU pinning of voice E2EE announces; NULL = not published (legacy client).

---

sessions

CREATE TABLE sessions (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id    INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token      TEXT    NOT NULL UNIQUE,
    device     TEXT,
    ip_address TEXT,
    created_at TEXT    NOT NULL DEFAULT (datetime('now')),
    last_used  TEXT    NOT NULL DEFAULT (datetime('now')),
    expires_at TEXT    NOT NULL
);

Session TTL: 30 days. Token is stored as SHA-256 hash.

---

channels

CREATE TABLE channels (
    id               INTEGER PRIMARY KEY AUTOINCREMENT,
    name             TEXT    NOT NULL,
    type             TEXT    NOT NULL DEFAULT 'text',
    category         TEXT,
    topic            TEXT,
    position         INTEGER NOT NULL DEFAULT 0,
    slow_mode        INTEGER NOT NULL DEFAULT 0,
    archived         INTEGER NOT NULL DEFAULT 0,
    created_at       TEXT    NOT NULL DEFAULT (datetime('now')),
    voice_max_users  INTEGER NOT NULL DEFAULT 0,
    voice_quality    TEXT,
    mixing_threshold INTEGER,
    voice_max_video  INTEGER NOT NULL DEFAULT 25
);

Channel types: text, voice, announcement, dm. Migration 013 installs INSERT/UPDATE triggers restricting the value to this set (migration 016 added announcement). Announcement channels are readable like text channels but posting is restricted to users with MANAGE_MESSAGES (enforced in the service layer, Server/service/message.go).

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channel_overrides

Per-channel permission overrides for specific roles.

CREATE TABLE channel_overrides (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    role_id    INTEGER NOT NULL REFERENCES roles(id) ON DELETE CASCADE,
    allow      INTEGER NOT NULL DEFAULT 0,
    deny       INTEGER NOT NULL DEFAULT 0,
    UNIQUE(channel_id, role_id)
);

Effective permission calculation: effective = (base_permissions & ~deny) | allow

---

messages

CREATE TABLE messages (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    user_id    INTEGER NOT NULL REFERENCES users(id),
    content    TEXT    NOT NULL,
    reply_to   INTEGER REFERENCES messages(id) ON DELETE SET NULL,
    edited_at  TEXT,
    deleted    INTEGER NOT NULL DEFAULT 0,
    pinned     INTEGER NOT NULL DEFAULT 0,
    timestamp  TEXT    NOT NULL DEFAULT (datetime('now'))
);

Messages are soft-deleted (deleted = 1), never physically removed by user action.

---

messages_fts (FTS5 Virtual Table)

Full-text search index synchronized via triggers.

CREATE VIRTUAL TABLE messages_fts USING fts5(
    content,
    content='messages',
    content_rowid='id'
);

Supports FTS5 query syntax: simple terms, phrase queries, prefix queries, boolean operators (AND, OR, NOT).

---

attachments

CREATE TABLE attachments (
    id          TEXT    PRIMARY KEY,
    message_id  INTEGER REFERENCES messages(id) ON DELETE CASCADE,
    filename    TEXT    NOT NULL,
    stored_as   TEXT    NOT NULL,
    mime_type   TEXT    NOT NULL,
    size        INTEGER NOT NULL,
    uploaded_at TEXT    NOT NULL DEFAULT (datetime('now')),
    width       INTEGER,
    height      INTEGER,
    uploader_id INTEGER REFERENCES users(id)
);

Uses UUID primary keys. message_id is NULL during upload, linked when the message is sent. uploader_id (added by migration 010) records who uploaded the file and backs the ownership check when attaching an upload to a message.

---

reactions

CREATE TABLE reactions (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    message_id INTEGER NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
    user_id    INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    emoji      TEXT    NOT NULL,
    UNIQUE(message_id, user_id, emoji)
);

---

invites

CREATE TABLE invites (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    code        TEXT    NOT NULL UNIQUE,
    created_by  INTEGER NOT NULL REFERENCES users(id),
    redeemed_by INTEGER REFERENCES users(id),
    max_uses    INTEGER,
    use_count   INTEGER NOT NULL DEFAULT 0,
    expires_at  TEXT,
    created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
    revoked     INTEGER NOT NULL DEFAULT 0
);

Invite codes are 8 random bytes encoded as hex. Uses are validated and incremented atomically.

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read_states

CREATE TABLE read_states (
    user_id         INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    channel_id      INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    last_message_id INTEGER NOT NULL DEFAULT 0,
    mention_count   INTEGER NOT NULL DEFAULT 0,
    PRIMARY KEY (user_id, channel_id)
);

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audit_log

CREATE TABLE audit_log (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    actor_id    INTEGER NOT NULL DEFAULT 0,
    action      TEXT    NOT NULL,
    target_type TEXT    NOT NULL DEFAULT '',
    target_id   INTEGER NOT NULL DEFAULT 0,
    detail      TEXT    NOT NULL DEFAULT '',
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

---

voice_states

Ephemeral -- all rows deleted on server startup.

CREATE TABLE voice_states (
    user_id     INTEGER PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
    channel_id  INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    muted       INTEGER NOT NULL DEFAULT 0,
    deafened    INTEGER NOT NULL DEFAULT 0,
    speaking    INTEGER NOT NULL DEFAULT 0,
    camera      INTEGER NOT NULL DEFAULT 0,
    screenshare INTEGER NOT NULL DEFAULT 0,
    joined_at   TEXT    NOT NULL DEFAULT (datetime('now'))
);

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dm_participants

CREATE TABLE dm_participants (
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    user_id    INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    PRIMARY KEY (channel_id, user_id)
);

---

dm_open_state

CREATE TABLE dm_open_state (
    user_id    INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
    opened_at  TEXT    NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (user_id, channel_id)
);

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login_attempts

Login attempt log used for IP-based rate limiting and lockouts.

CREATE TABLE login_attempts (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    ip_address TEXT    NOT NULL,
    username   TEXT,
    success    INTEGER NOT NULL DEFAULT 0,
    timestamp  TEXT    NOT NULL DEFAULT (datetime('now'))
);

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settings

Generic key/value store for server settings (server_name, motd, registration_open, …). Written by the admin API; read by the REST layer and the WebSocket hub (cached with a short TTL).

CREATE TABLE settings (
    key   TEXT PRIMARY KEY,
    value TEXT NOT NULL
);

---

emoji

Custom emoji metadata.

CREATE TABLE emoji (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    shortcode   TEXT    NOT NULL UNIQUE,
    filename    TEXT    NOT NULL,
    uploaded_by INTEGER NOT NULL REFERENCES users(id),
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

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sounds

Dead schema. Created by the initial schema for the soundboard feature, which has since been removed; the table remains but nothing reads or writes it. Slated for a cleanup migration (audit A-2026-07-13).

CREATE TABLE sounds (
    id          INTEGER PRIMARY KEY AUTOINCREMENT,
    name        TEXT    NOT NULL,
    filename    TEXT    NOT NULL,
    duration_ms INTEGER NOT NULL,
    uploaded_by INTEGER NOT NULL REFERENCES users(id),
    created_at  TEXT    NOT NULL DEFAULT (datetime('now'))
);

---

rate_lockouts

Persists rate-limiter lockouts (e.g. repeated failed logins) so they survive server restarts. Sliding-window counters themselves stay in memory.

CREATE TABLE rate_lockouts (
    key        TEXT    PRIMARY KEY,
    expires_at TEXT    NOT NULL
);

---

user_blocks

User blocking (added by migration 012): a block prevents DM creation and messaging between the two users.

CREATE TABLE user_blocks (
    blocker_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    blocked_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at TEXT    NOT NULL DEFAULT (datetime('now')),
    PRIMARY KEY (blocker_id, blocked_id),
    CHECK (blocker_id != blocked_id)
);

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events

Persistent broadcast log (migration 014) — the cold tier of the reconnect replay pipeline (see protocol.md). Written asynchronously by the event persister, pruned by retention (configurable, default 24h). The hub's in-memory sequence counter is seeded from MAX(events.seq) at startup so sequence numbers stay monotonic across restarts.

CREATE TABLE events (
    seq        INTEGER PRIMARY KEY AUTOINCREMENT,
    event_type TEXT    NOT NULL,
    payload    BLOB    NOT NULL,
    channel_id INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

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plugins / plugin_kv

Plugin registry and per-plugin key/value storage (migration 015). plugin_kv is namespaced per plugin via the composite primary key.

CREATE TABLE plugins (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    name          TEXT    NOT NULL UNIQUE,
    version       TEXT    NOT NULL,
    enabled       INTEGER NOT NULL DEFAULT 0,
    manifest_json TEXT    NOT NULL,
    installed_at  TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE plugin_kv (
    plugin_id INTEGER NOT NULL REFERENCES plugins(id) ON DELETE CASCADE,
    key       TEXT    NOT NULL,
    value     BLOB    NOT NULL,
    PRIMARY KEY (plugin_id, key)
);

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Indexes

Index Name	Table	Columns	Purpose
idx_sessions_token	sessions	(token)	Fast session lookup by token hash
idx_sessions_user	sessions	(user_id)	Fast deletion of all sessions for a user
idx_messages_channel	messages	(channel_id, id DESC)	Latest messages in channel query
idx_messages_user	messages	(user_id)	Filter by author
idx_invites_code	invites	(code)	Fast invite validation
idx_audit_timestamp	audit_log	(created_at DESC)	Pagination of audit log
idx_audit_log_actor	audit_log	(actor_id)	Filter by actor
idx_login_ip	login_attempts	(ip_address, timestamp)	Rate limiting queries
idx_voice_states_channel	voice_states	(channel_id)	All users in a voice channel
idx_channel_overrides_channel_role	channel_overrides	(channel_id, role_id)	Permission lookup
idx_dm_participants_user	dm_participants	(user_id)	DM channel lookup
idx_attachments_uploader	attachments	(uploader_id)	Upload-ownership checks
idx_user_blocks_blocked	user_blocks	(blocked_id, blocker_id)	Reverse block lookup
idx_events_channel_seq	events	(channel_id, seq)	Cold-tier replay per channel
idx_events_created_at	events	(created_at)	Retention pruning

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Permission Bitfield System

Permissions are stored as an integer bitfield (31 bits used) in roles.permissions, channel_overrides.allow, and channel_overrides.deny.

Bit Map

Bit	Hex	Name	Description
0	0x1	SEND_MESSAGES	Post messages in text channels
1	0x2	READ_MESSAGES	View messages in text channels
5	0x20	ATTACH_FILES	Upload file attachments
6	0x40	ADD_REACTIONS	Add emoji reactions
9	0x200	CONNECT_VOICE	Join voice channels
10	0x400	SPEAK_VOICE	Transmit audio in voice channels
11	0x800	USE_VIDEO	Enable camera in voice channels
12	0x1000	SHARE_SCREEN	Share screen in voice channels
16	0x10000	MANAGE_MESSAGES	Delete others' messages, pin/unpin
17	0x20000	MANAGE_CHANNELS	Create, edit, delete channels
18	0x40000	KICK_MEMBERS	Kick users
19	0x80000	BAN_MEMBERS	Ban/unban users
20	0x100000	MUTE_MEMBERS	Server-side mute/deafen in voice
24	0x1000000	MANAGE_ROLES	Create, edit, delete roles
25	0x2000000	MANAGE_SERVER	Modify server settings
26	0x4000000	MANAGE_INVITES	Create and revoke invite codes
27	0x8000000	VIEW_AUDIT_LOG	View the audit log
30	0x40000000	ADMINISTRATOR	Bypasses ALL permission checks

Bits 2-4, 7, 13-15, 21-23, 28-29, 31 are reserved.

Permission Checking Logic

1. Get the user's role -> role.Permissions (base)
2. If (base & ADMINISTRATOR) != 0 -> ALLOW everything
3. Get channel_overrides for (channel_id, role_id) -> allow, deny
4. effective = (base & ~deny) | allow
5. Check: (effective & required_permission) != 0

Deny is applied first (strips bits), then allow (adds bits), so allow wins when both target the same bit — matching Discord's channel-override semantics (permissions.EffectivePerms).

DM channels bypass role permissions entirely and use participant-based authorization instead.

Default Role Permission Values

Role	Hex	Permissions
Owner	0x7FFFFFFF	Everything including ADMINISTRATOR
Admin	0x3FFFFFFF	Everything except ADMINISTRATOR
Moderator	0x000FFFFF	All message + voice + moderation
Member	0x1E63	Send, read, attach, react, voice, video, screen share