diff --git a/Server/service/moderation.go b/Server/service/moderation.go
new file mode 100644
index 00000000..232b2a98
--- /dev/null
+++ b/Server/service/moderation.go
@@ -0,0 +1,69 @@
+package service
+
+import (
+	"fmt"
+	"log/slog"
+	"time"
+
+	"github.com/owncord/server/store"
+)
+
+// ModerationService handles user ban/unban operations.
+type ModerationService struct {
+	st store.Store
+}
+
+// NewModerationService creates a ModerationService.
+func NewModerationService(st store.Store) *ModerationService {
+	return &ModerationService{st: st}
+}
+
+// BanUser bans a target user. Validates the target exists and
+// prevents self-banning.
+func (s *ModerationService) BanUser(actorID, targetID int64, reason string, expires *time.Time) error {
+	if targetID <= 0 {
+		return fmt.Errorf("%w: user_id must be positive", ErrBadRequest)
+	}
+	if actorID == targetID {
+		return fmt.Errorf("%w: cannot ban yourself", ErrBadRequest)
+	}
+
+	target, err := s.st.GetUserByID(targetID)
+	if err != nil || target == nil {
+		return fmt.Errorf("%w: user not found", ErrNotFound)
+	}
+
+	if err := s.st.BanUser(targetID, reason, expires); err != nil {
+		return fmt.Errorf("%w: failed to ban user", ErrInternal)
+	}
+
+	if err := s.st.LogAudit(actorID, "ban", "user", targetID, reason); err != nil {
+		slog.Error("failed to log audit entry", "error", err)
+	}
+
+	slog.Info("user banned", "actor_id", actorID, "target_id", targetID, "reason", reason)
+	return nil
+}
+
+// UnbanUser removes a ban on a target user.
+func (s *ModerationService) UnbanUser(actorID, targetID int64) error {
+	if targetID <= 0 {
+		return fmt.Errorf("%w: user_id must be positive", ErrBadRequest)
+	}
+
+	target, err := s.st.GetUserByID(targetID)
+	if err != nil || target == nil {
+		return fmt.Errorf("%w: user not found", ErrNotFound)
+	}
+
+	if err := s.st.UnbanUser(targetID); err != nil {
+		return fmt.Errorf("%w: failed to unban user", ErrInternal)
+	}
+
+	if err := s.st.LogAudit(actorID, "unban", "user", targetID, ""); err != nil {
+		slog.Error("failed to log audit entry", "error", err)
+	}
+
+	slog.Info("user unbanned", "actor_id", actorID, "target_id", targetID)
+	return nil
+}
diff --git a/Server/service/permission_test.go b/Server/service/permission_test.go
new file mode 100644
index 00000000..b1e58c4c
--- /dev/null
+++ b/Server/service/permission_test.go
@@ -0,0 +1,192 @@
+package service
+
+import (
+	"testing"
+	"time"
+
+	"github.com/owncord/server/db"
+	"github.com/owncord/server/permissions"
+	"github.com/owncord/server/store"
+)
+
+// newTestPermService creates a PermissionService backed by a MemStore
+// pre-populated with a single role and user.
+func newTestPermService() (*PermissionService, *store.MemStore) {
+	ms := store.NewMemStore()
+	ms.SeedRole(&db.Role{
+		ID:          permissions.MemberRoleID,
+		Name:        "member",
+		Permissions: permissions.SendMessages | permissions.ReadMessages | permissions.AddReactions,
+		Position:    1,
+	})
+	ms.SeedUserRole(1, permissions.MemberRoleID)
+	checker := permissions.NewChecker(ms)
+	return NewPermissionService(ms, checker), ms
+}
+
+func TestHasChannelPerm_Allowed(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// Member has SendMessages | ReadMessages; no overrides exist, so base role perms apply.
+	if !svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected user to have SendMessages permission")
+	}
+	if !svc.HasChannelPerm(1, 10, permissions.ReadMessages) {
+		t.Fatal("expected user to have ReadMessages permission")
+	}
+}
+
+func TestHasChannelPerm_Denied(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// ManageMessages is NOT in the member role.
+	if svc.HasChannelPerm(1, 10, permissions.ManageMessages) {
+		t.Fatal("expected user to NOT have ManageMessages permission")
+	}
+}
+
+func TestHasChannelPerm_OverrideDeny(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "readonly", Type: "text"})
+	// Deny SendMessages for this channel.
+	ms.SeedChannelOverride(permissions.MemberRoleID, 10, 0, permissions.SendMessages)
+	// Invalidate so next check re-populates cache.
+	svc.InvalidateAll()
+
+	if svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected SendMessages to be denied via channel override")
+	}
+	// ReadMessages should still be allowed.
+	if !svc.HasChannelPerm(1, 10, permissions.ReadMessages) {
+		t.Fatal("expected ReadMessages to remain allowed")
+	}
+}
+
+func TestHasChannelPerm_OverrideAllow(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "special", Type: "text"})
+	// Allow ManageMessages (not in base role) via channel override.
+	ms.SeedChannelOverride(permissions.MemberRoleID, 10, permissions.ManageMessages, 0)
+	svc.InvalidateAll()
+
+	if !svc.HasChannelPerm(1, 10, permissions.ManageMessages) {
+		t.Fatal("expected ManageMessages to be allowed via channel override")
+	}
+}
+
+func TestHasChannelPerm_AdminBypass(t *testing.T) {
+	ms := store.NewMemStore()
+	ms.SeedRole(&db.Role{
+		ID:          permissions.AdminRoleID,
+		Name:        "admin",
+		Permissions: permissions.Administrator,
+		Position:    90,
+	})
+	ms.SeedUserRole(1, permissions.AdminRoleID)
+	checker := permissions.NewChecker(ms)
+	svc := NewPermissionService(ms, checker)
+
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "locked", Type: "text"})
+	// Deny everything via override; admin should still bypass.
+	ms.SeedChannelOverride(permissions.AdminRoleID, 10, 0, permissions.SendMessages|permissions.ReadMessages)
+
+	if !svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("admin should bypass all permission checks")
+	}
+	if !svc.HasChannelPerm(1, 10, permissions.ManageMessages) {
+		t.Fatal("admin should bypass all permission checks")
+	}
+}
+
+func TestInvalidateUser_ClearsCacheForUser(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// Populate cache.
+	svc.HasChannelPerm(1, 10, permissions.SendMessages)
+
+	// Now add a deny override.
+	ms.SeedChannelOverride(permissions.MemberRoleID, 10, 0, permissions.SendMessages)
+
+	// Without invalidation, cache still says allowed.
+	if !svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected cached value to still allow SendMessages")
+	}
+
+	// After invalidation, should pick up the override.
+	svc.InvalidateUser(1)
+	if svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected SendMessages to be denied after cache invalidation")
+	}
+}
+
+func TestInvalidateAll_ClearsEntireCache(t *testing.T) {
+	svc, ms := newTestPermService()
+	// Add a second user.
+	ms.SeedUserRole(2, permissions.MemberRoleID)
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// Populate cache for both users.
+	svc.HasChannelPerm(1, 10, permissions.SendMessages)
+	svc.HasChannelPerm(2, 10, permissions.SendMessages)
+
+	// Add deny override.
+	ms.SeedChannelOverride(permissions.MemberRoleID, 10, 0, permissions.SendMessages)
+
+	// Both still cached as allowed.
+	if !svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected cached allow for user 1")
+	}
+	if !svc.HasChannelPerm(2, 10, permissions.SendMessages) {
+		t.Fatal("expected cached allow for user 2")
+	}
+
+	svc.InvalidateAll()
+
+	// Both should now see the deny.
+	if svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected deny for user 1 after InvalidateAll")
+	}
+	if svc.HasChannelPerm(2, 10, permissions.SendMessages) {
+		t.Fatal("expected deny for user 2 after InvalidateAll")
+	}
+}
+
+func TestPermCacheTTLExpiry(t *testing.T) {
+	// This test verifies the cache TTL mechanism. We cannot easily wait 30s
+	// in a unit test, so we verify the structural behavior: after manually
+	// backdating the populatedAt field the cache should be stale and the
+	// next check should re-populate from the store.
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// Populate cache.
+	svc.HasChannelPerm(1, 10, permissions.SendMessages)
+
+	// Add deny override.
+	ms.SeedChannelOverride(permissions.MemberRoleID, 10, 0, permissions.SendMessages)
+
+	// Manually expire the cache entry by backdating populatedAt.
+	svc.mu.Lock()
+	if cp, ok := svc.cache[int64(1)]; ok {
+		cp.populatedAt = time.Now().Add(-permCacheTTL - time.Second)
+	}
+	svc.mu.Unlock()
+
+	// The next call should re-populate and pick up the deny.
+	if svc.HasChannelPerm(1, 10, permissions.SendMessages) {
+		t.Fatal("expected cache TTL expiry to cause re-population with deny override")
+	}
+}
+
+func TestHasChannelPerm_UnknownUserReturnsFalse(t *testing.T) {
+	svc, ms := newTestPermService()
+	ms.SeedChannel(&db.Channel{ID: 10, Name: "general", Type: "text"})
+
+	// User 999 has no role assigned.
+	if svc.HasChannelPerm(999, 10, permissions.SendMessages) {
+		t.Fatal("expected false for unknown user")
+	}
+}
diff --git a/Server/service/service.go b/Server/service/service.go
index 6358bcc4..c8d7ecee 100644
--- a/Server/service/service.go
+++ b/Server/service/service.go
@@ -20,6 +20,8 @@ type Services struct {
 	DMs         *DMService
 	Invites     *InviteService
 	Blocks      *BlockService
+	Moderation  *ModerationService
+	Voice       *VoiceService
 }
 
 // New creates all domain services wired together.
@@ -34,5 +36,7 @@ func New(st store.Store, limiter *auth.RateLimiter) *Services {
 		DMs:         NewDMService(st),
 		Invites:     NewInviteService(st),
 		Blocks:      NewBlockService(st),
+		Moderation:  NewModerationService(st),
+		Voice:       NewVoiceService(st, permSvc),
 	}
 }
diff --git a/Server/service/voice.go b/Server/service/voice.go
new file mode 100644
index 00000000..6a2ba2e8
--- /dev/null
+++ b/Server/service/voice.go
@@ -0,0 +1,137 @@
+package service
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+
+	"github.com/owncord/server/db"
+	"github.com/owncord/server/permissions"
+	"github.com/owncord/server/store"
+)
+
+// VoiceService handles voice state business logic.
+type VoiceService struct {
+	st   store.Store
+	perm *PermissionService
+}
+
+// NewVoiceService creates a VoiceService.
+func NewVoiceService(st store.Store, perm *PermissionService) *VoiceService {
+	return &VoiceService{st: st, perm: perm}
+}
+
+// JoinChannel validates the channel, checks ConnectVoice permission, and
+// joins the user to the voice channel respecting capacity limits.
+// Returns the channel on success so callers can access voice config fields.
+func (s *VoiceService) JoinChannel(userID, channelID int64) (*db.Channel, error) {
+	if channelID <= 0 {
+		return nil, fmt.Errorf("%w: channel_id must be a positive integer", ErrBadRequest)
+	}
+
+	ch, err := s.st.GetChannel(channelID)
+	if err != nil || ch == nil {
+		return nil, fmt.Errorf("%w: channel not found", ErrNotFound)
+	}
+
+	if !s.perm.HasChannelPerm(userID, channelID, permissions.ConnectVoice) {
+		return nil, fmt.Errorf("%w: missing CONNECT_VOICE permission", ErrForbidden)
+	}
+
+	maxUsers := ch.VoiceMaxUsers
+	if maxUsers > 0 {
+		if err := s.st.JoinVoiceChannelIfCapacity(userID, channelID, maxUsers); err != nil {
+			if errors.Is(err, db.ErrChannelFull) {
+				return nil, fmt.Errorf("%w: voice channel is full", ErrForbidden)
+			}
+			slog.Error("VoiceService.JoinChannel JoinVoiceChannelIfCapacity", "err", err, "user_id", userID)
+			return nil, fmt.Errorf("%w: failed to join voice channel", ErrInternal)
+		}
+	} else {
+		if err := s.st.JoinVoiceChannel(userID, channelID); err != nil {
+			slog.Error("VoiceService.JoinChannel JoinVoiceChannel", "err", err, "user_id", userID)
+			return nil, fmt.Errorf("%w: failed to join voice channel", ErrInternal)
+		}
+	}
+
+	slog.Info("voice join", "user_id", userID, "channel_id", channelID)
+	return ch, nil
+}
+
+// LeaveChannel removes the user from their current voice channel.
+func (s *VoiceService) LeaveChannel(userID int64) error {
+	if err := s.st.LeaveVoiceChannel(userID); err != nil {
+		slog.Error("VoiceService.LeaveChannel", "err", err, "user_id", userID)
+		return fmt.Errorf("%w: failed to leave voice channel", ErrInternal)
+	}
+
+	slog.Info("voice leave", "user_id", userID)
+	return nil
+}
+
+// UpdateMute toggles the mute state for the given user.
+func (s *VoiceService) UpdateMute(userID int64, muted bool) error {
+	if err := s.st.UpdateVoiceMute(userID, muted); err != nil {
+		slog.Error("VoiceService.UpdateMute", "err", err, "user_id", userID)
+		return fmt.Errorf("%w: failed to update mute state", ErrInternal)
+	}
+
+	slog.Debug("voice mute changed", "user_id", userID, "muted", muted)
+	return nil
+}
+
+// UpdateDeafen toggles the deafen state for the given user.
+func (s *VoiceService) UpdateDeafen(userID int64, deafened bool) error {
+	if err := s.st.UpdateVoiceDeafen(userID, deafened); err != nil {
+		slog.Error("VoiceService.UpdateDeafen", "err", err, "user_id", userID)
+		return fmt.Errorf("%w: failed to update deafen state", ErrInternal)
+	}
+
+	slog.Debug("voice deafen changed", "user_id", userID, "deafened", deafened)
+	return nil
+}
+
+// ToggleCamera enables or disables the user's camera. When enabling, it
+// enforces the maxVideo limit via an atomic check-and-update. Returns true
+// if the camera was successfully enabled (or disabled), false if the video
+// limit was reached.
+func (s *VoiceService) ToggleCamera(userID, channelID int64, enable bool, maxVideo int) (bool, error) {
+	if !s.perm.HasChannelPerm(userID, channelID, permissions.UseVideo) {
+		return false, fmt.Errorf("%w: missing USE_VIDEO permission", ErrForbidden)
+	}
+
+	if enable && maxVideo > 0 {
+		ok, err := s.st.EnableCameraIfUnderLimit(userID, channelID, maxVideo)
+		if err != nil {
+			slog.Error("VoiceService.ToggleCamera EnableCameraIfUnderLimit", "err", err, "user_id", userID)
+			return false, fmt.Errorf("%w: failed to check video limit", ErrInternal)
+		}
+		if !ok {
+			return false, nil
+		}
+	} else {
+		if err := s.st.UpdateVoiceCamera(userID, enable); err != nil {
+			slog.Error("VoiceService.ToggleCamera UpdateVoiceCamera", "err", err, "user_id", userID)
+			return false, fmt.Errorf("%w: failed to update camera state", ErrInternal)
+		}
+	}
+
+	slog.Debug("voice camera changed", "user_id", userID, "enabled", enable, "channel_id", channelID)
+	return true, nil
+}
+
+// ToggleScreenshare enables or disables the user's screen share after
+// checking the ShareScreen permission.
+func (s *VoiceService) ToggleScreenshare(userID, channelID int64, enable bool) error {
+	if !s.perm.HasChannelPerm(userID, channelID, permissions.ShareScreen) {
+		return fmt.Errorf("%w: missing SHARE_SCREEN permission", ErrForbidden)
+	}
+
+	if err := s.st.UpdateVoiceScreenshare(userID, enable); err != nil {
+		slog.Error("VoiceService.ToggleScreenshare", "err", err, "user_id", userID)
+		return fmt.Errorf("%w: failed to update screenshare state", ErrInternal)
+	}
+
+	slog.Debug("voice screenshare changed", "user_id", userID, "enabled", enable, "channel_id", channelID)
+	return nil
+}
diff --git a/Server/store/memstore.go b/Server/store/memstore.go
new file mode 100644
index 00000000..109c0940
--- /dev/null
+++ b/Server/store/memstore.go
@@ -0,0 +1,760 @@
+package store
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/owncord/server/db"
+)
+
+// compile-time interface check
+var _ Store = (*MemStore)(nil)
+
+// MemStore is a lightweight in-memory Store implementation for testing.
+// Only the methods needed by service-layer tests are implemented;
+// everything else panics with a descriptive message.
+type MemStore struct {
+	mu sync.Mutex
+
+	// auto-increment counters
+	nextMsgID     int64
+	nextChannelID int64
+
+	channels map[int64]*db.Channel
+	messages map[int64]*db.Message
+	users    map[int64]*db.User
+	roles    map[int64]*db.Role
+	// userID -> roleID
+	userRoles map[int64]int64
+	// roleID -> channelID -> override
+	channelOverrides map[int64]map[int64]db.ChannelOverride
+	// messageID -> userID -> emoji -> bool
+	reactions map[int64]map[int64]map[string]bool
+	// channelID -> set of participant userIDs
+	dmParticipants map[int64]map[int64]bool
+	// blockerID -> blockedID -> bool (bidirectional checked via IsEitherBlocked)
+	blocks map[int64]map[int64]bool
+	// userID -> channelID -> lastReadMessageID
+	readStates map[int64]map[int64]int64
+}
+
+// NewMemStore creates an empty MemStore ready for use.
+func NewMemStore() *MemStore {
+	return &MemStore{
+		channels:         make(map[int64]*db.Channel),
+		messages:         make(map[int64]*db.Message),
+		users:            make(map[int64]*db.User),
+		roles:            make(map[int64]*db.Role),
+		userRoles:        make(map[int64]int64),
+		channelOverrides: make(map[int64]map[int64]db.ChannelOverride),
+		reactions:        make(map[int64]map[int64]map[string]bool),
+		dmParticipants:   make(map[int64]map[int64]bool),
+		blocks:           make(map[int64]map[int64]bool),
+		readStates:       make(map[int64]map[int64]int64),
+	}
+}
+
+// ---------- helpers for test setup ----------
+
+// SeedChannel inserts a channel directly (for test setup).
+func (m *MemStore) SeedChannel(ch *db.Channel) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.channels[ch.ID] = ch
+	if ch.ID >= m.nextChannelID {
+		m.nextChannelID = ch.ID + 1
+	}
+}
+
+// SeedUser inserts a user directly (for test setup).
+func (m *MemStore) SeedUser(u *db.User) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.users[u.ID] = u
+}
+
+// SeedRole inserts a role directly (for test setup).
+func (m *MemStore) SeedRole(r *db.Role) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.roles[r.ID] = r
+}
+
+// SeedUserRole assigns a role to a user (for test setup).
+func (m *MemStore) SeedUserRole(userID, roleID int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.userRoles[userID] = roleID
+}
+
+// SeedChannelOverride sets a channel permission override for a role (for test setup).
+func (m *MemStore) SeedChannelOverride(roleID, channelID int64, allow, deny int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.channelOverrides[roleID] == nil {
+		m.channelOverrides[roleID] = make(map[int64]db.ChannelOverride)
+	}
+	m.channelOverrides[roleID][channelID] = db.ChannelOverride{Allow: allow, Deny: deny}
+}
+
+// SeedDMParticipant adds a user as a DM participant in a channel (for test setup).
+func (m *MemStore) SeedDMParticipant(channelID, userID int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.dmParticipants[channelID] == nil {
+		m.dmParticipants[channelID] = make(map[int64]bool)
+	}
+	m.dmParticipants[channelID][userID] = true
+}
+
+// SeedBlock records a block relationship (for test setup).
+func (m *MemStore) SeedBlock(blockerID, blockedID int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.blocks[blockerID] == nil {
+		m.blocks[blockerID] = make(map[int64]bool)
+	}
+	m.blocks[blockerID][blockedID] = true
+}
+
+// ---------- Store interface: top-level ----------
+
+func (m *MemStore) Close() error                                              { return nil }
+func (m *MemStore) SQLDb() *sql.DB                                            { return nil }
+func (m *MemStore) WithTx(_ context.Context, fn func(Store) error) error      { return fn(m) }
+
+// ---------- MessageStore ----------
+
+func (m *MemStore) CreateMessage(channelID, userID int64, content string, replyTo *int64) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.nextMsgID++
+	id := m.nextMsgID
+	m.messages[id] = &db.Message{
+		ID:        id,
+		ChannelID: channelID,
+		UserID:    userID,
+		Content:   content,
+		ReplyTo:   replyTo,
+		Timestamp: time.Now().UTC().Format(time.RFC3339),
+	}
+	return id, nil
+}
+
+func (m *MemStore) GetMessage(id int64) (*db.Message, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	msg, ok := m.messages[id]
+	if !ok {
+		return nil, fmt.Errorf("message %d not found", id)
+	}
+	// Return a copy to avoid aliasing.
+	cp := *msg
+	return &cp, nil
+}
+
+func (m *MemStore) GetMessages(_ int64, _ int64, _ int) ([]db.MessageWithUser, error) {
+	panic("memstore: not implemented: GetMessages")
+}
+
+func (m *MemStore) GetMessagesForAPI(_ int64, _ int64, _ int, _ int64) ([]db.MessageAPIResponse, error) {
+	return []db.MessageAPIResponse{}, nil
+}
+
+func (m *MemStore) EditMessage(id, userID int64, content string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	msg, ok := m.messages[id]
+	if !ok {
+		return fmt.Errorf("message %d not found", id)
+	}
+	if msg.UserID != userID {
+		return fmt.Errorf("not message owner")
+	}
+	now := time.Now().UTC().Format(time.RFC3339)
+	msg.Content = content
+	msg.EditedAt = &now
+	return nil
+}
+
+func (m *MemStore) DeleteMessage(id, userID int64, isMod bool) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	msg, ok := m.messages[id]
+	if !ok {
+		return fmt.Errorf("message %d not found", id)
+	}
+	if !isMod && msg.UserID != userID {
+		return fmt.Errorf("not message owner")
+	}
+	msg.Deleted = true
+	return nil
+}
+
+func (m *MemStore) SearchMessages(_ string, _ *int64, _ int) ([]db.MessageSearchResult, error) {
+	return []db.MessageSearchResult{}, nil
+}
+
+func (m *MemStore) SearchMessagesInChannels(_ string, _ []int64, _ int) ([]db.MessageSearchResult, error) {
+	return []db.MessageSearchResult{}, nil
+}
+
+func (m *MemStore) GetPinnedMessages(_ int64, _ int64) ([]db.MessageAPIResponse, error) {
+	return []db.MessageAPIResponse{}, nil
+}
+
+func (m *MemStore) SetMessagePinned(_ int64, _ bool) error { return nil }
+
+func (m *MemStore) AddReaction(messageID, userID int64, emoji string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if _, ok := m.messages[messageID]; !ok {
+		return fmt.Errorf("message %d not found", messageID)
+	}
+	if m.reactions[messageID] == nil {
+		m.reactions[messageID] = make(map[int64]map[string]bool)
+	}
+	if m.reactions[messageID][userID] == nil {
+		m.reactions[messageID][userID] = make(map[string]bool)
+	}
+	if m.reactions[messageID][userID][emoji] {
+		return fmt.Errorf("reaction already exists")
+	}
+	m.reactions[messageID][userID][emoji] = true
+	return nil
+}
+
+func (m *MemStore) RemoveReaction(messageID, userID int64, emoji string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.reactions[messageID] == nil || m.reactions[messageID][userID] == nil || !m.reactions[messageID][userID][emoji] {
+		return fmt.Errorf("reaction not found")
+	}
+	delete(m.reactions[messageID][userID], emoji)
+	return nil
+}
+
+func (m *MemStore) GetReactions(_ int64) ([]db.ReactionCount, error) {
+	return []db.ReactionCount{}, nil
+}
+
+func (m *MemStore) UpdateReadState(userID, channelID, lastReadMessageID int64) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.readStates[userID] == nil {
+		m.readStates[userID] = make(map[int64]int64)
+	}
+	m.readStates[userID][channelID] = lastReadMessageID
+	return nil
+}
+
+func (m *MemStore) GetChannelUnreadCounts(_ int64) (map[int64]db.ChannelUnread, error) {
+	return map[int64]db.ChannelUnread{}, nil
+}
+
+func (m *MemStore) GetLatestMessageID(channelID int64) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	var latest int64
+	for _, msg := range m.messages {
+		if msg.ChannelID == channelID && msg.ID > latest {
+			latest = msg.ID
+		}
+	}
+	return latest, nil
+}
+
+func (m *MemStore) LinkAttachmentsToMessage(_ int64, _ []string) (int64, error) {
+	return 0, nil
+}
+
+func (m *MemStore) GetAttachmentsByMessageIDs(_ []int64) (map[int64][]db.AttachmentInfo, error) {
+	return map[int64][]db.AttachmentInfo{}, nil
+}
+
+// ---------- ChannelStore ----------
+
+func (m *MemStore) ListChannels() ([]db.Channel, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]db.Channel, 0, len(m.channels))
+	for _, ch := range m.channels {
+		out = append(out, *ch)
+	}
+	return out, nil
+}
+
+func (m *MemStore) GetChannel(id int64) (*db.Channel, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	ch, ok := m.channels[id]
+	if !ok {
+		return nil, fmt.Errorf("channel %d not found", id)
+	}
+	cp := *ch
+	return &cp, nil
+}
+
+func (m *MemStore) CreateChannel(name, chanType, category, topic string, position int) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	m.nextChannelID++
+	id := m.nextChannelID
+	m.channels[id] = &db.Channel{
+		ID:        id,
+		Name:      name,
+		Type:      chanType,
+		Category:  category,
+		Topic:     topic,
+		Position:  position,
+		CreatedAt: time.Now().UTC().Format(time.RFC3339),
+	}
+	return id, nil
+}
+
+func (m *MemStore) UpdateChannel(_ int64, _, _ string, _ int) error {
+	panic("memstore: not implemented: UpdateChannel")
+}
+
+func (m *MemStore) DeleteChannel(_ int64) error {
+	panic("memstore: not implemented: DeleteChannel")
+}
+
+func (m *MemStore) SetChannelSlowMode(_ int64, _ int) error {
+	panic("memstore: not implemented: SetChannelSlowMode")
+}
+
+func (m *MemStore) SetChannelVoiceMaxUsers(_ int64, _ int) error {
+	panic("memstore: not implemented: SetChannelVoiceMaxUsers")
+}
+
+func (m *MemStore) GetChannelPermissions(channelID, roleID int64) (int64, int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	overrides, ok := m.channelOverrides[roleID]
+	if !ok {
+		return 0, 0, nil
+	}
+	o, ok := overrides[channelID]
+	if !ok {
+		return 0, 0, nil
+	}
+	return o.Allow, o.Deny, nil
+}
+
+func (m *MemStore) GetAllChannelPermissionsForRole(roleID int64) (map[int64]db.ChannelOverride, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	overrides, ok := m.channelOverrides[roleID]
+	if !ok {
+		return map[int64]db.ChannelOverride{}, nil
+	}
+	// Copy map.
+	out := make(map[int64]db.ChannelOverride, len(overrides))
+	for k, v := range overrides {
+		out[k] = v
+	}
+	return out, nil
+}
+
+func (m *MemStore) GetChannelTypes(_ []int64) (map[int64]string, error) {
+	panic("memstore: not implemented: GetChannelTypes")
+}
+
+// ---------- UserStore ----------
+
+func (m *MemStore) GetUserByID(id int64) (*db.User, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	u, ok := m.users[id]
+	if !ok {
+		return nil, fmt.Errorf("user %d not found", id)
+	}
+	cp := *u
+	return &cp, nil
+}
+
+func (m *MemStore) GetUserByUsername(_ string) (*db.User, error) {
+	panic("memstore: not implemented: GetUserByUsername")
+}
+
+func (m *MemStore) CreateUser(_, _ string, _ int) (int64, error) {
+	panic("memstore: not implemented: CreateUser")
+}
+
+func (m *MemStore) CreateOwnerIfEmpty(_, _ string, _ int) (int64, error) {
+	panic("memstore: not implemented: CreateOwnerIfEmpty")
+}
+
+func (m *MemStore) CreateUserWithInvite(_, _ string, _ int, _ string) (int64, error) {
+	panic("memstore: not implemented: CreateUserWithInvite")
+}
+
+func (m *MemStore) UpdateUserProfile(_ int64, _ string, _ *string) error {
+	panic("memstore: not implemented: UpdateUserProfile")
+}
+
+func (m *MemStore) UpdateUserPassword(_ int64, _ string) error {
+	panic("memstore: not implemented: UpdateUserPassword")
+}
+
+func (m *MemStore) UpdateUserStatus(id int64, status string) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	u, ok := m.users[id]
+	if !ok {
+		return fmt.Errorf("user %d not found", id)
+	}
+	u.Status = status
+	return nil
+}
+
+func (m *MemStore) UpdateUserTOTPSecret(_ int64, _ *string) error {
+	panic("memstore: not implemented: UpdateUserTOTPSecret")
+}
+
+func (m *MemStore) UpdateUserRole(_ int64, _ int64) error {
+	panic("memstore: not implemented: UpdateUserRole")
+}
+
+func (m *MemStore) ResetAllUserStatuses() error {
+	panic("memstore: not implemented: ResetAllUserStatuses")
+}
+
+func (m *MemStore) DeleteAccount(_ context.Context, _ int64) error {
+	panic("memstore: not implemented: DeleteAccount")
+}
+
+func (m *MemStore) ListMembers() ([]db.MemberSummary, error) {
+	panic("memstore: not implemented: ListMembers")
+}
+
+// ---------- SessionStore ----------
+
+func (m *MemStore) CreateSession(_ int64, _, _, _ string) (int64, error) {
+	panic("memstore: not implemented: CreateSession")
+}
+
+func (m *MemStore) GetSessionByTokenHash(_ string) (*db.Session, error) {
+	panic("memstore: not implemented: GetSessionByTokenHash")
+}
+
+func (m *MemStore) GetSessionWithBanStatus(_ string) (*db.SessionWithBanStatus, error) {
+	panic("memstore: not implemented: GetSessionWithBanStatus")
+}
+
+func (m *MemStore) DeleteSession(_ string) error {
+	panic("memstore: not implemented: DeleteSession")
+}
+
+func (m *MemStore) DeleteOtherSessions(_ int64, _ int64) (int64, error) {
+	panic("memstore: not implemented: DeleteOtherSessions")
+}
+
+func (m *MemStore) DeleteExpiredSessions() error {
+	panic("memstore: not implemented: DeleteExpiredSessions")
+}
+
+func (m *MemStore) DeleteSessionByID(_ int64, _ int64) error {
+	panic("memstore: not implemented: DeleteSessionByID")
+}
+
+func (m *MemStore) TouchSession(_ string) error {
+	panic("memstore: not implemented: TouchSession")
+}
+
+func (m *MemStore) ListUserSessions(_ int64) ([]db.Session, error) {
+	panic("memstore: not implemented: ListUserSessions")
+}
+
+func (m *MemStore) ForceLogoutUser(_ int64) error {
+	panic("memstore: not implemented: ForceLogoutUser")
+}
+
+func (m *MemStore) GetUserSessions(_ int64) ([]db.Session, error) {
+	panic("memstore: not implemented: GetUserSessions")
+}
+
+// ---------- RoleStore ----------
+
+func (m *MemStore) GetRoleByID(id int64) (*db.Role, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	r, ok := m.roles[id]
+	if !ok {
+		return nil, fmt.Errorf("role %d not found", id)
+	}
+	cp := *r
+	return &cp, nil
+}
+
+func (m *MemStore) GetRoleForUser(userID int64) (*db.Role, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	roleID, ok := m.userRoles[userID]
+	if !ok {
+		return nil, fmt.Errorf("no role for user %d", userID)
+	}
+	r, ok := m.roles[roleID]
+	if !ok {
+		return nil, fmt.Errorf("role %d not found", roleID)
+	}
+	cp := *r
+	return &cp, nil
+}
+
+func (m *MemStore) GetUserWithRole(_ int64) (*db.User, *db.Role, error) {
+	panic("memstore: not implemented: GetUserWithRole")
+}
+
+func (m *MemStore) ListRoles() ([]*db.Role, error) {
+	panic("memstore: not implemented: ListRoles")
+}
+
+// ---------- InviteStore ----------
+
+func (m *MemStore) CreateInvite(_ int64, _ int, _ *time.Time) (string, error) {
+	panic("memstore: not implemented: CreateInvite")
+}
+
+func (m *MemStore) GetInvite(_ string) (*db.Invite, error) {
+	panic("memstore: not implemented: GetInvite")
+}
+
+func (m *MemStore) ListInvites() ([]*db.Invite, error) {
+	panic("memstore: not implemented: ListInvites")
+}
+
+func (m *MemStore) UseInviteAtomic(_ string) error {
+	panic("memstore: not implemented: UseInviteAtomic")
+}
+
+func (m *MemStore) RevokeInvite(_ string) error {
+	panic("memstore: not implemented: RevokeInvite")
+}
+
+// ---------- VoiceStore ----------
+
+func (m *MemStore) JoinVoiceChannel(_ int64, _ int64) error {
+	panic("memstore: not implemented: JoinVoiceChannel")
+}
+
+func (m *MemStore) JoinVoiceChannelIfCapacity(_ int64, _ int64, _ int) error {
+	panic("memstore: not implemented: JoinVoiceChannelIfCapacity")
+}
+
+func (m *MemStore) LeaveVoiceChannel(_ int64) error {
+	panic("memstore: not implemented: LeaveVoiceChannel")
+}
+
+func (m *MemStore) LeaveVoiceChannelIfMatch(_ int64, _ int64, _ string) (bool, error) {
+	panic("memstore: not implemented: LeaveVoiceChannelIfMatch")
+}
+
+func (m *MemStore) GetVoiceState(_ int64) (*db.VoiceState, error) {
+	panic("memstore: not implemented: GetVoiceState")
+}
+
+func (m *MemStore) GetChannelVoiceStates(_ int64) ([]db.VoiceState, error) {
+	panic("memstore: not implemented: GetChannelVoiceStates")
+}
+
+func (m *MemStore) GetAllVoiceStates() ([]db.VoiceState, error) {
+	panic("memstore: not implemented: GetAllVoiceStates")
+}
+
+func (m *MemStore) UpdateVoiceMute(_ int64, _ bool) error {
+	panic("memstore: not implemented: UpdateVoiceMute")
+}
+
+func (m *MemStore) UpdateVoiceDeafen(_ int64, _ bool) error {
+	panic("memstore: not implemented: UpdateVoiceDeafen")
+}
+
+func (m *MemStore) ClearVoiceState(_ int64) error {
+	panic("memstore: not implemented: ClearVoiceState")
+}
+
+func (m *MemStore) ClearAllVoiceStates() error {
+	panic("memstore: not implemented: ClearAllVoiceStates")
+}
+
+func (m *MemStore) CountActiveCameras(_ int64) (int, error) {
+	panic("memstore: not implemented: CountActiveCameras")
+}
+
+func (m *MemStore) UpdateVoiceCamera(_ int64, _ bool) error {
+	panic("memstore: not implemented: UpdateVoiceCamera")
+}
+
+func (m *MemStore) EnableCameraIfUnderLimit(_ int64, _ int64, _ int) (bool, error) {
+	panic("memstore: not implemented: EnableCameraIfUnderLimit")
+}
+
+func (m *MemStore) UpdateVoiceScreenshare(_ int64, _ bool) error {
+	panic("memstore: not implemented: UpdateVoiceScreenshare")
+}
+
+func (m *MemStore) CountChannelVoiceUsers(_ int64) (int, error) {
+	panic("memstore: not implemented: CountChannelVoiceUsers")
+}
+
+// ---------- DMStore ----------
+
+func (m *MemStore) GetOrCreateDMChannel(_ int64, _ int64) (*db.Channel, bool, error) {
+	panic("memstore: not implemented: GetOrCreateDMChannel")
+}
+
+func (m *MemStore) GetUserDMChannels(_ int64) ([]db.DMChannelInfo, error) {
+	return []db.DMChannelInfo{}, nil
+}
+
+func (m *MemStore) OpenDM(_, _ int64) error  { return nil }
+func (m *MemStore) CloseDM(_, _ int64) error { return nil }
+
+func (m *MemStore) IsDMParticipant(userID, channelID int64) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	participants, ok := m.dmParticipants[channelID]
+	if !ok {
+		return false, nil
+	}
+	return participants[userID], nil
+}
+
+func (m *MemStore) GetDMParticipantIDs(channelID int64) ([]int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	participants, ok := m.dmParticipants[channelID]
+	if !ok {
+		return []int64{}, nil
+	}
+	ids := make([]int64, 0, len(participants))
+	for id := range participants {
+		ids = append(ids, id)
+	}
+	return ids, nil
+}
+
+func (m *MemStore) GetDMRecipient(_ int64, _ int64) (*db.User, error) {
+	return nil, nil
+}
+
+// ---------- BlockStore ----------
+
+func (m *MemStore) BlockUser(_, _ int64) error   { return nil }
+func (m *MemStore) UnblockUser(_, _ int64) error { return nil }
+
+func (m *MemStore) IsBlocked(blockerID, blockedID int64) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.blocks[blockerID] != nil && m.blocks[blockerID][blockedID] {
+		return true, nil
+	}
+	return false, nil
+}
+
+func (m *MemStore) IsEitherBlocked(userA, userB int64) (bool, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.blocks[userA] != nil && m.blocks[userA][userB] {
+		return true, nil
+	}
+	if m.blocks[userB] != nil && m.blocks[userB][userA] {
+		return true, nil
+	}
+	return false, nil
+}
+
+func (m *MemStore) ListBlockedUsers(_ int64) ([]int64, error) {
+	return []int64{}, nil
+}
+
+// ---------- AttachmentStore ----------
+
+func (m *MemStore) CreateAttachment(_ string, _ int64, _, _, _ string, _ int64, _, _ *int) error {
+	panic("memstore: not implemented: CreateAttachment")
+}
+
+func (m *MemStore) GetAttachmentByID(_ string) (*db.Attachment, error) {
+	panic("memstore: not implemented: GetAttachmentByID")
+}
+
+func (m *MemStore) GetAttachmentWithChannel(_ string) (*db.AttachmentAccess, error) {
+	panic("memstore: not implemented: GetAttachmentWithChannel")
+}
+
+func (m *MemStore) DeleteOrphanedAttachments(_ string) ([]string, error) {
+	panic("memstore: not implemented: DeleteOrphanedAttachments")
+}
+
+// ---------- AdminStore ----------
+
+func (m *MemStore) UserCount() (int64, error) {
+	panic("memstore: not implemented: UserCount")
+}
+
+func (m *MemStore) GetServerStats() (*db.ServerStats, error) {
+	panic("memstore: not implemented: GetServerStats")
+}
+
+func (m *MemStore) ListAllUsers(_ int, _ int) ([]db.UserWithRole, error) {
+	panic("memstore: not implemented: ListAllUsers")
+}
+
+func (m *MemStore) BanUser(_ int64, _ string, _ *time.Time) error {
+	panic("memstore: not implemented: BanUser")
+}
+
+func (m *MemStore) UnbanUser(_ int64) error {
+	panic("memstore: not implemented: UnbanUser")
+}
+
+func (m *MemStore) LogAudit(_ int64, _, _ string, _ int64, _ string) error {
+	return nil
+}
+
+func (m *MemStore) GetAuditLog(_ int, _ int) ([]db.AuditEntry, error) {
+	panic("memstore: not implemented: GetAuditLog")
+}
+
+func (m *MemStore) AdminCreateChannel(_, _, _, _ string, _ int) (int64, error) {
+	panic("memstore: not implemented: AdminCreateChannel")
+}
+
+func (m *MemStore) AdminUpdateChannel(_ int64, _, _ string, _, _ int, _ bool) error {
+	panic("memstore: not implemented: AdminUpdateChannel")
+}
+
+func (m *MemStore) AdminDeleteChannel(_ int64) error {
+	panic("memstore: not implemented: AdminDeleteChannel")
+}
+
+func (m *MemStore) BackupTo(_ string) error {
+	panic("memstore: not implemented: BackupTo")
+}
+
+func (m *MemStore) BackupToSafe(_, _ string) error {
+	panic("memstore: not implemented: BackupToSafe")
+}
+
+func (m *MemStore) CountUsersWithoutTOTP() (int, error) {
+	panic("memstore: not implemented: CountUsersWithoutTOTP")
+}
+
+// ---------- SettingsStore ----------
+
+func (m *MemStore) GetSetting(_ string) (string, error) {
+	panic("memstore: not implemented: GetSetting")
+}
+
+func (m *MemStore) SetSetting(_, _ string) error {
+	panic("memstore: not implemented: SetSetting")
+}
+
+func (m *MemStore) GetAllSettings() (map[string]string, error) {
+	panic("memstore: not implemented: GetAllSettings")
+}