Changeset 0.29.0 (#195)

server/store/sqlite/audit.go

@@ -34,6 +34,9 @@ func (s *AuditStore) List(ctx context.Context, opts store.AuditListOptions) ([]m
 		al.ip_address, al.user_agent, al.created_at`, "audit_log al")
 	b.Join("LEFT JOIN users u ON al.actor_id = u.id")
 
+	if opts.TeamID != "" {
+		b.Where("al.actor_id IN (SELECT user_id FROM team_members WHERE team_id = ?)", opts.TeamID)
+	}
 	if opts.ActorID != "" {
 		b.Where("al.actor_id = ?", opts.ActorID)
 	}

server/store/sqlite/catalog.go

@@ -276,3 +276,58 @@ func scanCatalogEntries(rows *sql.Rows) ([]models.CatalogEntry, error) {
 	}
 	return result, rows.Err()
 }
+
+// ── CS2 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *CatalogStore) GetCapabilities(ctx context.Context, modelID, configID string) ([]byte, error) {
+	var capsJSON []byte
+	err := DB.QueryRowContext(ctx, `
+		SELECT capabilities FROM model_catalog
+		WHERE model_id = ? AND provider_config_id = ?
+	`, modelID, configID).Scan(&capsJSON)
+	if err != nil {
+		return nil, err
+	}
+	return capsJSON, nil
+}
+
+func (s *CatalogStore) GetCapabilitiesAny(ctx context.Context, modelID string) ([]byte, error) {
+	var capsJSON []byte
+	err := DB.QueryRowContext(ctx, `
+		SELECT capabilities FROM model_catalog
+		WHERE model_id = ? ORDER BY last_synced_at DESC LIMIT 1
+	`, modelID).Scan(&capsJSON)
+	if err != nil {
+		return nil, err
+	}
+	return capsJSON, nil
+}
+
+// ── CS6 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *CatalogStore) ListTeamAvailable(ctx context.Context) ([]store.TeamAvailableModel, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT mc.id, mc.model_id, mc.display_name, mc.visibility,
+		       ac.provider, ac.name AS provider_name
+		FROM model_catalog mc
+		JOIN provider_configs ac ON mc.provider_config_id = ac.id
+		WHERE mc.visibility IN ('enabled', 'team')
+		  AND ac.is_active = 1 AND ac.scope = 'global'
+		ORDER BY ac.name, mc.model_id
+	`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	results := make([]store.TeamAvailableModel, 0)
+	for rows.Next() {
+		var m store.TeamAvailableModel
+		if err := rows.Scan(&m.ID, &m.ModelID, &m.DisplayName, &m.Visibility,
+			&m.Provider, &m.ProviderName); err != nil {
+			continue
+		}
+		results = append(results, m)
+	}
+	return results, rows.Err()
+}

server/store/sqlite/catalog_mention.go

@@ -0,0 +1,57 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+)
+
+// ── Mention resolution (v0.29.0) ────────────────────────────────────────
+
+func (s *CatalogStore) FindEnabledByModelID(ctx context.Context, modelID string) (string, string, error) {
+	var foundModelID, configID string
+	err := DB.QueryRowContext(ctx, `
+		SELECT mc.model_id, mc.provider_config_id
+		FROM model_catalog mc
+		JOIN provider_configs pc ON pc.id = mc.provider_config_id
+		WHERE LOWER(mc.model_id) = LOWER(?)
+		  AND mc.visibility = 'enabled'
+		  AND pc.is_active = 1
+		ORDER BY
+			CASE pc.scope WHEN 'global' THEN 0 WHEN 'team' THEN 1 WHEN 'personal' THEN 2 END
+		LIMIT 1
+	`, modelID).Scan(&foundModelID, &configID)
+	if err == sql.ErrNoRows {
+		return "", "", nil
+	}
+	return foundModelID, configID, err
+}
+
+func (s *CatalogStore) FindEnabledByModelIDPrefix(ctx context.Context, prefix string) (string, string, int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(DISTINCT mc.model_id)
+		FROM model_catalog mc
+		JOIN provider_configs pc ON pc.id = mc.provider_config_id
+		WHERE LOWER(mc.model_id) LIKE LOWER(?)
+		  AND mc.visibility = 'enabled'
+		  AND pc.is_active = 1
+	`, prefix+"%").Scan(&count)
+	if err != nil {
+		return "", "", 0, err
+	}
+	if count != 1 {
+		return "", "", count, nil
+	}
+	var foundModelID, configID string
+	err = DB.QueryRowContext(ctx, `
+		SELECT mc.model_id, mc.provider_config_id
+		FROM model_catalog mc
+		JOIN provider_configs pc ON pc.id = mc.provider_config_id
+		WHERE LOWER(mc.model_id) LIKE LOWER(?)
+		  AND mc.visibility = 'enabled'
+		  AND pc.is_active = 1
+		ORDER BY CASE pc.scope WHEN 'global' THEN 0 WHEN 'team' THEN 1 WHEN 'personal' THEN 2 END
+		LIMIT 1
+	`, prefix+"%").Scan(&foundModelID, &configID)
+	return foundModelID, configID, 1, err
+}

server/store/sqlite/channel.go

@@ -477,3 +477,427 @@ func (s *ChannelStore) Purge(ctx context.Context, id string) error {
 	_, err = DB.ExecContext(ctx, `DELETE FROM channels WHERE id = ?`, id)
 	return err
 }
+// ── CS1 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *ChannelStore) FindExistingDM(ctx context.Context, userID1, userID2 string) (string, error) {
+	var channelID string
+	err := DB.QueryRowContext(ctx, `
+		SELECT cp1.channel_id FROM channel_participants cp1
+		JOIN channel_participants cp2 ON cp1.channel_id = cp2.channel_id
+		JOIN channels c ON c.id = cp1.channel_id
+		WHERE c.type = 'dm'
+		  AND cp1.participant_type = 'user' AND cp1.participant_id = ?
+		  AND cp2.participant_type = 'user' AND cp2.participant_id = ?
+		LIMIT 1
+	`, userID1, userID2).Scan(&channelID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return channelID, err
+}
+
+func (s *ChannelStore) GetUnreadCount(ctx context.Context, channelID, userID string) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(*) FROM messages m
+		JOIN channel_participants cp ON cp.channel_id = m.channel_id
+		WHERE cp.channel_id = ?
+		  AND cp.participant_type = 'user' AND cp.participant_id = ?
+		  AND m.created_at > cp.last_read_at
+	`, channelID, userID).Scan(&count)
+	return count, err
+}
+
+func (s *ChannelStore) DeleteByOwner(ctx context.Context, channelID, userID string) (int64, error) {
+	result, err := DB.ExecContext(ctx,
+		`DELETE FROM channels WHERE id = ? AND user_id = ?`,
+		channelID, userID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+func (s *ChannelStore) MarkRead(ctx context.Context, channelID, userID string) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE channel_participants
+		SET last_read_at = datetime('now')
+		WHERE channel_id = ? AND participant_type = 'user' AND participant_id = ?
+	`, channelID, userID)
+	if err != nil {
+		return nil
+	}
+
+	var latestMsgID *string
+	_ = DB.QueryRowContext(ctx, `
+		SELECT id FROM messages WHERE channel_id = ? ORDER BY created_at DESC LIMIT 1
+	`, channelID).Scan(&latestMsgID)
+	if latestMsgID != nil {
+		_, _ = DB.ExecContext(ctx, `
+			UPDATE channel_participants
+			SET last_read_message_id = ?
+			WHERE channel_id = ? AND participant_type = 'user' AND participant_id = ?
+		`, *latestMsgID, channelID, userID)
+	}
+
+	return nil
+}
+
+func (s *ChannelStore) CountParticipantsByType(ctx context.Context, channelID, pType string) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(*) FROM channel_participants
+		WHERE channel_id = ? AND participant_type = ?
+	`, channelID, pType).Scan(&count)
+	return count, err
+}
+
+// ── CS2 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *ChannelStore) CountAll(ctx context.Context) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, "SELECT COUNT(*) FROM channels").Scan(&count)
+	return count, err
+}
+
+// ── Workflow instance state (v0.29.0-cs3) ───────────────────────────────
+
+func (s *ChannelStore) SetWorkflowInstance(ctx context.Context, channelID, workflowID string, version int, stageData json.RawMessage, status string) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE channels
+		SET workflow_id = ?, workflow_version = ?, current_stage = 0,
+		    stage_data = ?, workflow_status = ?, last_activity_at = ?
+		WHERE id = ?
+	`, workflowID, version, stageData, status, time.Now().UTC().Format(timeFmt), channelID)
+	return err
+}
+
+func (s *ChannelStore) GetWorkflowStatus(ctx context.Context, channelID string) (*store.WorkflowChannelStatus, error) {
+	var ws store.WorkflowChannelStatus
+	var stageData []byte
+	err := DB.QueryRowContext(ctx, `
+		SELECT workflow_id, workflow_version, current_stage,
+		       COALESCE(stage_data, '{}'), COALESCE(workflow_status, 'active'),
+		       last_activity_at
+		FROM channels WHERE id = ? AND type = 'workflow'
+	`, channelID).Scan(&ws.WorkflowID, &ws.WorkflowVersion,
+		&ws.CurrentStage, &stageData, &ws.Status, &ws.LastActivityAt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	ws.StageData = stageData
+	return &ws, nil
+}
+
+func (s *ChannelStore) AdvanceWorkflowStage(ctx context.Context, channelID string, nextStage int, stageData json.RawMessage) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE channels
+		SET current_stage = ?, stage_data = ?, last_activity_at = ?
+		WHERE id = ?
+	`, nextStage, stageData, time.Now().UTC().Format(timeFmt), channelID)
+	return err
+}
+
+func (s *ChannelStore) CompleteWorkflow(ctx context.Context, channelID string, finalStage int, stageData json.RawMessage) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE channels
+		SET current_stage = ?, workflow_status = 'completed',
+		    stage_data = ?, last_activity_at = ?, ai_mode = 'off'
+		WHERE id = ?
+	`, finalStage, stageData, time.Now().UTC().Format(timeFmt), channelID)
+	return err
+}
+
+func (s *ChannelStore) RejectWorkflowToStage(ctx context.Context, channelID string, stage int) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE channels SET current_stage = ?, last_activity_at = ? WHERE id = ?
+	`, stage, time.Now().UTC().Format(timeFmt), channelID)
+	return err
+}
+
+func (s *ChannelStore) GetStageData(ctx context.Context, channelID string) (json.RawMessage, error) {
+	var data json.RawMessage
+	err := DB.QueryRowContext(ctx, `
+		SELECT COALESCE(stage_data, '{}') FROM channels WHERE id = ?
+	`, channelID).Scan(&data)
+	return data, err
+}
+
+// ── Background job helpers (v0.29.0-cs4) ────────────────────────────────
+
+func (s *ChannelStore) MarkStaleWorkflows(ctx context.Context, cutoff time.Time) (int64, error) {
+	result, err := DB.ExecContext(ctx, `
+		UPDATE channels
+		SET workflow_status = 'stale'
+		WHERE type = 'workflow'
+		  AND workflow_status = 'active'
+		  AND last_activity_at < ?
+	`, cutoff.Format(timeFmt))
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+func (s *ChannelStore) EnforceWorkflowRetention(ctx context.Context) (int64, error) {
+	// SQLite doesn't support JSON operators for retention policy evaluation.
+	// This is a no-op on SQLite; retention enforcement is PG-only.
+	return 0, nil
+}
+
+func (s *ChannelStore) GetTypeAndAllowAnonymous(ctx context.Context, channelID string) (string, bool, error) {
+	var chType string
+	var allowAnon bool
+	err := DB.QueryRowContext(ctx,
+		`SELECT type, allow_anonymous FROM channels WHERE id = ?`, channelID).Scan(&chType, &allowAnon)
+	return chType, allowAnon, err
+}
+
+// ── CS5b additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *ChannelStore) FindCompactionCandidates(ctx context.Context, activityBefore, createdAfter time.Time, minMessages, minChars, limit int) ([]models.Channel, error) {
+	// Auto-compaction scanner is PG-only (uses settings::text cast).
+	return []models.Channel{}, nil
+}
+
+// ── CS7a additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *ChannelStore) GetProviderConfigID(ctx context.Context, channelID string) (*string, error) {
+	var configID sql.NullString
+	err := DB.QueryRowContext(ctx,
+		`SELECT provider_config_id FROM channels WHERE id = ?`, channelID).Scan(&configID)
+	if err != nil {
+		return nil, err
+	}
+	return NullableStringPtr(configID), nil
+}
+
+func (s *ChannelStore) UserCanAccess(ctx context.Context, channelID, userID string) (bool, error) {
+	var ok bool
+	err := DB.QueryRowContext(ctx, `
+		SELECT EXISTS(
+			SELECT 1 FROM channels WHERE id = ? AND user_id = ?
+			UNION ALL
+			SELECT 1 FROM channel_participants
+			WHERE channel_id = ? AND participant_type = 'user' AND participant_id = ?
+			LIMIT 1
+		)`, channelID, userID, channelID, userID).Scan(&ok)
+	return ok, err
+}
+
+// ── CS7b additions (v0.29.0) ────────────────────────────────────────────
+
+const channelListCols = `c.id, c.user_id, c.title, c.type, c.ai_mode, c.topic,
+	c.description, c.model, c.provider_config_id,
+	c.system_prompt, c.is_archived, c.is_pinned, c.folder, c.folder_id, c.project_id, c.workspace_id,
+	c.tags, c.settings,
+	COALESCE(mc.cnt, 0) AS message_count,
+	c.created_at, c.updated_at`
+
+const channelListFrom = `channels c
+	LEFT JOIN (
+		SELECT channel_id, COUNT(*) AS cnt FROM messages WHERE deleted_at IS NULL GROUP BY channel_id
+	) mc ON mc.channel_id = c.id`
+
+func (s *ChannelStore) ListFiltered(ctx context.Context, userID string, f store.ChannelListFilter) ([]store.ChannelListItem, int, error) {
+	b := NewSelect(channelListCols, channelListFrom)
+	b.Where("(c.user_id = ? OR c.id IN (SELECT channel_id FROM channel_participants WHERE participant_type = 'user' AND participant_id = ?))", userID, userID)
+	archivedVal := 0
+	if f.Archived {
+		archivedVal = 1
+	}
+	b.Where("c.is_archived = ?", archivedVal)
+
+	if len(f.Types) == 1 {
+		b.Where("c.type = ?", f.Types[0])
+	} else if len(f.Types) > 1 {
+		placeholders := make([]string, len(f.Types))
+		for i, t := range f.Types {
+			placeholders[i] = "?"
+			b.args = append(b.args, t)
+		}
+		b.WhereRaw("c.type IN (" + strings.Join(placeholders, ",") + ")")
+	}
+	if f.Folder != "" {
+		b.Where("c.folder = ?", f.Folder)
+	}
+	if f.FolderID != "" {
+		b.Where("c.folder_id = ?", f.FolderID)
+	}
+	if f.Search != "" {
+		b.Where("c.title LIKE ?", "%"+f.Search+"%")
+	}
+	if f.ProjectID == "none" {
+		b.WhereRaw("c.project_id IS NULL")
+	} else if f.ProjectID != "" {
+		b.Where("c.project_id = ?", f.ProjectID)
+	}
+
+	// Count
+	countQ, countArgs := b.CountBuild()
+	var total int
+	DB.QueryRowContext(ctx, countQ, countArgs...).Scan(&total)
+
+	b.OrderBy("c.is_pinned DESC, c.updated_at", "DESC")
+	b.Paginate(f.ListOptions)
+
+	q, args := b.Build()
+	rows, err := DB.QueryContext(ctx, q, args...)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+
+	items, err := scanChannelListItems(rows)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	// Compute unread counts
+	for i := range items {
+		DB.QueryRowContext(ctx, `
+			SELECT COUNT(*) FROM messages m
+			JOIN channel_participants cp ON cp.channel_id = m.channel_id
+			WHERE cp.channel_id = ?
+			  AND cp.participant_type = 'user' AND cp.participant_id = ?
+			  AND m.created_at > cp.last_read_at
+			  AND m.deleted_at IS NULL
+		`, items[i].ID, userID).Scan(&items[i].UnreadCount)
+	}
+
+	return items, total, nil
+}
+
+func (s *ChannelStore) GetForUser(ctx context.Context, channelID, userID string) (*store.ChannelListItem, error) {
+	row := DB.QueryRowContext(ctx, fmt.Sprintf(`
+		SELECT %s FROM %s
+		WHERE c.id = ? AND (c.user_id = ? OR c.id IN (
+			SELECT channel_id FROM channel_participants WHERE participant_type = 'user' AND participant_id = ?
+		))
+	`, channelListCols, channelListFrom), channelID, userID, userID)
+
+	var item store.ChannelListItem
+	var tags, settings string
+	err := row.Scan(
+		&item.ID, &item.UserID, &item.Title, &item.Type, &item.AiMode, &item.Topic,
+		&item.Description, &item.Model, &item.ProviderConfigID,
+		&item.SystemPrompt, &item.IsArchived, &item.IsPinned, &item.Folder, &item.FolderID, &item.ProjectID, &item.WorkspaceID,
+		&tags, &settings,
+		&item.MessageCount, st(&item.CreatedAtTime), st(&item.UpdatedAtTime),
+	)
+	if err != nil {
+		return nil, err
+	}
+	item.Tags = ScanArray(tags)
+	if item.Tags == nil {
+		item.Tags = []string{}
+	}
+	item.Settings = safeJSONString(settings)
+	item.CreatedAt = item.CreatedAtTime.Format("2006-01-02T15:04:05Z")
+	item.UpdatedAt = item.UpdatedAtTime.Format("2006-01-02T15:04:05Z")
+	return &item, nil
+}
+
+func (s *ChannelStore) CreateFull(ctx context.Context, ch *models.Channel, folder string, tags []string, aiMode string,
+	ownerUserID string, dmPartnerIDs []string, defaultModel, defaultConfigID string) error {
+	ch.ID = store.NewID()
+	now := time.Now().UTC()
+	ch.CreatedAt = now
+	ch.UpdatedAt = now
+
+	if tags == nil {
+		tags = []string{}
+	}
+
+	tx, err := DB.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	tagsJSON := ArrayToJSON(tags)
+	_, err = tx.ExecContext(ctx, `
+		INSERT INTO channels (id, user_id, title, type, description, model, system_prompt,
+			provider_config_id, folder, folder_id, tags, ai_mode, created_at, updated_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		ch.ID, ch.UserID, ch.Title, ch.Type, ch.Description, ch.Model, ch.SystemPrompt,
+		models.NullString(ch.ProviderConfigID), folder, models.NullString(ch.FolderID),
+		tagsJSON, aiMode, now.Format(timeFmt), now.Format(timeFmt),
+	)
+	if err != nil {
+		return fmt.Errorf("CreateFull insert channel: %w", err)
+	}
+
+	// Add owner participant
+	_, _ = tx.ExecContext(ctx, `
+		INSERT INTO channel_participants (id, channel_id, participant_type, participant_id, role)
+		VALUES (?, ?, 'user', ?, 'owner')
+		ON CONFLICT DO NOTHING`, store.NewID(), ch.ID, ownerUserID)
+
+	// Add DM partner participants
+	for _, pid := range dmPartnerIDs {
+		if pid == ownerUserID {
+			continue
+		}
+		_, _ = tx.ExecContext(ctx, `
+			INSERT INTO channel_participants (id, channel_id, participant_type, participant_id, role)
+			VALUES (?, ?, 'user', ?, 'member')
+			ON CONFLICT DO NOTHING`, store.NewID(), ch.ID, pid)
+	}
+
+	// Auto-create channel_model if model specified
+	if defaultModel != "" {
+		_, _ = tx.ExecContext(ctx, `
+			INSERT INTO channel_models (id, channel_id, model_id, provider_config_id, is_default)
+			VALUES (?, ?, ?, ?, 1)
+			ON CONFLICT DO NOTHING`, store.NewID(), ch.ID, defaultModel, models.NullString(&defaultConfigID))
+	}
+
+	return tx.Commit()
+}
+
+func (s *ChannelStore) MergeSettings(ctx context.Context, channelID string, settingsJSON json.RawMessage) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE channels SET settings = json_patch(COALESCE(settings, '{}'), ?) WHERE id = ?`,
+		string(settingsJSON), channelID)
+	return err
+}
+
+// ── CS7b helpers ────────────────────────────
+
+func scanChannelListItems(rows *sql.Rows) ([]store.ChannelListItem, error) {
+	var result []store.ChannelListItem
+	for rows.Next() {
+		var item store.ChannelListItem
+		var tags, settings string
+		err := rows.Scan(
+			&item.ID, &item.UserID, &item.Title, &item.Type, &item.AiMode, &item.Topic,
+			&item.Description, &item.Model, &item.ProviderConfigID,
+			&item.SystemPrompt, &item.IsArchived, &item.IsPinned, &item.Folder, &item.FolderID, &item.ProjectID, &item.WorkspaceID,
+			&tags, &settings,
+			&item.MessageCount, st(&item.CreatedAtTime), st(&item.UpdatedAtTime),
+		)
+		if err != nil {
+			return nil, err
+		}
+		item.Tags = ScanArray(tags)
+		if item.Tags == nil {
+			item.Tags = []string{}
+		}
+		item.Settings = safeJSONString(settings)
+		item.CreatedAt = item.CreatedAtTime.Format("2006-01-02T15:04:05Z")
+		item.UpdatedAt = item.UpdatedAtTime.Format("2006-01-02T15:04:05Z")
+		result = append(result, item)
+	}
+	return result, rows.Err()
+}
+
+func safeJSONString(s string) json.RawMessage {
+	if s == "" || s == "null" {
+		return json.RawMessage("{}")
+	}
+	return json.RawMessage(s)
+}

server/store/sqlite/channel_helpers.go

@@ -0,0 +1,143 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+)
+
+// ── Single-field helpers (v0.29.0) ──────────────────────────────────────
+
+func (s *ChannelStore) GetAIMode(ctx context.Context, channelID string) (string, error) {
+	var aiMode string
+	err := DB.QueryRowContext(ctx, `
+		SELECT COALESCE(ai_mode, 'auto') FROM channels WHERE id = ?
+	`, channelID).Scan(&aiMode)
+	if err != nil {
+		return "auto", err
+	}
+	return aiMode, nil
+}
+
+func (s *ChannelStore) GetTypeAndTeamID(ctx context.Context, channelID string) (string, *string, error) {
+	var channelType string
+	var teamID *string
+	err := DB.QueryRowContext(ctx, `
+		SELECT COALESCE(type, 'direct'), team_id FROM channels WHERE id = ?
+	`, channelID).Scan(&channelType, &teamID)
+	return channelType, teamID, err
+}
+
+func (s *ChannelStore) GetSystemPrompt(ctx context.Context, channelID string) (*string, error) {
+	var prompt *string
+	err := DB.QueryRowContext(ctx, `
+		SELECT system_prompt FROM channels WHERE id = ?
+	`, channelID).Scan(&prompt)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return prompt, err
+}
+
+func (s *ChannelStore) GetDefaultModel(ctx context.Context, channelID string) (*string, error) {
+	var model *string
+	err := DB.QueryRowContext(ctx, `
+		SELECT model FROM channels WHERE id = ?
+	`, channelID).Scan(&model)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return model, err
+}
+
+func (s *ChannelStore) TouchUpdatedAt(ctx context.Context, channelID string) error {
+	_, err := DB.ExecContext(ctx, `UPDATE channels SET updated_at = datetime('now') WHERE id = ?`, channelID)
+	return err
+}
+
+func (s *ChannelStore) ListUserParticipantIDs(ctx context.Context, channelID, excludeUserID string) ([]string, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT participant_id FROM channel_participants
+		WHERE channel_id = ? AND participant_type = 'user' AND participant_id != ?
+	`, channelID, excludeUserID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var ids []string
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	if ids == nil {
+		ids = []string{}
+	}
+	return ids, rows.Err()
+}
+
+func (s *ChannelStore) ListPersonaParticipantIDs(ctx context.Context, channelID string) ([]string, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT participant_id FROM channel_participants
+		WHERE channel_id = ? AND participant_type = 'persona'
+		ORDER BY created_at
+	`, channelID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var ids []string
+	for rows.Next() {
+		var id string
+		if err := rows.Scan(&id); err != nil {
+			return nil, err
+		}
+		ids = append(ids, id)
+	}
+	if ids == nil {
+		ids = []string{}
+	}
+	return ids, rows.Err()
+}
+
+func (s *ChannelStore) GetLeaderPersonaID(ctx context.Context, channelID string) (string, error) {
+	var leaderID string
+	err := DB.QueryRowContext(ctx, `
+		SELECT cp.participant_id
+		FROM channel_participants cp
+		JOIN persona_group_members pgm ON pgm.persona_id = cp.participant_id
+		WHERE cp.channel_id = ?
+		  AND cp.participant_type = 'persona'
+		  AND pgm.is_leader = 1
+		LIMIT 1
+	`, channelID).Scan(&leaderID)
+	if err == nil && leaderID != "" {
+		return leaderID, nil
+	}
+
+	err = DB.QueryRowContext(ctx, `
+		SELECT participant_id FROM channel_participants
+		WHERE channel_id = ? AND participant_type = 'persona'
+		ORDER BY created_at LIMIT 1
+	`, channelID).Scan(&leaderID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return leaderID, err
+}
+
+func (s *ChannelStore) GetWorkflowInfo(ctx context.Context, channelID string) (*string, int, error) {
+	var workflowID *string
+	var currentStage int
+	err := DB.QueryRowContext(ctx, `
+		SELECT workflow_id, COALESCE(current_stage, 0)
+		FROM channels WHERE id = ? AND type = 'workflow'
+	`, channelID).Scan(&workflowID, &currentStage)
+	if err == sql.ErrNoRows {
+		return nil, 0, nil
+	}
+	return workflowID, currentStage, err
+}

server/store/sqlite/extension_permissions.go

@@ -0,0 +1,164 @@
+package sqlite
+
+import (
+	"context"
+	"time"
+
+	"github.com/google/uuid"
+
+	"git.gobha.me/xcaliber/chat-switchboard/database"
+	"git.gobha.me/xcaliber/chat-switchboard/models"
+)
+
+type ExtensionPermissionStore struct{}
+
+func NewExtensionPermissionStore() *ExtensionPermissionStore {
+	return &ExtensionPermissionStore{}
+}
+
+func (s *ExtensionPermissionStore) DeclareForPackage(ctx context.Context, packageID string, permissions []string) error {
+	tx, err := DB.BeginTx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	if len(permissions) == 0 {
+		_, err = tx.ExecContext(ctx, `DELETE FROM extension_permissions WHERE package_id = ?`, packageID)
+		if err != nil {
+			return err
+		}
+		return tx.Commit()
+	}
+
+	declared := make(map[string]bool, len(permissions))
+	for _, p := range permissions {
+		declared[p] = true
+	}
+
+	rows, err := tx.QueryContext(ctx,
+		`SELECT permission FROM extension_permissions WHERE package_id = ?`, packageID)
+	if err != nil {
+		return err
+	}
+	existing := make(map[string]bool)
+	for rows.Next() {
+		var perm string
+		if err := rows.Scan(&perm); err != nil {
+			rows.Close()
+			return err
+		}
+		existing[perm] = true
+	}
+	rows.Close()
+
+	for perm := range existing {
+		if !declared[perm] {
+			_, err = tx.ExecContext(ctx,
+				`DELETE FROM extension_permissions WHERE package_id = ? AND permission = ?`,
+				packageID, perm)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	for _, perm := range permissions {
+		if !existing[perm] {
+			_, err = tx.ExecContext(ctx,
+				`INSERT OR IGNORE INTO extension_permissions (id, package_id, permission)
+				 VALUES (?, ?, ?)`,
+				uuid.New().String(), packageID, perm)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	return tx.Commit()
+}
+
+func (s *ExtensionPermissionStore) ListForPackage(ctx context.Context, packageID string) ([]models.ExtensionPermission, error) {
+	rows, err := DB.QueryContext(ctx,
+		`SELECT id, package_id, permission, granted, granted_by, granted_at, created_at
+		 FROM extension_permissions
+		 WHERE package_id = ?
+		 ORDER BY permission`, packageID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var perms []models.ExtensionPermission
+	for rows.Next() {
+		var p models.ExtensionPermission
+		if err := rows.Scan(&p.ID, &p.PackageID, &p.Permission, &p.Granted,
+			&p.GrantedBy, database.SNT(&p.GrantedAt), database.ST(&p.CreatedAt)); err != nil {
+			return nil, err
+		}
+		perms = append(perms, p)
+	}
+	if perms == nil {
+		perms = []models.ExtensionPermission{}
+	}
+	return perms, nil
+}
+
+func (s *ExtensionPermissionStore) GrantedForPackage(ctx context.Context, packageID string) ([]string, error) {
+	rows, err := DB.QueryContext(ctx,
+		`SELECT permission FROM extension_permissions
+		 WHERE package_id = ? AND granted = 1
+		 ORDER BY permission`, packageID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var perms []string
+	for rows.Next() {
+		var p string
+		if err := rows.Scan(&p); err != nil {
+			return nil, err
+		}
+		perms = append(perms, p)
+	}
+	if perms == nil {
+		perms = []string{}
+	}
+	return perms, nil
+}
+
+func (s *ExtensionPermissionStore) Grant(ctx context.Context, packageID, permission, grantedBy string) error {
+	now := time.Now().UTC().Format(time.RFC3339)
+	_, err := DB.ExecContext(ctx,
+		`UPDATE extension_permissions
+		 SET granted = 1, granted_by = ?, granted_at = ?
+		 WHERE package_id = ? AND permission = ?`,
+		grantedBy, now, packageID, permission)
+	return err
+}
+
+func (s *ExtensionPermissionStore) Revoke(ctx context.Context, packageID, permission string) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE extension_permissions
+		 SET granted = 0, granted_by = NULL, granted_at = NULL
+		 WHERE package_id = ? AND permission = ?`,
+		packageID, permission)
+	return err
+}
+
+func (s *ExtensionPermissionStore) GrantAll(ctx context.Context, packageID, grantedBy string) error {
+	now := time.Now().UTC().Format(time.RFC3339)
+	_, err := DB.ExecContext(ctx,
+		`UPDATE extension_permissions
+		 SET granted = 1, granted_by = ?, granted_at = ?
+		 WHERE package_id = ? AND granted = 0`,
+		grantedBy, now, packageID)
+	return err
+}
+
+func (s *ExtensionPermissionStore) DeleteForPackage(ctx context.Context, packageID string) error {
+	_, err := DB.ExecContext(ctx,
+		`DELETE FROM extension_permissions WHERE package_id = ?`, packageID)
+	return err
+}

server/store/sqlite/file.go

@@ -254,3 +254,12 @@ func (s *FileStore) ListOrphans(ctx context.Context, olderThan time.Duration) ([
 	}
 	return out, rows.Err()
 }
+
+// ── CS5c additions (v0.29.0) ──────────────────────────────────────────
+
+func (s *FileStore) UpdateStorageKey(ctx context.Context, id, key string) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE files SET storage_key = ?, updated_at = datetime('now') WHERE id = ?`,
+		key, id)
+	return err
+}

server/store/sqlite/folder.go

@@ -0,0 +1,82 @@
+package sqlite
+
+import (
+	"context"
+
+	"git.gobha.me/xcaliber/chat-switchboard/models"
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+type FolderStore struct{}
+
+func NewFolderStore() *FolderStore { return &FolderStore{} }
+
+func (s *FolderStore) List(ctx context.Context, userID string) ([]models.Folder, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT id, name, parent_id, sort_order, created_at, updated_at
+		FROM folders WHERE user_id = ?
+		ORDER BY sort_order, name
+	`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var result []models.Folder
+	for rows.Next() {
+		var f models.Folder
+		if err := rows.Scan(&f.ID, &f.Name, &f.ParentID, &f.SortOrder,
+			st(&f.CreatedAt), st(&f.UpdatedAt)); err != nil {
+			continue
+		}
+		f.UserID = userID
+		result = append(result, f)
+	}
+	if result == nil {
+		result = []models.Folder{}
+	}
+	return result, rows.Err()
+}
+
+func (s *FolderStore) Create(ctx context.Context, f *models.Folder) error {
+	f.ID = store.NewID()
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO folders (id, user_id, name, sort_order)
+		VALUES (?, ?, ?, ?)
+	`, f.ID, f.UserID, f.Name, f.SortOrder)
+	if err != nil {
+		return err
+	}
+	return DB.QueryRowContext(ctx, `
+		SELECT name, parent_id, sort_order, created_at, updated_at
+		FROM folders WHERE id = ?
+	`, f.ID).Scan(&f.Name, &f.ParentID, &f.SortOrder, st(&f.CreatedAt), st(&f.UpdatedAt))
+}
+
+func (s *FolderStore) Update(ctx context.Context, folderID, userID string, name string, sortOrder *int) (int64, error) {
+	res, err := DB.ExecContext(ctx, `
+		UPDATE folders
+		SET name       = COALESCE(NULLIF(?, ''), name),
+		    sort_order = COALESCE(?, sort_order)
+		WHERE id = ? AND user_id = ?
+	`, name, sortOrder, folderID, userID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *FolderStore) Delete(ctx context.Context, folderID, userID string) (int64, error) {
+	res, err := DB.ExecContext(ctx,
+		`DELETE FROM folders WHERE id = ? AND user_id = ?`, folderID, userID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *FolderStore) UnassignChannels(ctx context.Context, folderID, userID string) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE channels SET folder_id = NULL WHERE folder_id = ? AND user_id = ?`, folderID, userID)
+	return err
+}

server/store/sqlite/global_config.go

@@ -56,3 +56,39 @@ func (s *GlobalConfigStore) GetAll(ctx context.Context) (map[string]models.JSONM
 	}
 	return result, rows.Err()
 }
+
+// ── OIDC state (v0.29.0-cs4) ────────────────────────────────────────────
+
+func (s *GlobalConfigStore) SaveOIDCState(ctx context.Context, state, nonce, redirectTo string) error {
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO oidc_auth_state (state, nonce, redirect_to) VALUES (?, ?, ?)
+	`, state, nonce, redirectTo)
+	return err
+}
+
+func (s *GlobalConfigStore) ConsumeOIDCState(ctx context.Context, state string) (string, string, error) {
+	var nonce, redirectTo string
+	err := DB.QueryRowContext(ctx, `
+		SELECT nonce, COALESCE(redirect_to, '') FROM oidc_auth_state WHERE state = ?
+	`, state).Scan(&nonce, &redirectTo)
+	if err != nil {
+		return "", "", err
+	}
+	_, _ = DB.ExecContext(ctx, `DELETE FROM oidc_auth_state WHERE state = ?`, state)
+	return nonce, redirectTo, nil
+}
+
+func (s *GlobalConfigStore) CleanupOIDCState(ctx context.Context) error {
+	_, err := DB.ExecContext(ctx,
+		`DELETE FROM oidc_auth_state WHERE created_at < datetime('now', '-10 minutes')`)
+	return err
+}
+
+// ── CS6 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *GlobalConfigStore) GetString(ctx context.Context, key string) (string, error) {
+	var val string
+	err := DB.QueryRowContext(ctx,
+		"SELECT value FROM global_settings WHERE key = ?", key).Scan(&val)
+	return val, err
+}

server/store/sqlite/memory.go

@@ -254,3 +254,34 @@ func (s *MemoryStore) scanMemories(rows *sql.Rows) ([]models.Memory, error) {
 
 // ensure compile-time interface satisfaction
 var _ store.MemoryStore = (*MemoryStore)(nil)
+
+// ── CS5b additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *MemoryStore) SetEmbedding(ctx context.Context, id, embedding string) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE memories SET embedding = ? WHERE id = ?`, embedding, id)
+	return err
+}
+
+func (s *MemoryStore) GetLastExtractionMessageID(ctx context.Context, channelID, userID string) (string, error) {
+	var lastID string
+	err := DB.QueryRowContext(ctx,
+		`SELECT last_message_id FROM memory_extraction_log WHERE channel_id = ? AND user_id = ?`,
+		channelID, userID).Scan(&lastID)
+	if err != nil {
+		return "", nil
+	}
+	return lastID, nil
+}
+
+func (s *MemoryStore) UpsertExtractionLog(ctx context.Context, channelID, userID, lastMessageID string, count int) error {
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO memory_extraction_log (id, channel_id, user_id, last_message_id, memory_count)
+		VALUES (?, ?, ?, ?, ?)
+		ON CONFLICT(channel_id, user_id) DO UPDATE SET
+			last_message_id = excluded.last_message_id,
+			extracted_at = datetime('now'),
+			memory_count = memory_extraction_log.memory_count + excluded.memory_count
+	`, store.NewID(), channelID, userID, lastMessageID, count)
+	return err
+}

server/store/sqlite/message.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"strings"
 	"time"
 
 	"git.gobha.me/xcaliber/chat-switchboard/models"
@@ -137,7 +138,9 @@ func (s *MessageStore) GetPathToRoot(ctx context.Context, messageID string) ([]m
 				m.parent_id, m.sibling_index, m.participant_type, m.participant_id, m.deleted_at, m.created_at
 			FROM messages m JOIN path p ON m.id = p.parent_id
 		)
-		SELECT * FROM path ORDER BY created_at ASC`, messageID)
+		SELECT id, channel_id, role, content, model, tokens_used, tool_calls, metadata,
+			parent_id, sibling_index, participant_type, participant_id, deleted_at, created_at
+		FROM path ORDER BY created_at ASC`, messageID)
 	if err != nil {
 		return nil, err
 	}
@@ -188,3 +191,120 @@ func scanMessages(rows *sql.Rows) ([]models.Message, error) {
 	}
 	return result, rows.Err()
 }
+
+// ── CS2 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *MessageStore) CountAll(ctx context.Context) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, "SELECT COUNT(*) FROM messages").Scan(&count)
+	return count, err
+}
+
+// ── CS5c additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *MessageStore) SearchInChannel(ctx context.Context, channelID, query, roleFilter string, limit int) ([]store.ChannelSearchResult, error) {
+	words := strings.Fields(query)
+	if len(words) == 0 {
+		return []store.ChannelSearchResult{}, nil
+	}
+
+	q := `SELECT m.id, m.role, SUBSTR(m.content, 1, 300), m.created_at
+	      FROM messages m
+	      WHERE m.channel_id = ?
+	        AND m.deleted_at IS NULL
+	        AND m.role IN ('user', 'assistant')`
+	args := []interface{}{channelID}
+
+	if roleFilter == "user" || roleFilter == "assistant" {
+		q += " AND m.role = ?"
+		args = append(args, roleFilter)
+	}
+
+	for _, w := range words {
+		q += " AND m.content LIKE ?"
+		args = append(args, "%"+w+"%")
+	}
+
+	q += " ORDER BY m.created_at DESC LIMIT ?"
+	args = append(args, limit)
+
+	rows, err := DB.QueryContext(ctx, q, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	results := make([]store.ChannelSearchResult, 0)
+	for rows.Next() {
+		var r store.ChannelSearchResult
+		if err := rows.Scan(&r.MessageID, &r.Role, &r.Excerpt, st(&r.Timestamp)); err != nil {
+			continue
+		}
+		r.Rank = 1.0 // no ranking on SQLite
+		results = append(results, r)
+	}
+	return results, rows.Err()
+}
+
+// ── CS7a additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *MessageStore) ListWithSenderInfo(ctx context.Context, channelID string, limit, offset int) ([]store.MessageWithSender, int, error) {
+	var total int
+	err := DB.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM messages WHERE channel_id = ? AND deleted_at IS NULL`,
+		channelID).Scan(&total)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	rows, err := DB.QueryContext(ctx, `
+		SELECT m.id, m.channel_id, m.role, m.content, m.model, m.tokens_used, m.parent_id,
+		       m.sibling_index, m.participant_type, m.participant_id,
+		       CASE WHEN m.participant_type = 'user' THEN COALESCE(u.display_name, u.username)
+		            WHEN m.participant_type = 'persona' THEN p.name
+		            ELSE NULL END AS sender_name,
+		       CASE WHEN m.participant_type = 'user' THEN u.avatar_url
+		            WHEN m.participant_type = 'persona' THEN p.avatar
+		            ELSE NULL END AS sender_avatar,
+		       m.created_at
+		FROM messages m
+		LEFT JOIN users u ON m.participant_type = 'user' AND m.participant_id = u.id
+		LEFT JOIN personas p ON m.participant_type = 'persona' AND m.participant_id = p.id
+		WHERE m.channel_id = ? AND m.deleted_at IS NULL
+		ORDER BY m.created_at ASC
+		LIMIT ? OFFSET ?
+	`, channelID, limit, offset)
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+
+	results := make([]store.MessageWithSender, 0)
+	for rows.Next() {
+		var m store.MessageWithSender
+		if err := rows.Scan(
+			&m.ID, &m.ChannelID, &m.Role, &m.Content,
+			&m.Model, &m.TokensUsed, &m.ParentID,
+			&m.SiblingIndex, &m.ParticipantType, &m.ParticipantID,
+			&m.SenderName, &m.SenderAvatar,
+			&m.CreatedAt,
+		); err != nil {
+			return nil, total, err
+		}
+		results = append(results, m)
+	}
+	return results, total, rows.Err()
+}
+
+func (s *MessageStore) GetParentAndRole(ctx context.Context, messageID, channelID string) (*string, string, error) {
+	var parentID sql.NullString
+	var role string
+	err := DB.QueryRowContext(ctx, `
+		SELECT parent_id, role FROM messages
+		WHERE id = ? AND channel_id = ? AND deleted_at IS NULL
+	`, messageID, channelID).Scan(&parentID, &role)
+	if err != nil {
+		return nil, "", err
+	}
+	return NullableStringPtr(parentID), role, nil
+}

server/store/sqlite/message_tree.go

@@ -0,0 +1,382 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"git.gobha.me/xcaliber/chat-switchboard/models"
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+// ── Tree Operations (v0.29.0) ───────────────────────────────────────────
+
+func (s *MessageStore) GetActiveLeaf(ctx context.Context, channelID, userID string) (*string, error) {
+	var leafID *string
+
+	err := DB.QueryRowContext(ctx, `
+		SELECT active_leaf_id FROM channel_cursors
+		WHERE channel_id = ? AND user_id = ?
+	`, channelID, userID).Scan(&leafID)
+
+	if err == nil && leafID != nil {
+		var exists bool
+		DB.QueryRowContext(ctx, `
+			SELECT EXISTS(SELECT 1 FROM messages WHERE id = ? AND deleted_at IS NULL)
+		`, *leafID).Scan(&exists)
+		if exists {
+			return leafID, nil
+		}
+	}
+
+	var fallbackID string
+	err = DB.QueryRowContext(ctx, `
+		SELECT id FROM messages
+		WHERE channel_id = ? AND deleted_at IS NULL
+		ORDER BY created_at DESC LIMIT 1
+	`, channelID).Scan(&fallbackID)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &fallbackID, nil
+}
+
+func (s *MessageStore) GetPathToLeaf(ctx context.Context, channelID, leafID string) ([]store.PathMessage, error) {
+	rows, err := DB.QueryContext(ctx, `
+		WITH RECURSIVE path AS (
+			SELECT id, parent_id, role, content, model, tokens_used, tool_calls, metadata,
+			       participant_type, participant_id, sibling_index, created_at,
+			       0 AS depth
+			FROM messages
+			WHERE id = ? AND channel_id = ? AND deleted_at IS NULL
+
+			UNION ALL
+
+			SELECT m.id, m.parent_id, m.role, m.content, m.model, m.tokens_used, m.tool_calls, m.metadata,
+			       m.participant_type, m.participant_id, m.sibling_index, m.created_at,
+			       p.depth + 1
+			FROM messages m
+			JOIN path p ON m.id = p.parent_id
+			WHERE m.deleted_at IS NULL
+		)
+		SELECT id, parent_id, role, content, model, tokens_used, tool_calls, metadata,
+		       participant_type, participant_id, sibling_index, created_at
+		FROM path
+		ORDER BY depth DESC
+	`, leafID, channelID)
+	if err != nil {
+		return nil, fmt.Errorf("GetPathToLeaf: %w", err)
+	}
+	defer rows.Close()
+
+	var path []store.PathMessage
+	for rows.Next() {
+		var m store.PathMessage
+		var participantType, participantID sql.NullString
+		var toolCallsJSON, metadataJSON []byte
+		if err := rows.Scan(
+			&m.ID, &m.ParentID, &m.Role, &m.Content, &m.Model, &m.TokensUsed,
+			&toolCallsJSON, &metadataJSON,
+			&participantType, &participantID, &m.SiblingIndex, &m.CreatedAt,
+		); err != nil {
+			return nil, fmt.Errorf("GetPathToLeaf scan: %w", err)
+		}
+		if len(toolCallsJSON) > 0 && string(toolCallsJSON) != "null" {
+			raw := json.RawMessage(toolCallsJSON)
+			m.ToolCalls = &raw
+		}
+		if len(metadataJSON) > 0 && string(metadataJSON) != "null" && string(metadataJSON) != "{}" {
+			raw := json.RawMessage(metadataJSON)
+			m.Metadata = &raw
+		}
+		if participantType.Valid {
+			m.ParticipantType = participantType.String
+		}
+		if participantID.Valid {
+			m.ParticipantID = participantID.String
+		}
+		path = append(path, m)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	for i := range path {
+		count, _ := s.GetSiblingCount(ctx, channelID, path[i].ParentID)
+		path[i].SiblingCount = count
+	}
+
+	_ = s.ResolveSenderInfo(ctx, path)
+
+	return path, nil
+}
+
+func (s *MessageStore) GetActivePath(ctx context.Context, channelID, userID string) ([]store.PathMessage, error) {
+	leafID, err := s.GetActiveLeaf(ctx, channelID, userID)
+	if err != nil {
+		return nil, err
+	}
+	if leafID == nil {
+		return []store.PathMessage{}, nil
+	}
+	return s.GetPathToLeaf(ctx, channelID, *leafID)
+}
+
+func (s *MessageStore) GetSiblingsList(ctx context.Context, messageID string) ([]store.SiblingInfo, int, error) {
+	var parentID *string
+	var channelID string
+	err := DB.QueryRowContext(ctx, `
+		SELECT parent_id, channel_id FROM messages
+		WHERE id = ? AND deleted_at IS NULL
+	`, messageID).Scan(&parentID, &channelID)
+	if err != nil {
+		return nil, 0, fmt.Errorf("message not found: %w", err)
+	}
+
+	var rows *sql.Rows
+	if parentID == nil {
+		rows, err = DB.QueryContext(ctx, `
+			SELECT id, role, model, sibling_index, SUBSTR(content, 1, 80), created_at
+			FROM messages
+			WHERE channel_id = ? AND parent_id IS NULL AND deleted_at IS NULL
+			ORDER BY sibling_index, created_at
+		`, channelID)
+	} else {
+		rows, err = DB.QueryContext(ctx, `
+			SELECT id, role, model, sibling_index, SUBSTR(content, 1, 80), created_at
+			FROM messages
+			WHERE parent_id = ? AND deleted_at IS NULL
+			ORDER BY sibling_index, created_at
+		`, *parentID)
+	}
+	if err != nil {
+		return nil, 0, err
+	}
+	defer rows.Close()
+
+	var siblings []store.SiblingInfo
+	currentIdx := 0
+	for i := 0; rows.Next(); i++ {
+		var si store.SiblingInfo
+		if err := rows.Scan(&si.ID, &si.Role, &si.Model, &si.SiblingIndex, &si.Preview, &si.CreatedAt); err != nil {
+			return nil, 0, err
+		}
+		if si.ID == messageID {
+			currentIdx = i
+		}
+		siblings = append(siblings, si)
+	}
+
+	return siblings, currentIdx, rows.Err()
+}
+
+func (s *MessageStore) GetSiblingCount(ctx context.Context, channelID string, parentID *string) (int, error) {
+	var count int
+	var err error
+	if parentID == nil {
+		err = DB.QueryRowContext(ctx, `
+			SELECT COUNT(*) FROM messages
+			WHERE channel_id = ? AND parent_id IS NULL AND deleted_at IS NULL
+		`, channelID).Scan(&count)
+	} else {
+		err = DB.QueryRowContext(ctx, `
+			SELECT COUNT(*) FROM messages
+			WHERE parent_id = ? AND deleted_at IS NULL
+		`, *parentID).Scan(&count)
+	}
+	if err != nil || count == 0 {
+		return 1, nil
+	}
+	return count, nil
+}
+
+func (s *MessageStore) FindLeafFromMessage(ctx context.Context, messageID string) (string, error) {
+	var leafID string
+	err := DB.QueryRowContext(ctx, `
+		WITH RECURSIVE descendants AS (
+			SELECT id, 0 AS depth
+			FROM messages
+			WHERE id = ? AND deleted_at IS NULL
+
+			UNION ALL
+
+			SELECT child.id, d.depth + 1
+			FROM messages child
+			JOIN descendants d ON child.parent_id = d.id
+			WHERE child.deleted_at IS NULL
+			  AND child.sibling_index = (
+			      SELECT MIN(sibling_index) FROM messages
+			      WHERE parent_id = d.id AND deleted_at IS NULL
+			  )
+		)
+		SELECT id FROM descendants
+		ORDER BY depth DESC
+		LIMIT 1
+	`, messageID).Scan(&leafID)
+
+	if err != nil {
+		return messageID, nil
+	}
+	return leafID, nil
+}
+
+func (s *MessageStore) NextSiblingIndexForParent(ctx context.Context, channelID string, parentID *string) (int, error) {
+	var maxIdx sql.NullInt64
+	var err error
+	if parentID == nil {
+		err = DB.QueryRowContext(ctx, `
+			SELECT MAX(sibling_index) FROM messages
+			WHERE channel_id = ? AND parent_id IS NULL AND deleted_at IS NULL
+		`, channelID).Scan(&maxIdx)
+	} else {
+		err = DB.QueryRowContext(ctx, `
+			SELECT MAX(sibling_index) FROM messages
+			WHERE parent_id = ? AND deleted_at IS NULL
+		`, *parentID).Scan(&maxIdx)
+	}
+	if err != nil || !maxIdx.Valid {
+		return 0, nil
+	}
+	return int(maxIdx.Int64) + 1, nil
+}
+
+func (s *MessageStore) HasPersonaMessages(ctx context.Context, channelID string) (bool, error) {
+	var id string
+	err := DB.QueryRowContext(ctx, `
+		SELECT id FROM messages
+		WHERE channel_id = ? AND role = 'assistant' AND participant_type = 'persona'
+		LIMIT 1
+	`, channelID).Scan(&id)
+	return err == nil && id != "", nil
+}
+
+func (s *MessageStore) CreateWithCursor(ctx context.Context, m *models.Message, cursorUserID string) error {
+	m.ID = store.NewID()
+	now := time.Now().UTC()
+	m.CreatedAt = now
+
+	// tool_calls: serialize for SQLite
+	var tcVal interface{}
+	if m.ToolCalls != nil {
+		tcVal = ToJSON(m.ToolCalls)
+	}
+
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO messages (id, channel_id, role, content, model, tokens_used,
+		                      tool_calls, parent_id, participant_type, participant_id,
+		                      provider_config_id, sibling_index, created_at)
+		VALUES (?, ?, ?, ?, NULLIF(?, ''), ?, ?, ?, ?, ?, NULLIF(?, ''), ?, ?)
+	`, m.ID, m.ChannelID, m.Role, m.Content, safeModelStr(m.Model), m.TokensUsed,
+		tcVal, models.NullString(m.ParentID),
+		m.ParticipantType, m.ParticipantID,
+		safeStringPtr(m.ProviderConfigID), m.SiblingIndex,
+		now.Format(timeFmt),
+	)
+	if err != nil {
+		return fmt.Errorf("CreateWithCursor insert: %w", err)
+	}
+
+	// Update cursor
+	if cursorUserID != "" {
+		_, _ = DB.ExecContext(ctx, `
+			INSERT INTO channel_cursors (id, channel_id, user_id, active_leaf_id)
+			VALUES (?, ?, ?, ?)
+			ON CONFLICT (channel_id, user_id) DO UPDATE SET
+				active_leaf_id = excluded.active_leaf_id, updated_at = datetime('now')
+		`, store.NewID(), m.ChannelID, cursorUserID, m.ID)
+	}
+
+	// Touch channel
+	_, _ = DB.ExecContext(ctx, `UPDATE channels SET updated_at = datetime('now') WHERE id = ?`, m.ChannelID)
+
+	return nil
+}
+
+func (s *MessageStore) ResolveSenderInfo(ctx context.Context, path []store.PathMessage) error {
+	userIDs := map[string]bool{}
+	personaIDs := map[string]bool{}
+	for _, m := range path {
+		if m.ParticipantID == "" {
+			continue
+		}
+		switch m.ParticipantType {
+		case "user":
+			userIDs[m.ParticipantID] = true
+		case "persona":
+			personaIDs[m.ParticipantID] = true
+		}
+	}
+
+	userNames := map[string]string{}
+	userAvatars := map[string]string{}
+	for uid := range userIDs {
+		var name, avatar sql.NullString
+		_ = DB.QueryRowContext(ctx, `
+			SELECT COALESCE(display_name, username), avatar_url FROM users WHERE id = ?
+		`, uid).Scan(&name, &avatar)
+		if name.Valid {
+			userNames[uid] = name.String
+		}
+		if avatar.Valid {
+			userAvatars[uid] = avatar.String
+		}
+	}
+
+	personaNames := map[string]string{}
+	personaAvatars := map[string]string{}
+	for pid := range personaIDs {
+		var name, avatar sql.NullString
+		_ = DB.QueryRowContext(ctx, `
+			SELECT name, avatar FROM personas WHERE id = ?
+		`, pid).Scan(&name, &avatar)
+		if name.Valid {
+			personaNames[pid] = name.String
+		}
+		if avatar.Valid {
+			personaAvatars[pid] = avatar.String
+		}
+	}
+
+	for i := range path {
+		pid := path[i].ParticipantID
+		switch path[i].ParticipantType {
+		case "user":
+			if n, ok := userNames[pid]; ok {
+				path[i].SenderName = &n
+			}
+			if a, ok := userAvatars[pid]; ok && a != "" {
+				path[i].SenderAvatar = &a
+			}
+		case "persona":
+			if n, ok := personaNames[pid]; ok {
+				path[i].SenderName = &n
+			}
+			if a, ok := personaAvatars[pid]; ok && a != "" {
+				path[i].SenderAvatar = &a
+			}
+		}
+	}
+
+	return nil
+}
+
+// ── helpers ─────────────────────────────────
+
+func safeModelStr(m string) string {
+	if m == "" {
+		return ""
+	}
+	return m
+}
+
+func safeStringPtr(s *string) string {
+	if s == nil {
+		return ""
+	}
+	return *s
+}

server/store/sqlite/note.go

@@ -226,3 +226,80 @@ func (s *NoteStore) scanNotes(rows *sql.Rows, total int) ([]models.Note, int, er
 	}
 	return result, total, rows.Err()
 }
+
+// ── CS5c additions (v0.29.0) ──────────────────────────────────────────
+
+// SetEmbedding is a no-op on SQLite (pgvector is PG-only).
+func (s *NoteStore) SetEmbedding(ctx context.Context, noteID, vecStr string) error {
+	return nil
+}
+
+// SearchKeyword performs LIKE-based keyword search on SQLite.
+func (s *NoteStore) SearchKeyword(ctx context.Context, userID, query string, limit int) ([]store.NoteSearchResult, error) {
+	words := strings.Fields(query)
+	if len(words) == 0 {
+		return []store.NoteSearchResult{}, nil
+	}
+
+	q := `SELECT id, title, folder_path, tags, SUBSTR(content, 1, 500)
+	      FROM notes WHERE user_id = ?`
+	args := []interface{}{userID}
+
+	for _, w := range words {
+		pattern := "%" + w + "%"
+		q += " AND (title LIKE ? OR content LIKE ?)"
+		args = append(args, pattern, pattern)
+	}
+	q += " ORDER BY updated_at DESC LIMIT ?"
+	args = append(args, limit)
+
+	rows, err := DB.QueryContext(ctx, q, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	results := make([]store.NoteSearchResult, 0)
+	for rows.Next() {
+		var r store.NoteSearchResult
+		var tagsJSON string
+		if err := rows.Scan(&r.ID, &r.Title, &r.FolderPath, &tagsJSON, &r.Excerpt); err != nil {
+			continue
+		}
+		r.Tags = ScanArray(tagsJSON)
+		if r.Tags == nil {
+			r.Tags = []string{}
+		}
+		r.Rank = 1.0 // no ranking on SQLite
+		results = append(results, r)
+	}
+	return results, rows.Err()
+}
+
+// SearchSemantic returns empty results on SQLite (vector search requires PG).
+func (s *NoteStore) SearchSemantic(ctx context.Context, userID, vecStr string, limit int) ([]store.NoteSearchResult, error) {
+	return []store.NoteSearchResult{}, nil
+}
+
+func (s *NoteStore) ListFolders(ctx context.Context, userID string) ([]store.FolderInfo, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT DISTINCT folder_path, COUNT(*) AS count
+		FROM notes WHERE user_id = ?
+		GROUP BY folder_path
+		ORDER BY folder_path
+	`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	results := make([]store.FolderInfo, 0)
+	for rows.Next() {
+		var f store.FolderInfo
+		if err := rows.Scan(&f.Path, &f.Count); err != nil {
+			continue
+		}
+		results = append(results, f)
+	}
+	return results, rows.Err()
+}

server/store/sqlite/packages.go

@@ -55,6 +55,20 @@ func (s *PackageStore) SetEnabled(ctx context.Context, id string, enabled bool)
 	return nil
 }
 
+func (s *PackageStore) SetStatus(ctx context.Context, id string, status string) error {
+	result, err := DB.ExecContext(ctx,
+		`UPDATE packages SET status = ?, updated_at = datetime('now') WHERE id = ?`,
+		status, id)
+	if err != nil {
+		return err
+	}
+	affected, _ := result.RowsAffected()
+	if affected == 0 {
+		return sql.ErrNoRows
+	}
+	return nil
+}
+
 func (s *PackageStore) Delete(ctx context.Context, id string) error {
 	result, err := DB.ExecContext(ctx,
 		`DELETE FROM packages WHERE id = ? AND source != 'core'`, id)
@@ -92,15 +106,18 @@ func (s *PackageStore) ListEnabled(ctx context.Context) ([]string, error) {
 func (s *PackageStore) Create(ctx context.Context, pkg *store.PackageRegistration) error {
 	now := time.Now().UTC()
 	manifestJSON := ToJSON(pkg.Manifest)
+	if pkg.Status == "" {
+		pkg.Status = "active"
+	}
 	_, err := DB.ExecContext(ctx, `
 		INSERT INTO packages (id, title, type, version, description, author, tier,
-			is_system, scope, team_id, installed_by, manifest, enabled, source,
+			is_system, scope, team_id, installed_by, manifest, enabled, status, source,
 			installed_at, updated_at)
-		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`,
+		VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)`,
 		pkg.ID, pkg.Title, pkg.Type, pkg.Version, pkg.Description, pkg.Author,
 		pkg.Tier, pkg.IsSystem, pkg.Scope,
 		nullStrPtr(pkg.TeamID), nullStrPtr(pkg.InstalledBy),
-		manifestJSON, pkg.Enabled, pkg.Source,
+		manifestJSON, pkg.Enabled, pkg.Status, pkg.Source,
 		now.Format(timeFmt), now.Format(timeFmt),
 	)
 	if err != nil {
@@ -168,7 +185,7 @@ func (s *PackageStore) ListForUser(ctx context.Context, userID string) ([]store.
 			&up.ID, &up.Title, &up.Type, &up.Version, &up.Description,
 			&up.Author, &up.Tier, &isSystemInt, &up.Scope,
 			&teamID, &installedBy,
-			&manifestJSON, &enabledInt, &up.Source,
+			&manifestJSON, &enabledInt, &up.Status, &up.Source,
 			&up.InstalledAt, &up.UpdatedAt,
 			&userEnabled, &userSettings,
 		); err != nil {
@@ -231,7 +248,7 @@ func (s *PackageStore) DeleteUserSettings(ctx context.Context, pkgID, userID str
 
 const pkgCols = `p.id, p.title, p.type, p.version, p.description, p.author,
 	p.tier, p.is_system, p.scope, p.team_id, p.installed_by,
-	p.manifest, p.enabled, p.source, p.installed_at, p.updated_at`
+	p.manifest, p.enabled, p.status, p.source, p.installed_at, p.updated_at`
 
 func (s *PackageStore) scanOne(ctx context.Context, query string, args ...interface{}) (*store.PackageRegistration, error) {
 	var pkg store.PackageRegistration
@@ -243,7 +260,7 @@ func (s *PackageStore) scanOne(ctx context.Context, query string, args ...interf
 		&pkg.ID, &pkg.Title, &pkg.Type, &pkg.Version, &pkg.Description,
 		&pkg.Author, &pkg.Tier, &isSystemInt, &pkg.Scope,
 		&teamID, &installedBy,
-		&manifestJSON, &enabledInt, &pkg.Source,
+		&manifestJSON, &enabledInt, &pkg.Status, &pkg.Source,
 		&pkg.InstalledAt, &pkg.UpdatedAt,
 	)
 	if err == sql.ErrNoRows {
@@ -278,7 +295,7 @@ func (s *PackageStore) scanMany(ctx context.Context, query string, args ...inter
 			&pkg.ID, &pkg.Title, &pkg.Type, &pkg.Version, &pkg.Description,
 			&pkg.Author, &pkg.Tier, &isSystemInt, &pkg.Scope,
 			&teamID, &installedBy,
-			&manifestJSON, &enabledInt, &pkg.Source,
+			&manifestJSON, &enabledInt, &pkg.Status, &pkg.Source,
 			&pkg.InstalledAt, &pkg.UpdatedAt,
 		); err != nil {
 			return nil, err

server/store/sqlite/persona_group.go

@@ -0,0 +1,144 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"git.gobha.me/xcaliber/chat-switchboard/models"
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+type PersonaGroupStore struct{}
+
+func NewPersonaGroupStore() *PersonaGroupStore { return &PersonaGroupStore{} }
+
+const personaGroupCols = `id, name, description, owner_id, scope, team_id, created_at, updated_at`
+
+func (s *PersonaGroupStore) List(ctx context.Context, ownerID string) ([]models.PersonaGroup, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT `+personaGroupCols+` FROM persona_groups
+		WHERE owner_id = ? ORDER BY name
+	`, ownerID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	groups := []models.PersonaGroup{}
+	for rows.Next() {
+		var g models.PersonaGroup
+		if err := rows.Scan(&g.ID, &g.Name, &g.Description, &g.OwnerID,
+			&g.Scope, &g.TeamID, st(&g.CreatedAt), st(&g.UpdatedAt)); err != nil {
+			continue
+		}
+		groups = append(groups, g)
+	}
+	return groups, rows.Err()
+}
+
+func (s *PersonaGroupStore) Get(ctx context.Context, id, ownerID string) (*models.PersonaGroup, error) {
+	var g models.PersonaGroup
+	err := DB.QueryRowContext(ctx, `
+		SELECT `+personaGroupCols+` FROM persona_groups WHERE id = ? AND owner_id = ?
+	`, id, ownerID).Scan(&g.ID, &g.Name, &g.Description, &g.OwnerID,
+		&g.Scope, &g.TeamID, st(&g.CreatedAt), st(&g.UpdatedAt))
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &g, nil
+}
+
+func (s *PersonaGroupStore) Create(ctx context.Context, g *models.PersonaGroup) error {
+	g.ID = store.NewID()
+	now := time.Now().UTC()
+	g.CreatedAt = now
+	g.UpdatedAt = now
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO persona_groups (id, name, description, owner_id, scope, created_at, updated_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?)
+	`, g.ID, g.Name, g.Description, g.OwnerID, g.Scope,
+		now.Format(timeFmt), now.Format(timeFmt))
+	return err
+}
+
+func (s *PersonaGroupStore) Update(ctx context.Context, id string, fields map[string]interface{}) error {
+	for k, v := range fields {
+		_, err := DB.ExecContext(ctx,
+			`UPDATE persona_groups SET `+k+` = ?, updated_at = datetime('now') WHERE id = ?`, v, id)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (s *PersonaGroupStore) Delete(ctx context.Context, id, ownerID string) (int64, error) {
+	result, err := DB.ExecContext(ctx,
+		`DELETE FROM persona_groups WHERE id = ? AND owner_id = ?`, id, ownerID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+func (s *PersonaGroupStore) GetOwnerID(ctx context.Context, id string) (string, error) {
+	var ownerID string
+	err := DB.QueryRowContext(ctx,
+		`SELECT owner_id FROM persona_groups WHERE id = ?`, id).Scan(&ownerID)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return ownerID, err
+}
+
+func (s *PersonaGroupStore) AddMember(ctx context.Context, groupID, personaID string, isLeader bool) error {
+	if isLeader {
+		_, _ = DB.ExecContext(ctx,
+			`UPDATE persona_group_members SET is_leader = 0 WHERE group_id = ?`, groupID)
+	}
+	id := store.NewID()
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO persona_group_members (id, group_id, persona_id, is_leader)
+		VALUES (?, ?, ?, ?)
+		ON CONFLICT (group_id, persona_id) DO UPDATE SET is_leader = excluded.is_leader
+	`, id, groupID, personaID, isLeader)
+	return err
+}
+
+func (s *PersonaGroupStore) RemoveMember(ctx context.Context, memberID, groupID string) error {
+	_, err := DB.ExecContext(ctx,
+		`DELETE FROM persona_group_members WHERE id = ? AND group_id = ?`, memberID, groupID)
+	return err
+}
+
+func (s *PersonaGroupStore) ListMembers(ctx context.Context, groupID string) ([]models.PersonaGroupMember, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT pgm.id, pgm.group_id, pgm.persona_id, pgm.is_leader, pgm.sort_order,
+		       COALESCE(p.name, '') AS persona_name,
+		       COALESCE(p.handle, '') AS persona_handle,
+		       COALESCE(p.avatar, '') AS persona_avatar
+		FROM persona_group_members pgm
+		LEFT JOIN personas p ON p.id = pgm.persona_id
+		WHERE pgm.group_id = ?
+		ORDER BY pgm.is_leader DESC, pgm.sort_order, pgm.id
+	`, groupID)
+	if err != nil {
+		return []models.PersonaGroupMember{}, nil
+	}
+	defer rows.Close()
+
+	members := []models.PersonaGroupMember{}
+	for rows.Next() {
+		var m models.PersonaGroupMember
+		if err := rows.Scan(&m.ID, &m.GroupID, &m.PersonaID, &m.IsLeader, &m.SortOrder,
+			&m.PersonaName, &m.PersonaHandle, &m.PersonaAvatar); err != nil {
+			continue
+		}
+		members = append(members, m)
+	}
+	return members, rows.Err()
+}

server/store/sqlite/persona_mention.go

@@ -0,0 +1,80 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+// ── Mention resolution + display info (v0.29.0) ────────────────────────
+
+func (s *PersonaStore) FindActiveByHandle(ctx context.Context, handle string) (string, error) {
+	var id string
+	err := DB.QueryRowContext(ctx, `
+		SELECT id FROM personas
+		WHERE LOWER(handle) = LOWER(?) AND is_active = 1
+		LIMIT 1
+	`, handle).Scan(&id)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return id, err
+}
+
+func (s *PersonaStore) FindActiveByHandlePrefix(ctx context.Context, prefix string) (string, int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(*) FROM personas WHERE LOWER(handle) LIKE LOWER(?) AND is_active = 1
+	`, prefix+"%").Scan(&count)
+	if err != nil {
+		return "", 0, err
+	}
+	if count != 1 {
+		return "", count, nil
+	}
+	var id string
+	err = DB.QueryRowContext(ctx, `
+		SELECT id FROM personas WHERE LOWER(handle) LIKE LOWER(?) AND is_active = 1
+	`, prefix+"%").Scan(&id)
+	return id, 1, err
+}
+
+func (s *PersonaStore) GetNameByID(ctx context.Context, id string) (string, error) {
+	var name string
+	err := DB.QueryRowContext(ctx, `SELECT name FROM personas WHERE id = ?`, id).Scan(&name)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return name, err
+}
+
+func (s *PersonaStore) GetNamesByIDs(ctx context.Context, ids []string) (map[string]string, error) {
+	result := make(map[string]string)
+	for _, id := range ids {
+		var name string
+		err := DB.QueryRowContext(ctx, `SELECT name FROM personas WHERE id = ?`, id).Scan(&name)
+		if err == nil && name != "" {
+			result[id] = name
+		}
+	}
+	return result, nil
+}
+
+func (s *PersonaStore) GetDisplayInfoByIDs(ctx context.Context, ids []string) (map[string]store.UserDisplayInfo, error) {
+	result := make(map[string]store.UserDisplayInfo)
+	for _, id := range ids {
+		var name, avatar sql.NullString
+		_ = DB.QueryRowContext(ctx, `
+			SELECT name, avatar FROM personas WHERE id = ?
+		`, id).Scan(&name, &avatar)
+		if name.Valid {
+			info := store.UserDisplayInfo{Name: name.String}
+			if avatar.Valid {
+				info.Avatar = avatar.String
+			}
+			result[id] = info
+		}
+	}
+	return result, nil
+}

server/store/sqlite/presence.go

@@ -0,0 +1,55 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+// PresenceStore manages user_presence table.
+type PresenceStore struct{}
+
+func NewPresenceStore() *PresenceStore { return &PresenceStore{} }
+
+func (s *PresenceStore) Heartbeat(ctx context.Context, userID string) error {
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO user_presence (user_id, last_seen, status)
+		VALUES (?, datetime('now'), 'online')
+		ON CONFLICT (user_id) DO UPDATE
+		  SET last_seen = datetime('now'), status = 'online'
+	`, userID)
+	return err
+}
+
+func (s *PresenceStore) GetLastSeen(ctx context.Context, userID string) (*time.Time, error) {
+	var lastSeen time.Time
+	err := DB.QueryRowContext(ctx,
+		`SELECT last_seen FROM user_presence WHERE user_id = ?`, userID).Scan(st(&lastSeen))
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &lastSeen, nil
+}
+
+func (s *PresenceStore) GetStatuses(ctx context.Context, userIDs []string, threshold time.Time) (map[string]string, error) {
+	result := make(map[string]string, len(userIDs))
+	for _, id := range userIDs {
+		var lastSeen time.Time
+		err := DB.QueryRowContext(ctx,
+			`SELECT last_seen FROM user_presence WHERE user_id = ?`, id).Scan(st(&lastSeen))
+		if err != nil || lastSeen.Before(threshold) {
+			result[id] = "offline"
+		} else {
+			result[id] = "online"
+		}
+	}
+	return result, nil
+}
+
+// Ensure PresenceStore satisfies the interface at compile time.
+var _ store.PresenceStore = (*PresenceStore)(nil)

server/store/sqlite/project.go

@@ -418,6 +418,52 @@ func (s *ProjectStore) GetProjectIDForChannel(ctx context.Context, channelID str
 	return projectID, err
 }
 
+// ── CS5c additions (v0.29.0) ──────────────────────────────────────────
+
+func (s *ProjectStore) AdminList(ctx context.Context, includeArchived bool) ([]store.AdminProject, error) {
+	archivedFilter := "AND p.is_archived = 0"
+	if includeArchived {
+		archivedFilter = ""
+	}
+
+	rows, err := DB.QueryContext(ctx, fmt.Sprintf(`
+		SELECT p.id, p.name, p.description, p.scope,
+		       p.owner_id, p.team_id, p.is_archived,
+		       p.created_at, p.updated_at,
+		       (SELECT COUNT(*) FROM project_channels WHERE project_id = p.id),
+		       (SELECT COUNT(*) FROM project_knowledge_bases WHERE project_id = p.id),
+		       (SELECT COUNT(*) FROM project_notes WHERE project_id = p.id),
+		       COALESCE(u.username, '')
+		FROM projects p
+		LEFT JOIN users u ON u.id = p.owner_id
+		WHERE 1=1 %s
+		ORDER BY p.updated_at DESC`, archivedFilter))
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	results := make([]store.AdminProject, 0)
+	for rows.Next() {
+		var p store.AdminProject
+		var teamID sql.NullString
+		var archived int
+		if err := rows.Scan(
+			&p.ID, &p.Name, &p.Description, &p.Scope,
+			&p.OwnerID, &teamID, &archived,
+			st(&p.CreatedAt), st(&p.UpdatedAt),
+			&p.ChannelCount, &p.KBCount, &p.NoteCount,
+			&p.OwnerName,
+		); err != nil {
+			return nil, err
+		}
+		p.IsArchived = archived != 0
+		p.TeamID = NullableStringPtr(teamID)
+		results = append(results, p)
+	}
+	return results, rows.Err()
+}
+
 // ── Helpers ─────────────────────────────────
 
 func boolToInt(b bool) int {

server/store/sqlite/provider.go

@@ -203,3 +203,64 @@ func scanProviders(rows *sql.Rows) ([]models.ProviderConfig, error) {
 	}
 	return result, rows.Err()
 }
+
+// ── CS4 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *ProviderStore) DeletePersonalByOwner(ctx context.Context, ownerID string) (int64, error) {
+	result, err := DB.ExecContext(ctx,
+		`DELETE FROM provider_configs WHERE scope = 'personal' AND owner_id = ?`, ownerID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected()
+}
+
+// ── CS6 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *ProviderStore) ListAllForTeam(ctx context.Context, teamID string) ([]models.ProviderConfig, error) {
+	rows, err := DB.QueryContext(ctx,
+		fmt.Sprintf("SELECT %s FROM provider_configs WHERE scope = 'team' AND owner_id = ? ORDER BY name", providerCols),
+		teamID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanProviders(rows)
+}
+
+func (s *ProviderStore) DeleteByIDAndTeam(ctx context.Context, id, teamID string) (int64, error) {
+	res, err := DB.ExecContext(ctx,
+		`DELETE FROM provider_configs WHERE id = ? AND scope = 'team' AND owner_id = ?`,
+		id, teamID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+// ── CS7a additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *ProviderStore) FindFirstForUser(ctx context.Context, userID string) (string, error) {
+	var configID string
+	err := DB.QueryRowContext(ctx, `
+		SELECT id FROM provider_configs
+		WHERE is_active = 1 AND (
+			(scope = 'personal' AND owner_id = ?)
+			OR scope = 'global'
+		)
+		ORDER BY scope ASC, created_at ASC
+		LIMIT 1
+	`, userID).Scan(&configID)
+	return configID, err
+}
+
+func (s *ProviderStore) LoadAccessible(ctx context.Context, configID, userID string) (*models.ProviderConfig, error) {
+	row := DB.QueryRowContext(ctx, fmt.Sprintf(`
+		SELECT %s FROM provider_configs
+		WHERE id = ? AND is_active = 1
+		  AND (scope = 'global'
+		       OR (scope = 'personal' AND owner_id = ?)
+		       OR (scope = 'team' AND owner_id IN (SELECT team_id FROM team_members WHERE user_id = ?)))
+	`, providerCols), configID, userID, userID)
+	return scanProvider(row)
+}

server/store/sqlite/stores.go

@@ -42,5 +42,10 @@ func NewStores(db *sql.DB) store.Stores {
 		Packages:        NewPackageStore(),
 		Workflows:       NewWorkflowStore(),
 		Tasks:           NewTaskStore(),
+		Presence:        NewPresenceStore(),
+		PersonaGroups:   NewPersonaGroupStore(),
+		Folders:         NewFolderStore(),
+		Health:          NewHealthStore(),
+		ExtPermissions:  NewExtensionPermissionStore(),
 	}
 }

server/store/sqlite/team.go

@@ -233,3 +233,100 @@ func (s *TeamStore) IsMember(ctx context.Context, teamID, userID string) (bool,
 
 // unused but keeping for reference
 var _ = fmt.Sprintf
+
+// ── CS1 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *TeamStore) Exists(ctx context.Context, teamID string) (bool, error) {
+	var count int
+	err := DB.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM teams WHERE id = ?`, teamID).Scan(&count)
+	return count > 0, err
+}
+
+func (s *TeamStore) UpdateMemberRoleByID(ctx context.Context, memberID, teamID, role string) (int64, error) {
+	res, err := DB.ExecContext(ctx,
+		`UPDATE team_members SET role = ? WHERE id = ? AND team_id = ?`,
+		role, memberID, teamID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *TeamStore) DeleteMemberByID(ctx context.Context, memberID, teamID string) (int64, error) {
+	res, err := DB.ExecContext(ctx,
+		`DELETE FROM team_members WHERE id = ? AND team_id = ?`,
+		memberID, teamID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *TeamStore) ListTeamAuditActions(ctx context.Context, teamID string) ([]string, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT DISTINCT al.action
+		FROM audit_log al
+		WHERE al.actor_id IN (SELECT user_id FROM team_members WHERE team_id = ?)
+		ORDER BY al.action
+	`, teamID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var actions []string
+	for rows.Next() {
+		var a string
+		if err := rows.Scan(&a); err != nil {
+			return nil, err
+		}
+		actions = append(actions, a)
+	}
+	if actions == nil {
+		actions = []string{}
+	}
+	return actions, rows.Err()
+}
+
+// ── CS5b additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *TeamStore) GetFirstTeamIDForUser(ctx context.Context, userID string) (string, error) {
+	var teamID string
+	err := DB.QueryRowContext(ctx,
+		`SELECT team_id FROM team_members WHERE user_id = ? LIMIT 1`, userID).Scan(&teamID)
+	if err != nil {
+		return "", nil
+	}
+	return teamID, nil
+}
+
+// ── CS6 additions (v0.29.0) ────────────────────────────────────────────
+
+func (s *TeamStore) AddMemberReturningID(ctx context.Context, teamID, userID, role string) (string, error) {
+	id := store.NewID()
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO team_members (id, team_id, user_id, role)
+		VALUES (?, ?, ?, ?)`, id, teamID, userID, role)
+	return id, err
+}
+
+func (s *TeamStore) HasPrivateProviderRequirement(ctx context.Context, userID string) (bool, error) {
+	var has bool
+	err := DB.QueryRowContext(ctx, `
+		SELECT EXISTS(
+			SELECT 1 FROM team_members tm
+			JOIN teams t ON t.id = tm.team_id
+			WHERE tm.user_id = ?
+			  AND t.is_active = 1
+			  AND json_extract(t.settings, '$.require_private_providers') = 'true'
+		)`, userID).Scan(&has)
+	return has, err
+}
+
+func (s *TeamStore) MergeSettings(ctx context.Context, teamID, settingsJSON string) error {
+	_, err := DB.ExecContext(ctx,
+		`UPDATE teams SET settings = json_patch(COALESCE(settings, '{}'), ?) WHERE id = ?`,
+		settingsJSON, teamID)
+	return err
+}

server/store/sqlite/user.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"strings"
 	"time"
 
 	"git.gobha.me/xcaliber/chat-switchboard/models"
@@ -193,3 +194,110 @@ func (s *UserStore) scanOne(ctx context.Context, query string, args ...interface
 	ScanJSON(sj, &u.Settings)
 	return &u, nil
 }
+// ── CS1 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *UserStore) Exists(ctx context.Context, userID string) (bool, error) {
+	var count int
+	err := DB.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM users WHERE id = ?`, userID).Scan(&count)
+	return count > 0, err
+}
+
+func (s *UserStore) SearchActive(ctx context.Context, excludeUserID, query string) ([]store.UserSearchResult, error) {
+	q := `
+		SELECT id, username, COALESCE(display_name, '') AS display_name, COALESCE(handle, '') AS handle
+		FROM users
+		WHERE is_active = 1 AND id != ?`
+	args := []interface{}{excludeUserID}
+
+	if query != "" {
+		q += ` AND (LOWER(username) LIKE ? OR LOWER(display_name) LIKE ? OR LOWER(handle) LIKE ?)`
+		pattern := "%" + strings.ToLower(query) + "%"
+		args = append(args, pattern, pattern, pattern)
+	}
+
+	q += ` ORDER BY username LIMIT 20`
+
+	rows, err := DB.QueryContext(ctx, q, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var results []store.UserSearchResult
+	for rows.Next() {
+		var u store.UserSearchResult
+		if err := rows.Scan(&u.ID, &u.Username, &u.DisplayName, &u.Handle); err != nil {
+			continue
+		}
+		results = append(results, u)
+	}
+	if results == nil {
+		results = []store.UserSearchResult{}
+	}
+	return results, rows.Err()
+}
+
+// ── CS2 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *UserStore) CountByRole(ctx context.Context, role string) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM users WHERE role = ?`, role).Scan(&count)
+	return count, err
+}
+
+func (s *UserStore) MergeSettings(ctx context.Context, userID string, patch []byte) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE users SET settings = json_patch(
+			CASE WHEN settings IS NULL OR settings = 'null' OR json_type(settings) != 'object'
+				THEN '{}' ELSE settings END,
+			?), updated_at = datetime('now') WHERE id = ?
+	`, string(patch), userID)
+	return err
+}
+
+func (s *UserStore) GetVaultKeys(ctx context.Context, userID string) (bool, []byte, []byte, []byte, error) {
+	var vaultSet bool
+	var encUEK, salt, nonce []byte
+	err := DB.QueryRowContext(ctx, `
+		SELECT vault_set, encrypted_uek, uek_salt, uek_nonce
+		FROM users WHERE id = ?
+	`, userID).Scan(&vaultSet, &encUEK, &salt, &nonce)
+	return vaultSet, encUEK, salt, nonce, err
+}
+
+func (s *UserStore) UpdateVaultKeys(ctx context.Context, userID string, encUEK, salt, nonce []byte) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE users
+		SET encrypted_uek = ?, uek_salt = ?, uek_nonce = ?, updated_at = datetime('now')
+		WHERE id = ?
+	`, encUEK, salt, nonce, userID)
+	return err
+}
+
+func (s *UserStore) CountAll(ctx context.Context) (int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, "SELECT COUNT(*) FROM users").Scan(&count)
+	return count, err
+}
+
+// ── CS4 additions (v0.29.0) ─────────────────────────────────────────────
+
+func (s *UserStore) ClearVaultKeys(ctx context.Context, userID string) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE users
+		SET encrypted_uek = NULL, uek_salt = NULL, uek_nonce = NULL, vault_set = 0
+		WHERE id = ?
+	`, userID)
+	return err
+}
+
+func (s *UserStore) InitVaultKeys(ctx context.Context, userID string, encUEK, salt, nonce []byte) error {
+	_, err := DB.ExecContext(ctx, `
+		UPDATE users
+		SET encrypted_uek = ?, uek_salt = ?, uek_nonce = ?, vault_set = 1
+		WHERE id = ?
+	`, encUEK, salt, nonce, userID)
+	return err
+}

server/store/sqlite/user_mention.go

@@ -0,0 +1,62 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+// ── Mention resolution + display info (v0.29.0) ────────────────────────
+
+func (s *UserStore) FindActiveByHandle(ctx context.Context, handle, excludeUserID string) (string, error) {
+	var id string
+	err := DB.QueryRowContext(ctx, `
+		SELECT id FROM users
+		WHERE LOWER(handle) = LOWER(?) AND id != ? AND is_active = 1
+		LIMIT 1
+	`, handle, excludeUserID).Scan(&id)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return id, err
+}
+
+func (s *UserStore) FindActiveByHandlePrefix(ctx context.Context, prefix, excludeUserID string) (string, int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(*) FROM users
+		WHERE LOWER(handle) LIKE LOWER(?) AND id != ? AND is_active = 1
+	`, prefix+"%", excludeUserID).Scan(&count)
+	if err != nil {
+		return "", 0, err
+	}
+	if count != 1 {
+		return "", count, nil
+	}
+	var id string
+	err = DB.QueryRowContext(ctx, `
+		SELECT id FROM users
+		WHERE LOWER(handle) LIKE LOWER(?) AND id != ? AND is_active = 1
+		LIMIT 1
+	`, prefix+"%", excludeUserID).Scan(&id)
+	return id, 1, err
+}
+
+func (s *UserStore) GetDisplayInfoByIDs(ctx context.Context, ids []string) (map[string]store.UserDisplayInfo, error) {
+	result := make(map[string]store.UserDisplayInfo)
+	for _, id := range ids {
+		var name, avatar sql.NullString
+		_ = DB.QueryRowContext(ctx, `
+			SELECT COALESCE(display_name, username), avatar_url FROM users WHERE id = ?
+		`, id).Scan(&name, &avatar)
+		if name.Valid {
+			info := store.UserDisplayInfo{Name: name.String}
+			if avatar.Valid {
+				info.Avatar = avatar.String
+			}
+			result[id] = info
+		}
+	}
+	return result, nil
+}

server/store/sqlite/workflows.go

@@ -364,3 +364,130 @@ func nullIfEmpty(s string) interface{} {
 	}
 	return s
 }
+
+// ── Assignments (v0.29.0-cs3) ───────────────────────────────────────────
+
+func (s *WorkflowStore) CreateAssignment(ctx context.Context, a *store.WorkflowAssignment) error {
+	a.ID = store.NewID()
+	_, err := DB.ExecContext(ctx, `
+		INSERT INTO workflow_assignments (id, channel_id, stage, team_id)
+		VALUES (?, ?, ?, ?)
+	`, a.ID, a.ChannelID, a.Stage, a.TeamID)
+	return err
+}
+
+func (s *WorkflowStore) ListAssignmentsForTeam(ctx context.Context, teamID, status string) ([]store.WorkflowAssignment, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT id, channel_id, stage, team_id, assigned_to, status,
+		       created_at, claimed_at, completed_at
+		FROM workflow_assignments
+		WHERE team_id = ? AND status = ?
+		ORDER BY created_at DESC
+	`, teamID, status)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanAssignments(rows)
+}
+
+func (s *WorkflowStore) ListAssignmentsMine(ctx context.Context, userID string) ([]store.WorkflowAssignment, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT DISTINCT wa.id, wa.channel_id, wa.stage, wa.team_id, wa.assigned_to, wa.status,
+		       wa.created_at, wa.claimed_at, wa.completed_at
+		FROM workflow_assignments wa
+		LEFT JOIN team_members tm ON tm.team_id = wa.team_id AND tm.user_id = ?
+		WHERE (wa.assigned_to = ? AND wa.status = 'claimed')
+		   OR (wa.status = 'unassigned' AND tm.user_id IS NOT NULL)
+		ORDER BY wa.created_at DESC
+	`, userID, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	return scanAssignments(rows)
+}
+
+func (s *WorkflowStore) ClaimAssignment(ctx context.Context, assignmentID, userID string) (int64, error) {
+	res, err := DB.ExecContext(ctx, `
+		UPDATE workflow_assignments
+		SET assigned_to = ?, status = 'claimed', claimed_at = ?
+		WHERE id = ? AND status = 'unassigned'
+	`, userID, time.Now().UTC().Format(timeFmt), assignmentID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *WorkflowStore) CompleteAssignment(ctx context.Context, assignmentID string) (int64, error) {
+	res, err := DB.ExecContext(ctx, `
+		UPDATE workflow_assignments
+		SET status = 'completed', completed_at = ?
+		WHERE id = ? AND status = 'claimed'
+	`, time.Now().UTC().Format(timeFmt), assignmentID)
+	if err != nil {
+		return 0, err
+	}
+	return res.RowsAffected()
+}
+
+func (s *WorkflowStore) GetAssignmentChannelID(ctx context.Context, assignmentID string) (string, error) {
+	var channelID string
+	err := DB.QueryRowContext(ctx,
+		`SELECT channel_id FROM workflow_assignments WHERE id = ?`, assignmentID).Scan(&channelID)
+	return channelID, err
+}
+
+func (s *WorkflowStore) TryRoundRobin(ctx context.Context, teamID, assignmentID string) (string, error) {
+	rows, err := DB.QueryContext(ctx, `
+		SELECT m.user_id, COALESCE(MAX(wa.claimed_at), '1970-01-01 00:00:00') as last_claim
+		FROM team_members m
+		LEFT JOIN workflow_assignments wa ON wa.assigned_to = m.user_id AND wa.team_id = ?
+		WHERE m.team_id = ?
+		GROUP BY m.user_id
+		ORDER BY last_claim ASC
+		LIMIT 1
+	`, teamID, teamID)
+	if err != nil {
+		return "", err
+	}
+	defer rows.Close()
+
+	if !rows.Next() {
+		return "", nil
+	}
+	var userID, lastClaim string
+	if err := rows.Scan(&userID, &lastClaim); err != nil {
+		return "", err
+	}
+
+	_, err = DB.ExecContext(ctx, `
+		UPDATE workflow_assignments
+		SET assigned_to = ?, status = 'claimed', claimed_at = ?
+		WHERE id = ? AND status = 'unassigned'
+	`, userID, time.Now().UTC().Format(timeFmt), assignmentID)
+	if err != nil {
+		return "", err
+	}
+	return userID, nil
+}
+
+func scanAssignments(rows *sql.Rows) ([]store.WorkflowAssignment, error) {
+	var result []store.WorkflowAssignment
+	for rows.Next() {
+		var a store.WorkflowAssignment
+		var claimedAt, completedAt *time.Time
+		if err := rows.Scan(&a.ID, &a.ChannelID, &a.Stage, &a.TeamID,
+			&a.AssignedTo, &a.Status, st(&a.CreatedAt), stN(&claimedAt), stN(&completedAt)); err != nil {
+			return nil, err
+		}
+		a.ClaimedAt = claimedAt
+		a.CompletedAt = completedAt
+		result = append(result, a)
+	}
+	if result == nil {
+		result = []store.WorkflowAssignment{}
+	}
+	return result, rows.Err()
+}