diff --git a/internal/storage/sqlite.go b/internal/storage/sqlite.go
index e67c646..e491e8a 100644
--- a/internal/storage/sqlite.go
+++ b/internal/storage/sqlite.go
@@ -1,6 +1,7 @@
 package storage
 
 import (
+	"context"
 	"database/sql"
 	"encoding/json"
 	"errors"
@@ -168,11 +169,10 @@ func (s *Store) migrate() error {
 
 	CREATE TABLE IF NOT EXISTS teams (
 		id TEXT PRIMARY KEY,
-		org_id TEXT NOT NULL,
+		org_id TEXT NOT NULL DEFAULT 'default',
 		name TEXT NOT NULL,
 		description TEXT NOT NULL DEFAULT '',
-		created_at TEXT NOT NULL,
-		FOREIGN KEY(org_id) REFERENCES organizations(id) ON DELETE CASCADE
+		created_at TEXT NOT NULL
 	);
 
 	CREATE TABLE IF NOT EXISTS team_members (
@@ -349,6 +349,32 @@ func (s *Store) migrate() error {
 		('smtp_from', ''),
 		('smtp_tls', 'true')`)
 
+	// Migrate existing teams table if it still has a legacy FOREIGN KEY to organizations
+	var teamsTableSQL string
+	_ = s.db.QueryRow(`SELECT sql FROM sqlite_master WHERE type='table' AND name='teams'`).Scan(&teamsTableSQL)
+	if strings.Contains(strings.ToUpper(teamsTableSQL), "ORGANIZATIONS") {
+		if conn, err := s.db.Conn(context.Background()); err == nil {
+			_, _ = conn.ExecContext(context.Background(), `PRAGMA foreign_keys = OFF;`)
+			_, _ = conn.ExecContext(context.Background(), `
+				BEGIN TRANSACTION;
+				CREATE TABLE IF NOT EXISTS teams_migrated (
+					id TEXT PRIMARY KEY,
+					org_id TEXT NOT NULL DEFAULT 'default',
+					name TEXT NOT NULL,
+					description TEXT NOT NULL DEFAULT '',
+					created_at TEXT NOT NULL
+				);
+				INSERT OR IGNORE INTO teams_migrated (id, org_id, name, description, created_at)
+				SELECT id, COALESCE(NULLIF(org_id, ''), 'default'), name, COALESCE(description, ''), created_at FROM teams;
+				DROP TABLE teams;
+				ALTER TABLE teams_migrated RENAME TO teams;
+				COMMIT;
+			`)
+			_, _ = conn.ExecContext(context.Background(), `PRAGMA foreign_keys = ON;`)
+			_ = conn.Close()
+		}
+	}
+
 	// Reindex block tags if table is newly added or empty
 	var tagCount int
 	_ = s.db.QueryRow(`SELECT COUNT(*) FROM doc_block_tags`).Scan(&tagCount)
@@ -3007,6 +3033,18 @@ func (s *Store) CreateTeam(orgID, name, description string) (*domain.Team, error
 		`INSERT INTO teams (id, org_id, name, description, created_at) VALUES (?, ?, ?, ?, ?)`,
 		team.ID, team.OrgID, team.Name, team.Description, team.CreatedAt,
 	)
+	if err != nil && strings.Contains(strings.ToUpper(err.Error()), "FOREIGN KEY") {
+		if conn, connErr := s.db.Conn(context.Background()); connErr == nil {
+			_, _ = conn.ExecContext(context.Background(), `PRAGMA foreign_keys = OFF;`)
+			_, err = conn.ExecContext(
+				context.Background(),
+				`INSERT INTO teams (id, org_id, name, description, created_at) VALUES (?, ?, ?, ?, ?)`,
+				team.ID, team.OrgID, team.Name, team.Description, team.CreatedAt,
+			)
+			_, _ = conn.ExecContext(context.Background(), `PRAGMA foreign_keys = ON;`)
+			_ = conn.Close()
+		}
+	}
 	if err != nil {
 		return nil, err
 	}