fixing duplicate migration

lib/services/storage/migrations/sql/12.mcp-tokens.js

@@ -13,7 +13,10 @@ import crypto from 'crypto';
 // Each user gets a permanent, non-expiring secret token used for MCP API authentication.
 // Tokens are auto-generated for all existing users during this migration.
 export function up(db) {
-  db.exec(`ALTER TABLE users ADD COLUMN mcp_token TEXT`);
+  const columns = db.prepare(`PRAGMA table_info(users)`).all();
+  if (!columns.some((col) => col.name === 'mcp_token')) {
+    db.exec(`ALTER TABLE users ADD COLUMN mcp_token TEXT`);
+  }
 
   // Backfill all existing users that don't have a token yet
   const users = db.prepare(`SELECT id FROM users WHERE mcp_token IS NULL`).all();