feat: backup improvements

backend/src/features/backup/domain/backup-restore.service.ts

@@ -214,11 +214,9 @@ export class BackupRestoreService {
     const pgEnv = { ...process.env, PGPASSWORD: dbPassword };
 
     try {
-      // Drop existing connections (except our own)
-      await execAsync(
-        `psql -h ${dbHost} -p ${dbPort} -U ${dbUser} -d postgres -c "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname = '${dbName}' AND pid <> pg_backend_pid();"`,
-        { env: pgEnv }
-      );
+      // Note: We no longer terminate connections before restore.
+      // The --clean flag in pg_dump generates DROP statements that handle existing data.
+      // Terminating connections would kill the backend's own pool and break the HTTP response.
 
       // Restore the database using psql
       await execAsync(