fix: align webhook regenerate route with frontend path

internal/store/store.go

@@ -56,10 +56,28 @@ func (s *Store) DB() *sql.DB {
 	return s.db
 }
 
-// migrate creates all tables if they do not already exist.
+// migrate creates all tables if they do not already exist, then runs
+// incremental migrations for schema changes added after initial release.
 func (s *Store) migrate() error {
-	_, err := s.db.Exec(schema)
-	return err
+	if _, err := s.db.Exec(schema); err != nil {
+		return err
+	}
+	return s.runMigrations()
+}
+
+// runMigrations applies additive schema changes that cannot be expressed
+// with CREATE TABLE IF NOT EXISTS.
+func (s *Store) runMigrations() error {
+	migrations := []string{
+		// Add owner column to registries (2026-03-28).
+		`ALTER TABLE registries ADD COLUMN owner TEXT NOT NULL DEFAULT ''`,
+	}
+
+	for _, m := range migrations {
+		// Ignore errors from already-applied migrations (duplicate column).
+		_, _ = s.db.Exec(m)
+	}
+	return nil
 }
 
 const schema = `