fix: update setup script to grant sequence permissions and ensure future privileges for user

setup_database.sh

@@ -77,8 +77,15 @@ EOF
 
 echo "[7] Grant privileges to user…"
 sudo -u postgres psql -d $DB_NAME <<EOF
+-- Grant all table privileges
 GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO $DB_USER;
+
+-- Grant sequence permissions (needed for SERIAL / BIGSERIAL)
+GRANT USAGE, SELECT, UPDATE ON ALL SEQUENCES IN SCHEMA public TO $DB_USER;
+
+-- Ensure future tables & sequences also get permissions
 ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL PRIVILEGES ON TABLES TO $DB_USER;
+ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT USAGE, SELECT, UPDATE ON SEQUENCES TO $DB_USER;
 EOF
 
 echo "Done. PostgreSQL is ready for LAN + localhost connections."