buildable docker compose

backend/app/main.py

@@ -13,6 +13,29 @@ from app.user_models import User
 from app.api import events, auth, station_config, history, team, community, shows, storage, underwriters, stats
 
 
+def _cleanup_orphaned_sequences(sync_conn):
+    """Drop model sequences whose backing table no longer exists.
+
+    Prevents 'duplicate key value violates unique constraint' errors when
+    create_all() tries to recreate a SERIAL-backed sequence for a table
+    whose original sequence was left behind after a drop/recreate cycle.
+    Only runs on PostgreSQL; no-op for SQLite.
+    """
+    import sqlalchemy as sa
+
+    if sync_conn.dialect.name != "postgresql":
+        return
+
+    inspector = sa.inspect(sync_conn)
+    existing_tables = set(inspector.get_table_names())
+
+    for table in Base.metadata.tables.values():
+        expected_seq = f"{table.name}_id_seq"
+        if table.name not in existing_tables:
+            sync_conn.execute(sa.text(f"DROP SEQUENCE IF EXISTS {expected_seq}"))
+            print(f"  → Dropped orphaned sequence {expected_seq}")
+
+
 def _migrate_add_missing_columns(sync_conn):
     """Add missing columns to existing tables (startup migration — no Alembic).
 
@@ -82,6 +105,7 @@ async def _ensure_station_config(session):
 async def lifespan(app: FastAPI):
     # Create tables on startup, then patch any missing columns
     async with engine.begin() as conn:
+        await conn.run_sync(_cleanup_orphaned_sequences)
         await conn.run_sync(Base.metadata.create_all)
         await conn.run_sync(_migrate_add_missing_columns)