fixes

backend/alembic/env.py

@@ -1,14 +1,11 @@
-import asyncio
 from logging.config import fileConfig
-from sqlalchemy import pool
-from sqlalchemy.ext.asyncio import async_engine_from_config
+from sqlalchemy import create_engine, pool
 from alembic import context
 
 config = context.config
 if config.config_file_name is not None:
     fileConfig(config.config_file_name)
 
-# Import models so Alembic can detect them
 from app.database import Base  # noqa: F401
 import app.models  # noqa: F401
 
@@ -22,24 +19,17 @@ def run_migrations_offline() -> None:
         context.run_migrations()
 
 
-def do_run_migrations(connection):
-    context.configure(connection=connection, target_metadata=target_metadata)
-    with context.begin_transaction():
-        context.run_migrations()
-
-
-async def run_migrations_online() -> None:
-    connectable = async_engine_from_config(
-        config.get_section(config.config_ini_section, {}),
-        prefix="sqlalchemy.",
-        poolclass=pool.NullPool,
-    )
-    async with connectable.connect() as connection:
-        await connection.run_sync(do_run_migrations)
-    await connectable.dispose()
+def run_migrations_online() -> None:
+    # Alembic requires a sync engine; strip the async driver prefix
+    url = config.get_main_option("sqlalchemy.url").replace("+aiosqlite", "")
+    connectable = create_engine(url, poolclass=pool.NullPool)
+    with connectable.connect() as connection:
+        context.configure(connection=connection, target_metadata=target_metadata)
+        with context.begin_transaction():
+            context.run_migrations()
 
 
 if context.is_offline_mode():
     run_migrations_offline()
 else:
-    asyncio.run(run_migrations_online())
+    run_migrations_online()