Upload alembic/env.py

alembic/env.py

@@ -0,0 +1,86 @@
+"""Alembic environment for async SQLAlchemy.
+
+Reads DATABASE_URL from app.core.config and imports all models so
+autogenerate can detect schema changes.
+"""
+
+from __future__ import annotations
+
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+# Import settings + Base + all models
+from app.core.config import get_settings
+from app.core.db import Base
+
+# Import models so Base.metadata is populated
+import app.models  # noqa: F401
+
+config = context.config
+
+# Override sqlalchemy.url from app settings
+config.set_main_option("sqlalchemy.url", get_settings().DATABASE_URL)
+
+# Configure Python logging from alembic.ini
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Metadata for autogenerate
+target_metadata = Base.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode (emits SQL without a DB connection)."""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,  # SQLite ALTER TABLE support
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection: Connection) -> None:
+    """Run migrations with the given connection."""
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        render_as_batch=True,  # SQLite ALTER TABLE support
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """Run migrations in async mode using an async engine."""
+    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:
+    """Run migrations in 'online' mode via asyncio."""
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()