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alembic/env.py

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+"""Alembic environment — async, settings-driven, model-aware.
+
+The DB URL comes from app settings (env), never alembic.ini. ``target_metadata``
+points at the ORM ``Base.metadata``; importing ``app.infrastructure.db.models``
+registers every model so autogenerate sees the full schema.
+"""
+
+import asyncio
+from logging.config import fileConfig
+
+from alembic import context
+from app.core.config import get_settings
+from app.infrastructure.db import Base
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+# Import side-effect: registers all ORM models on Base.metadata.
+# Uncomment once models exist (plan §11 step 2):
+# import app.infrastructure.db.models
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+config.set_main_option("sqlalchemy.url", get_settings().database_url)
+
+target_metadata = Base.metadata
+
+
+def _run_migrations(connection: Connection) -> None:
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        compare_type=True,
+        compare_server_default=True,
+        render_as_batch=False,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_offline() -> None:
+    context.configure(
+        url=config.get_main_option("sqlalchemy.url"),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+    )
+    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.",
+    )
+    async with connectable.connect() as connection:
+        await connection.run_sync(_run_migrations)
+    await connectable.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())