feat: initial MALS implementation — Phase 1

alembic/env.py

@@ -0,0 +1,59 @@
+"""Alembic environment — uses sync psycopg2 driver for migrations."""
+
+from __future__ import annotations
+
+import os
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import create_engine
+
+# this is the Alembic Config object
+config = context.config
+
+# Interpret the config file for Python logging.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Read DATABASE_URL from environment (preferred) or alembic.ini
+database_url = os.environ.get("DATABASE_URL") or config.get_main_option("sqlalchemy.url")
+if not database_url:
+    raise RuntimeError(
+        "mals/alembic: DATABASE_URL is required. "
+        "Set it as an environment variable or in alembic.ini."
+    )
+
+# Convert asyncpg URL to psycopg2 (sync) for Alembic
+sync_url = (
+    database_url.replace("postgresql+asyncpg://", "postgresql://")
+    .replace("asyncpg://", "postgresql://")
+)
+
+target_metadata = None
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode (generate SQL only)."""
+    context.configure(
+        url=sync_url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations against a live database."""
+    connectable = create_engine(sync_url)
+    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:
+    run_migrations_online()