Jun 26 MT-0 phase

control/migrations/env.py

@@ -0,0 +1,67 @@
+"""
+control/migrations/env.py
+-------------------------
+Standalone Alembic environment for the control plane. Unlike the data-plane
+env (which pulls its engine from the Flask app), this reads the URL directly
+from CONTROL_DATABASE_URL and targets ControlBase.metadata. No Flask import.
+"""
+
+import os
+import sys
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config, pool
+from alembic import context
+
+# Make the repo root importable so `import control.*` resolves when Alembic
+# is invoked as `alembic -c control/migrations/alembic.ini ...`.
+sys.path.insert(
+    0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
+)
+
+from control.base import ControlBase, get_control_database_url  # noqa: E402
+import control.models  # noqa: E402,F401  (registers tables on ControlBase.metadata)
+
+config = context.config
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Inject the URL from the environment (escape % for ConfigParser).
+config.set_main_option(
+    'sqlalchemy.url', get_control_database_url().replace('%', '%%')
+)
+
+target_metadata = ControlBase.metadata
+
+
+def run_migrations_offline():
+    context.configure(
+        url=config.get_main_option('sqlalchemy.url'),
+        target_metadata=target_metadata,
+        literal_binds=True,
+        compare_type=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix='sqlalchemy.',
+        poolclass=pool.NullPool,
+    )
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()