M5-T09: add exposed_entities table and ExposableEntity provider framework

alembic_app/env.py

@@ -12,6 +12,7 @@ from app.models.public_ip import PublicIPHistory, PublicIPState  # noqa: F401
 from app.models.location import Location  # noqa: F401
 from app.models.poo import PooRecord  # noqa: F401
 from app.models.modbus import ModbusDevice, ModbusReading  # noqa: F401
+from app.models.expose import ExposedEntityToggle  # noqa: F401
 
 config = context.config