setup multy db suport

python/alembic/script.py.mako

@@ -13,7 +13,7 @@ from typing import TYPE_CHECKING
 import sqlalchemy as sa
 
 from alembic import op
-from python.orm import RichieBase
+from python.orm import ${config.attributes["base"].__name__}
 
 if TYPE_CHECKING:
     from collections.abc import Sequence
@@ -24,7 +24,7 @@ down_revision: str | None = ${repr(down_revision)}
 branch_labels: str | Sequence[str] | None = ${repr(branch_labels)}
 depends_on: str | Sequence[str] | None = ${repr(depends_on)}
 
-schema=RichieBase.schema_name
+schema=${config.attributes["base"].__name__}.schema_name
 
 def upgrade() -> None:
     """Upgrade."""