Add Alembic to project for database migrations

tofu_api/common/database/sqlalchemy.py

@@ -1,12 +1,11 @@
 from typing import Optional, cast
 
 from flask import Flask
-from sqlalchemy import MetaData, create_engine
+from sqlalchemy import create_engine
 from sqlalchemy.engine import Engine
 from sqlalchemy.orm import Session, scoped_session, sessionmaker
 
 from tofu_api.common.config import Config
-from .metadata import metadata_obj
 
 __all__ = [
     'SQLAlchemy',
@@ -70,22 +69,3 @@ class SQLAlchemy:
         # For all further purposes, the scoped session should be treated like a regular Session object.
         # Use cast() so we can use Session as the type annotation.
         return cast(Session, self._scoped_session)
-
-    @property
-    def metadata(self) -> MetaData:
-        """
-        Database metadata object.
-        """
-        return metadata_obj
-
-    def create_all_tables(self) -> None:
-        """
-        Create tables in the database for all models defined in the metadata.
-        """
-        self.metadata.create_all(self.engine)
-
-    def drop_all_tables(self) -> None:
-        """
-        Delete tables in the database for all models defined in the metadata.
-        """
-        self.metadata.drop_all(self.engine)