Add Alembic to project for database migrations

tofu_api/common/database/__init__.py

@@ -1,3 +1 @@
-from .metadata import metadata_obj
-from .model import Model
 from .sqlalchemy import SQLAlchemy

tofu_api/common/database/metadata.py

@@ -1,17 +0,0 @@
-from sqlalchemy import MetaData
-
-__all__ = [
-    'metadata_obj',
-]
-
-# Define naming convention for constraints
-_naming_convention = {
-    "ix": 'ix_%(column_0_label)s',
-    "uq": "uq_%(table_name)s_%(column_0_name)s",
-    "ck": "ck_%(table_name)s_%(constraint_name)s",
-    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
-    "pk": "pk_%(table_name)s"
-}
-
-# Create global metadata object for database schemas
-metadata_obj = MetaData(naming_convention=_naming_convention)

tofu_api/common/database/model.py

@@ -1,10 +0,0 @@
-from sqlalchemy.orm import declarative_base
-
-from .metadata import metadata_obj
-
-__all__ = [
-    'Model',
-]
-
-# Generate declarative base class for database models
-Model = declarative_base(name='Model', metadata=metadata_obj)

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)