Add Alembic to project for database migrations

tofu_api/models/base.py

@@ -0,0 +1,22 @@
+from sqlalchemy import MetaData
+from sqlalchemy.orm import declarative_base
+
+__all__ = [
+    'metadata',
+    'BaseModel',
+]
+
+# 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 metadata object for database schemas
+metadata = MetaData(naming_convention=_naming_convention)
+
+# Generate declarative base class for database models
+BaseModel = declarative_base(name='BaseModel', metadata=metadata)