fixing code under python 3.9

Signed-off-by: Grant Ramsay <[email protected]>

.gitignore

@@ -211,3 +211,4 @@ cython_debug/
 openapi.json
 test.db
 docs/CNAME
+.python-version

app/database/helpers.py

@@ -1,24 +1,31 @@
 """Define some database helper functions."""
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Union
 
 from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.user import User
 
+if TYPE_CHECKING:
+    from sqlalchemy.ext.asyncio import AsyncSession
+
 
 async def get_all_users_(session: AsyncSession):
     """Return all Users in the database."""
     result = await session.execute(select(User))
     return result.scalars().all()
 
 
-async def get_user_by_email_(email, session: AsyncSession) -> User | None:
+async def get_user_by_email_(email, session: AsyncSession) -> Union[User, None]:
     """Return a specific user by their email address."""
     result = await session.execute(select(User).where(User.email == email))
     return result.scalars().first()
 
 
-async def get_user_by_id_(user_id: int, session: AsyncSession) -> User | None:
+async def get_user_by_id_(
+    user_id: int, session: AsyncSession
+) -> Union[User, None]:
     """Return a specific user by their email address."""
     result = await session.execute(select(User).where(User.id == user_id))
     return result.scalars().first()