mypy typecheck pass

amanuensis/backend/article.py

@@ -2,7 +2,7 @@
 Article query interface
 """
 
-from typing import Union
+from typing import Optional
 
 from sqlalchemy import select
 
@@ -14,7 +14,7 @@ def create(
     db: DbContext,
     lexicon_id: int,
     user_id: int,
-    character_id: Union[int, None],
+    character_id: Optional[int],
 ) -> Article:
     """
     Create a new article in a lexicon.

amanuensis/backend/character.py

@@ -2,7 +2,7 @@
 Character query interface
 """
 
-from typing import Union
+from typing import Optional
 
 from sqlalchemy import select, func
 
@@ -15,7 +15,7 @@ def create(
     lexicon_id: int,
     user_id: int,
     name: str,
-    signature: Union[str, None],
+    signature: Optional[str],
 ) -> Character:
     """
     Create a new character for a user.