Allow authorless posts

amanuensis/models.py

@@ -223,6 +223,10 @@ class Membership(ModelBase):
     # Timestamp the user joined the game
     joined = Column(DateTime, nullable=False, server_default=text('CURRENT_TIMESTAMP'))
 
+    # Timestamp of the last time the user viewed the post feed
+    # This is NULL if the player has never viewed posts
+    last_post_seen = Column(DateTime, nullable=True)
+
     ###################
     # Player settings #
     ###################
@@ -557,7 +561,8 @@ class Post(ModelBase):
     lexicon_id = Column(Integer, ForeignKey('lexicon.id'), nullable=False)
 
     # The user who made the post
-    user_id = Column(Integer, ForeignKey('user.id'), nullable=False)
+    # This may be NULL if the post was made by Amanuensis
+    user_id = Column(Integer, ForeignKey('user.id'), nullable=True)
 
     ################
     # Post content #