Webmention improvements

- Tweak design for IndieAuth login flow
 - Webmentions notifications support
 - Refactor webmentions processing

alembic/env.py

@@ -49,6 +49,7 @@ def run_migrations_offline() -> None:
         target_metadata=target_metadata,
         literal_binds=True,
         dialect_opts={"paramstyle": "named"},
+        render_as_batch=True,
     )
 
     with context.begin_transaction():
@@ -69,7 +70,11 @@ def run_migrations_online() -> None:
     )
 
     with connectable.connect() as connection:
-        context.configure(connection=connection, target_metadata=target_metadata)
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            render_as_batch=True,
+        )
 
         with context.begin_transaction():
             context.run_migrations()