faster remove

oml/item/models.py

@@ -104,6 +104,15 @@ class Item(db.Model):
         cls.query.filter(cls.id.in_(ids)).delete(synchronize_session=False)
         state.db.session.expire_all()
 
+    @classmethod
+    def remove_without_user(cls):
+        q = user_items.select()
+        owned_ids = {i['item_id'] for i in state.db.session.execute(q)}
+        ids = {i.id for i in cls.query.options(load_only('id'))}
+        remove = ids - owned_ids
+        if remove:
+            cls.remove_many(remove)
+
     def add_user(self, user):
         if not user in self.users:
             self.users.append(user)

oml/library.py

@@ -326,7 +326,6 @@ def sync_db():
     cleanup_lists()
 
 def cleanup_lists():
-    from sqlalchemy.orm import load_only
     import item.models
     import user.models
     with db.session():
@@ -344,10 +343,5 @@ def cleanup_lists():
 
         state.db.session.commit()
 
-        q = item.models.user_items.select()
-        user_items = {i['item_id'] for i in state.db.session.execute(q)}
-        ids = {i.id for i in item.models.Item.query.options(load_only('id'))}
-        remove = ids - user_items
-        if remove:
-            item.models.Item.remove_many(remove)
+        item.models.Item.remove_without_user()
         state.db.session.commit()

oml/user/models.py

@@ -180,13 +180,12 @@ class User(db.Model):
         self.save()
 
     def cleanup(self):
+        from item.models import user_items, Item
         List.query.filter_by(user_id=self.id).delete()
-        for i in self.items:
-            i.users.remove(self)
-            if not i.users:
-                i.delete()
-        Changelog.query.filter_by(user_id=self.id).delete()
-        Metadata.query.filter_by(user_id=self.id).delete()
+        c_user_id = user_items.columns['user_id']
+        q = user_items.delete().where(c_user_id.is_(self.id))
+        state.db.session.execute(q)
+        Item.remove_without_user()
         self.save()
         if self.id in state.peers:
             state.peers[self.id].remove()