16_messages_webhooks.sql: fix comments

- storage: add explanation for wb_info

litecord/storage.py

@@ -803,6 +803,10 @@ class Storage:
         # if author_id is None, we fetch webhook info
         # from the message_webhook_info table.
         if author_id is None:
+            # webhook information in a message when made by a webhook
+            # is copied from the webhook table, or inserted by the webhook
+            # itself. this causes a complete disconnect from the messages
+            # table into the webhooks table.
             wb_info = await self.db.fetchrow("""
             SELECT webhook_id, name, avatar
             FROM message_webhook_info

manage/cmd/migration/scripts/16_messages_webhooks.sql

@@ -1,9 +1,9 @@
 -- this is a tricky one. blame discord
 
--- first, remove all messages made by webhooks
+-- first, remove all messages made by webhooks (safety check)
 DELETE FROM messages WHERE author_id is null;
 
--- delete the row, removing the fkey. no connection anymore.
+-- delete the column, removing the fkey. no connection anymore.
 ALTER TABLE messages DROP COLUMN webhook_id;
 
 -- add a message_webhook_info table. more on that in Storage._inject_author