feat(backend): watches fire on new, edited and deleted messages and on coming online, legacy keyword included

backend/src/userbot/handlers/deletes.py

@@ -25,9 +25,11 @@ async def on_deleted_messages(client: PyroClient, messages: list[Message]) -> No
         ctx.pending_deletes.remember(chat_id, ids)
     if box:
         await repository.mark_deleted_box(ctx.pool, ctx.account_id, box)
+        await ctx.watches.on_deleted(None, box)
         await notify_bg_event(ctx.pool, "delete", ctx.account_id, message_ids=box)
     for chat_id, ids in channels.items():
         await repository.mark_deleted_channel(ctx.pool, ctx.account_id, chat_id, ids)
+        await ctx.watches.on_deleted(chat_id, ids)
         await notify_bg_event(
             ctx.pool, "delete", ctx.account_id, chat_id=chat_id, message_ids=ids
         )