Add Limit (#20762)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/post_store.go

@@ -1230,7 +1230,10 @@ func (s *SqlPostStore) getPostsSinceCollapsedThreads(options model.GetPostsSince
 		Where(sq.Eq{"Posts.ChannelId": options.ChannelId}).
 		Where(sq.Gt{"Posts.UpdateAt": options.Time}).
 		Where(sq.Eq{"Posts.RootId": ""}).
-		OrderBy("Posts.CreateAt DESC").ToSql()
+		OrderBy("Posts.CreateAt DESC").
+		Limit(1000).
+		ToSql()
+
 	if err != nil {
 		return nil, errors.Wrapf(err, "getPostsSinceCollapsedThreads_ToSql")
 	}