Replace go-migrate with morph (#19116)

db/migrations/postgres/000051_create_msg_root_count.up.sql

@@ -0,0 +1,59 @@
+DO $$
+<<migrate_root_mention_count>>
+DECLARE 
+    mention_count_root_exist boolean := false;
+DECLARE
+    msg_count_root_exist boolean := false;
+BEGIN
+SELECT count(*) != 0 INTO msg_count_root_exist
+    FROM information_schema.columns
+    WHERE table_name = 'channels'
+    AND column_name = 'totalmsgcountroot';
+
+ SELECT count(*) != 0 INTO mention_count_root_exist
+    FROM information_schema.columns
+    WHERE table_name = 'channelmembers'
+    AND column_name = 'mentioncountroot';
+
+ALTER TABLE channelmembers ADD COLUMN IF NOT EXISTS mentioncountroot bigint;
+
+	WITH q AS (
+		SELECT ChannelId, COALESCE(SUM(UnreadMentions), 0) AS UnreadMentions, UserId
+		FROM ThreadMemberships
+		LEFT JOIN Threads ON ThreadMemberships.PostId = Threads.PostId
+		GROUP BY Threads.ChannelId, ThreadMemberships.UserId
+	)
+			UPDATE channelmembers
+			SET MentionCountRoot = ChannelMembers.MentionCount - q.UnreadMentions
+			FROM q
+			WHERE
+				q.ChannelId = ChannelMembers.ChannelId AND
+				q.UserId = ChannelMembers.UserId AND
+				ChannelMembers.MentionCount > 0;
+
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS totalmsgcountroot bigint;
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS lastrootpostat bigint;
+
+ALTER TABLE channelmembers ADD COLUMN IF NOT EXISTS msgcountroot bigint;
+
+IF NOT msg_count_root_exist THEN
+		WITH q AS (
+		SELECT Channels.Id channelid, COALESCE(COUNT(*),0) newcount, COALESCE(MAX(Posts.CreateAt), 0) as lastpost
+		FROM Channels
+		LEFT JOIN Posts  ON Channels.Id = Posts.ChannelId
+		WHERE Posts.RootId = ''
+		GROUP BY Channels.Id
+	)
+		UPDATE Channels SET TotalMsgCountRoot = q.newcount, LastRootPostAt=q.lastpost
+		FROM q where q.channelid=Channels.Id;
+END IF;
+
+IF NOT mention_count_root_exist THEN
+		WITH q as (SELECT TotalMsgCountRoot, Id, LastRootPostAt from Channels)
+		UPDATE ChannelMembers CM SET MsgCountRoot=TotalMsgCountRoot
+		FROM q WHERE q.id=CM.ChannelId AND LastViewedAt >= q.lastrootpostat;
+END IF;
+
+ALTER TABLE channels DROP COLUMN IF EXISTS lastrootpostat;
+
+END migrate_root_mention_count $$;