mysql - Extend database for group/collaborative messaging -


i have following database schema messaging app i'm creating:-

table name:- conversation_threads

+-----------------+-------+---------+ | conversation_id | label | members | +-----------------+-------+---------+ | 1               | test  | 1,2     | +-----------------+-------+---------+ | 2               | xyz   | 4,1     | +-----------------+-------+---------+

table name:- messages

+------------+----------------+-----------+-----------------+---------------------+ | message_id | message        | sender_id | conversation_id | created_at          | +------------+----------------+-----------+-----------------+---------------------+ | 1          | hello          | 1         | 1               | 2017-09-12 09:00:00 | +------------+----------------+-----------+-----------------+---------------------+ | 2          | hi             | 2         | 1               | 2017-09-12 09:02:00 | +------------+----------------+-----------+-----------------+---------------------+ | 3          | hey!           | 4         | 2               | 2017-09-12 08:16:00 | +------------+----------------+-----------+-----------------+---------------------+

table name:- message_users

+----------+-------------+---------+--------+ | mu_id    | message_id  | user_id | status | +----------+-------------+---------+--------+ | 1        | 1           | 1       | read   | +----------+-------------+---------+--------+ | 2        | 1           | 2       | unread | +----------+-------------+---------+--------+ | 3        | 2           | 2       | read   | +----------+-------------+---------+--------+ | 4        | 2           | 1       | unread | +----------+-------------+---------+--------+ | 5        | 3           | 4       | read   | +----------+-------------+---------+--------+ | 6        | 3           | 1       | unread | +----------+-------------+---------+--------+

this schema works quite fine one-to-one messaging.

but want introduce more 2 users in single conversation 3 or 4 or more people can collaborate , discuss things.

what facing problem if add user in members field in conversation threads - gets accessibility read messages present in particular conversation thread since beginning - although added late conversation.

please provide me solution on how tackle particular problem.

hope question not broad.

if understand schema relation have put members did

+-----------------+-------+---------+ | conversation_id | label | members | +-----------------+-------+---------+ | 1               | test  | 1,2,3,4 | +-----------------+-------+---------+

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