Guo Xiang Tan f27de87bf3
FIX: Update first_pm_unread_at of user's groups without unread.
If a user always read all group messages, we will never update the
`first_pm_unread_at` column since the previous query will not return the
group_user. Instead, we should update `first_pm_unread_at` to the
current timestamp if the user has read everything.

Follow-up to 9b75d95fc616ea51181d622182b0f74dea8694ac
2020-09-10 17:19:38 +08:00
..
2020-09-09 15:43:38 +08:00
2020-09-10 13:41:46 +10:00