Mikhail Rogachev 60cb15739d
feat(ActivityCenter): Add community membership AC notifications (#2886)
* feat(ActivityCenter): Add community request AC notification

* feat(ActivityCenter): Add CommunityID to AC notification

* feat(ActivityCenter): Add membership status for community membership AC notifications

* feat(ActivityCenter): Add tests for community notifications and fix naming

* Add notification for kicked from community action

* feat(ActivityCenter): Fix for missing notification objects for tests
2022-10-26 02:06:20 +04:00
..
2020-01-10 19:59:01 +01:00
2020-01-10 19:59:01 +01:00
2020-04-16 15:51:28 +02:00
2021-01-08 08:43:16 +01:00

How to write migrations?

We only write up migrations, down migrations are not always possible in sqlite or too complex/too expensive. For example to remove a column you would have to duplicate the table, copy over the data, delete and recreated. This can be very expensive for some tables (user_messages for example), so should not be attempted.

Notes

One issue we faced multiple times is that updates to user_messages can be very expensive, leading to slow upgrade times and interrupted migrations. So avoid writes if not necessary.