Mateusz Mandera 962ab13203 push_notifs: Make push_notifications_enabled more resistant to flapping. ...

Fixes #28403

Uses redis to remember the last time push notifications were experienced
working. This needs to work across processes, so can't be done just in
memory.
As this is transient data that's fairly harmless to lose and thus
doesn't require the persistence benefits of the database, and we're
keeping a single "row", so don't need an entire new db table, we settle
on using redis instead of postgres. This is also consistent with how we
store other kinds of such transient data.

2024-04-19 10:25:34 -07:00

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