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Trim the number of log entries per user to 100 at most, but only run
the (relatively expensive) compaction for users that actually log in:
this is determined by keeping a small in memory cache of active
usernames hooked to 'add_log'.

Also comes with a simple implementation of cron-like background jobs.

Last login

See merge request !1

Add two api calls (/api/set_last_login and /api/get_last_login) to allow
centralized tracking of users last login.
Signed-off-by: shammash <shammash@autistici.org>

Signed-off-by: shammash <shammash@autistici.org>

Explicitly mark where we discard errors on purpose.

As it is for other id/ services.

Using the clientutil.Backend abstraction.

Enforced on the AddLog method.

The 'migrate' package returns an error if no migrations were applied
because the database was already in the target state. Catch that and
continue execution normally.