Logger output being visible depends on user configuration, but most of
the prints in mix tasks should always be shown. When running inside a
mix shell, it’s probably preferable to send output directly to it rather
than using raw IO.puts and we already have shell_* functions for this,
let’s use them everywhere.
Pruning can go on for a long time; give admins some insight into that
something is happening to make it less frustrating and to make it easier
which part of the process is stalled should this happen.
Again most of the changes are merely reindents;
review with whitespace changes hidden recommended.
May sometimes be helpful to get more predictable runtime
than just with an age-based limit.
The subquery for the non-keep-threads path is required
since delte_all does not directly accept limit().
Again most of the diff is just adjusting indentation, best
hide whitespace-only changes with git diff -w or similar.
This gives feedback when to stop rerunning limited batches.
Most of the diff is just adjusting indentation; best reviewed
with whitespace-only changes hidden, e.g. `git diff -w`.
This part of pruning can be very expensive and bog down the whole
instance to an unusable sate for a long time. It can thus be desireable
to split it from prune_objects and run it on its own in smaller limited batches.
If the batches are smaller enough and spaced out a bit, it may even be possible
to avoid any downtime. If not, the limit can still help to at least make the
downtime duration somewhat more predictable.
