Bug fixes
- Fix issue leading to impossibility to stop the worker without shutting down the database
- Fix cluster wide statistics to get fresh values
- Purge at the same frequency as we coalesce. We just don't do both at the same iteration
- Fix bloat issue
New features
- Report PoWA collector activity in pg_stat_activity and process title
- Add a new powa.debug parameter
- Add + and / operators on powa types to get delta and counters per second given two records