* Close sessions between loops to make sure we leave no lock
* Close at the end
* Close before sleeps
* Use python generic empty list in case the events is an iterator
* fix: commit transaction after taking event
* feat: allow to reconnect to postgres for event listener
* chore: log sync events pending to process to metrics
* fix: make dead_letter runner able to process events without needing to have lock on the event
* chore: close Session after reconnect
* refactor: make EventSource emit only events that can be processed
* feat: add protocol buffers for events
* chore: add EventDispatcher
* chore: add WebhookEvent class
* chore: emit events
* feat: initial version of event listener
* chore: emit user plan change with new timestamp
* feat: emit metrics + add alias status to create event
* chore: add newrelic decorator to functions
* fix: event emitter fixes
* fix: take null end_time into account
* fix: avoid double-commits
* chore: move UserDeleted event to User.delete method
* db: add index to sync_event created_at and taken_time columns
* chore: add index to model
