...
- obitain a lock (write current version into 'xid' field)
- add a row with new version.
- delete aborted versions of row if exist (may be omitted for performance reasons)
- update set xid_max of previous committed row if exist
- delete previous committed versions (less or equal to cleanup version of tx snapshot) if existexist (may be omitted for performance reasons)
Cleanup of old versions
{"serverDuration": 138, "requestCorrelationId": "bdea0ecce19e1c40"}