submissions couchdb failed updates

[Mutugiii]

Currently getting repeated/multiple PUT requests from myPlanet on the submissions database that end up inflating DB size (observed growth ≈ 4GB/day before manual compaction -> Clean up of conflict documents)

Likely caused by requests either:

• Trying to update existing docs with the _rev missing (existing docs with _revs already)
• Trying to update the doc with an old _rev
• Non unique id generation