Set 31536000s (1 year) TTL for Encounters from time_updated
Added API Endpoint DELETE /api/encounters/prune/:pruneDate
Deletes all user Encounters whose time_updated field precedes pruneDate
Added test case for prune endpoint
Note - Users must manually prune. Frontend implementation would require users to submit a date which they would like all Encounters that haven't been updated since before that date to be pruned
Completed backend for pruning
time_updatedtime_updatedfield precedes pruneDateNote - Users must manually prune. Frontend implementation would require users to submit a date which they would like all Encounters that haven't been updated since before that date to be pruned