Optimize image deletion

[jue-henry]

No description provided.

[jue-henry]

Preliminary timing results after commit 4c697c7, makes all s3 image deletions in one call

log-events-viewer-result (1).csv

Avg total deletion per 100 images: 1.635 seconds
Avg mongo deletion per 100 images: 0.8332 seconds
Avg s3 deletion per 100 images: 0.802 seconds

[jue-henry]

Test results after commit 1fc07bb, moves all mongo record deletions to 1 call for each collecton:

log-events-viewer-result (2).csv

Avg total deletion per 100 images: 0.877 seconds
Avg mongo deletion per 100 images: 0.1506 seconds
Avg s3 deletion per 100 images: 0.7264 seconds

[jue-henry]

So kinda stuck on this bit. Should we only delete images that we can find mongo records for or should we just delete all images that were inputted by the user?