Related: [[ https://linear.app/comm/issue/ENG-10541/prekey-verification-failed-for-prod-keyserver | ENG-10541 ]]
- Replaced fallback memory values from 0 to -1 to disambiguate missing usage from 0 usage
- Added log for the first time memory values are accessed, to have a reference value
- Added logs to other cron jobs - they fail too, sometimes between the 15-min cron job
- Wrapped OTK upload in try-catch, from logs it turns out it crashed before
- Moved memory usage logging into `finally` blocks - not sure if this is okay