optimisations to the token expiration emailing job

[Baalmart]

WHAT DOES THIS PR DO?

• [x] optimisations to the token expiration job
• [x] fixed some potential runtime errors for the same token expiration job where the database model was incorrectly being called or utilised

HOW DO I TEST OUT THIS PR?

• [ ] Analytics: Link to Analytics README
• [x] Auth Service: Link to Auth Service README
• [ ] Calibrate: Link to Calibrate README
• [ ] Data Proxy: Link to Data Proxy README
• [ ] Device Monitoring: Link to Device Monitoring README
• [ ] Device Registry: Link to Device Registry README
• [ ] Device Status: Link to Device Status README
• [ ] Device Uptime: Link to Device Uptime README
• [ ] Exceedances: Link to Exceedances README
• [ ] Firebase: Link to Firebase README
• [ ] GP Model: Link to GP Model README
• [ ] Incentives: Link to Incentives README
• [ ] Kafka Connectors: Link to Kafka Connectors
• [ ] Locate: Link to Locate README
• [ ] Metadata: Link to Metadata README
• [ ] Predict: Link to Predict README
• [ ] Spatial: Link to Spatial
• [ ] View: Link to View README
• [ ] Workflows: Link to Workflows README

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 30.33%. Comparing base (33dfa9b) to head (9578def). Report is 1 commits behind head on staging.

Additional details and impacted files

[](https://app.codecov.io/gh/airqo-platform/AirQo-api/pull/3202?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=airqo-platform) ```diff @@ Coverage Diff @@ ## staging #3202 +/- ## ======================================== Coverage 30.33% 30.33% ======================================== Files 184 184 Lines 24457 24457 Branches 3200 3200 ======================================== Hits 7420 7420 Misses 16923 16923 Partials 114 114 ```

[github-actions[bot]]

Auth-service changes in this PR available for preview here