Fix linting errors; use lodash; add return statements

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Update import in index

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- <list-of-completed-items>

Note: <optional-note>

Fix library for use with AsyncStorage and update tests

- Update formatter
- Format and refactor for readability
- Database
  - Update some method names
  - Backup database after every change
- Queue
  - Add try/catches to help with error handling
  - Update `flushQueue` to delete every job in the array
- Update tests to ensure they pass
- Add mocks for dependencies