LANTERN-866: Removed db fetcher function and all calls.

[daedalus-s]

Pull requests into this repository require the following checks to be completed by the submitter and reviewers.

Submitter:

• Administrative tasks are complete.
  • This pull request describes why these changes were made.
  • The JIRA ticket links to this PR.
  • The JIRA ticket for this PR is: LANTERN-866
• Tests are complete.
  • Tests are included and test edge cases.
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• Code review has been performed.
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• Code review has been performed.
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• Tests are complete.
  • Tests are included and test edge cases.
  • Tests have been run locally and pass.

Merger:

Prior to merging, ensure that all checks have been completed. Delete the branch after the merge
is complete.

[rishi-salunkhe-mettle]

This PR has been merged as part of the following PR: #535

Closing this PR.