Catch database connection error for polling jobs

[comaurice]

Value Statement

As a Dev

I want to be aware of any database connection error for polling jobs

So that we can prevent an uncaught polling error

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Background Context

• In Cron jobs, first call checks for matching criteria for records. NO rescue on first query, the job throws an error into WatchTower queue.

[Line where error happens] (https://github.com/department-of-veterans-affairs/vets-api/blob/master/app/sidekiq/decision_review/saved_claim_hlr_status_updater_job.rb#L22)

Outcome, Success Measure, KPI(S), and Tracking Link

• Add here

Acceptance Criteria

• Code update confirms notification of any caught errors
• AC
• AC

Designs and Build Notes

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Enablement team (if needed)

@ member of team

Out of scope

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Open questions

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Tasks

• Task
• Task
• Task

Definition of Ready

• Clear value description
• Testable acceptance criteria
• Accessibility added to acceptance criteria
• Approved designs attached
• Sample data provided where appropriate
• Estimated to fit within the sprint
• Dependencies and blockers linked

Definition of Done

• Meets acceptance criteria
• Passed E2E testing (90% coverage)
• Passed unit testing (90% coverage)
• Passed integration testing (if applicable)
• Code reviewed (internal)
• Submitted to staging
• Team approved production verification process
• Reviewed and approved by product and/or design

[eileen-coforma]

Dependent on #96645 to merge before this can clos.