[barrfalk]

Replaced Bull with BullMQ across backend queues, workers, and tests, including typed Queue/Job usage, new Queue/Worker/QueueEvents creation helpers, and a dedicated :mq Redis key prefix to isolate BullMQ keys. Introduced shared job policy utilities (job-options.ts) for retry/backoff/retention, refactored worker execution into QueueModule-managed processors, and extracted shared delivery logic into DeliveryWorker, MergeBatchRunner, and DeliveryFailureHandler. Updated monitoring, reconciliation, webhook delivery, cancel/reschedule job handling, and load-test drain scripts/workflow to match BullMQ semantics and naming.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Documentation update

How Has This Been Tested?

• New unit tests
• New integrated tests
• New component tests
• New end-to-end tests
• New user flow tests
• No new tests are required
• Manual tests (description below)
• Updated existing tests

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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[mgtennant]

Looks good!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
6 Accepted issues

Measures
0 Security Hotspots
88.5% Coverage on New Code
0.0% Duplication on New Code

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