fix(worker): Remove Sentry re-initialization in forked workers

[drazisil-codecov]

Summary

Removes the initialize_sentry_for_worker_process signal handler that was calling sentry_sdk.init() again in each forked worker process.

We believe this may be breaking CeleryIntegration's build_tracer patch - calling init() a second time in child processes could interfere with the patches that were already applied in the parent process before fork.

Investigation Findings

• Staging (Dec 17, 2025 code without this handler) has working worker traces
• Production (with this handler) has zero worker transactions in Sentry
• Trace analysis shows API spans but no worker spans in production
• Diagnostic check showed build_tracer patched: False in production

The parent process's Sentry initialization (via celeryd_init signal in app.py) should be inherited by forked children, so re-initialization may not be needed.

Test Plan

• Deploy to staging and verify worker transactions appear in Sentry
• Deploy to production and monitor for worker transactions
• Verify errors are still captured correctly

Related

Relates to: CCMRG-2037

---

Note

Medium Risk
Changes Sentry initialization timing/behavior in worker processes, which could affect error/trace reporting if fork inheritance differs across environments; otherwise the diff is small and localized.

Overview
Stops re-initializing Sentry in each forked Celery worker process by removing the worker_process_init Sentry init signal handler and its related imports, relying on the parent-process initialization instead; Sentry flushing on worker shutdown remains.

Also updates apps/worker/Makefile to use the v2 docker compose CLI for the shell target.

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[linear]

CCMRG-2037 Investigate: Production worker Sentry tracing stopped working around Dec 1st

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.43%. Comparing base (2918025) to head (1ed767c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #680   +/-   ##
=======================================
  Coverage   92.43%   92.43%           
=======================================
  Files        1297     1297           
  Lines       47730    47725    -5     
  Branches     1606     1606           
=======================================
- Hits        44119    44116    -3     
+ Misses       3302     3300    -2     
  Partials      309      309           

Flag	Coverage Δ
workerintegration	58.59% <ø> (-0.01%)	⬇️
workerunit	90.34% <ø> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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