fix: redefine new CAs to group by test_id

[joseph-sentry]

there's no index currently covering the testsuite, classname and name fields, and we don't want to create an index on those fields because names can be long, so we should group by test_id, because an index already exists

[codecov]

Codecov Report

❌ Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.19%. Comparing base (75453d9) to head (bc20e36).
⚠️ Report is 1 commits behind head on main.

⚠️ Current head bc20e36 differs from pull request most recent head c5e613f

Please upload reports for the commit c5e613f to get more accurate results.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libs/shared/shared/django_apps/migration_utils.py	94.59%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #390   +/-   ##
=======================================
  Coverage   94.19%   94.19%           
=======================================
  Files        1261     1262    +1     
  Lines       46611    46646   +35     
  Branches     1491     1493    +2     
=======================================
+ Hits        43903    43936   +33     
- Misses       2404     2405    +1     
- Partials      304      305    +1     

Flag	Coverage Δ
apiunit	96.17% <ø> (ø)
sharedintegration	40.04% <21.27%> (-0.12%)	⬇️
sharedunit	88.94% <95.74%> (+0.01%)	⬆️
workerintegration	61.28% <ø> (ø)
workerunit	90.70% <ø> (ø)

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 95.74468% with 2 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
libs/shared/shared/django_apps/migration_utils.py	94.59%	1 Missing and 1 partial ⚠️

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[codspeed-hq]

CodSpeed Performance Report

Merging #390 will not alter performance

_{Comparing joey/fix-cas (42ceb38) with main (4e970e9)¹}

Summary

✅ 9 untouched benchmarks

Footnotes

1. No successful run was found on main (0e72252) during the generation of this report, so 4e970e9 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[seer-by-sentry]

Potential bug: The create_continuous_aggregate function lacks IF NOT EXISTS, making migrations non-idempotent. Re-running a failed migration will cause a database error, halting the process and leaving the schema inconsistent.

• Description: The create_continuous_aggregate function in migration_utils.py generates a CREATE MATERIALIZED VIEW SQL statement without the IF NOT EXISTS clause. While the migration drops views before recreating them, this is not robust. If the migration fails and is retried, the attempt to recreate an existing view will cause a relation "view_name" already exists error from PostgreSQL, halting the process. Because the migration is atomic = False, this failure can leave the database schema in a partially migrated, inconsistent state requiring manual intervention. This breaks the established pattern of idempotent migrations.

• Suggested fix: Modify the create_continuous_aggregate function to include IF NOT EXISTS in the generated CREATE MATERIALIZED VIEW statement. This will make the migration idempotent and robust against retries, aligning with repository standards and preventing failures in operational scenarios like rollbacks or retries.
  _{severity: 0.72, confidence: 0.95}

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