feat: nightly purge of obsolete workflow_runs

[egekocabas]

Motivation

We planed to “delete old test rows” but deleting the parent workflow_run instead is simpler:

• one DELETE on workflow_run removes the entire suite → case hierarchy and the matching rows in helios_deployment
• much less SQL, no danger of leaving half-orphaned rows.

I also added support to have different retention rules for different processing results (PROCESSED, FAILED, NULL).

Description

Config

• New YAML section cleanup.workflow-run: cron + ordered list of policies.

cleanup:
  workflow-run:
    cron: "0 0 1 * * *"         # default: every night 01:00 server time
    policies:
      # 1️⃣  keep the latest 2 runs,  delete any other ones
      - test-processing-status: PROCESSED
        keep: 2

      # 2️⃣  keep the latest 2 runs, delete older ones after 5 days
      - test-processing-status: FAILED
        keep: 2
        age-days: 5

      # 3️⃣  keep the latest 2 runs with NULL status, delete older ones after 5 days
      - test-processing-status: null
        keep: 2
        age-days: 5

The list is ordered; each run is evaluated by the first policy whose status matches.

Code

• WorkflowRunCleanupProps binds the YAML. Missing age-days → 0 (= “no age filter”).
• WorkflowRunCleanupTask runs on a configurable cron, loops over the policies, and calls WorkflowRunRepository.purgeObsoleteRuns()
• purgeObsoleteRuns() is plain SQL:
  • Rank the runs.
    • Inside each repository + workflow + branch bucket the query sorts the rows by created_at (newest first) and numbers them 1, 2, 3 … with row_number().
  • Protect the newest N.
    • Any row whose rank is ≤ keep is untouchable for that policy. Everything ranked >keep becomes a candidate for deletion.
  • Check the age
    • If age-days: 0 or left the key out, it will be deleted.
    • If age-days: 5 (for example), if the created_at <= 5 then it will be deleted.
  • Thanks to the foreign keys, deleting a run also deletes its test data and helios_deployments.

Flyway

• drops the old FK between helios_deployment and workflow_run and recreates it with on delete cascade

Behaviour

With this setup, the cleanup keeps the latest two PROCESSED runs for each (repository, workflow, branch) and deletes any older ones right away. For FAILED and NULL runs, we again keep the latest two, but give older ones a 5-day grace period before deleting them.

Why it's safe to remove old helios_deployment rows

Deployments are tied to workflow_run rows (at the first place), and now that we keep the latest two NULL-status (test_process) workflow runs, we’re guaranteed to retain current/in-progress deployment records. These are the only ones needed for UI pages like the deployment history page, which query the deployment table whenever the process is completed. Since we're not deleting everything and we are keeping the latest N records it’s safe to let the database remove older helios_deployment rows when their parent workflow run is deleted.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.03% (target: -1.00%)	✅ 0.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (5f7e9b8)	6809	896	13.16%
Head commit (f2fd6fc)	6826 (+17)	896 (+0)	13.13% (-0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#678)	17	0	0.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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