fix: prune expired state history

[IceCodeNew]

Summary

• prune processed articles, published briefings, and context snapshots outside HISTORY_HOURS
• prune warnings outside their independent WARNING_RETENTION_HOURS
• run cleanup only after a successful task, in the same transaction as task-health reset
• preserve records exactly on each retention boundary and leave pending articles and upsert health state untouched

Why

The append-only history tables retained full article, briefing, and context bodies indefinitely. Long-running daemon instances therefore accumulated unbounded SQLite state even though application reads only use configured history windows.

Impact

Successful tasks now keep persisted history aligned with the windows already used by the service. Failed tasks retain existing history, and unpublished pending articles are never pruned by this cleanup.

Validation

• prek run --all-files
• uv run --with pytest --with pytest-cov -- pytest --cov --cov-branch --cov-report=xml
• 482 tests passed; line coverage 99.70%, branch coverage 98.33%

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 633960d3-b1da-4158-8faf-55395b3ddd5b

📥 Commits

Reviewing files that changed from the base of the PR and between 8107b4d and 6545203.

📒 Files selected for processing (4)

• docs/design.md
• tests/test_state.py
• weather_briefing/service.py
• weather_briefing/state.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/prune-state-history

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.51%. Comparing base (8107b4d) to head (6545203).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   99.51%   99.51%           
=======================================
  Files          39       39           
  Lines        5728     5761   +33     
  Branches      329      329           
=======================================
+ Hits         5700     5733   +33     
  Misses         17       17           
  Partials       11       11           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

[IceCodeNew]

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