feat(retention): data retention

[vm-001]

Summary

This PR introduces configurable data retention to periodically purge expired objects(events, attempts) from the database, keeping storage usage bounded and preventing historical records from degrading query performance over time.

Note:

• Retention only runs on standalone and control-plane nodes. (ignored in data-plane nodes)
• No delete cascade on attempts table.

Configuration

#retention:
#  enabled: true                               # Whether to enable data retention. Defaults to false.
#  events: 30                                  # Retention period (in days) for events. Set to 0 to disable event cleanup.
#  attempts: 60                                # Retention period (in days) for delivery attempts. Set to 0 to disable attempt cleanup.

[codecov]

Codecov Report

❌ Patch coverage is 87.09677% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
services/retention/retention.go	85.18%	8 Missing and 4 partials ⚠️
app/app.go	81.81%	1 Missing and 1 partial ⚠️
config/config.go	50.00%	1 Missing and 1 partial ⚠️
db/dao/attempt_dao.go	85.71%	1 Missing and 1 partial ⚠️
db/dao/event_dao.go	85.71%	1 Missing and 1 partial ⚠️

Flag	Coverage Δ
integration	76.44% <74.83%> (-0.04%)	⬇️
integration-o11	38.74% <18.06%> (-0.46%)	⬇️
unit	16.81% <18.70%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
config/modules/retention.go	100.00% <100.00%> (ø)
utils/fmt.go	100.00% <100.00%> (ø)
app/app.go	82.38% <81.81%> (-0.07%)	⬇️
config/config.go	50.87% <50.00%> (-0.07%)	⬇️
db/dao/attempt_dao.go	97.40% <85.71%> (-2.60%)	⬇️
db/dao/event_dao.go	88.67% <85.71%> (-1.07%)	⬇️
services/retention/retention.go	85.18% <85.18%> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.