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docs/features/checked/scanner/trace-retention-and-pruning-manager.md

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+# Trace Retention and Pruning Manager
+
+## Module
+Scanner
+
+## Status
+VERIFIED
+
+## Description
+Manages runtime trace lifecycle with configurable retention periods (default 30 days), automatic pruning of old traces while preserving those referenced by active slices, trace aggregation, and storage quota enforcement.
+
+## Implementation Details
+- **Trace Retention Manager**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Runtime/Retention/TraceRetentionManager.cs` - `TraceRetentionManager` managing runtime trace lifecycle with configurable retention periods (default 30 days), automatic pruning of expired traces while preserving those referenced by active reachability slices, trace aggregation, and storage quota enforcement
+
+## E2E Test Plan
+- [ ] Configure a 30-day retention period and verify traces older than 30 days are automatically pruned
+- [ ] Verify traces referenced by active reachability slices are preserved even if they exceed the retention period
+- [ ] Verify trace aggregation combines repeated observations into summary records before pruning individual traces
+- [ ] Configure a storage quota and verify the retention manager prunes oldest traces when quota is exceeded
+- [ ] Verify pruning is idempotent (running multiple times produces the same result)
+- [ ] Verify retention configuration can be updated without data loss
+
+---
+
+## Verification
+
+| Check | Result |
+|-------|--------|
+| Tier 0 - Source files exist | PASS |
+| Tier 1 - Build + code review | PASS |
+| Tier 2 - Integration tests | PASS |
+| Verified | 2026-02-13T18:10:00Z |