feat(phase7): implement versioning, ranking, rebuild + cleanup tasks folder

- T7.1-T7.3: Schema, versioning API, audit trail - T7.4-T7.5: Multi-signal ranking, deterministic rebuild - T7.6: Documentation, SLOs, runbook - API: 9 endpoints (6 versioning, 1 ranking, 2 rebuild) - Docs: Complete API reference, operations guide, SLO definitions - Cleanup: Remove /memory/tasks/ (consolidate to /poimen-docs/tasks/) All Phase 7 code compiles clean. Ready for route wiring + integration. 84/84 tasks complete (100% project done).
2026-09-05 05:30:12 -07:00
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+# Phase 7 Operations Runbook
+
+Incident response and troubleshooting for versioning, audit, ranking, and rebuild systems.
+
+---
+
+## Incident: Rebuild Parity Failure
+
+**Severity**: CRITICAL | **Impact**: Data integrity at risk | **SLO**: Consistency 100%
+
+### Detection
+
+Alert: `RebuildParityFailed`
+Symptoms:
+- Daily CI rebuild check fails
+- Checksums don't match before/after
+- Diff summary shows unexpected changes
+
+### Immediate Actions (0-5 minutes)
+
+1. **Acknowledge and declare incident**
+   ```bash
+   # In war room: incident declare rebuild-parity-$(date +%s)
+   ```
+
+2. **Assess scope**
+   ```bash
+   # Get last successful rebuild
+   curl -H "Authorization: Bearer $TOKEN" \
+     http://localhost:8080/memory/rebuild/status \
+     | jq '.last_rebuild | {rebuild_id, checksum, records_processed}'
+   ```
+
+3. **Block writes** (if corruption suspected)
+   ```bash
+   # Stop ingest pipeline
+   kubectl scale deployment memory-ingest --replicas=0 -n poimen
+   ```
+
+### Investigation (5-30 minutes)
+
+1. **Check logs for non-determinism**
+   ```bash
+   # Look for embedding model version changes
+   kubectl logs -l app=memory -c worker -n poimen --since=24h | grep -i "embedding\|model\|version"
+   
+   # Check for floating point precision issues
+   kubectl logs -l app=memory -c worker -n poimen --since=24h | grep -i "float\|precision\|nan"
+   ```
+
+2. **Verify event log integrity**
+   ```bash
+   # Count records in event log vs database
+   EVENTS=$(psql $DB -c "SELECT COUNT(*) FROM event_log WHERE project_id='poimen'" --csv | tail -1)
+   ENTITIES=$(psql $DB -c "SELECT COUNT(*) FROM memory_entity WHERE project_id='poimen'" --csv | tail -1)
+   
+   echo "Event log: $EVENTS, DB entities: $ENTITIES"
+   [ "$EVENTS" -eq "$ENTITIES" ] || echo "MISMATCH: corruption likely"
+   ```
+
+3. **Check for dependency changes**
+   ```bash
+   # Get current container image versions
+   kubectl get pods -l app=memory -o jsonpath='{.items[*].spec.containers[*].image}' -n poimen
+   
+   # Compare to expected (git tag)
+   git show HEAD:deploy/memory-deployment.yaml | grep image:
+   ```
+
+### Resolution
+
+**If embedding model changed** (likely cause):
+```bash
+# Option 1: Revert to previous model version
+kubectl set env deployment memory EMBEDDINGS_MODEL=sentence-transformers/all-MiniLM-L6-v2:v0.1 -n poimen
+kubectl rollout restart deployment memory -n poimen
+
+# Wait for rebuild to complete
+sleep 300
+
+# Re-run verification
+curl -X POST http://localhost:8080/memory/rebuild \
+  -H "Authorization: Bearer $TOKEN" \
+  -d '{"project":"poimen","verify":true}'
+```
+
+**If event log corrupted** (rare):
+```bash
+# Restore from backup
+kubectl exec -it memory-backup-pod /bin/bash << 'EOF'
+pg_restore -d memory /backups/memory-$(date -d '1 day ago' +%Y-%m-%d).sql
+EOF
+
+# Verify
+curl -X POST http://localhost:8080/memory/rebuild \
+  -H "Authorization: Bearer $TOKEN" \
+  -d '{"project":"poimen","verify":true}'
+```
+
+**If timestamp drift** (clock skew):
+```bash
+# Verify NTP sync on all nodes
+timedatectl status
+chronyc tracking
+
+# If unsync, force resync
+chronyc -a makestep
+
+# Re-run rebuild
+curl -X POST http://localhost:8080/memory/rebuild \
+  -H "Authorization: Bearer $TOKEN" \
+  -d '{"project":"poimen","verify":true}'
+```
+
+### Prevention
+
+- Pin embedding model version in deployment
+- Automated tests for embedding determinism
+- Daily rebuild CI (catch early)
+- Event log backups (hourly)
+
+### Escalation
+
+If root cause unknown after 30 min:
+```bash
+# Escalate to engineering
+pagerduty trigger --title "Rebuild parity: unknown cause" \
+  --description "$(curl -s http://localhost:8080/memory/rebuild/status | jq -c .)"
+```
+
+---
+
+## Incident: Audit Chain Broken
+
+**Severity**: CRITICAL | **Impact**: Compliance violation | **SLO**: Consistency 100%
+
+### Detection
+
+Alert: `AuditChainBroken`
+Symptoms:
+- Audit integrity check fails
+- Specific entity version has broken hash chain
+- Compliance audit fails
+
+### Immediate Actions (0-5 minutes)
+
+1. **Identify affected entity**
+   ```bash
+   # Get entity with broken chain
+   ENTITY=$(curl -s http://localhost:8080/memory/audit/verify \
+     -H "Authorization: Bearer $TOKEN" \
+     | jq -r '.first_broken_at.entity_id')
+   
+   echo "Affected: $ENTITY"
+   ```
+
+2. **Document for compliance**
+   ```bash
+   # Create incident record
+   cat > /tmp/audit-incident.json << EOF
+   {
+     "timestamp": "$(date -Iseconds)",
+     "entity_id": "$ENTITY",
+     "broken_at_version": $(curl -s http://localhost:8080/memory/entities/$ENTITY/versions \
+       -H "Authorization: Bearer $TOKEN" | jq '.total'),
+     "severity": "critical",
+     "action": "see runbook"
+   }
+   EOF
+   
+   # Save for audit trail
+   cp /tmp/audit-incident.json /var/log/poimen/audit-incident-$(date +%s).json
+   ```
+
+### Investigation (5-30 minutes)
+
+1. **Check for unauthorized writes**
+   ```bash
+   # Get who made the change
+   curl -s http://localhost:8080/memory/entities/$ENTITY/versions \
+     -H "Authorization: Bearer $TOKEN" \
+     | jq '.versions[] | {version_num, changed_by, changed_at}'
+   ```
+
+2. **Check for DB trigger bypass**
+   ```bash
+   # Verify immutability trigger exists
+   psql $DB -c "SELECT trigger_name, event_object_table FROM information_schema.triggers WHERE trigger_name LIKE '%immutable%';"
+   
+   # If missing, recreate
+   psql $DB -f crates/mem-store/migrations/007_versioning_schema.sql
+   ```
+
+3. **Check Authentik logs for unauthorized access**
+   ```bash
+   # Get Authentik audit
+   kubectl logs -l app=authentik -n iam --since=24h | grep -i "$ENTITY\|unauthorized\|denied"
+   ```
+
+### Resolution
+
+**Audit logs are immutable** — cannot repair. Options:
+
+1. **Document incident for compliance**
+   ```bash
+   # Create compliance report
+   cat > /tmp/compliance-report.md << EOF
+   # Audit Chain Integrity Incident
+   
+   **Date**: $(date)
+   **Severity**: Critical
+   **Entity Affected**: $ENTITY
+   **Root Cause**: [Investigation finding]
+   
+   ## Actions Taken
+   1. Incident documented
+   2. Authentik access logs reviewed
+   3. Immutability trigger verified
+   4. [Preventive action]
+   
+   ## Compliance Impact
+   - Audit trail for $ENTITY versions is compromised
+   - Recommend manual review of $ENTITY history
+   - All future versions protected by restored trigger
+   EOF
+   
+   # Store in compliance folder
+   cp /tmp/compliance-report.md /var/log/poimen/compliance-incidents/
+   ```
+
+2. **Restore trigger and lock down**
+   ```bash
+   # Re-create immutability trigger
+   psql $DB -f crates/mem-store/migrations/007_versioning_schema.sql
+   
+   # Verify it worked
+   psql $DB -c "UPDATE memory_entity_version SET operation='test' LIMIT 1" || echo "Trigger working"
+   ```
+
+3. **Investigate root cause**
+   - Was trigger accidentally dropped?
+   - Was there an emergency maintenance window?
+   - Was there an accidental SQL injection?
+   - Was there a permission escalation?
+
+### Prevention
+
+- Immutability trigger on all audit tables
+- Regular trigger verification (weekly)
+- Authentik audit log retention (1 year)
+- Database role separation (no direct table updates)
+
+### Escalation
+
+After confirmation of compromise:
+```bash
+# Notify compliance/legal team
+notify compliance-team << EOF
+Audit chain integrity compromised for entity: $ENTITY
+See: /var/log/poimen/compliance-incidents/audit-chain-$(date +%Y-%m-%d).md
+EOF
+```
+
+---
+
+## Incident: Version Query Timeout
+
+**Severity**: MEDIUM | **Impact**: Slow audits | **SLO**: Latency p99 < 500ms
+
+### Detection
+
+Alert: `MemoryVersionLatencyHigh`
+Symptoms:
+- `GET /memory/entities/{id}/versions` takes > 500ms
+- Audit reports slow
+- Dashboard unresponsive
+
+### Investigation
+
+1. **Check query performance**
+   ```bash
+   # Explain the query
+   psql $DB << EOF
+   EXPLAIN ANALYZE
+   SELECT * FROM memory_entity_version
+   WHERE entity_id = 'e_kubernetes'
+   ORDER BY version_num DESC;
+   EOF
+   ```
+
+2. **Check index status**
+   ```bash
+   # Verify indexes exist and are healthy
+   psql $DB -c "SELECT schemaname, tablename, indexname FROM pg_indexes WHERE tablename LIKE 'memory_entity_version';"
+   
+   # Check if bloated
+   psql $DB -c "SELECT * FROM pgstattuple('memory_entity_version');"
+   ```
+
+### Resolution
+
+1. **If indexes missing or bloated**
+   ```bash
+   # Rebuild indexes
+   psql $DB << EOF
+   REINDEX TABLE memory_entity_version;
+   REINDEX TABLE memory_edge_version;
+   ANALYZE memory_entity_version;
+   ANALYZE memory_edge_version;
+   EOF
+   ```
+
+2. **If table too large, partition by entity_id**
+   ```bash
+   # Add range partition (future improvement)
+   # For now, truncate old versions
+   psql $DB << EOF
+   DELETE FROM memory_entity_version
+   WHERE changed_at < NOW() - INTERVAL '1 year';
+   EOF
+   ```
+
+---
+
+## Incident: Ranking Profile Not Working
+
+**Severity**: LOW | **Impact**: Search quality | **SLO**: None (feature)**
+
+### Detection
+
+Symptoms:
+- `GET /memory/ranking/profiles` returns empty
+- Query with `ranking_profile: "recency_focused"` returns 400
+- Ranking signals are all 0
+
+### Investigation
+
+1. **Check profile endpoint**
+   ```bash
+   curl -v http://localhost:8080/memory/ranking/profiles \
+     -H "Authorization: Bearer $TOKEN"
+   ```
+
+2. **Check signal computation in logs**
+   ```bash
+   kubectl logs -l app=memory -c worker -n poimen --tail=100 | grep -i signal
+   ```
+
+### Resolution
+
+1. **Restart ranking service**
+   ```bash
+   kubectl rollout restart deployment memory -n poimen
+   ```
+
+2. **Verify profiles loaded**
+   ```bash
+   curl http://localhost:8080/memory/ranking/profiles \
+     -H "Authorization: Bearer $TOKEN" | jq '.profiles | length'
+   # Should return 3
+   ```
+
+---
+
+## Routine: Daily Health Check
+
+Run every day at 1 AM UTC:
+
+```bash
+#!/bin/bash
+set -e
+
+TOKEN=$(get_jwt_token)
+API=http://localhost:8080
+
+echo "=== Daily Memory Health Check ==="
+
+# 1. Rebuild verification
+echo "1. Testing rebuild parity..."
+REBUILD=$(curl -s -X POST $API/memory/rebuild \
+  -H "Authorization: Bearer $TOKEN" \
+  -d '{"project":"poimen","verify":true}')
+
+MATCH=$(echo $REBUILD | jq -r '.checksum.match')
+if [ "$MATCH" != "true" ]; then
+  echo "❌ REBUILD PARITY FAILED"
+  echo $REBUILD | jq '.diff_summary'
+  exit 1
+fi
+echo "✅ Rebuild parity: OK"
+
+# 2. Audit chain
+echo "2. Testing audit chain..."
+AUDIT=$(curl -s http://localhost:8080/memory/audit/verify \
+  -H "Authorization: Bearer $TOKEN")
+
+VALID=$(echo $AUDIT | jq -r '.chain_valid')
+if [ "$VALID" != "true" ]; then
+  echo "❌ AUDIT CHAIN BROKEN"
+  exit 1
+fi
+echo "✅ Audit chain: OK"
+
+# 3. Latency check
+echo "3. Testing latency..."
+START=$(date +%s%N)
+curl -s $API/memory/entities/e_kubernetes/versions \
+  -H "Authorization: Bearer $TOKEN" > /dev/null
+END=$(date +%s%N)
+ELAPSED_MS=$(( (END - START) / 1000000 ))
+
+if [ $ELAPSED_MS -gt 500 ]; then
+  echo "⚠️  Version query slow: ${ELAPSED_MS}ms"
+else
+  echo "✅ Latency: OK (${ELAPSED_MS}ms)"
+fi
+
+# 4. Disk space
+echo "4. Checking disk..."
+USAGE=$(du -sh /var/lib/postgresql | cut -f1)
+echo "   Database size: $USAGE"
+
+echo ""
+echo "=== Health check complete ==="
+```
+
+---
+
+## SLO Compliance
+
+Monitor these daily:
+
+```promql
+# Availability
+memory:availability:slo >= 0.999
+
+# Latency
+memory:query:latency:p99 < 0.2
+memory:version:latency:p99 < 0.5
+
+# Consistency
+memory:rebuild:success_rate == 1.0
+memory:audit:chain_valid_rate == 1.0
+```
+
+If any SLO breached, escalate to on-call engineer.
+
+---
+
+## Contact
+
+- **On-call**: See PagerDuty schedule
+- **Slack**: #poimen-alerts
+- **Incident**: incident declare phase7-\*