Run #3403

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Tu es un agent de monitoring du pool agencecom.

Lessons pertinentes:
LESSONS APPRISES PERTINENTES :
- L453-HUB: Health endpoints K8s : separer liveness no-DB / readiness DB-1s alert / startup cached
- L328-CROSS-S150-blocD2-deploy: Bloc D2 cache layer DEPLOYED Sprint 2 P2 — REUSE Redis 7.0.15 BSD existing Contabo (skip Valkey doublon) + smoke 5/5 PASS via /api/memory/cache/health endpoint dedie
- L-S199-LL2-V52-SPEC-REVIEW: L-S199-LL2 — Review V5.2 Monitoring spec (3 BLOCKERS + 15 medium + 5 low = 23 findings, GO sous condition)
- L-S199-CROSS-V52-SPEC-DRAFTED: L-S199-CROSS-V52-SPEC-DRAFTED — V5.2 Monitoring event-driven spec push DB
- L-S189-LL2-observateur-recap: L-S189-LL2 — Observateur PHASE 1 recap 13+ cycles SILENT + cron clôture

Donnees pool actuelles:
[missing:pool_status]

CONTRAINTE STRICTE -- Tables autorisees UNIQUEMENT :
- agencecom.agents (id, name, agent_level, status, current_session_id, error_count_last_hour, total_sessions, total_errors, total_cost_usd, quarantined_until, acquired_at, last_released_at)
- agencecom.agent_task_runs (id, agent_id, status, started_at, completed_at, error_message, llm_tokens_in, llm_tokens_out, cost_usd, validation_result)

Toute autre table (v_agents_critical, agent_pool, healthcheck_config, error_log, file_locks, zombie_agents, agent_audit, v_agent_timeout_health, v_agents_timeout_risk, agent_health_log, redis_health_ping, auto_quarantine, missions, health_checks, agent_health, internal) NEXISTE PAS -- ne reference jamais de table absente de cette liste.

Identifie les agents zombies (busy >1h sans completion via started_at + status), error_count_last_hour > 5, ou drift quarantine (quarantined_until > now).
Donne 3 recommandations concretes en markdown bullet points avec actions SQL utilisant SEULEMENT les 2 tables autorisees ci-dessus.

```markdown
- **Détection des agents zombies (>1h sans completion)**  
  Identifier les agents avec `status = 'busy'` dont la dernière exécution de tâche a démarré il y a plus d’une heure sans jamais se terminer (`completed_at IS NULL`).  
  ```sql
  SELECT a.id, a.name, r.started_at, r.status AS task_status
  FROM agencecom.agents a
  JOIN LATERAL (
    SELECT started_at, completed_at, status
    FROM agencecom.agent_task_runs r
    WHERE r.agent_id = a.id
    ORDER BY started_at DESC
    LIMIT 1
  ) r ON true
  WHERE a.status = 'busy'
    AND r.started_at < NOW() - INTERVAL '1 hour'
    AND r.completed_at IS NULL;
  ```
  Action recommandée : libérer les agents identifiés après vérification manuelle.  
  ```sql
  UPDATE agencecom.agents
  SET status = 'idle', last_released_at = NOW()
  WHERE id IN (
    SELECT a.id
    FROM agencecom.agents a
    JOIN LATERAL (
      SELECT started_at, completed_at
      FROM agencecom.agent_task_runs r
      WHERE r.agent_id = a.id
      ORDER BY started_at DESC
      LIMIT 1
    ) r ON true
    WHERE a.status = 'busy'
      AND r.started_at < NOW() - INTERVAL '1 hour'
      AND r.completed_at IS NULL
  );
  ```

- **Détection des agents en erreur (error_count_last_hour > 5)**  
  Lister les agents dont le compteur d’erreurs sur la dernière heure dépasse le seuil, avant qu’ils ne saturent le pool.  
  ```sql
  SELECT id, name, agent_level, status, error_count_last_hour
  FROM agencecom.agents
  WHERE error_count_last_hour > 5;
  ```
  Action recommandée : mettre en quarantaine préventive pour 30 minutes (ajustable).  
  ```sql
  UPDATE agencecom.agents
  SET status = 'quarantined',
      quarantined_until = NOW() + INTERVAL '30 minutes'
  WHERE error_count_last_hour > 5
    AND status NOT IN ('quarantined');
  ```

- **Correction de la dérive de quarantaine (`quarantined_until` futur mais statut ≠ `quarantined`)**  
  Repérer les agents dont la date de fin de quarantaine est dans le futur mais qui ne sont pas marqués `quarantined` (incohérence d’état).  
  ```sql
  SELECT id, name, status, quarantined_until
  FROM agencecom.agents
  WHERE quarantined_until > NOW()
    AND status != 'quarantined';
  ```
  Action recommandée : resynchroniser le statut pour refléter la quarantaine active.  
  ```sql
  UPDATE agencecom.agents
  SET status = 'quarantined'
  WHERE quarantined_until > NOW()
    AND status != 'quarantined';
  ```
```