[krishanth7]

Executive Summary

Phase 4.5 delivers the durable background job processing and asynchronous orchestration subsystem for DERA. Built upon PostgreSQL platform persistence (dera_jobs, dera_job_outbox) and distributed message queues (Celery/Redis), it provides at-least-once transactional outbox delivery, atomic Compare-And-Swap (CAS) worker claiming, workspace-scoped idempotency, and cooperative cancellation without introducing non-deterministic AI or remote code execution risks.

Primary Deliverables

1. Transactional Outbox Engine (apps/api/src/dera_api/jobs/dispatcher.py):
   • Atomically records outbox events with job insertion.
   • Dispatches events to Celery; handles broker outages and retry policies.
2. Worker Execution System (apps/api/src/dera_api/workers/):
   • Hardened Celery application: strict JSON serialization, acks_late=True, worker_prefetch_multiplier=1, zero pickle deserialization.
   • Atomic CAS claiming prevents duplicate concurrent claims across distributed workers.
   • Enforces execution deadlines and records diagnostic timeouts.
3. Allowlist Task Registry (apps/api/src/dera_api/jobs/registry.py):
   • Statically registers strongly typed tasks (system.health_probe.v1, system.noop.v1).
   • Rejects unallowlisted task invocations.
4. REST API Endpoints (apps/api/src/dera_api/api/v1/endpoints/jobs.py):
   • POST /api/v1/workspaces/{workspace_id}/jobs (requires job:create)
   • GET /api/v1/workspaces/{workspace_id}/jobs (requires job:read)
   • GET /api/v1/workspaces/{workspace_id}/jobs/{job_id} (requires job:read)
   • POST /api/v1/workspaces/{workspace_id}/jobs/{job_id}/cancel (requires job:cancel)
5. Database Persistence & Migrations:
   • Migration 003_jobs_and_orchestration.py introducing dera_jobs and dera_job_outbox.
6. Documentation & Quality Verification:
   • 12 comprehensive operational guides in docs/jobs/.
   • Acceptance audit in docs/audit/PHASE_4_5_JOBS_ACCEPTANCE.md.

Test Telemetry

• Total Tests Executed: 312
• Passed: 312
• Failures: 0
• Duration: 50.295s
• Linting & Formatting: 100% compliant with Ruff
• OpenAPI Schema Drift: 0 drift detected

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