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Celery worker was OOM-killed (41 restarts) at 512MB with 4 concurrent workers. Reduce concurrency to 2, increase worker limit to 768MB, and reclaim memory from over-provisioned services (db 512→256, beat 256→128, flower 256→192). Total allocation stays within 4GB server budget. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>