The bug that taught me how to run one process per user

Short summary

Process manager lost track of user workers on restart because state was in-memory only. Solution: persist registry and verify processes by PID + start time, handling Linux zombie processes. Author released WorkerDeck, an open-source library for robust process-per-user lifecycle management.

• •Process manager stored worker state only in memory, losing it on restart
• •Solution: persist registry and verify processes by PID plus start time to prevent duplicates
• •MIT-licensed WorkerDeck library implements safe start/stop/restart with self-healing

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