2024 Linear — production database migration error caused multi-hour window of workspace data loss; most data restored from backup
Data compromised
Customer workspace records active during the incident window until restoration—not a traditional external intrusion.
Technical writeup
Linear published a detailed post-mortem describing a failed production migration that cascaded deletes in Postgres, prompting maintenance mode and backup restoration; the company summarized prevention changes around migration review and database privileges.
Root cause
Missed cascade semantics in a database migration deployed to production (per Linear incident write-up).