Incident post-mortem adapted for an internal review
Incident review example with a timeline, root cause framing, and prevention actions.
Source input
Between 09:10 and 10:25 UTC, generation requests intermittently failed for signed-in users because the persistence layer returned 500s. Guest mode still worked more often because it bypassed some storage calls. 09:10 first alert from Sentry. 09:18 support reported user-facing failures. 09:26 team traced errors to a recent schema mismatch on generations insert. 09:48 rollback applied. 10:05 writes recovered. 10:25 monitoring stable. Need a cleaner release checklist for schema changes and better alerting when signed-in flows degrade but guest fallback still works.
Structured output
incident timeline
The incident began with write-path failures at 09:10 UTC, escalated through support confirmation, was traced to a schema mismatch, and stabilized after rollback by 10:25 UTC.
root cause
The likely root cause was a schema mismatch on the signed-in generation persistence path introduced by a recent change. Evidence is strong but should be confirmed in the final engineering review.
impact scope
Signed-in users experienced intermittent generation failures, while some guest flows degraded less severely because they did not depend on the same persistence path.
resolution steps
The team traced the issue, rolled back the incompatible change, validated restored writes, and monitored the system until stability returned.
prevention actions
Add schema-change verification to the release checklist, improve production checks for signed-in paths, and tighten alerting when persistence failures spike.
sign off
Engineering should confirm the final root cause and owner for each prevention action before the post-mortem is closed.