# Migration Script Race Condition

- Provider: [Doppler](https://down.guide/providers/doppler)
- Confidence: Confirmed
- Impact: Major outage
- lasted 0m
- started 2020-02-06 23:43 UTC
- id: DWN-76b4d11750
- Official page: http://stspg.io/vm8mddpc2xg5

## Updates from Doppler
### 2020-02-06 23:43 UTC: resolved
We had a migration script that failed to run before the rest of our services deployed. This caused the newly deployed services to crash because the database was missing a column in a critical table. Our deployment orchestrator quickly detected the issue and reverted to the previous build. Total downtime was approximately 2 minutes.
We plan to mitigate future failures by requiring our migrations to complete before rolling out our remaining services.

From the builder: does your app depend on Doppler? [Sazabi](https://www.sazabi.com/?utm_source=down-guide&utm_medium=markdown&utm_content=doppler) detects problems in your own logs without hand-written monitors, and you can ask it in plain language which errors mention Doppler.

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