280-Line Python Tool Sends SMS Alerts the Moment a SQL Migration Fails

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A developer built a lightweight Flask-based service after a failed production database migration went unnoticed for two hours, only surfacing when a user reported a 500 error. The 280-line open-source Python tool runs SQL schema migrations, rolls back any failed steps, and immediately sends an SMS to the on-call engineer via the Telnyx API. Unlike typical alerting systems, the service does not consider an alert sent until it receives and cryptographically verifies a signed delivery receipt from Telnyx. Webhook verification uses Ed25519 asymmetric signatures rather than the more common HMAC-SHA256, meaning only the public key needs to be distributed across services. The project is publicly available on GitHub under the Telnyx code examples repository.

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