This is a follow-up to the issue described in GATEWAY RETURNS "ROUTE NOT FOUND" FOR ALL ROUTES AFTER UPDATING TO V2025.10.3 #3899.

After being unable to resolve the "Route not found" issue in version 2025.10.3, I attempted to restore a backup of a previously working version (2025.7.4, commit: 9b8844b). However, I am still unable to get the application running.

Symptoms

• The gateway service fails to start.
• The gateway logs show a repeating error related to a database migration:

ERROR tensorzero_core::clickhouse::migration_manager: Failed migration success check: Migration0028
ERROR tensorzero_core::error: Error running ClickHouse migration Migration0028: Migration success check failed
ERROR gateway: Failed to initialize AppState: Error running ClickHouse migration Migration0028: Migration success check failed

• The ui service logs show the following errors:

[TensorZero UI v2025.7.4] Failed to fetch TensorZero status: TypeError: fetch failed
[cause]: Error: getaddrinfo ENOTFOUND gateway

[TensorZero UI v2025.7.4] Failed to fetch TensorZero status: TypeError: fetch failed
[cause]: Error: connect ECONNREFUSED 172.19.0.3:3000

Troubleshooting Steps Taken

1. Restored a backup of the tensorzero directory.
2. Ran docker-compose build to rebuild the Docker images from the restored source code.
3. Corrected the docker-compose.yml file to include the command: [ "--config-file", "/app/config/tensorzero.toml" ] for the gateway service.
4. Attempted to roll back the failing database migration by dropping the StaticEvaluationFloatHumanFeedbackView, StaticEvaluationBooleanHumanFeedbackView, and StaticEvaluationHumanFeedback tables/views as per the rollback instructions in the logs.
5. Restarted the services multiple times using docker-compose up -d --force-recreate.

Despite these efforts, the Migration0028 error persists, which prevents the gateway from starting and leads to the networking errors in the UI.

It appears there is a bug in the database migration logic in version 2025.7.4 that is preventing the application from starting, even from a supposedly good backup.