Fix live outage: migrate DB from Aiven trial to TiDB Cloud + pom cleanup - #10
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Aiven's free MySQL is a 30-day trial; when it lapsed the service (and its DNS host) was deleted, so the Render backend crash-looped on boot with UnknownHostException / 'Communications link failure' -> exit status 1. Switch DEPLOYMENT.md and README to TiDB Cloud Serverless (MySQL 8-wire compatible, free forever, auto-resumes from idle) and document the trap.
Drop the hardcoded 1.20.1 on the three org.testcontainers deps so they inherit the parent-managed version (1.21.4), keeping the testcontainers modules consistent and clearing the 'overrides managed version' warnings.
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Why
The live backend on Render was crash-looping (
Exited with status 1). Root cause: the Aiven MySQL service was deleted when its 30-day free trial lapsed — its DNS host no longer resolves, so Spring Boot fails at boot withUnknownHostException/Communications link failureduring Flyway init.What changed
1.20.1; inherit the Spring Boot BOM version (1.21.4) so the three testcontainers modules stay consistent.Verification
Live backend is back up after repointing Render's
SPRING_DATASOURCE_*env vars at TiDB:No application code changed; schema rebuilt cleanly via Flyway V1–V6 on the fresh DB.