Follow one revision and request through build, proxy, application, and database layers before changing an old deployment pipeline.
Legacy frontend-backend deployments fail in layers. A React build can be correct while the proxy serves last week's files. Django can be healthy while /api routes to the wrong upstream. The database can be reachable from a shell and blocked from the application container.
Do not start by upgrading everything. Trace one revision and one request.
Stamp the build
Inject a revision into the frontend artifact and backend health response:
GET /version
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