- Add partial unique index on (project_id, port) for active dev servers so the
SELECT-then-INSERT race can no longer create duplicate 'Port 3000' rows.
- Make startDevServer race-safe: on unique violation, adopt the winning row
instead of duplicating.
- ensure route no longer marks a server 'running' before it binds the port;
the readiness probe flips starting->running only after the port answers.
Kills the '502 -> broken CSS -> works' refresh loop.
- Deduplicate previews per-port in sortDevPreviewsFrontendFirst as a defensive
backstop for the dropdown.
- Revert iframe _refresh query-param hack (was forcing cold recompiles).
