fix: adopt rotated database leases

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02b22-9638-76d2-bbff-b7ea1770b118

README.md

@@ -22,10 +22,14 @@ SQLite through `SBOM_NEXUS_DATABASE_PATH`; production uses
 `SBOM_NEXUS_DATABASE_URL_FILE=/var/run/secrets/.../url` and `make migrate`.
 The direct `SBOM_NEXUS_DATABASE_URL` variable remains available for disposable
 development environments; mounted secret files are preferred for production.
+The runtime rereads the mounted file for every new database connection and
+recycles pooled connections every 300 seconds by default, configurable with
+`SBOM_NEXUS_DATABASE_POOL_RECYCLE_SECONDS`.
 
 ## Initial API surface
 
 - `GET /state/health`
+- `GET /state/live`
 - `PUT /repositories/{repo_slug}`
 - `GET /sbom/catch-up?limit=3`
 - `POST /sbom/{repo_slug}/ingest`