CNPG's cluster-ro service already handles load balancing and failover,
so the application-level Vec + random_range is redundant.
- db_read: Vec<DatabaseConnection> → Option<DatabaseConnection>
- database_read_replicas returns Option<String> instead of Vec<String>
- health checks now explicitly ping both writer() and reader()
- remove unused rand dependency from libs/db
- sync/mod.rs: wrap scan_skills_from_dir in spawn_blocking to avoid
blocking the async executor; use to_path_buf() to get owned PathBuf
- pool/worker.rs: replace 500ms poll sleep with cancellation-is_cancelled
check (eliminates artificial latency); add exponential backoff on Redis
errors (1s base, 32s cap, reset on success)
- pool/redis.rs: add 5s timeout on pool.get() for all three methods
(next, ack_raw, nak_with_retry) to prevent indefinite blocking on
unresponsive Redis
- sync/gc.rs: add comment explaining why git gc --auto non-zero exit
is benign
- webhook_dispatch.rs: remove unnecessary format! wrappers in slog macros
- config/hook.rs: document max_concurrent intent (K8s operator/HPA, not
the single-threaded worker itself)
