Module client 

Backend PostgreSQL client.

Originates simple-query SQL against a backend node. Frames every message through the existing crate::protocol types so we keep a single wire-protocol implementation in the crate.

The code path here is distinct from ProxyServer::route_and_forward, which forwards client frames. That path remains zero-copy; this path is for internal TR management queries (health check, pg_is_in_recovery(), pg_promote(), WAL-position probes, failover replay, session-state restoration).

Structs

BackendClient

An established, authenticated client connection to a backend.

BackendConfig

Backend connection parameters.

ColumnMeta

QueryResult