Module query_registry 

Query registry — process-level query identity and cancellation.

Every query execution must first obtain a unique, non-zero QueryId from the QueryRegistry. The registry also holds the unified cancellation source, deadline, and weak handles so that KILL QUERY works regardless of which layer initiated cancellation.

Structs

CancelToken

Thread-safe token that tracks whether a query was cancelled and why.

QueryGuard

RAII guard that unregisters a query from the registry on drop.

QueryId

Typed, non-zero query identifier.

QueryMetadata

Metadata stored in the registry for each active query.

QueryRegistry

Process-level query registry.