Struct StoreCtx 

pub struct StoreCtx<'a> {
    pub tenant: Uuid,
    pub scope: &'a AccessScope,
    pub subject: Subject,
    pub snapshot: Option<&'a ReadSnapshot>,
    pub budget: RemainingBudget,
    pub cancel: CancellationToken,
}

Per-call context. The compiled scope is mandatory, not optional: authorization has to reach inside the statements (a search arm applies it before ranking and LIMIT), so it cannot be a filter the gear applies to whatever the plugin returns.

scope living here rather than in a per-method argument is what makes the request-level decline possible: an implementation inspects the compiled scope it is about to serve and may answer ScopeUnservable instead of a result, which the gateway resolves by falling back. It is a routing signal, not a failure, and it never reaches the caller.

Fields

tenant: Uuid

scope: &'a AccessScope

subject: Subject

The acting subject, stamped onto the audit envelope of every element a write in this call creates, updates or tombstones (fr-audit-envelope).

snapshot: Option<&'a ReadSnapshot>

Present when the call participates in a compound read that must observe one graph state (Read Consistency Contract).

budget: RemainingBudget

What is left of the operation’s absolute deadline.

cancel: CancellationToken