Function run_staged 

pub async fn run_staged(
    pool: &PgPool,
    vault: &Vault,
    actor: &Actor,
    id: Uuid,
) -> AppResult<ImportResult>

Runs a staged import and removes the upload (a second click finds nothing).

Invariants

• Permission: as run; the staged upload must belong to the actor (otherwise “not found”, like a used or expired one).
• Locks: the staged row (FOR UPDATE), then those of run.
• Audit / notifications / webhooks: as run.
• Atomic: one transaction: the import and the removal of the staged upload commit together, so a second click finds nothing.