Durable admission record for one application-owned checkout operation.
This row is committed before the provider boundary is crossed. Its primary key makes
concurrent requests for the same operation serialize at PostgreSQL: exactly one request may
initiate the provider call, while every duplicate observes an existing reservation. The
request fingerprint prevents one operation identity from being reused for different contents.
Durable admission record for one application-owned checkout operation.
This row is committed before the provider boundary is crossed. Its primary key makes concurrent requests for the same operation serialize at PostgreSQL: exactly one request may initiate the provider call, while every duplicate observes an existing reservation. The request fingerprint prevents one operation identity from being reused for different contents.