SQLite engine: queues — Queue/JobHandle over the writer slot, engine-side backoff curve, extent guard (task sqlite-engine-queues)
queue.rs: SqliteQueueHandle (QueueOpts-carrying, stamp-resolving
enqueue over the seam's shared resolution arithmetic), claim_one/
claim_batch through the writer slot with ADR-023 §2's extent guard
(n <= 0 -> empty Vec at the trait-impl entry), the full JobHandle impl
(one-shot ack/retry/fail as 'static boxed futures, repeatable absolute
reset heartbeat, substrate's uniform validity predicate), and the
engine-owned equal-jitter exponential backoff (std-only RandomState
hash jitter, integerized inclusive [ceil(half), cap], 1-hour cap;
no rand dep - documented).
ack_batch loses its substrate worker filter (register D-31 - ADR-019
§1's worker-less batch form); job_from_json decode + stamps_with_
override moved to their one owners (queue.rs / resolution.rs);
reader-pool helpers lifted from stream.rs into seam.rs. Store::queue
wired; 10 acceptance tests (lifecycle/stamps, extent guard,
exactly-once under concurrency, backoff range + cap + override,
validity predicate + reclaim, dead-letter defaults + get_job
visibility, cancel, ack_batch, sweep both-states + retention,
validation + closed-store). Workspace 25+3+171 green, clippy
-D warnings, fmt clean; sqlite suite 4x green.
glm-5.3-flash
513df0b311