feat: cashu escrow DB helpers — Cashu foundation CF-4#797
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Cashu foundation CF-4 (docs/cashu/01-fundamentals.md, section 6): - update_order_cashu_escrow: atomic compare-and-set that persists the three cashu_* columns AND advances the status in one UPDATE guarded by 'WHERE id = ? AND status = ? AND cashu_escrow_locked_at IS NULL' — no lock-without-advance window, replay/race safe; returns whether a row matched. - find_locked_cashu_orders: WHERE cashu_escrow_locked_at IS NOT NULL, deliberately without a status predicate (the CAS advances status in the same write as the lock, so a status filter would skip legitimately locked rows that moved on). Columns already exist on main (20260530120000_cashu_escrow_fields.sql); no schema change. New, unreferenced functions — no behaviour change. Tests: CAS locks once + replay is a no-op preserving the original lock; status mismatch matches zero rows leaving columns untouched; the finder includes locked orders regardless of status (e.g. FiatSent) and excludes unlocked ones. 506 tests pass (503 pre-existing + 3 new).
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Summary
CF-4 of the Cashu foundation (
docs/cashu/01-fundamentals.md§6). Additive query helpers over the already-migratedcashu_*columns; new, unreferenced functions — zero behaviour change. Frozen-contract signatures from §10 of the spec.update_order_cashu_escrow(pool, order_id, mint_url, token, locked_at, expected_status, new_status) -> Result<bool>— atomic compare-and-set: persists the three columns and transitions the status in oneUPDATE … WHERE id = ? AND status = ? AND cashu_escrow_locked_at IS NULL. No lock-without-advance window; a replayed or concurrent submission matches zero rows instead of double-writing.find_locked_cashu_orders(pool)—WHERE cashu_escrow_locked_at IS NOT NULL, deliberately without a status predicate: the CAS advances the status in the same write as the lock, so filtering on a status would skip legitimately locked rows that already moved on (per the spec's design note, incl. the M-1 review fix).No migration ships here — the columns landed on
mainin20260530120000_cashu_escrow_fields.sql.Test plan
cargo fmt --allcargo clippy --all-targets --all-features -- -D warningscargo test— 506 passed (503 pre-existing unmodified + 3 new):NULLFiatSent→ still found) and excludes unlocked onesIndependent Wave-1 PR of the CF-0…CF-5 series (CF-0 #795, CF-1 #796). Remaining: CF-2 (CashuClient/cdk), CF-3 (mint harness), CF-5 (integration, last).