feat: schedule pricing job retention cleanup

Schedule configurable completed pricing-job cleanup in the worker, broaden repository cleanup across sellers, add unit and integration coverage, and update pricing operational documentation.

apps/worker/tests/pricing-refresh-worker.test.js

@@ -6,10 +6,40 @@ import {
   createPricingProviderRegistry,
 } from "../../api/src/modules/pricing/providers/pricing-provider.js";
 import {
+  getPricingJobRetentionCutoff,
   processNextPersistentPricingRefreshJob,
+  purgeCompletedPricingRefreshJobs,
   runPricingRefreshJob,
 } from "../src/pricing-refresh-worker.js";
 
+test("calculates a UTC retention cutoff and purges completed jobs before it", async () => {
+  const now = new Date("2026-09-09T12:00:00.000Z");
+  const cutoff = getPricingJobRetentionCutoff({ now, retentionDays: 30 });
+  assert.equal(cutoff.toISOString(), "2026-08-10T12:00:00.000Z");
+
+  let receivedCutoff;
+  const deleted = await purgeCompletedPricingRefreshJobs({
+    jobRepository: {
+      async purgeCompletedBefore(value) {
+        receivedCutoff = value;
+        return 3;
+      },
+    },
+    now,
+    retentionDays: 30,
+  });
+
+  assert.equal(deleted, 3);
+  assert.equal(receivedCutoff.toISOString(), cutoff.toISOString());
+});
+
+test("rejects invalid pricing job retention days", () => {
+  assert.throws(
+    () => getPricingJobRetentionCutoff({ retentionDays: 0 }),
+    /positive integer/,
+  );
+});
+
 test("completes a pricing refresh through the provider and pricing service boundaries", async () => {
   const providerRegistry = createPricingProviderRegistry([
     createPricingProvider({