Add message counting and date-bounded scrapes

media-scrape/test/run.ts

@@ -14,6 +14,7 @@ import { extractMedia } from "../src/extract.js";
 import { PuppetBackend } from "../src/puppet-backend.js";
 import { aspectCondition, resolutionCondition } from "../src/filter-presets.js";
 import { isNearLimit, planRetention } from "../src/retention.js";
+import { isoFromSnowflake, snowflakeFromIso } from "../src/snowflake.js";
 import { dirSizeBytes, listScrapes, ScrapeStore } from "../src/store.js";
 import type { CoreAttachment, CoreMessage } from "../src/types.js";
 
@@ -710,6 +711,50 @@ void (async () => {
         store.close();
     });
 
+    await test("snowflake helpers round-trip dates", () => {
+        const id = snowflakeFromIso("2026-09-16T00:00:00.000Z");
+        assert.ok(id);
+        assert.equal(isoFromSnowflake(id), "2026-09-16T00:00:00.000Z");
+        assert.equal(snowflakeFromIso("not a date"), null);
+        assert.equal(isoFromSnowflake("nope"), null);
+    });
+
+    await test("engine honors a from-date boundary", async () => {
+        const backend = new FakeBackend([
+            { messages: [message("1000"), message("900"), message("800")] }
+        ]);
+
+        const engine = new ScrapeEngine({
+            rootDir: root,
+            pageSize: 10,
+            pageMinMs: 0,
+            pageMaxMs: 0,
+            sleep: async () => {},
+            random: () => 0,
+            log: () => {},
+            previews: false
+        });
+
+        const started = await engine.start({
+            channelId: "131",
+            guildId: null,
+            mode: "links",
+            backend,
+            afterId: "900"
+        });
+        await engine.processQueue();
+
+        const meta = engine.get(started.id);
+        assert.equal(meta?.state, "done");
+        assert.equal(meta?.messages, 1);
+        assert.equal(meta?.afterId, "900");
+        assert.equal(backend.calls.length, 1);
+
+        const store = new ScrapeStore(join(root, started.id));
+        assert.equal(store.queryMedia({}).length, 0);
+        store.close();
+    });
+
     await test("retention marks the oldest completed scrapes up to the limit", () => {
         const scrapes = [
             { id: "old", state: "done", createdAt: "2026-09-01T00:00:00.000Z", bytes: 600 },