fix: allow repeated platform checks and unify Alpha metric formatting

backend/app/submission.py

@@ -359,4 +359,7 @@ async def run_check(runner, job_id, payload):
             setattr(alpha, key, value)
         db.add(JobItem(job_id=job_id, alpha_id=alpha_id))
         job.processed = 1
-        job.checkpoint = {"alpha_id": alpha_id, "phase": "checked", "checked_at": now().isoformat()}
+        job.checkpoint = {
+            "alpha_id": alpha_id, "phase": "checked", "checked_at": now().isoformat(),
+            "review_snapshot": fingerprint(source(alpha.raw)),
+        }

backend/tests/test_submission_repeat.py

@@ -0,0 +1,23 @@
+"""A completed check can be repeated using its resulting review snapshot."""
+
+from tests.test_submission import FIELDS, Description, setup
+
+
+async def test_repeat_check_uses_resulting_snapshot_without_repatch(app, logged_in):
+    platform = await setup(app)
+    url = "/api/v1/alphas/alpha1/submission"
+    state = (await logged_in.get(url)).json()
+    job_ids = []
+    for _ in range(2):
+        response = await logged_in.post("/api/v1/alphas/alpha1/submission-check", json={
+            "snapshot": state["snapshot"], "descriptions": {"regular": Description(**FIELDS).text()},
+        })
+        assert response.status_code == 202
+        job_ids.append(response.json()["id"])
+        await app.state.runner.execute(job_ids[-1])
+        state = (await logged_in.get(url)).json()
+        assert state["job"]["status"] == "completed"
+        assert state["job"]["checkpoint"]["review_snapshot"] == state["snapshot"]
+    assert job_ids[0] != job_ids[1]
+    assert len(platform.patches) == 1
+    assert platform.calls.count(("GET", "/alphas/alpha1/check")) == 2