feat: apply search release plans atomically (Closes #817)

tests/test_issue_api.py

@@ -215,6 +215,81 @@ async def test_gitea_milestone_update_revalidates_assignment_and_open_repository
     }
 
 
+@pytest.mark.anyio
+@pytest.mark.parametrize("due_date", ["2026-08-31T23:59:59Z", None])
+async def test_release_plan_applies_milestone_and_optional_deadline_in_one_patch(due_date):
+    requests = []
+    existing_due_date = "2026-08-20T23:59:59Z"
+
+    async def handler(request):
+        requests.append(request)
+        if request.url.path == "/api/v1/user":
+            return httpx.Response(200, json={"login": "timmy"})
+        if request.method == "GET" and request.url.path.endswith("/issues/17"):
+            return httpx.Response(200, json={
+                "number": 17, "state": "open", "pull_request": None,
+                "assignees": [{"login": "timmy"}], "due_date": existing_due_date,
+            })
+        if request.method == "GET" and request.url.path.endswith("/milestones"):
+            return httpx.Response(200, json=[
+                {"id": 9, "title": "August RC", "state": "open"},
+            ])
+        return httpx.Response(200, json={
+            "number": 17, "state": "open",
+            "milestone": {"id": 9, "title": "August RC"},
+            "due_date": due_date or existing_due_date,
+        })
+
+    gitea_proxy.start_client(transport=httpx.MockTransport(handler))
+    try:
+        result = await gitea_proxy.update_assigned_issue_release_plan(
+            "stackchain/api", 17, 9, due_date
+        )
+    finally:
+        await gitea_proxy.stop_client()
+
+    patch_requests = [request for request in requests if request.method == "PATCH"]
+    assert len(patch_requests) == 1
+    expected_payload = {"milestone": 9}
+    if due_date:
+        expected_payload["due_date"] = due_date
+    assert json.loads(patch_requests[0].content) == expected_payload
+    assert result == {
+        "repository": "stackchain/api", "number": 17, "state": "open",
+        "milestone": {"id": 9, "title": "August RC"},
+        "due_date": due_date or existing_due_date,
+    }
+
+
+@pytest.mark.anyio
+async def test_release_plan_endpoint_is_bounded_and_returns_confirmed_plan(monkeypatch):
+    calls = []
+
+    async def update(repository, number, milestone_id, due_date):
+        calls.append((repository, number, milestone_id, due_date))
+        return {
+            "repository": repository, "number": number, "state": "open",
+            "milestone": {"id": milestone_id, "title": "August RC"},
+            "due_date": due_date,
+        }
+
+    monkeypatch.setattr(
+        main.gitea_proxy, "update_assigned_issue_release_plan", update, raising=False
+    )
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.patch(
+            "/api/v1/repos/stackchain/api/issues/17/release-plan",
+            json={"milestone_id": 9, "due_date": "2026-08-31T23:59:59Z"},
+        )
+
+    assert response.status_code == 200
+    assert response.headers["cache-control"] == "no-store"
+    assert response.json()["milestone"] == {"id": 9, "title": "August RC"}
+    assert response.json()["due_date"] == "2026-08-31T23:59:59Z"
+    assert calls == [("stackchain/api", 17, 9, "2026-08-31T23:59:59Z")]
+
+
 @pytest.mark.anyio
 async def test_milestone_routes_are_repository_bounded_and_no_store(monkeypatch):
     calls = []

tests/test_search_batch_plan.py

@@ -293,8 +293,9 @@ const fetchJson=(url,options={{}})=>{{
   calls.push({{url,method:options.method || 'GET',body:options.body ? JSON.parse(options.body) : null}});
   if (url.endsWith('/milestones')) return Promise.resolve([{{id:9,title:'August RC'}},{{id:7,title:'Old',state:'closed'}}]);
   const number=Number(url.split('/issues/')[1].split('/')[0]);
-  if (url.endsWith('/milestone')) return Promise.resolve({{number,milestone:{{id:9,title:'August RC'}}}});
-  if (url.endsWith('/due-date')) return Promise.resolve({{number,due_date:'2026-08-31T23:59:59Z'}});
+  if (url.endsWith('/release-plan')) return Promise.resolve({{
+    number,milestone:{{id:9,title:'August RC'}},due_date:'2026-08-31T23:59:59Z'
+  }});
   return Promise.resolve();
 }};
 const processorOptions=[];
@@ -346,16 +347,11 @@ listeners['plan-selected-search-results:click']().then(async()=>{{
             "due_date": "2026-08-31T23:59:59Z",
         },
     }
-    assert result["calls"][2:] == [
-        {
-            "url": "api/v1/repos/stackchain/dashboard/issues/815/milestone",
-            "method": "PATCH", "body": {"milestone_id": 9},
-        },
-        {
-            "url": "api/v1/repos/stackchain/dashboard/issues/815/due-date",
-            "method": "PATCH", "body": {"due_date": "2026-08-31T23:59:59Z"},
-        },
-    ]
+    assert result["calls"][2:] == [{
+        "url": "api/v1/repos/stackchain/dashboard/issues/815/release-plan",
+        "method": "PATCH",
+        "body": {"milestone_id": 9, "due_date": "2026-08-31T23:59:59Z"},
+    }]
     assert result["queued"] == "queued"
     assert result["journals"] == [
         "search-today-batch", "search-later-batch", "search-release-batch",