diff --git a/packages/hydrojudge/src/testlib.ts b/packages/hydrojudge/src/testlib.ts
index de824998..07a90bed 100644
--- a/packages/hydrojudge/src/testlib.ts
+++ b/packages/hydrojudge/src/testlib.ts
@@ -6,7 +6,7 @@ export function parse(output: string, fullscore: number) {
     let status = STATUS.STATUS_WRONG_ANSWER;
     let score = 0;
     let builder = (msg: string) => msg;
-    let message = output.substring(0, 1024);
+    let message = `${output.substring(0, 1024)} `;
     if (output.startsWith('ok ')) {
         status = STATUS.STATUS_ACCEPTED;
         score = fullscore;
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 6893b8cc..7893a45c 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "4.2.14",
+    "version": "4.2.15",
     "bin": "bin/hydrooj.js",
     "main": "src/plugin-api",
     "module": "src/plugin-api",
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index 075daa32..e20b9f3b 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -22,7 +22,8 @@ const validatePenaltyRules = (input: string) => yaml.load(input);
 const convertPenaltyRules = validatePenaltyRules;
 
 class HomeworkMainHandler extends Handler {
-    async get({ domainId, page = 1 }) {
+    @param('page', Types.PositiveInt, true)
+    async get(domainId: string, page = 1) {
         const cursor = contest.getMulti(domainId, { rule: 'homework' });
         const [tdocs, tpcount] = await paginate<Tdoc>(cursor, page, system.get('pagination.contest'));
         const calendar = [];
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index 2f12dd5c..7a05e1a4 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -181,13 +181,12 @@ const acm = buildContestRule({
                     docType: document.TYPE_CONTEST,
                     docId: tdoc.docId,
                     accept: { $gte: 1 },
-                    detail: { $elemMatch: { status: STATUS.STATUS_ACCEPTED } },
                 },
             },
-            { $unwind: '$detail' },
-            { $match: { 'detail.status': STATUS.STATUS_ACCEPTED } },
-            { $sort: { 'detail.rid': 1 } },
-            { $group: { _id: '$detail.pid', first: { $first: '$detail.rid' } } },
+            { $project: { r: { $objectToArray: '$detail' } } },
+            { $unwind: '$r' },
+            { $match: { 'r.v.status': STATUS.STATUS_ACCEPTED } },
+            { $group: { _id: '$r.v.pid', first: { $min: '$r.v.rid' } } },
         ]).toArray() as any[];
         for (const t of data) first[t._id] = t.first.generationTime;
 
diff --git a/packages/ui-default/backendlib/misc.ts b/packages/ui-default/backendlib/misc.ts
index 5f345f65..cdf6a46c 100644
--- a/packages/ui-default/backendlib/misc.ts
+++ b/packages/ui-default/backendlib/misc.ts
@@ -13,7 +13,7 @@ export function ansiToHtml(str: string, whiteToBlack = true) {
 
 export function datetimeSpan(dt: Date | ObjectID, relative = true, format = 'YYYY-M-D H:mm:ss', tz = 'Asia/Shanghai') {
   if (!dt) return 'DATETIME_SPAN_ERROR';
-  if (dt instanceof ObjectID) dt = new Date(dt.generationTime * 1000);
+  if (dt instanceof ObjectID) dt = dt.getTimestamp();
   else if (typeof dt === 'string' && ObjectID.isValid(dt)) dt = new Date(new ObjectID(dt).generationTime * 1000);
   else if (typeof dt === 'number' || typeof dt === 'string') dt = new Date(dt);
   return '<span class="time{0}" data-timestamp="{1}">{2}</span>'.format(
diff --git a/packages/ui-default/components/monaco/languages/yaml.ts b/packages/ui-default/components/monaco/languages/yaml.ts
index 46d7bfc3..fe9faede 100644
--- a/packages/ui-default/components/monaco/languages/yaml.ts
+++ b/packages/ui-default/components/monaco/languages/yaml.ts
@@ -99,7 +99,7 @@ setDiagnosticsOptions({
       schema: problemConfigSchema as any,
     },
     {
-      uri: '/manage/config/schema.json',
+      uri: new URL('/manage/config/schema.json', window.location.href).toString(),
       fileMatch: ['hydro://system/setting.yaml'],
     },
   ],