diff --git a/packages/hydrooj/src/model/document.ts b/packages/hydrooj/src/model/document.ts
index 12b5f8329..647984ade 100644
--- a/packages/hydrooj/src/model/document.ts
+++ b/packages/hydrooj/src/model/document.ts
@@ -317,14 +317,14 @@ export async function setMultiStatus<K extends keyof DocStatusType>(
     );
 }
 
-export async function setStatusIfNotCondition<T extends keyof DocStatusType>(
+export async function setStatusIfCondition<T extends keyof DocStatusType>(
     domainId: string, docType: T, docId: DocStatusType[T]['docId'], uid: number,
     filter: Filter<DocStatusType[T]>, args: Partial<DocStatusType[T]> = {},
     returnDocument: 'before' | 'after' = 'after',
 ): Promise<DocStatusType[T]> {
     try {
         return await collStatus.findOneAndUpdate(
-            { domainId, docType, docId, uid, $nor: [filter] },
+            { domainId, docType, docId, uid, ...filter },
             { $set: args },
             { upsert: true, returnDocument },
         );
@@ -338,8 +338,8 @@ export async function setIfNotStatus<T extends keyof DocStatusType, K extends ke
     key: K, value: DocStatusType[T][K], ifNot: DocStatusType[T][K], args: Partial<DocStatusType[T]>,
     returnDocument: 'before' | 'after' = 'after',
 ): Promise<DocStatusType[T]> {
-    return await setStatusIfNotCondition(
-        domainId, docType, docId, uid, { [key]: ifNot } as any,
+    return await setStatusIfCondition(
+        domainId, docType, docId, uid, { [key]: { $ne: ifNot } } as any,
         { [key]: value, ...args }, returnDocument,
     );
 }
@@ -474,7 +474,7 @@ global.Hydro.model.document = {
     revSetStatus,
     set,
     setIfNotStatus,
-    setStatusIfNotCondition,
+    setStatusIfCondition,
     setStatus,
     setMultiStatus,
     setSub,
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index 8f73353b2..e90c1aabd 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -420,10 +420,10 @@ export class ProblemModel {
         domainId: string, pid: number, uid: number,
         rid: ObjectId, status: number, score: number,
     ) {
-        const filter: Filter<ProblemStatusDoc> = { rid: { $ne: rid }, status: STATUS.STATUS_ACCEPTED };
-        const res = await document.setStatusIfNotCondition(
+        const condition = status === STATUS.STATUS_ACCEPTED ? {} : { status: { $ne: STATUS.STATUS_ACCEPTED } };
+        const res = await document.setStatusIfCondition(
             domainId, document.TYPE_PROBLEM, pid, uid,
-            filter, { rid, status, score },
+            condition, { rid, status, score },
         );
         return !!res;
     }
diff --git a/packages/hydrooj/src/model/record.ts b/packages/hydrooj/src/model/record.ts
index a1114a8fb..da19759e8 100644
--- a/packages/hydrooj/src/model/record.ts
+++ b/packages/hydrooj/src/model/record.ts
@@ -15,6 +15,7 @@ import { ArgMethod, buildProjection, Time } from '../utils';
 import { STATUS } from './builtin';
 import DomainModel from './domain';
 import problem from './problem';
+import * as SystemModel from './system';
 import task from './task';
 
 export default class RecordModel {
@@ -291,6 +292,14 @@ export async function apply(ctx: Context) {
     ctx.on('domain/delete', (domainId) => RecordModel.coll.deleteMany({ domainId }));
     ctx.on('record/judge', async (rdoc, updated) => {
         if (rdoc.status === STATUS.STATUS_ACCEPTED && updated) {
+            if (SystemModel.get('record.statMode') === 'unique') {
+                await RecordModel.collStat.deleteMany({
+                    _id: { $ne: rdoc._id },
+                    uid: rdoc.uid,
+                    pid: rdoc.pid,
+                    domainId: rdoc.domainId,
+                });
+            }
             await RecordModel.collStat.updateOne({
                 _id: rdoc._id,
             }, {
diff --git a/packages/hydrooj/src/model/setting.ts b/packages/hydrooj/src/model/setting.ts
index a4d2de59b..1c869829d 100644
--- a/packages/hydrooj/src/model/setting.ts
+++ b/packages/hydrooj/src/model/setting.ts
@@ -334,6 +334,7 @@ SystemSetting(
     Setting('setting_basic', 'discussion.nodes', builtin.DEFAULT_NODES, 'yaml', 'discussion.nodes', 'Discussion Nodes'),
     Setting('setting_basic', 'problem.categories', builtin.CATEGORIES, 'yaml', 'problem.categories', 'Problem Categories'),
     Setting('setting_basic', 'training.enrolled-users', true, 'boolean', 'training.enrolled-users', 'Show enrolled users for training'),
+    Setting('setting_basic', 'record.statMode', 'unique', 'text', 'record.statMode', 'Record stat mode'),
     Setting('setting_basic', 'pagination.problem', 100, 'number', 'pagination.problem', 'Problems per page'),
     Setting('setting_basic', 'pagination.contest', 20, 'number', 'pagination.contest', 'Contests per page'),
     Setting('setting_basic', 'pagination.discussion', 50, 'number', 'pagination.discussion', 'Discussions per page'),