diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 588677e9..4ee70733 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.20.28",
+    "version": "2.20.29",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index 03085460..185c9d40 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -385,6 +385,13 @@ export async function edit(
     return await document.set(domainId, type, tid, $set);
 }
 
+export async function del(domainId: string, tid: ObjectID, type: Type = document.TYPE_CONTEST) {
+    await Promise.all([
+        document.deleteOne(domainId, type, tid),
+        document.deleteMultiStatus(domainId, type, { docId: tid }),
+    ]);
+}
+
 export async function get(domainId: string, tid: ObjectID, type: -1): Promise<Tdoc<30 | 60>>;
 export async function get<T extends Type>(domainId: string, tid: ObjectID, type: T): Promise<Tdoc<T>>;
 export async function get(domainId: string, tid: ObjectID): Promise<Tdoc<30>>;
@@ -601,6 +608,7 @@ global.Hydro.model.contest = {
     getMultiStatus,
     attend,
     edit,
+    del,
     get,
     updateStatus,
     getStatus,
diff --git a/packages/hydrooj/src/model/training.ts b/packages/hydrooj/src/model/training.ts
index a6747597..2707f58d 100644
--- a/packages/hydrooj/src/model/training.ts
+++ b/packages/hydrooj/src/model/training.ts
@@ -50,6 +50,13 @@ export function edit(domainId: string, tid: ObjectID, $set: Partial<TrainingDoc>
     return document.set(domainId, document.TYPE_TRAINING, tid, $set);
 }
 
+export function del(domainId: string, tid: ObjectID) {
+    return Promise.all([
+        document.deleteOne(domainId, document.TYPE_TRAINING, tid),
+        document.deleteMultiStatus(domainId, document.TYPE_TRAINING, { docId: tid }),
+    ]);
+}
+
 export function getPids(dag: TrainingNode[]) {
     return Array.from(new Set(flatten(dag.map((node) => node.pids))));
 }
@@ -117,6 +124,7 @@ global.Hydro.model.training = {
     isInvalid,
     add,
     edit,
+    del,
     count,
     get,
     getList,