diff --git a/server/migration/postgres/1765233385034-AddUniqueConstraintToPushSubscription.ts b/server/migration/postgres/1765233385034-AddUniqueConstraintToPushSubscription.ts
index af245cfd..bcb79d45 100644
--- a/server/migration/postgres/1765233385034-AddUniqueConstraintToPushSubscription.ts
+++ b/server/migration/postgres/1765233385034-AddUniqueConstraintToPushSubscription.ts
@@ -6,6 +6,15 @@ export class AddUniqueConstraintToPushSubscription1765233385034
   name = 'AddUniqueConstraintToPushSubscription1765233385034';
 
   public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      DELETE FROM "user_push_subscription"
+      WHERE id NOT IN (
+        SELECT MAX(id)
+        FROM "user_push_subscription"
+        GROUP BY "endpoint", "userId"
+      )
+    `);
+
     await queryRunner.query(
       `ALTER TABLE "user_push_subscription" ADD CONSTRAINT "UQ_6427d07d9a171a3a1ab87480005" UNIQUE ("endpoint", "userId")`
     );
diff --git a/server/migration/sqlite/1765233385034-AddUniqueConstraintToPushSubscription.ts b/server/migration/sqlite/1765233385034-AddUniqueConstraintToPushSubscription.ts
index 48a8c6d6..c0ef0fc5 100755
--- a/server/migration/sqlite/1765233385034-AddUniqueConstraintToPushSubscription.ts
+++ b/server/migration/sqlite/1765233385034-AddUniqueConstraintToPushSubscription.ts
@@ -6,6 +6,15 @@ export class AddUniqueConstraintToPushSubscription1765233385034
   name = 'AddUniqueConstraintToPushSubscription1765233385034';
 
   public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      DELETE FROM "user_push_subscription"
+      WHERE id NOT IN (
+        SELECT MAX(id)
+        FROM "user_push_subscription"
+        GROUP BY "endpoint", "userId"
+      )
+    `);
+
     await queryRunner.query(
       `CREATE UNIQUE INDEX "UQ_6427d07d9a171a3a1ab87480005" ON "user_push_subscription" ("endpoint", "userId")`
     );