diff --git a/packages/backend/migration/1746813431123756-user-distinct-null.js b/packages/backend/migration/1746813431123756-user-distinct-null.js
new file mode 100644
index 0000000000..407c91067a
--- /dev/null
+++ b/packages/backend/migration/1746813431123756-user-distinct-null.js
@@ -0,0 +1,13 @@
+export class IndexUserNullDistinct1746813431756 {
+	name = 'Indexusernulldistinct1746813431756'
+
+	async up(queryRunner) {
+		await queryRunner.query(`DROP INDEX IF EXISTS "IDX_5deb01ae162d1d70b80d064c27"`);
+    await queryRunner.query(`CREATE UNIQUE INDEX "IDX_5deb01ae162d1d70b80d064c27" ON "user" ("usernameLower", "host") NULLS NOT DISTINCT`);
+	}
+
+	async down(queryRunner) {
+		await queryRunner.query(`DROP INDEX IF EXISTS "IDX_5deb01ae162d1d70b80d064c27"`);
+    await queryRunner.query(`CREATE UNIQUE INDEX "IDX_5deb01ae162d1d70b80d064c27" ON "user" ("usernameLower", "host") `);
+	}
+}