diff --git a/src/db/migrations/038_push_subscriptions.ts b/src/db/migrations/038_push_subscriptions.ts
index c3fa95e9..ecce1b1f 100644
--- a/src/db/migrations/038_push_subscriptions.ts
+++ b/src/db/migrations/038_push_subscriptions.ts
@@ -13,6 +13,13 @@ export async function up(db: Kysely<any>): Promise<void> {
     .addColumn('created_at', 'timestamp', (c) => c.notNull().defaultTo(sql`CURRENT_TIMESTAMP`))
     .addColumn('updated_at', 'timestamp', (c) => c.notNull().defaultTo(sql`CURRENT_TIMESTAMP`))
     .execute();
+
+  await db.schema
+    .createIndex('push_subscriptions_token_hash_idx')
+    .on('push_subscriptions')
+    .column('token_hash')
+    .unique()
+    .execute();
 }
 
 export async function down(db: Kysely<any>): Promise<void> {