diff --git a/backend/src/migrations/1631474131804-AddIndexToIsBot.ts b/backend/src/migrations/1631474131804-AddIndexToIsBot.ts
new file mode 100644
index 00000000..db839d97
--- /dev/null
+++ b/backend/src/migrations/1631474131804-AddIndexToIsBot.ts
@@ -0,0 +1,21 @@
+import { MigrationInterface, QueryRunner, TableIndex } from "typeorm";
+
+export class AddIndexToIsBot1631474131804 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.createIndex(
+      "messages",
+      new TableIndex({
+        columnNames: ["is_bot"],
+      }),
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.dropIndex(
+      "messages",
+      new TableIndex({
+        columnNames: ["is_bot"],
+      }),
+    );
+  }
+}