diff --git a/alter-tenant-id.sh b/alter-tenant-id.sh
new file mode 100644
index 0000000..5698e0f
--- /dev/null
+++ b/alter-tenant-id.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+cd packages/db
+node -e "
+const { Client } = require('pg');
+const url = process.env.DATABASE_URL.replace(/%21/g, '!');
+const c = new Client(url);
+c.connect().then(() => c.query('ALTER TABLE users ALTER COLUMN tenantId DROP NOT NULL'))
+  .then(() => { console.log('tenantId nullable OK'); return c.end(); })
+  .catch(e => { console.log('Error:', e.message.substring(0,100)); return c.end(); });
+"
+npx tsx prisma/seed.ts
diff --git a/src/comment/dto/create-comment.dto.bak b/src/comment/dto/create-comment.dto.bak
new file mode 100644
index 0000000..fdc01a5
--- /dev/null
+++ b/src/comment/dto/create-comment.dto.bak
@@ -0,0 +1,7 @@
+import { IsString, MinLength } from 'class-validator';
+
+export class CreateCommentDto {
+  @IsString()
+  @MinLength(1)
+  content!: string;
+}