ssh key저장 기능 추가

users/migrations/0005_customuser_last_used_at.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.14 on 2025-05-20 03:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0004_customuser_encrypted_private_key'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='customuser',
+            name='last_used_at',
+            field=models.DateTimeField(blank=True, null=True, verbose_name='SSH 키 마지막 사용 시각'),
+        ),
+    ]