fix: add created_at and updated_at field to book loan model

loans/migrations/0003_bookloan_created_at_bookloan_updated_at.py

+# Generated by Django 5.0.7 on 2024-07-16 05:53
+
+import datetime
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('loans', '0002_alter_bookloan_loan_date'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='bookloan',
+            name='created_at',
+            field=models.DateTimeField(auto_now_add=True, default=datetime.datetime(2024, 7, 16, 5, 53, 54, 878346, tzinfo=datetime.timezone.utc)),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='bookloan',
+            name='updated_at',
+            field=models.DateTimeField(auto_now=True),
+        ),
+    ]

loans/models.py

@@ -11,3 +11,5 @@ class BookLoan(models.Model):
     loan_date = models.DateTimeField()
     due_date = models.DateTimeField()
     return_date = models.DateTimeField(blank=True, null=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)