feat: Attachment 모델 추가 및 관련 기능 구현

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

blog/migrations/0004_attachment.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.2.14 on 2026-01-20 13:58
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('blog', '0003_tag_post_tags'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Attachment',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('file', models.FileField(upload_to='attachments/%Y/%m/%d/')),
+                ('original_name', models.CharField(max_length=255)),
+                ('file_size', models.PositiveIntegerField()),
+                ('uploaded_at', models.DateTimeField(auto_now_add=True)),
+                ('post', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='attachments', to='blog.post')),
+            ],
+        ),
+    ]

blog/migrations/0005_attachment_uploader_id_attachment_uploader_name_and_more.py

@@ -0,0 +1,29 @@
+# Generated by Django 4.2.14 on 2026-01-20 14:07
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('blog', '0004_attachment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='attachment',
+            name='uploader_id',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+        migrations.AddField(
+            model_name='attachment',
+            name='uploader_name',
+            field=models.CharField(blank=True, default='', max_length=150),
+        ),
+        migrations.AlterField(
+            model_name='attachment',
+            name='post',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='attachments', to='blog.post'),
+        ),
+    ]

blog/migrations/0006_attachment_batch_id.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.14 on 2026-01-20 14:25
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('blog', '0005_attachment_uploader_id_attachment_uploader_name_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='attachment',
+            name='batch_id',
+            field=models.CharField(blank=True, default='', max_length=36),
+        ),
+    ]