Add a migration file

backend/roles/migrations/0001_initial.py

@@ -0,0 +1,54 @@
+# Generated by Django 3.2.8 on 2022-01-11 06:55
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('api', '0028_auto_20220111_0655'),
+    ]
+
+    operations = [
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.CreateModel(
+                    name='Role',
+                    fields=[
+                        ('id',
+                         models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                        ('name', models.CharField(max_length=100, unique=True)),
+                        ('description', models.TextField(default='')),
+                        ('created_at', models.DateTimeField(auto_now_add=True)),
+                        ('updated_at', models.DateTimeField(auto_now=True)),
+                    ],
+                ),
+                migrations.CreateModel(
+                    name='RoleMapping',
+                    fields=[
+                        ('id',
+                         models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                        ('created_at', models.DateTimeField(auto_now_add=True)),
+                        ('updated_at', models.DateTimeField(auto_now=True)),
+                        ('project',
+                         models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='role_mappings',
+                                           to='api.project')),
+                        ('role', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='roles.role')),
+                        ('user',
+                         models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='role_mappings',
+                                           to=settings.AUTH_USER_MODEL)),
+                    ],
+                    options={
+                        'unique_together': {('user', 'project')},
+                    },
+                ),
+            ],
+            database_operations=[]
+        )
+
+    ]