fix(squash): squash migrations 0007-0010 into single migration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kdmccormick

src/openedx_content/migrations/0007_rename_collection_key_to_code_in_python.py

@@ -0,0 +1,75 @@
+"""
+Rename Collection.key -> Collection.collection_code and change from key_field to code_field.
+
+Squashed from 0007–0010.
+"""
+import re
+
+import django.core.validators
+import django.db.models.lookups
+from django.conf import settings
+from django.db import migrations, models
+
+import openedx_django_lib.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('openedx_content', '0006_typed_ids'),
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        # Drop old constraint (references the old field name).
+        migrations.RemoveConstraint(
+            model_name='collection',
+            name='oel_coll_uniq_lp_key',
+        ),
+        # Rename the column.
+        migrations.RenameField(
+            model_name='collection',
+            old_name='key',
+            new_name='collection_code',
+        ),
+        # Change from key_field (max_length=500, no validator) to code_field
+        # (max_length=255, with regex validator).
+        migrations.AlterField(
+            model_name='collection',
+            name='collection_code',
+            field=openedx_django_lib.fields.MultiCollationCharField(
+                db_collations={'mysql': 'utf8mb4_bin', 'sqlite': 'BINARY'},
+                max_length=255,
+                validators=[
+                    django.core.validators.RegexValidator(
+                        re.compile('^[a-zA-Z0-9\\-\\_\\.]+\\Z'),
+                        'Enter a valid "code name" consisting of letters, numbers, underscores, hyphens, or periods.',
+                        'invalid',
+                    ),
+                ],
+            ),
+        ),
+        # Re-add uniqueness constraint with the new field name.
+        migrations.AddConstraint(
+            model_name='collection',
+            constraint=models.UniqueConstraint(
+                fields=('learning_package', 'collection_code'),
+                name='oel_coll_uniq_lp_key',
+            ),
+        ),
+        # DB-level regex check constraint.
+        migrations.AddConstraint(
+            model_name='collection',
+            constraint=models.CheckConstraint(
+                condition=django.db.models.lookups.Regex(
+                    models.F('collection_code'),
+                    '^[a-zA-Z0-9\\-\\_\\.]+\\Z',
+                ),
+                name='oel_coll_collection_code_regex',
+                violation_error_message=(
+                    'Enter a valid "code name" consisting of letters, numbers,'
+                    ' underscores, hyphens, or periods.'
+                ),
+            ),
+        ),
+    ]