feat!: ComponentVersionMedia.key -> ComponentVersionMedia.path

BREAKING CHANGE: Renamed ComponentVersionMedia.key -> ComponentVersionMedia.path
BREAKING CHANGE: In create_component_version_media(...) and
                 look_up_component_version_media(...), renamed param key -> path.

Part of: #322

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kdmccormick

src/openedx_content/migrations/0018_rename_componentversionmedia_key_to_path.py

@@ -0,0 +1,29 @@
+from django.db import migrations, models
+
+import openedx_django_lib.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('openedx_content', '0017_rename_learningpackage_db_column_key_to_package_ref'),
+    ]
+
+    operations = [
+        migrations.RemoveConstraint(
+            model_name='componentversionmedia',
+            name='oel_cvcontent_uniq_cv_key',
+        ),
+        migrations.RenameField(
+            model_name='componentversionmedia',
+            old_name='key',
+            new_name='path',
+        ),
+        migrations.AddConstraint(
+            model_name='componentversionmedia',
+            constraint=models.UniqueConstraint(
+                fields=['component_version', 'path'],
+                name='oel_cvcontent_uniq_cv_key',
+            ),
+        ),
+    ]

src/openedx_content/migrations/0019_rename_componentversionmedia_db_column_key_to_path.py

@@ -0,0 +1,37 @@
+from django.db import migrations
+
+import openedx_django_lib.fields
+
+
+class Migration(migrations.Migration):
+    """
+    Rename the underlying DB column for ComponentVersionMedia.path from
+    '_key' to 'path'. Uses SeparateDatabaseAndState with RunSQL for
+    SQLite/MySQL compatibility. The table is named
+    'openedx_content_componentversionmedia' (Django default).
+    """
+
+    dependencies = [
+        ('openedx_content', '0018_rename_componentversionmedia_key_to_path'),
+    ]
+
+    operations = [
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.AlterField(
+                    model_name='componentversionmedia',
+                    name='path',
+                    field=openedx_django_lib.fields.MultiCollationCharField(
+                        db_collations={'mysql': 'utf8mb4_bin', 'sqlite': 'BINARY'},
+                        max_length=500,
+                    ),
+                ),
+            ],
+            database_operations=[
+                migrations.RunSQL(
+                    sql='ALTER TABLE openedx_content_componentversionmedia RENAME COLUMN _key TO path',
+                    reverse_sql='ALTER TABLE openedx_content_componentversionmedia RENAME COLUMN path TO _key',
+                ),
+            ],
+        ),
+    ]