feat: add included_presets column to File mirrors

Add a nullable included_presets IntegerField to the abstract
kolibri_content.base_models.File, inherited by both the kolibri_content
(sqlite export) and kolibri_public (import-metadata API) File mirrors.
It holds a bitmask of the renderable presets a device needs to render a
file. The column is additive and nullable, so old Kolibri ignores it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rtibblesbot

contentcuration/kolibri_content/base_models.py

@@ -132,6 +132,9 @@ class File(models.Model):
     supplementary = models.BooleanField(default=False)
     thumbnail = models.BooleanField(default=False)
     priority = models.IntegerField(blank=True, null=True, db_index=True)
+    # Bitmask of the renderable presets a device needs to render this file,
+    # including the file's own preset. NULL for supplementary files.
+    included_presets = models.IntegerField(blank=True, null=True)
 
     class Meta:
         abstract = True

contentcuration/kolibri_content/migrations/0024_file_included_presets.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.25 on 2026-07-12 22:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0023_auto_20250417_1516'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='file',
+            name='included_presets',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+    ]

contentcuration/kolibri_public/migrations/0009_file_included_presets.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.25 on 2026-07-12 22:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('kolibri_public', '0008_channelmetadata_categories_bitmask_0'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='file',
+            name='included_presets',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+    ]