Implement modality field extraction and annotation

[rtibbles]

Overview

Add the modality CharField to ContentNode and implement the annotation logic to populate it from the options['modality'] JSON field.

Tasks

1. Add field to models.py

   • Add modality = models.CharField(max_length=50, blank=True, null=True, db_index=True, choices=modalities.choices) to ContentNode in kolibri/core/content/models.py
   • Import modalities from le_utils.constants
   • Use le_utils.constants.modalities.choices for the field choices

2. Create migration

   • Generate Django migration for the new field

3. Create annotation function

   • Add annotate_modality(queryset) function to kolibri/core/content/utils/search.py
   • Extract modality from options JSON and populate the field

4. Call during channel import

   • Update kolibri/core/content/utils/channel_import.py to call annotate_modality() after annotate_label_bitmasks()

5. Add upgrade task

   • Add version upgrade function to kolibri/core/content/upgrade.py to backfill existing channels

6. Generate schema

   • Run kolibri manage generate_schema current to update SQLAlchemy schema

🤖 This issue was written by Claude Code, under supervision, review and final edits by @rtibbles 🤖

[LSUDOKO]

Hi! Could you please assign this issue to me? I would be very happy to contribute to your organization

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