Exclude 'creator' nested object from model_dump when creating custom commands.
The issue was that Pydantic was including both creator_id and creator fields,
causing Peewee to receive a nested dict that resulted in NULL creator_id values
in the database insert, violating the NOT NULL constraint.
This fix ensures only creator_id is passed to the ORM for foreign key mapping.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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