Update form_submissions and other FK references

[atomicpond]

Task: Update form_submissions and other FK references

Category: Database
Suggested Agent: database-implementer
Part of: #11 (Epic 1: Actions Schema Foundation)

Requirements

Identify and update all other tables that reference platform_form_templates.id to use the new UUID primary key.

Implementation Notes

• Search codebase for references to form_template_id or platform_form_templates
• Check: form_submissions, any views, any other FKs
• May need to add form_key lookups where varchar was used directly

Acceptance Criteria

• All FK references to platform_form_templates updated to UUID
• No broken references after migration
• Views updated if applicable