Lifts the "scope cannot be edited" rule for policies. Product scope
remains read-only (moving a code between products has weird semantics
for historical redemptions), but the tiers a code applies to can now
be refined in-place via the Edit form's pill multi-picker.
- repo::update_discount_code: new applies_to_policy_id param
(Option<Option<String>>) alongside the existing applies_to_policy_ids
multi field. Both update the right columns; caller passes a
consistent pair so singular + JSON columns don't drift.
- Admin PATCH endpoint: new optional `policy_slugs` field. Server
resolves slugs against the code's existing product, then normalizes:
- [] → both columns NULL (any policy on the product)
- [one] → singular column set, JSON column cleared
- [two+] → JSON column set, singular column cleared
Sending no `policy_slugs` leaves scope alone (back-compat).
- Edit form: pill multi-picker replaces the read-only Applies-to label.
Pre-selected from the code's current allowed-policy set. Product
label stays read-only above the picker.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Grant
3c054c65db