Closes the last multi-currency gap before v0.2.0:0 cutover. Operators
who created a product in one currency can now switch to another via
the Edit modal — no need to disable + recreate.
Backend:
- PATCH /v1/admin/products/:id accepts price_currency + price_value
alongside the legacy price_sats. Same validation shape as the
create endpoint (whitelist SAT|USD|EUR, mismatched legacy + typed
→ 400).
- repo::update_product_with_currency replaces the SAT-only
update_product as the canonical entry; the SAT-only function is
now a thin wrapper that always passes "SAT". For SAT updates,
price_sats and price_value are dual-written. For fiat updates,
price_sats is reset to 0 — gets repopulated by the rate fetcher
on the next invoice creation against the product.
Frontend (Products → Edit modal):
- Currency picker dropdown next to the price input. Initial value
reads from the product's current currency.
- For fiat products, the displayed price renders as decimal main
units ($49.00); save converts to cents on the way out.
- Hint text + step swap as the operator changes currency.
- Doesn't auto-clobber the displayed value when currency changes
— operator decides if the same number still makes sense.
No schema changes (column shape from migration 0010 is sufficient).
Test count unchanged at 38 — pure handler + UI work, behavior
covered by the existing currency tests on create.
Grant
45e0cd2bd1