dashboard: let merchants cap the quantity on a unit-based price
Merged
MA
2mo ago+247+247+012345678901234567890123456789-7-7-0123456789
Summary
Was missing from the initial implementation but the API and doc mention it.
https://github.com/user-attachments/assets/ed64646e-a7ad-4031-8d07-d0cb5c54e75d
Checklist
- This PR addresses a single concern (one bug fix, one feature, one refactor)
- The diff is reasonably sized and easy to review
- New functionality is covered by tests
- Linting and type checking pass (
uv run task lint && uv run task lint_types) - No unrelated changes or drive-by fixes are included