Backend half of offline Phase 1. Lets the offline outbox replay a write after a
lost response without executing it twice (e.g. an order whose POST reached the
server but whose reply never came back).
- IdempotencyRecord entity + table (unique index on (Scope, Key)); migration
AddIdempotencyRecords. Standalone POCO — no tenant/soft-delete filters.
- IdempotencyMiddleware (after TenantMiddleware, before plan-limit/controllers):
opt-in via `Idempotency-Key` header on POST/PUT/PATCH/DELETE.
* Completed key → replays stored status+body with `Idempotent-Replay: true`.
* In-progress key → 409 IDEMPOTENCY_IN_PROGRESS; the unique index serializes
racing first requests; stale (>60s) reservations are recovered after a crash.
* Only <500 responses are cached; 5xx is released so the client can retry.
Bookkeeping runs in isolated DI scopes so it never contaminates the controller's
unit of work. Keys are scoped per café — no cross-tenant collisions.
- 5 middleware tests (replay/execute-once, distinct key, pass-through, tenant
isolation, 5xx-not-cached). Full suite 86 passing.
Next in Phase 1: generalize the POS order queue into a generic client outbox that
sends these keys and remaps client→server ids.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds POST /api/cafes/{cafeId}/demo/seed (owner-only) that seeds:
- 9% default VAT tax
- 7 menu categories + 59+ items via DemoMenuSeeder
- 15 inventory ingredients (coffee shop staples)
- 10 tables across 3 floors on the first active branch
Frontend DemoDataBanner appears on menu, tables, and inventory
pages when the café is completely empty, so owners can populate
demo data in one click instead of entering everything manually.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Full backend implementation:
- Multi-tenant cafe/restaurant management (menus, orders, tables, staff)
- POS order flow with ZarinPal and Snappfood payment integration
- OTP authentication via Kavenegar SMS
- QR digital menu with public discover/finder endpoints
- Customer loyalty, coupons, CRM
- PostgreSQL via EF Core, Redis for caching/sessions
- Background jobs, webhook handlers
- Full migration history
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
soroush.asadi