Crussell

Nail salon booking platform — Go 1.25 backend + SvelteKit 5 SPA + PostgreSQL 17 + Docker. Built for a UK sole-trader nail artist. Europe/London timezone only, UK phone format only, single-employee business.

Features

Booking: Self-service (customer), walk-in (admin), call-in (admin). Slot reservations prevent double-booking (4 TTL types). Guest accounts with GDPR-compliant anonymization. Service eligibility based on age + patch test validity.

Payments: Square Terminal (in-person) + Web Payments SDK (online). Cash with change calculation. Gift cards (12-digit code or account balance). Saved cards for faster checkout. Tips on completed bookings. Refunds with notice-period tiers and deposit protection (72h/24h thresholds). All payment types: deposit, full, partial, balance, tip. Payment >20% of total promotes pending_release bookings back to confirmed. Deposit paid is computed from payments on-the-fly. The first 50% of each payment is always carved out as deposit (via buildSplitRecords); any overflow beyond the booking total becomes a tip. A PostgreSQL pg_advisory_lock serializes payment attempts per-booking to prevent two-tab double-payment races.

Gift Cards: Multi-method purchase (cash, card machine, online card, giveaway). Inventory cards for stock management. 24-month rolling expiry. Idle account cleanup (2yr/5yr thresholds). Expired balance recovery with admin audit trail. Transaction audit log. Idempotency keys for purchases.

Scheduling: Default weekly hours, holiday/exceptional groups, time blockers (one-off + recurring with cron). Lunch protection. Late-night lock (22:00–11:00). Admin schedule page (Google Calendar-style week view).

Custom Services: One-off or special-request services not in the permanent catalog. Admin management with create, edit, promote to permanent service (migrates booking references), and delete. Full CRUD API with search, popular sorting, and pagination. Can be added to any booking alongside regular services.

Admin: Today page with interactive calendar grid. Booking management (create, edit, reschedule, approve, cancel). User management with customer relationship data (spend, visits, top services). Custom services (one-off services with create/edit/promote/delete). Discount campaigns (time-based and milestone). Time blocker CRUD. Portfolio image upload with tag management. Gift card management. Business settings (VAT, gift card config). Notification queue with priority ordering.

Loyalty & Discounts: 1 stamp per paid appointment (max 1/day). 10 stamps → 10% off via opt-in checkbox at payment or till. Stamps refunded on cancellation. Campaigns auto-apply at both payment and completion: time-based, per-user milestone, global milestone (in-person only), anniversary. All discounts stack additively against original total. Discount payment records excluded from refund calculations.

Compliance: GDPR Article 15 data export (async, 12h cache, 21-section JSON + PDF — excludes verification codes as authentication tokens). Account deletion with external system scrubbing (S3, Square). Guest PII anonymized 6 months post-appointment. UK financial data retention (7 years). Gift card SPV/MPV VAT treatment configurable.

Frontend: Portfolio gallery with fuzzy tag search (relevance-sorted) and exact category filters (date-sorted), multi-format images (AVIF/WebP/JPEG/JXL with WASM client-side encoding), cursor-based pagination. MapLibre GL map on contact page. PhoneInput component with UK validation. CharCounter for long notes.

Infrastructure: Docker Compose (postgres, backend, sabredav, nginx). Dev mock for Square payments (//go:build dev). RustFS dev storage, Cloudflare R2 for prod. SabreDAV CardDAV sync for profile photos.

Limitations

• Single employee — no multi-staff scheduling, no team management
• No email/SMS — SMTP integration not wired; booking reminders, password resets, and notifications are UI-only
• No production S3/R2 — prod storage stubs return "not implemented"
• No social auth — OAuth providers (Google, Microsoft, Facebook) not registered
• No dark mode, no PWA, no recurring bookings, no CSV export
• Password reset flow exists backend-only — no frontend link
• No error tracking/monitoring — Sentry not configured

Prerequisites

Tool	Version
Docker & Docker Compose	>= 20.10
Go	>= 1.22
Node	>= 18 (npm)
tmux	>= 3.0

Getting Started

cp .env.example .env
# Edit .env — set POSTGRES_*, JWT_SECRET_KEY
docker compose up --build -d

Service	URL
Frontend	http://localhost
API	http://localhost/api
SabreDAV	http://localhost/dav

Local dev (tmux)

./local-dev-2.sh

Launches 4-pane tmux session: psql console, Go dev server, Svelte dev server, Rustfs logs. Seeds 20 users, 12 services, 43 bookings, guest accounts, time blockers, exceptional hours.

Default logins (password: password):

• Admin: admin@example.com
• User: user@example.com

Building & Testing

cd backend && go build -o bin/backend ./main.go
cd frontend && npm ci && npm run build
cd backend && go test -tags "test,dev" -count=1 -parallel 8 ./...   # ~960 tests, 0 failures, 4 skipped (~9s)
cd backend && go test -tags "test,dev" -count=10 -parallel 8 ./...  # thorough verification (~39s)

Full Documentation

Detailed architecture, schema, admin workflows, user journeys, and backlog in obsidian/Crussell/.