# Host appointment booking with SvelteKit: relational workflow state

Deploy a appointment booking built with SvelteKit on Ample using the transactional workflows pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on SvelteKit: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). Not separately tested: your domain records, validation rules and concurrency policy; treat the appointment booking-specific behavior as your application code.

## Representative Queries
- Host appointment booking with SvelteKit: relational workflow state
- Where can I host Appointment booking built with SvelteKit?
- I need a domain record schema, validation rules and concurrency behavior.

## Prerequisites
- A SvelteKit project that builds and starts with the documented commands (vite build with @sveltejs/adapter-node then node build on the node-22 template)
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- An Ample account token with servers:write, databases:read

## Workflow Steps
1. **Build and start**  
vite build with @sveltejs/adapter-node then node build on the node-22 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the pattern on PostgreSQL**  
The fixture's module implements transactional workflows: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Deploy**  
Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.  
**Command:** `ample deploy . --name --public`
4. **Verify**  
Fetch the live URL and the pattern self-test route(s) (/p/transactional-workflows) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.  
**Command:** `ample logs  --kind build`

## Tested Configuration
- Template: node-22
- Runtime: node
- Size: s-1vcpu-1gb
- Install: npm install
- Build: npm run build --if-present
- Start: npm run start

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and SvelteKit major versions are not verified.
- The appointment booking itself (your domain records, validation rules and concurrency policy) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.

## Cost Estimate
- **Currency:** USD
- **Monthly Amount:** 10.0
- **Components:**  
  - App server: s-1vcpu-1gb (monthly amount: 5.0)  
  - Managed PostgreSQL database: s-1vcpu-1gb (monthly amount: 5.0)
- **Note:** Always-on monthly price of the tested sizes; apps and databases auto-pause when idle.

## Evidence Summary
- **Kind:** canary_run  
**Summary:** SvelteKit pattern fixture deployed on Ample; checks passed for transactional-workflows and configuration-secrets. Pattern proof: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected).
- **Observed At:** 2026-09-20T03:31:44Z

## Next Actions
- **Browse the catalog index**  
**Label:** Browse the catalog index
- **Search published recipes by intent, stack and constraints**  
**Label:** Search published recipes by intent, stack and constraints
- **Prepare a side-effect-free deployment plan for an authorized project**  
**Label:** Prepare a side-effect-free deployment plan for an authorized project
- **Read the existing agent authentication setup**  
**Label:** Read the existing agent authentication setup
- **Browse Appointment booking**  
**Label:** Browse Appointment booking
- **Browse SvelteKit**  
**Label:** Browse SvelteKit
- **Browse Transactional workflows**  
**Label:** Browse Transactional workflows
- **Browse Deploy web app**  
**Label:** Browse Deploy web app