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
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• 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