# Host ai chat application with Hono: Postgres-backed state

## Summary
Deploy an AI chat application built with Hono on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, and a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on Hono: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Not separately tested: your job types, payload schema and retry policy; treat the AI chat application-specific behavior as your application code.

## Representative Queries
- Host AI chat application with Hono: Postgres-backed state
- Where can I host AI chat application built with Hono?
- I need a durable state schema and retry/recovery semantics implemented by application code.

## Resource Requirements
- primitive:compute
- primitive:postgres

## Infrastructure Requirements
- **Compute**: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.
- **Postgres**: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.

## Prerequisites
- A Hono project that builds and starts with the documented commands (npm install and npm run start with @hono/node-server 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**: `npm install` and `npm run start` with @hono/node-server 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 durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). 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 <name> --public`
4. **Verify**: Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure, read `ample logs <app name> --kind build` then `--kind runtime`.
   - Command: `ample logs <app name> --kind build`

## Success Checks
- app responds on its public URL
  - **Kind**: http_get
  - **Path**: /
  - **Expect**: ample canary hono patterns
- durable-job-state self-test
  - **Kind**: http_get
  - **Path**: /p/durable-job-state
  - **Expect**: job=done attempts=1 idempotent=true

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and Hono major versions are not verified.
- The AI chat application itself (your job types, payload schema and retry 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.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together.

## Cost Estimate
- **Currency**: USD  
- **Monthly Amount**: $10.00  
- **Basis**: Size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty  
- **Components**:
  - app server: size: s-1vcpu-1gb, quantity: 1.0, monthly amount: $5.00  
  - managed PostgreSQL database: size: s-1vcpu-1gb, quantity: 1.0, monthly amount: $5.00  
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

## Next Actions
1. **[Browse the catalog index](https://api.ample.computer/v1/catalog)**
2. **[Search published recipes by intent, stack, and constraints](https://api.ample.computer/v1/catalog/search)**: Query: Host ai chat application with Hono: Postgres-backed state
3. **[Prepare a side-effect-free deployment plan for an authorized project](https://api.ample.computer/v1/catalog/plan)**
4. **[Read the existing agent authentication setup](https://api.ample.computer/mcp/setup)**
5. **[Browse AI chat application](https://api.ample.computer/v1/catalog/nodes/workload%3Aai-chat-application)**
6. **[Browse Hono](https://api.ample.computer/v1/catalog/nodes/stack%3Aframework-hono)**
7. **[Browse Durable job state](https://api.ample.computer/v1/catalog/nodes/pattern%3Adurable-job-state)**
8. **[Browse Deploy AI app](https://api.ample.computer/v1/catalog/nodes/intent%3Adeploy-ai-app)**