INFRASTRUCTURE

What it needs

• Postgres: verified (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

Before you start

• Authorized access to the Amazon RDS for PostgreSQL source and its export tooling
• An inventory of every component in scope and out of scope
• A validated backup or copy before any cutover
• An Ample account token with servers:write, databases:read

TESTED CONFIGURATION

Exactly what was tested

• build: npm run build --if-present
• install: npm install
• runtime: node
• size: s-1vcpu-1gb
• start: npm run start
• template: node-22

STEP BY STEP

How to do it

1. 1

Inventory the source

List what Amazon RDS for PostgreSQL provides beyond the component you are moving. Out of scope here: Multi-AZ failover, read replicas, IAM authentication, PITR and Performance Insights have no equivalent on the managed database.

2. 2

Source step 1

Take a logical backup with pg_dump -Fc from a network location that can reach the instance

3. 3

Source step 2

Check the engine major version, extensions and parameter-group settings the app depends on

4. 4

Source step 3

Restore into a scratch managed database first and compare row counts

5. 5

Provision and restore

Deploy the app once so a managed PostgreSQL 16 database exists (or create one with ample database create --engine postgres), then restore the dump with pg_restore using its connection string; keep migrations idempotent.

   ample database create --name <db-name> --engine postgres

6. 6

Validate before cutover

Run the app's own checks and, for data, compare counts and checksums; the example checks are the pattern self-tests (/p/multi-tenant-relational-data).

7. 7

Cut over

Freeze writes at the source with the user's go-ahead, take the final dump, restore, validate, redeploy with the managed DATABASE_URL, keep RDS until confirmed.

8. 8

Rollback

Point DNS or configuration back to the source. The source was never modified; deletion is a separate, user-executed step after validation.

EXAMPLES

Tested examples

• Express pattern fixture (destination) (tests/deploy-canaries/express-patterns): Verified destination basis: multi-tenant relational data.

SUCCESS CHECKS

How to know it worked

• destination app responds on its public URL (/ on the live URL, expect ample canary express patterns)
• multi-tenant-relational-data check from the destination example (/p/multi-tenant-relational-data on the live URL, expect see the pattern fixture checks)
• data or object counts and checksums match the source

LIMITATIONS

Know the limits

• Documentation only: nothing is executed automatically and no execution binding is offered.
• The source-side procedure is documented from Amazon RDS for PostgreSQL's standard tooling and was not executed in this catalog's evidence; the destination side was verified with the pattern fixture.
• No full source-product parity is claimed: Multi-AZ failover, read replicas, IAM authentication, PITR and Performance Insights have no equivalent on the managed database.
• Verified on the node-22 template at s-1vcpu-1gb; region, compliance and request-duration limits are unknown.
• Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures on the managed side are not verified beyond the pattern checks.

COST

Cost estimate

Estimated 10.00 USD per month (size prices from pricing.toml at build revision a1b8c38919e59cd035ebabaced73cf84ece24371).

• app server x1 s-1vcpu-1gb: 5.00 USD
• managed PostgreSQL database x1 s-1vcpu-1gb: 5.00 USD

Destination always-on monthly price of the tested sizes; apps auto-pause when idle. Source costs are unknown to Ample.

EVIDENCE

Verification evidence

• canary_run on 2026-09-21T02:34:39Z at revision 1d28ae0-dirty (CLI 0.1.21): Destination side verified: the Express pattern fixture deployed on Ample (npm install, npm run build --if-present, npm run start on the node-22 template) and its checks passed (a tenant column on every row and query, with a cross-tenant read returning nothing (tenant_isolation=ok)). The source-side export from Amazon RDS for PostgreSQL is documented from the vendor's standard tooling and was not executed by this catalog's evidence. (expires 2027-03-20T02:34:39Z)

EXECUTION

Execution binding

No execution binding. This recipe is documentation only; nothing is executed automatically.

NEXT ACTIONS

Typed next actions

• Browse the catalog index (GET /v1/catalog on the api origin; authentication not required, approval not required)
• Search published recipes by intent, stack and constraints (POST /v1/catalog/search on the api origin; authentication not required, approval not required)
• Prepare a side-effect-free deployment plan for an authorized project (POST /v1/catalog/plan on the api origin; authentication required, approval not required)
• Read the existing agent authentication setup (GET /mcp/setup on the api origin; authentication not required, approval not required)
• Browse Amazon RDS for PostgreSQL (GET /v1/catalog/nodes/migration%3Aamazon-rds-for-postgresql on the api origin; authentication not required, approval not required)
• Browse Multi-tenant relational data (GET /v1/catalog/nodes/pattern%3Amulti-tenant-relational-data on the api origin; authentication not required, approval not required)
• Browse Migrate Postgres (GET /v1/catalog/nodes/intent%3Amigrate-postgres on the api origin; authentication not required, approval not required)

Actions describe possible next steps. They are typed data, not commands, and grant no permission. Public discovery never provisions anything; planning requires your own authenticated token and approval happens in your client.