Add Database Storage to a Commerce App

Integrates App Builder Database Storage into an existing Commerce app and scaffolds a runtime action that uses @adobe/aio-lib-db to read and write documents. The library is MongoDB-like: data lives in collections of documents, queried with familiar filters.

The db-access code is identical regardless of action type — what differs is how the action is registered and what its handler returns:

• Web action — HTTP-invokable (web: "yes"); returns a response built with the responses helpers from @adobe/aio-commerce-lib-core.
• Event/webhook action — invoked by a Commerce event or webhook; referenced from app.commerce.config.ts via commerce-app-eventing (runtimeActions) or commerce-app-webhooks (runtimeAction).

Prerequisites

• Verify the app is scaffolded and initialized, not merely that the config exists. Require both:
  • app.commerce.config.ts present in the project root, and
  • the project initialized — signalled by the generated src/commerce-extensibility-1/ directory and installed node_modules (the @adobe/aio-commerce-lib-app dependency).
• If app.commerce.config.ts is missing, stop and invoke commerce-app-init first (it writes the config, then runs init).
• If the config is present but the project is not initialized (no src/commerce-extensibility-1/ or node_modules), run npx @adobe/aio-commerce-lib-app init before continuing. Init is idempotent — it finds the existing config, skips the interactive prompts, installs dependencies, and generates the project files.
• Actions and custom installation scripts can be authored in TypeScript only once the project has the TypeScript build setup (webpack-config.cjs + root tsconfig.json) that init scaffolds for a TypeScript Commerce config — see commerce-app-init. Otherwise, author them in JavaScript.
• The App Builder Data Services API (API code AppBuilderDataServicesSDK) must be added to the project in the Adobe Developer Console — in every workspace that uses the database (no special license beyond App Builder). Without it, runtime actions cannot authenticate to the database service.