機能開発の順序プランナー

Feature build sequence

Already available: App foundation.

1. Data layer (prerequisite)

Define the required records and relationships for the agreed core flow. Validate inputs and implement server-side access boundaries. Ask about missing data decisions before writing migrations.

Verify: Create and reload a record. Invalid input is rejected and unauthorized reads fail.

2. Dashboard

Build a dashboard using the existing components and real data sources. Include loading, empty, failure, and populated states. Do not add unrequested charts or metrics.

Verify: Check zero records, real records, a failed request, keyboard navigation, and a mobile viewport.

3. Accounts & authentication (prerequisite)

Implement the agreed account flow with the existing authentication provider. Include signed-out, expired-session, recovery, and unauthorized states.

Verify: Sign in, reload, sign out, and verify protected routes and data remain protected.

4. Payments (prerequisite)

Integrate the selected payment provider in its test environment. Store authoritative server-side payment state and handle duplicate events idempotently. Include canceled, declined, pending, and completed checkout.

Verify: Run test checkout and replay a test event. Confirm one purchase cannot create duplicate access or charges.

5. Subscriptions

Implement the agreed subscription lifecycle on top of existing billing: activation, renewal, cancellation, expiration, and plan changes. Define when entitlement changes take effect.

Verify: Use provider test scenarios for activation, cancellation, failed renewal, and duplicate events.