Can I vibe code Klaviyo?

Build a full-stack E-Commerce Automated Flow Engine using Next.js (App Router), PostgreSQL, Prisma, and Tailwind CSS. The app ingests store webhooks, builds customer profiles, executes multi-step marketing flows, and dispatches emails via Mailgun or Resend.

CORE DATA MODELS:
1. Profile: id, email (unique), phone, firstName, lastName, totalSpent, orderCount, lastPurchasedAt, properties (JSONB), status (subscribed, unsubscribed, suppressed).
2. Event: id, profileId, eventName (e.g., 'Placed Order', 'Started Checkout', 'Viewed Product'), payload (JSONB), timestamp.
3. Flow: id, name, triggerEvent, status (draft, active), definition (JSONB array of steps: delay, condition, action).
4. FlowExecution: id, flowId, profileId, currentStepIndex, nextRunAt, status (pending, completed, cancelled), stateData (JSONB).
5. MessageLog: id, profileId, channel (email/sms), status (queued, sent, failed), metadata (JSONB).

REALTIME EVENT INGESTION & WEBHOOKS:
- Create an API route POST /api/webhooks/shopify that receives order, cart, and customer payloads.
- Parse incoming webhooks, upsert the Profile model based on email, and insert an Event record.
- Trigger an async flow-evaluation worker every time a new Event is recorded.

FLOW EXECUTION ENGINE:
- Support step types:
  a. DELAY: Pause execution for a set duration (e.g., 2 hours, 1 day).
  b. CONDITION: Evaluate JS expressions against Profile attributes or Event payload (e.g., `profile.totalSpent > 100` or `event.payload.value > 50`).
  c. ACTION_EMAIL: Send an HTML email using a pre-defined template with mustache variable interpolation (e.g., {{profile.firstName}}, {{event.payload.cartUrl}}).
- Build a background worker (Cron API route or background polling) that runs every 60 seconds to process `FlowExecution` records where `nextRunAt <= NOW()` and `status == 'pending'`.
- Implement event cancellation logic: If a user receives a 'Placed Order' event, automatically cancel any pending 'Started Checkout' flow executions for that profile.

FRONTEND UI:
- Dashboard displaying metrics: Total Revenue, Flow Revenue, Active Subscribers, Emails Sent.
- Profile Detail View: Showing full profile timeline with all ingested events in chronological order.
- Flow Visualizer/Editor: JSON-backed step configurator where users can define trigger events, delays, branch conditions, and email template selection.
- Email Template Builder: Simple Markdown/HTML editor with preview and token insertion pills.

FAILURE MODES & EDGE CASES:
- Ensure strict compliance: Do NOT execute ACTION_EMAIL if `profile.status !== 'subscribed'`.
- Duplicate Webhook Protection: Deduplicate incoming webhooks using Shopify's `X-Shopify-Webhook-Id` header stored in a Redis or DB cache.
- Rate Limit Handling: Wrap third-party email dispatch calls in exponential backoff retry blocks.

OUT OF SCOPE:
- Visual drag-and-drop canvas library (use structured step forms/lists instead).
- Native carrier SMS handling (mock SMS log entries).
- Multi-tenant billing and subscription logic.

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