Can I vibe code Prediko?

Build a full-stack inventory planning and demand forecasting application for Shopify stores using Next.js, Supabase, and Python (FastAPI).

1. SYSTEM ARCHITECTURE
- Frontend: Next.js App Router with Tailwind CSS and Recharts for time-series forecasting visualisations.
- Backend API: Node.js for Shopify integration & Supabase PostgreSQL for persistence.
- Forecasting Microservice: Python FastAPI service running Facebook Prophet and statsmodels for statistical calculations.

2. DATA MODEL & SCHEMA
Create a PostgreSQL schema including:
- `products`: id, shopify_product_id, sku, title, minimum_order_qty, supplier_lead_time_days, safety_stock_days.
- `inventory_levels`: id, product_id, location_id, current_stock, committed_stock, available_stock.
- `sales_history`: id, product_id, date, quantity_sold, was_out_of_stock (boolean).
- `suppliers`: id, name, email, default_lead_time_days.
- `purchase_orders`: id, supplier_id, status (draft, sent, partially_received, received), created_at.
- `purchase_order_items`: id, purchase_order_id, product_id, quantity_ordered, unit_cost.
- `bill_of_materials`: id, parent_product_id, raw_material_product_id, ratio_required.

3. CORE LOGIC & FORECASTING ENGINE
- Ingest daily sales via Shopify Orders REST/GraphQL API. Store aggregated daily totals in `sales_history`.
- Stockout Imputation: If `was_out_of_stock` is true, impute baseline demand using average velocity of the prior 14 in-stock days.
- Forecasting API: Endpoint `/api/forecast` accepts `product_id` and `horizon_days`. Runs Prophet model incorporating day-of-week and monthly seasonality. Outputs predicted daily velocity.
- Reorder Point Calculation: `Reorder Point = (Daily Forecast Velocity * Lead Time Days) + Safety Stock` where `Safety Stock = Daily Forecast Velocity * Safety Stock Days`.
- Days of Inventory Left: `Available Stock / Daily Forecast Velocity`.
- BOM Explosion: When calculating raw material demand, multiply forecasted finished product demand by `ratio_required` in `bill_of_materials`.

4. PURCHASE ORDER WORKFLOW
- Dashboard displaying SKUs where `Days of Inventory Left <= Lead Time Days + Safety Stock Days`.
- One-click Purchase Order generation grouped by supplier.
- Ability to export POs to PDF or automatically email them to supplier email addresses.
- PO Receipt tracking: updating `inventory_levels` and marking PO as received upon arrival.

5. OUT OF SCOPE & FAILURE MODES
- Out of scope: Multi-currency conversion, complex warehouse barcode scanning, accounting ledger integrations.
- Edge cases to handle: Missing daily sales data (fill zero-sales days), negative stock values from Shopify sync, zero lead time division errors.

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