chore: initial commit Dutra Store POS app

supabase/migrations/20240102_add_harga_pokok_and_profit.sql

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+-- Migration: Add harga_pokok to products and total_cost to sales
+-- Run this in Supabase Dashboard > SQL Editor
+
+-- Add harga_pokok column to products table
+ALTER TABLE products
+  ADD COLUMN IF NOT EXISTS harga_pokok numeric DEFAULT 0;
+
+-- Add total_cost column to sales table
+ALTER TABLE sales
+  ADD COLUMN IF NOT EXISTS total_cost numeric DEFAULT 0;
+
+-- Update existing products to have default harga_pokok if null
+UPDATE products
+  SET harga_pokok = 0
+  WHERE harga_pokok IS NULL;
+
+-- Update existing sales to have default total_cost if null
+UPDATE sales
+  SET total_cost = 0
+  WHERE total_cost IS NULL;