initial commit

apps/backend/migrations/0001_init.sql

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+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE users (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  email TEXT NOT NULL UNIQUE,
+  display_name TEXT NOT NULL,
+  password_hash TEXT NOT NULL,
+  role TEXT NOT NULL DEFAULT 'user' CHECK (role IN ('user','admin')),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE products (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  name TEXT NOT NULL,
+  price_cents INT NOT NULL CHECK (price_cents >= 0),
+  active BOOLEAN NOT NULL DEFAULT TRUE,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE ledger (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id UUID NOT NULL REFERENCES users(id),
+  amount_cents INT NOT NULL,
+  kind TEXT NOT NULL CHECK (kind IN ('topup','purchase','adjustment')),
+  ref_id UUID,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE orders (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id UUID NOT NULL REFERENCES users(id),
+  total_cents INT NOT NULL CHECK (total_cents >= 0),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE order_items (
+  order_id UUID NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
+  product_id UUID NOT NULL REFERENCES products(id),
+  qty INT NOT NULL CHECK (qty > 0),
+  price_cents INT NOT NULL CHECK (price_cents >= 0),
+  PRIMARY KEY (order_id, product_id)
+);
+
+CREATE TABLE inventory_movements (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  product_id UUID NOT NULL REFERENCES products(id),
+  qty INT NOT NULL,
+  reason TEXT NOT NULL CHECK (reason IN ('purchase','consumption','correction')),
+  note TEXT,
+  created_by UUID REFERENCES users(id),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE VIEW user_balances AS
+SELECT user_id, COALESCE(SUM(amount_cents),0) AS balance_cents
+FROM ledger GROUP BY user_id;
+
+CREATE VIEW product_stock AS
+SELECT p.id AS product_id, COALESCE(SUM(m.qty),0) AS stock
+FROM products p
+LEFT JOIN inventory_movements m ON m.product_id = p.id
+GROUP BY p.id;