first commit

init.sql

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+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+
+CREATE TABLE IF NOT EXISTS customers (
+    customer_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    first_name TEXT NOT NULL,
+    last_name TEXT NOT NULL,
+    email TEXT UNIQUE,
+    phone TEXT,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS vehicles (
+    vehicle_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    customer_id UUID NOT NULL REFERENCES customers(customer_id) ON DELETE CASCADE,
+    registration_number TEXT NOT NULL UNIQUE,
+    make TEXT NOT NULL,
+    model TEXT NOT NULL,
+    model_year INTEGER CHECK (model_year BETWEEN 1886 AND EXTRACT(YEAR FROM CURRENT_DATE)::INTEGER + 1),
+    vin CHAR(17) UNIQUE,
+    mileage INTEGER NOT NULL DEFAULT 0 CHECK (mileage >= 0),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS employees (
+    employee_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    first_name TEXT NOT NULL,
+    last_name TEXT NOT NULL,
+    role TEXT NOT NULL CHECK (role IN ('technician', 'service_advisor', 'manager')),
+    email TEXT UNIQUE,
+    active BOOLEAN NOT NULL DEFAULT TRUE
+);
+
+CREATE TABLE IF NOT EXISTS appointments (
+    appointment_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    vehicle_id UUID NOT NULL REFERENCES vehicles(vehicle_id) ON DELETE CASCADE,
+    employee_id UUID REFERENCES employees(employee_id) ON DELETE SET NULL,
+    scheduled_at TIMESTAMPTZ NOT NULL,
+    reason TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'scheduled'
+        CHECK (status IN ('scheduled', 'confirmed', 'completed', 'cancelled', 'no_show')),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS service_orders (
+    service_order_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    vehicle_id UUID NOT NULL REFERENCES vehicles(vehicle_id) ON DELETE RESTRICT,
+    assigned_employee_id UUID REFERENCES employees(employee_id) ON DELETE SET NULL,
+    opened_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    closed_at TIMESTAMPTZ,
+    complaint TEXT NOT NULL,
+    service_date DATE NOT NULL DEFAULT CURRENT_DATE,
+    diagnosis TEXT,
+    status TEXT NOT NULL DEFAULT 'open'
+        CHECK (status IN ('open', 'in_progress', 'waiting_for_parts', 'ready', 'closed', 'cancelled')),
+    CHECK (closed_at IS NULL OR closed_at >= opened_at)
+);
+
+CREATE TABLE IF NOT EXISTS service_order_items (
+    item_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    service_order_id UUID NOT NULL REFERENCES service_orders(service_order_id) ON DELETE CASCADE,
+    item_type TEXT NOT NULL CHECK (item_type IN ('labor', 'part')),
+    description TEXT NOT NULL,
+    quantity NUMERIC(10, 2) NOT NULL DEFAULT 1 CHECK (quantity > 0),
+    unit_price NUMERIC(12, 2) NOT NULL CHECK (unit_price >= 0),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS invoices (
+    invoice_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    service_order_id UUID NOT NULL UNIQUE REFERENCES service_orders(service_order_id) ON DELETE RESTRICT,
+    issued_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    due_at DATE,
+    status TEXT NOT NULL DEFAULT 'unpaid'
+        CHECK (status IN ('draft', 'unpaid', 'paid', 'void')),
+    tax_rate NUMERIC(5, 2) NOT NULL DEFAULT 0 CHECK (tax_rate >= 0 AND tax_rate <= 100)
+);
+
+CREATE TABLE IF NOT EXISTS app_users (
+    user_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    username TEXT NOT NULL UNIQUE,
+    display_name TEXT NOT NULL,
+    email TEXT UNIQUE,
+    role TEXT NOT NULL DEFAULT 'viewer'
+        CHECK (role IN ('admin', 'service_advisor', 'technician', 'viewer')),
+    can_read BOOLEAN NOT NULL DEFAULT TRUE,
+    can_add BOOLEAN NOT NULL DEFAULT FALSE,
+    can_delete BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_vehicles_customer_id ON vehicles(customer_id);
+CREATE INDEX IF NOT EXISTS idx_appointments_scheduled_at ON appointments(scheduled_at);
+CREATE INDEX IF NOT EXISTS idx_service_orders_vehicle_id ON service_orders(vehicle_id);
+CREATE INDEX IF NOT EXISTS idx_service_orders_status ON service_orders(status);
+
+INSERT INTO customers (first_name, last_name, email, phone)
+VALUES ('Alex', 'Morgan', 'alex.morgan@example.com', '+1-555-0100')
+ON CONFLICT (email) DO NOTHING;
+
+INSERT INTO app_users (username, display_name, role, can_read, can_add, can_delete)
+VALUES ('admin', 'Workshop administrator', 'admin', TRUE, TRUE, TRUE)
+ON CONFLICT (username) DO NOTHING;