-- Create users table
CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL
);

-- Create payments table
CREATE TABLE payments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    amount DECIMAL(10,2) NOT NULL,
    payment_date DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id)
);

-- Create tasks table
CREATE TABLE tasks (
    id INT AUTO_INCREMENT PRIMARY KEY,
    technician_id INT NOT NULL,
    description VARCHAR(255) NOT NULL,
    assigned_by INT NOT NULL,
    assigned_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    status VARCHAR(20) DEFAULT 'pending',
    FOREIGN KEY (technician_id) REFERENCES users(id),
    FOREIGN KEY (assigned_by) REFERENCES users(id)
);

-- Create messages table
CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    sender_id INT NOT NULL,
    receiver_id INT NOT NULL,
    content TEXT NOT NULL,
    sent_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    delivered BOOLEAN DEFAULT FALSE,
    FOREIGN KEY (sender_id) REFERENCES users(id),
    FOREIGN KEY (receiver_id) REFERENCES users(id)
);