CREATE TABLE messages (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL,
    message TEXT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    signature TEXT,
    is_encrypted BOOLEAN DEFAULT FALSE,
    INDEX idx_created_at (created_at)
);

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    pgp_key TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    is_moderator TINYINT(1) NOT NULL DEFAULT 0,
    login_attempts INT NOT NULL DEFAULT 0,
    last_attempt TIMESTAMP NULL,
    is_blocked TINYINT(1) NOT NULL DEFAULT 0,
    block_reason TEXT,
    INDEX idx_username (username)
);

CREATE TABLE registrations (
    id INT AUTO_INCREMENT PRIMARY KEY,
    ip VARCHAR(45) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_ip_created (ip, created_at),
    INDEX idx_created_at (created_at)
);