CREATE TABLE IF NOT EXISTS admins (
  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  username VARCHAR(80) NOT NULL UNIQUE,
  password_hash VARCHAR(255) NOT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS settings (
  setting_key VARCHAR(100) PRIMARY KEY,
  setting_value MEDIUMTEXT NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS knowledge (
  id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  title VARCHAR(180) NOT NULL,
  category VARCHAR(100) NOT NULL DEFAULT 'Genel',
  content MEDIUMTEXT NOT NULL,
  keywords VARCHAR(500) NOT NULL DEFAULT '',
  priority TINYINT UNSIGNED NOT NULL DEFAULT 5,
  is_active TINYINT(1) NOT NULL DEFAULT 1,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  INDEX idx_active_priority (is_active, priority),
  INDEX idx_category (category)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS conversations (
  id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  session_id VARCHAR(80) NOT NULL,
  role ENUM('user','assistant') NOT NULL,
  message MEDIUMTEXT NOT NULL,
  page_url VARCHAR(1000) NOT NULL DEFAULT '',
  page_title VARCHAR(500) NOT NULL DEFAULT '',
  ip_hash CHAR(64) NOT NULL DEFAULT '',
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  INDEX idx_session_created (session_id, created_at),
  INDEX idx_created (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS rate_limits (
  bucket_key CHAR(64) PRIMARY KEY,
  hit_count INT UNSIGNED NOT NULL DEFAULT 0,
  window_start DATETIME NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;