-- Create API keys table for external service authentication
CREATE TABLE IF NOT EXISTS api_keys (
  api_key_id INT AUTO_INCREMENT PRIMARY KEY,
  key_name VARCHAR(100) NOT NULL,
  key_hash VARCHAR(255) UNIQUE NOT NULL,
  key_prefix VARCHAR(20) NOT NULL,
  is_active BOOLEAN DEFAULT TRUE,
  created_by INT,
  last_used TIMESTAMP NULL,
  expires_at TIMESTAMP NULL,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (created_by) REFERENCES users(user_id) ON DELETE SET NULL,
  INDEX idx_key_hash (key_hash),
  INDEX idx_is_active (is_active)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;