-- Create voice_signals table for reliable signaling
CREATE TABLE IF NOT EXISTS voice_signals (
    id INT AUTO_INCREMENT PRIMARY KEY,
    room_id VARCHAR(50) NOT NULL,
    from_peer_id VARCHAR(16) NOT NULL,
    to_peer_id VARCHAR(16) NOT NULL,
    data TEXT NOT NULL,
    created_at_ms BIGINT NOT NULL,
    INDEX (to_peer_id),
    INDEX (created_at_ms)
);