fetchAll("SELECT c.id, c.message_id, c.direction, c.message_type, c.content, c.created_at, u.phone_number FROM conversations c JOIN users u ON c.user_id=u.id WHERE u.phone_number = ? ORDER BY c.created_at DESC LIMIT 5", [$phone]); header('Content-Type: application/json'); echo json_encode($rows, JSON_PRETTY_PRINT);