// Storage namespace calculation
bytes32 constant STORAGE_SLOT = keccak256(
    abi.encode(
        uint256(keccak256("muchfi.clob.orderbook.storage")) - 1
    )
) & ~bytes32(uint256(0xff));

struct OrderBookStorage {
    // Pool configuration
    PoolKey poolKey;
    TradingRules tradingRules;

    // Order data
    mapping(uint256 => Order) orders;
    uint256 nextOrderId;

    // Price trees
    RedBlackTree buyTree;
    RedBlackTree sellTree;

    // Order queues at each price level
    mapping(uint256 => OrderQueue) buyQueues;
    mapping(uint256 => OrderQueue) sellQueues;
}

struct BalanceManagerStorage {
    // User balances: user => currency => amount
    mapping(address => mapping(address => uint256)) balances;

    // Locked balances: user => operator => currency => amount
    mapping(address => mapping(address => mapping(address => uint256))) lockedBalances;

    // Fee configuration
    uint256 feeMaker;
    uint256 feeTaker;
    address feeReceiver;
}