SymbolStorage.sol

// SPDX-License-Identifier: SYMM-Core-Business-Source-License-1.1
// This contract is licensed under the SYMM Core Business Source License 1.1
// Copyright (c) 2023 Symmetry Labs AG
// For more information, see https://docs.symm.io/legal-disclaimer/license
pragma solidity >=0.8.18;

struct Symbol {
    uint256 symbolId;
    string name;
    bool isValid;
    uint256 minAcceptableQuoteValue;
    uint256 minAcceptablePortionLF;
    uint256 tradingFee;
}

library SymbolStorage {
    bytes32 internal constant SYMBOL_STORAGE_SLOT = keccak256("diamond.standard.storage.symbol");

    struct Layout {
        mapping(uint256 => Symbol) symbols;
        uint256 lastId;
    }

    function layout() internal pure returns (Layout storage l) {
        bytes32 slot = SYMBOL_STORAGE_SLOT;
        assembly {
            l.slot := slot
        }
    }
}