  mapping(bytes32 => address) protocolManagers;
  mapping(bytes32 => address) protocolAgents;
  mapping(bytes32 => bool) protocolIsCovered;
struct ProtocolInfo {
  address manager;
  address agent;
  bool covered;
}
struct Base {
  ...
  mapping(bytes32 => ProtocolInfo) protocolInfo;
  ...
}
