bool setData(const QModelIndex &index, const QVariant &value, int role);
bool setDataForRow(int row, const DateWeight &dw);
void setWeightForDate(const QDate &date, double weight);
void setWeightForDate(const DateWeight &dw);
bool setData(const QModelIndex &index, const QVariant &value, int role);
bool setDataForRow(int row, const DateWeight &dw);
void setWeightForDate(const QDate &date, double weight);
void setWeightForDate(const DateWeight &dw);