old_contents: {
      PDBConst.Name: "bill",
      PDBConst.Columns: [
      {
          PDBConst.Name: "ID",
          PDBConst.Attributes: ["int", "not null", "auto_increment", "primary key"]
      },
      {
          PDBConst.Name: "Datetime",
          PDBConst.Attributes: ["datetime", "not null"]
      },
      {
          PDBConst.Name: "Amount",
          PDBConst.Attributes: ["double(12,2)", "not null"]
      },
      {
          PDBConst.Name: "Currency",
          PDBConst.Attributes: ["tinyint", "not null", "default 1"]
      },
      {
          PDBConst.Name: "Category",
          PDBConst.Attributes: ["tinyint"]
      },
      {
          PDBConst.Name: "PaymentMode",
          PDBConst.Attributes: ["tinyint"]
      },
      {
          PDBConst.Name: "Note",
          PDBConst.Attributes: ["varchar(255)"]
      }]
  }
  
new_contents: {
      PDBConst.Name: "bill",
      PDBConst.Columns: [
      {
          PDBConst.Name: "ID",
          PDBConst.Attributes: ["int", "not null", "auto_increment", "primary key"]
      },
      {
          PDBConst.Name: "PID",
          PDBConst.Attributes: ["int", "not null"]
      },
      {
          PDBConst.Name: "Datetime",
          PDBConst.Attributes: ["datetime", "not null"]
      },
      {
          PDBConst.Name: "Amount",
          PDBConst.Attributes: ["double(12,2)", "not null"]
      },
      {
          PDBConst.Name: "Currency",
          PDBConst.Attributes: ["tinyint", "not null", "default 1"]
      },
      {
          PDBConst.Name: "Category",
          PDBConst.Attributes: ["tinyint"]
      },
      {
          PDBConst.Name: "PaymentMode",
          PDBConst.Attributes: ["tinyint"]
      },
      {
          PDBConst.Name: "Note",
          PDBConst.Attributes: ["varchar(255)"]
      }]
  }
  
subject: Fix bill table missed column