add models generation and josn print

app/model/prestadb/ps_unit.go

@@ -0,0 +1,18 @@
+// Code generated by gorm.io/gen. DO NOT EDIT.
+// Code generated by gorm.io/gen. DO NOT EDIT.
+// Code generated by gorm.io/gen. DO NOT EDIT.
+
+package prestadb
+
+const TableNamePsUnit = "ps_unit"
+
+// PsUnit mapped from table <ps_unit>
+type PsUnit struct {
+	IDUnit    int32 `gorm:"column:id_unit;primaryKey;autoIncrement:true" json:"id_unit"`
+	Precision int32 `gorm:"column:precision;not null" json:"precision"`
+}
+
+// TableName PsUnit's table name
+func (*PsUnit) TableName() string {
+	return TableNamePsUnit
+}