Product

id     |    name   |     day    |    time
1      |    prod1  |     MON    |    08:30
2      |    prod1  |     MON    |    09:30
3      |    prod1  |     TUE    |    10:30
4      |    prod2  |     WED    |    05:30
5      |    prod3  |     MON    |    11:30

prod1 {
     "MON" : [
          08:30,
          09:30
      ],
     "TUE" : [
          10:30
      ]
}