Given the following models:

class Stream(models.Model):
    name = models.CharField(max_length=32)
    label = models.CharField(max_length=32)
    ...

class Data(models.Model):
    class Meta:
        ordering = ['timestamp']
    timestamp = models.DateTimeField(db_index=True)  # in UTC !
    data = models.FloatField()
    stream = models.ForeignKey(to=Stream, editable=False)
    ...

I need to output results in the following (CSV) format:

Example output:

Timestamp,A,B,C,D
2017/03/03:00:01:00,4,2,1.9,3
2017/03/03:00:01:15,4,3,1.8.3
...

A,B,C and D are streams labels.

Values are from Data.data field.