text: from django.db import models
  from datetime import datetime
  from api.samples.models import Sample
  
  class TrackType(models.Model):
      name = models.CharField(max_length=255)
      
      class Meta:
          db_table = 'ucsc_track_types'
  
  class Track(models.Model):
      sample = models.ForeignKey(Sample, on_delete=models.CASCADE)
      track_type = models.ForeignKey(TrackType, on_delete=models.CASCADE)
      url = models.CharField(max_length=255)
  
      class Meta:
          db_table = 'ucsc_tracks'
  