If an app has multiple models with the same field, whats the best practice for keeping things DRY?

Question

For example, if I have 3 models that look like this:

class CallLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields


class EmailLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields


class TextLog(models.Model):
    lead_id = models.BigIntegerField("Lead ID")
    #  other fields

Do I add lead_id to each model individually or is there a way to only type it once?