Django admin panel records disappearing

Hello,

I am using the Django admin tool as an internal tool to reach into a remote database.

Most of my models work perfectly with the save. method additions I have added, but there are 2 that are not working.

What happens is that the admin screen gives a successful "save" message, but the grid view doesn't show any records.

When I click on the entry in the right hand "Recent changes" list, it says:

Change learner batch back to draft with ID "None" doesn't exist. Perhaps it was deleted?

Any advice on why this is happening would be welcome :)

Here is the model in question:

class ChangeLearnerBatchBackToDraft(models.Model):

ticket_number = models.CharField(max_length=10, default='')

provider_accreditation_num = models.CharField(max_length=30)

batch_id = models.CharField(max_length=30)

notes_log = models.TextField(default="No notes added", editable=False)

def save(self, *args, **kwargs):

try:

commando_conn = psycopg2.connect(f"dbname='{DB}' user='{USER}' host='{HOST}' password='{PASS}'")

commando_cur = commando_conn.cursor()

commando_cur.execute(f"select * from res_partner where provider_accreditation_num='{self.provider_accreditation_num}';")

res = commando_cur.fetchone()

real_provider_id = res[0]

self.notes_log = self.notes_log+f"\n{real_provider_id}\n"

except Exception as e:

raise AssertionError(e)

def __str__(self):

return str(self.provider_accreditation_num)+" - "+str(self.batch_id)

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