id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
34926	Missing model after squashing	Sebastian Jekutsch	nobody	"Sorry for an unspecific subject and not searching for duplicates due to lack of knowledge, understanding and time.

As an excerpt from #34924 which has been correctly closed as duplicate for two of its issues, the third one remains unresolved, as far as I see. I reopen it with this new report.

Based on the attachments
1. Zip of single migrations 0001 to 0116
2. Resulting squashed migration file of ""manage.py squashmigrations knowledgebase 0116"" 
3. models.py at the end of 0116
within #34924,
I found that model Activity has errorneously disappeared completely in the squashed migration file. It has even not been detected by a new makemigrations run for cross-check.
"	Bug	new	Migrations	4.2	Normal				Unreviewed	0	0	0	0	0	0