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You probably did some manual data importing, even if not, it’s not problem with django, but with database auto increment sequence. Django has a management command that generates sql command to reset those:
./manage.py sqlsequencereset myapp1 myapp2
If you are using PostgreSQL you can just pipe it in like that:
./manage.py sqlsequencereset myapp1 myapp2 | psql
or mysql
if you are using MySQL, but I haven’t ried it.
Source:stackexchange.com