Reset the database sequences for all plugins.
This is required (and automatically called) on a postgres after
restoring from a snapshot (
restore.py) because this operation
specifies explicit primary keys.
sqlsequencereset command this does not just
output the SQL statements, it also executes them. And it works always
on all plugins so you don't need to specify their names.
This is functionally equivalent to the following:
python manage.py sqlsequencereset APP1 APP2... | python manage.py shell
On SQLite or MySQL this command does nothing.
In PostgreSQL, Sequence objects are special single-row tables created with CREATE SEQUENCE. Sequence objects are commonly used to generate unique identifiers for rows of a table (exceprt from PostgreSQL docs).
(This module's source code is available here.)