Reset primary key auto_increment [duplicate]

Answer 1

[...] then insert entities force the id to begin from id=1 again?

You can ALTER TABLE like this:

ALTER TABLE t1 AUTO_INCREMENT = 1;

Documentation here: MySQL ALTER TABLE Syntax

Answer 2

Try truncate table http://dev.mysql.com/doc/refman/5.1/en/truncate-table.html

This resets auto_increment columns back to 0.