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=head2 Lock

In Dochazka, a "lock" is a record in the "locks" table specifying that
a particular user's attendance data (i.e. activity intervals) for a 
given period (tsrange) cannot be changed. That means, for intervals in 
the locked tsrange:

=over

=item * existing intervals cannot be updated or deleted

=item * no new intervals can be inserted

=back

Employees can create locks (i.e., insert records into the locks table) on their
own EID, but they cannot delete or update those locks (or any others).
Administrators can insert, update, or delete locks at will.

How the lock is used will differ from site to site, and some sites may not