The problem with databases is that they exist forever while governments, your elected leaders, and laws do not.  While you may feel smug in knowing you will not break the law, that is beside the point.  What is legal today can be rendered illegal tomorrow.  There are enough examples in other countries and in other times of firearms which were once legal for citizens to possess being made illegal and subject to confiscation - all with the stroke of a pen.  Each time this happened, the societies and governments involved all thought themselves to be reasonable and civilized too.

"Your papers please."