I would really like to use MySQL directly, but most of the data can be condensed to a tree before sending. And at 1mb of data it seems to be a good idea to compress it that way.
Example:
The table:
testid1, yada1, foo1
testid1, yada1, foo2
testid1, yada2, foo3
testid1, yada1, foo4
testid1, yada2, foo4
The structure:
$data{'testid1'}{'yada1'}{'foo1'}