First off, thanks for making this fork to keep the package alive.

When I generate a diagram with several tables, where Table A Column B foreign keys to Table C Column D, I had expected to get a line from B to D. Instead a line is drawn from A to C without regard for which rows of the tables contain B and D. Is this the kind of thing that might be easily fixable or is it more of a fundamental limitation of the underlying libraries being used to generate the diagram?