There's barr bodies, chimerism, all kinds of mutation - missense, nonsense, point deletes, repeats -, there's somatic recombination, slipping of strands, transposomes, polyploidy... you name it.
But I think talking at this level ignores the science and overwhelming statistics of SNP databases. You're not going to move around within the database over time.
I made a comment about V(D)J recombination just the other day:
https://news.ycombinator.com/item?id=21053657
There's barr bodies, chimerism, all kinds of mutation - missense, nonsense, point deletes, repeats -, there's somatic recombination, slipping of strands, transposomes, polyploidy... you name it.
But I think talking at this level ignores the science and overwhelming statistics of SNP databases. You're not going to move around within the database over time.