How to inverse Y axis [on hold]

I have a SQLlite database containing cached tiles with X,Y,Z fields and I want to use it in MapCache. My Y field is appearing upside down in Google tile index but I want to inverse it like this:

http://www.maptiler.org/google-maps-coordinates-tile-bounds-projection/

I'm searching for a way to use my databse in Mapcache or inverse Y field in database to adapt tile indexes with mapcache tile index.