A very annoying part of the work has been finished today.
There was an issue with player connection data being composed of 660.000 rows, as the player data script store the position of the players on a per-system basis. On the instant it's very useful data, but a few weeks later there is not really any reason to continue to keep this data pinpoint accurate as players travel a lot around and can often revisit the same system during the same session. We went from 660.000 rows to 193.000 rows, which should definitely make things run much better !