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An online checker is ruled out because it would take too much server space. I don't think this would take up as much server space, but I'm not a techie so I wouldn't know.
The idea is that in a clan, any members that have not logged in for 7 days will have a warning symbol next to their name in the clan rankings.
Again, it's for privacy issues. It's each player's right to be inactive and not inform the whole game about it. If you want to check someone's inactivity, check the donations, the attacks and most importantly, the activity in war. If you are a clan which has wars constantly, then the disengagement of a member can clearly be seen by the number of wars he skipped.