(Once a month)
You go into your Qt and make a new address and send all your coins to yourself
Depending on how many "transactions" you have, you might have to send it to yourself in 2,3,4,5 etc chunks but if your doing this regularly you can do it all at once.
You can send it to the same address to consolidate - no biggy - multiple addresses not required
I do it for all my POS coins, once a month or so
(Once a year)
Also - once a year, you should shut-down/exit the Qt
Go into %appdata% and rename your wallet.dat file to walletOLD.dat
Restart the Qt and it will make a new wallet.dat file
Make a new address and copy it so you can send all your POS coins to this new address in the new wallet.dat [file]
Shut-down/exit the Qt
Go into %appdata% and rename this new wallet.dat file to walletNEW.dat
Rename the walletOLD.dat file to wallet.dat
Restart the Qt
Now send ALL your POS coins to this new address that you just created.
Once this wallet is empty, Shut-down/exit the Qt
Go into %appdata% and rename this wallet.dat file to walletOLD.dat
Rename the walletNEW.dat file to wallet.dat
Restart the Qt and you'll see all your coins now in the wallet :-)
DONE
You should never delete the old wallet.dat files, just-in-case you have a few addresses still in the wild that somebody might try to use/send coins to you.
You should open these old wallets once a year and check them for any coins
The reason you have to do all of this is because any Qt does not like to get really full. It can lag and in really really full Qt's with a LOT of addresses, it can crash, making the wallet.dat file unstable and even possibly unusable. Better safe than sorry.
If some thing here is unclear - feel free to ask :-)
Thanks for that guide. Id like to add some more: one "transaction" in your wallet = one generated block. So if you have 1 transaction in your wallet with 70 KSC, your coin would generate 1 POS block and you'll have to wait 7 hours to genarate stake again. But if you split your coin into 700 transactions (0.1 KSC each), you will get the same reward, but you'll have enough transactions in your wallet to support the network for all 24 hours.
You can see all your transactions in "Coin control" menu.
I see that this is another thing we must change. User dont have to do all that things manually, it's too complicated. We will do something to this in the next releases.