Best way to completely remove akonadi/nepomuk/MySQL cache without reconfiguration?

Hi all,

right now, my KMail (4.11.2/4.11.3) right now is notoriously unreliable with 
regard to fetching mail (problems with akonadi after server disconnect, see 
other mails). Also, when e.g. running a 'akonadictl restart' from the command 
line, I get tons of messages like

akonadi_nepomuk_feeder(4874) ItemQueue::batchJobResult: Error while storing 
graph:  "http://www.semanticdesktop.org/ontologies/2007/03/22/nco#org has a 
max cardinality of 1. Provided 1 values - <nepomuk:/res/a5f0303f-
b196-4d7d-9291-f6f6ce32be93>. Existing - <nepomuk:/res/b47e115a-ff98-41d8-
aeeb-78f65df11f52>, <nepomuk:/res/664343f9-cb6e-4cf3-8bdc-4fcccebebaeb>"

I also get MySQL error messages about duplicated entries and many more. As 
I've just upgraded to 4.11.3, I would like to make a fresh start - but would 
not like to have to remove/re-add all accounts I'm using.

Is there an easy way to clean out the full akonadi/nepomuk/MySQL cache while 
still keeping the accounts configured?

Thanks in advance,

Thomas
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	Thomas Ribbrock, IT-Team brightsight
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