Fix issue-153: Server crash and database corruption #165
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We can't use the Tuple CID as an IV because it changes when the tuple is deleted. If we have a trigger function that needs the deleted tuple, it will get the wrong IV when decrypting. This happens because the CID used to encrypt the tuple (during INSERT/UPDATE) is different from the CID passed to the decryption function (during delete).
To fix this, we need to stop using the CID for IV calculation.