Denormalizing in Cassandra

First revision (Secondary Index)
==================================
Store objects in one CF, and index in another.

Note: In Cassandra 0.7, using a secondary index for columns id:google, id:fb, id:myspace would eliminate the need for UserIndex.

Users
------

"e0ee3406d83c11dfa47e002219990fd7": {
   "name": "Joe User",
   "email": "joe.user@example.com",
   ...
   "id:google": "joeuser@gmail.com",
   "id:fb": "joeuser",
   "id:myspace"": "omgjoe",
   ...
}

UserTransactions (CompareBy=TimeUUID)
-----------------------------------------
"e0ee3406d83c11dfa47e002219990fd7": {
  "40459394-d83e-11df-aacd-002219990fd7": "DATADATADATADATADATA"
  "59af962c-d83e-11df-ad2e-002219990fd7": "ATADATADATADATADATAD"
  "59d55c22-d83e-11df-924a-002219990fd7": "TADATADATADATADATADAT"
  "59eb3736-d83e-11df-b53e-002219990fd7": "ADATADATADATADATADATA"
  ...
}


UserIndex (Could be replaced with sec. idx in 0.7)
-----------------------------------------------------

"google:joeuser@gmail.com": {
  "UUID": "e0ee3406d83c11dfa47e002219990fd7"
},
"fb:joeuser": {
  "UUID": "e0ee3406d83c11dfa47e002219990fd7"
},
"myspace:omgjoe": {
  "UUID": "e0ee3406d83c11dfa47e002219990fd7"
},