MessageContentKey_5 newKey = new MessageContentKey_5(msgId, _bytesSeenSoFar);
DatabaseEntry newKeyEntry = new DatabaseEntry();
newContentKeyTupleBinding.objectToEntry(newKey, newKeyEntry);
DatabaseEntry newValueEntry = new DatabaseEntry();
contentTB.objectToEntry(content, newValueEntry);
newContentDB.put(null, newKeyEntry, newValueEntry);
_prevMsgId = msgId;
_bytesSeenSoFar += contentSize;