Sorry but that just doesnt happen. It would be extraordinarily difficult. BTW It’s 92011 not 92111. The sales prior to June 2005 for 92011 are in 92009. Even after the switch alot of the realtors still put listings in 92011 in 92009. Some still do today! Similarly, 92008 was split into 92008 and 92010 last year. Two years ago 92083 was split into 92083 and 92081 in Vista. Before that 92069 was split into 92069 and 92078 in San Marcos. These are just a few of the changes that make the data flawed in major ways. There are many many more challenges with the data then you could beleive.
Your statement that if they didnt restate things the MLS reports and statistics would be meaningless is not far from the truth. You really need an indepth knowledge about a specific area to know whats going on. All this analysis is good and fine but as I have said many times…there are numerous flaws in the data collection. The best analysis on what is going on still comes from an experienced, knowledgable local realtor or appraiser.