My CJKV database initially was compiled from many free distributing text tables that I could find. There are a lot of phonetic tables, dictionaries and CJK decomposition data. But of cource the main goal of such base is a defining the structure of Chinese ideographs. At bottom you can find two tables with decomposition for Ext A and Main Unicode CJK symbol sets.

CJK Decomposition for Unicode ExtA

CJK Decomposition for Unicode Main