D-4

v-1.0
---
1. refresh DB

    ==> done
D-4

v-2.0
---
1. option item
    1. drop table: cm7
    2. create table

	    ==> done
D-4

v-2.1
---
1. modify: AI.java, table: cm7

	    ==> done
D-4

v-2.2
---
1. MODIFY => table: refresh_history
	==> Time values => TEXT

	    ==> done