database is largely a meta tag. Unlike the spreadsheet tag, its definition doesn't cover a non-meta usage, although there is some non-meta usage among the questions. It looks like the vast majority of usage is as an unnecessary, redundant tag when an application-specific tag is also used. After some recent cleanup, there are probably 350 questions (out of about 400 remaining) for which the tag is unnecessary.
As far as the database tag, itself, it should be retained and the wiki excerpt modified to limit its application to specific non-meta uses.