Remove Urls from a Database

It is possible to remove individual urls from an existing database. The command line syntax is:
asearch [options] database-path remove url1[*] [url2[*]][url3[*] ...]
For example:
asearch /usr/alkaline/data/ remove http://www.foo.com/file.html

You can remove an entire site or subdirectory by passing an url ending with a *. For example:
asearch /usr/alkaline/data/ remove http://www.foo.com/*