i want to

1. go through a certain web pages
2. get simple data

(already have js code in greasemonkey that does walking and data retrival)
3. have a way to store this data in a simple DB
4. have a way for my "crawler" to check this DB contents while it's web travels
5. would be nice if it is created as a one simlpe tool, i do not want to spend my time trynig to make my DB work than to make it communicate with the crawling code etc.

solutions? how would you do it?