Web map component

I am pulling markers from a database at the moment. I need my scrip to check the database every few minutes to see if there are new records, if there is, create a new marker for them. Likewise, if the marker no longer exists in the database, it shouldn't display on the map. The map viewer should be able to pan and zoom normally. Code should be neatly written and commented where appropriate. I expect the developer will have experience with Codeigniters MVC framework; and, can build on my current MVC. If successful, there will be ongoing work; maintenance and improvements, plus other modules we plan to build.