Many thanks for the reply - I have a bit of 'housekeeping' to do!
Indeed!
Here's a list of things I check for in the aircraft database:
AC contains 'null', '...', is blank or contains a number (for where AC and CN are switched)
AT contains 'null', '...' or is blank
AR contains 'null' or is blank
AN contains 'null', 'tie-in' (to cover GAS database 'tie-in from country' issue - these are usually on airframes.org) or is blank
I also go through and set airline names to uniform values for easier searching of logs i.e Easyjet, Easyjet Airlines and Easyjet Airline Company are all set to just Easyjet as they should be. If you check your daily logs you'll soon see which names need looking at.
Don't want to worry you but there are about 12k records in the database with AC set to just 'untitled'. I'm working through mine bit by bit and so far have found details for around 70% of the ones I've checked.
One last thing to consider. When I check mine I enter '?' in any fields that I can't find details for. This helps to prevent me from re-checking for details I've previously checked for. I'll then periodically focus on those records to check if new information has become available. It means I don't need to delete them from the database in the hope they'll auto update that way as well.