I have to say, this is a very uncommon situation. I have never seen a radiator behind a sink or heard of a movable sink table.  I guess you have your reasons, but would it be easier to put doors on the front of the "sink table" so you can access the plumbing etc without moving it?

With that said, the first thing I'd recommend would be replacing the wood board with a rot proof composite or PVC board. I'd add a 2 or 3 inch vertical splash board around the opening by the heater so water and objects won't fall down behind the sink. With the sink in place, maybe you could use a thin bead of acrylic door/window caulk to seal it to the wall and board.  If you find that you must move the sink on occasion, the acrylic caulk is easy to remove and simple to reapply. Another alternative you might try is  a strip of self adhesive rubber pillow style weather stripping to seal the gap between the sink and wall.    

What can I do about this gap between a wooden board and the sink?
I am currently creating a stored procedure that populates a table with a list of insert statements so that my DBAs can export the contents of the table to a text file and then paste the statements into SSMS and run (it is to copy data from test environment to live enviroment - I am constricted by the fact the 2 environments cannot see each other, bcp is not configured on the environment

My question is that the table I am going to export could have up to 2,000,000 insert statements. Is there a limit to what can be pasted in and run?
