Will heavy duty testing and development cause my MB Air's SSD to crash soon? How to prevent it?
No. SSD that Apple ships are so much more reliable than the hard drives Apple ships (used to ship) that this is basically a non-issue. You still need a backup, failures still happen, but SSD have spare capacity and degrade gracefully, losing a little storage incrementally as they start to “fail”.

I've not heard of any early failures attributed to over use on 2010 and later SSD. I've also not even heard of documented cases of severe slow downs as explained here:


What happens at the user/OS level when an SSD finally wears out?


The controllers are apparently good enough and TRIM is recycling blocks in real-world situations to make SSD last as long as the computers. You might look at AppleCare to have Apple amortize the risk that you will wear your drive out in a 3 year period, but even with database writes, I'm not seeing developer machines fail prematurely. I also have no bad experience with SSD on servers and was surprised how well the Apple SSD are aging in general.