SSD should be routinely trimmed (TODO: reference).
This can be set up by installing git:bluelight:scripts/Miscellany/fstrim.sh as /usr/local/sbin/fstrim.sh and creating daily cron job /etc/cron.daily/fstrim (root:root 755) to run it:
#!/bin/bash
# Blue Light daily cron job
# fstrim.sh can be time consuming so background and delay it
(sleep 300; /usr/local/sbin/fstrim.sh)&