I logged off 11 hours ago (at the time of this post) and the base was intact with walls, barrels, watchtower, construction lights and farm plots.
Now all of these are gone. Only som plant materials remain. It got wiped in some server crash or restart during these 11 hours.
Crash or restart server, I don't know.
We also lost a base on Klen mountain today, on the same server. Walls, watch tower, car tent, 2 x barrels in the vicinity, 1 buried stash. All seemed to vanish at the same instant. Everything was ok at ~1200h Central European time (checked in-game), and it was gone directly after the restart/crash at 1556h. This may have been when 'it' happened.