Headtube dent, how safe is it? See picture below, I am in this situation with a new alluminium frame (don't ask me how I ended up here, it's a heartbreaking story.) It’s a Cinelli Mash Parallax.

The headtube has a dent and I don't know exactly what caused it, but the frame has allegedly never been used.
With a bit of a stronger push than usual, my lbs mechanic managed to fit the headset. As for now, the bearings don't seem to be compressed by the dent, but I am still worried. I am going to ride this bike on the track, so I want it to be very reliable. 

How safe is it? Do you suggest I try to fix the dent or will I only make it worse?



More photos here: https://imgur.com/a/JdZKwU1
The dent is not in a high stress area.

If the headset turns OK, I would ride it.

Inspect regularly for cracks, both near the crack as well as the welded side of the headset.