BOTH caliper bolts came completely undone? Very very odd and def not due to lack of blue Loctite/threadlocker. Shear failure is way more common on those bolts (especially during removal - not fun). How long had it been since you or any qualified mechanic last inspected them/the area?
Sure, many say it is overkill, but now you better understand why Porsche calls to replace caliper carrier bolts (stretch bolts) each time. People often think/feel knowing/having [even] 100% vehicle history grants calculated leeway to forego replacement. Is the juice really worth the squeeze though? Especially in your case w a 25 year old vehicle with who knows how many previous brake removals may have been completed on these bolts... Were I to ever re-use bolts... anti-seize would be preferable to thread locker anyhow due to heat and dissimilar metals. Simply, replacement is very cheap insurance.
Anyhow, at minimum you need to rebuild (or buy a rebuilt) caliper for that corner as:
(a) you had a failure for unknown reasons (why caliper bolts went awol)
(b) caliper is def now hanging up w pad dragging
Causation = correlation? Maybe?
Again, cheap insurance on 50% of the two vital components (tires being other) keeping you safe on the road.
Good luck
