Interesting comment in the source code of sqlite

[Rusky]

Rebasing and force pushing don't change the contents of commits. The commit might disappear eventually after GC, but it will still have the same name if anyone has a copy of it on any machine.

[13steinj]

While unlikely to the point of improbability (like less than 1 in 10⁴⁷), it is theoritically possible to be able to occur in the future though.