From ord version 0.20.1 to version 0.21.0 some users have run into problems indexing. I've tested it myself on our dev server and it stopped at block 375000 (doesn't finish the commit), others reported 350000, 430000 and 815000. We update redb from 2.1.3 in ord 0.20.1 to redb 2.1.4 in ord 0.21.0 and we think that might be the culprit.

Here's the tracking issue and the version update commit.

I've now pinned redb to version 2.1.3 here and running the index seems to work again.