Sogo Mineo hit some test failures because of a broken sqlite3 module. He writes:

At the beginning of
daf_persistence/13.0-2-g7f7a1db+1/python/lsst/daf/persistence/registries.py ,
"haveSqlite3" was set to False because "import sqlite3" failed.

At line 77, the IF block was skipped because "haveSqlite3" is False.
The execution continued to reach line 89,
and PosixRegistry(root="filename.sqlite3") was created.

I think one of the following modifications is desirable:

1. Raise error when "not haveSqlite3 and re.match(r'.*\.sqlite3', location)"
before line 77.

2. Alter os.path.exists(location) to os.path.isdir(location) at line 88.

Line numbers refer to the HSC master branch, at https://github.com/HyperSuprime-Cam/daf_persistence