SQLite reads a file: URI's path only up to the first ? or #, and
decodes %XX escapes in it. With a data directory such as
/srv/hooks#1, every database opened the one file /srv/hooks. The
connection string is now built with url.URL, which escapes the path,
and OmitHost keeps a relative path relative.
A test opens two databases in a directory whose name holds #, ? and %,
and checks through PRAGMA database_list that each opened its own file.
Model: opus-5-5
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