Hi!
You can extract it with
> \lo_export 200936761 'somefile'
>
> in psql and examine the file.
>
> Ask the people who use that database!
Tried
root(at)c202-76:~# ./pgsqlkaiv.sh
psql (12.2 (Debian 12.2-2.pgdg100+1))
Type "help" for help.
sba=# \lo_export 200936761 'large200936761'
lo_export
sba=# \q
root(at)c202-76:~# ls -l large*
-rw-r--r-- 1 root root 0 veebr 2 10:45 large200936761
result file size is 0 .
Andrus.