Reading external log files

My Synology NAS can receive and store log files so I set up my Balance to send them. The files are there and now I need to read them to look for a problem. I have these files:

SYNOSYSLOGDB_name.DB 1gb file
SYNOSYSLOGDB_name.DB-shm 32k file
SYNOSYSLOGDB_name.DB-wal 4mb file

I am used to seeing the router log display within the Balance graphical interface. Of course that only shows a limited amount of records.

How do I open the files above to see the history?

Hello.
Those are SQL database files.
wal extension == Write-Ahead Logging (SQLite) database!
https://www.sqlite.org/wal.html

the common way of reading these is pg_waldump