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The monotonic uptime was used exclusively with caches and having a resolution of SECONDS allows it to be stored as an int without risk of wrapping (~68 years). Using MILLISECONDS meant that it would wrap after ~25 days which is totally possible and EXPECTED. Just as an example, the small test server I ran for about 1 month had ZERO downtime on the QueryManager except for when I manually restarted it. It was probably very close to wrapping when I took it down.
Tibia 7.7 Query Manager
This is a simple query manager designed to support Tibia Game Server, Tibia Login Server, and Tibia Web Server. It uses the SQLite3 3.50.2 amalgamation for a database backend so we can completely avoid having to spin up yet another service for a separate database system, effectively turning the query manager into the database itself. This design choice was made with a single game server in mind. The networking protocol is NOT encrypted at all and won't accept remote connections. For a fully multi-world distributed infrastructure, a distributed database system like PostgreSQL and MySQL/MariaDB should be considered.
Compiling
Even though there are no Linux specific features being used, it will currently only compile on Linux. It should be simple enough to support compiling on Windows but I don't think it would add any value, considering the game server needs to run on Linux and they need to be both on the same machine. The makefile is very simple and there are ZERO dependencies required. You can add the -j N switch to make it compile across N processes.
make # build in release mode
make DEBUG=1 # build in debug mode
make clean # remove `build` directory
Running
The query manager will automatically manage the database schema based on files in sql/ (see sql/README.txt), but won't automatically insert any initial data (see sql/init.sql). It does have a few configuration options that are loaded from config.cfg but the defaults should work for most use cases.
It is recommended that the query manager is setup as a service. There is a systemd configuration file (tibia-querymanager.service) in the repository that may be used for that purpose. The process is very similar to the one described in the Game Server so I won't repeat myself here.