If you replaced databases.cfg after the installer was run (such as by reinstalling Sourcemod), that would lose the section.
I recommend re-running the psstats autoinstaller. Don't use the upgrade version, and it will put back in the section for you.
ill be honest im bascially lost this is the first time ive ever delt with a server so lol t he 2 stat installers i have are "HLStatsX plugin for SourcMod" and "Physcostats Interface Plugin(rearmed)"
i also have a section that says "Stats manager"