You don't need to set affinity if you enable only sqlite module. Since you are not using mysql server then you can disable mysql module. The only thing you need to do is to set sql host in your plugin to "127.0.0.1" (database user and database password don't matter).
Data is saved in: addons\amxmodx\data\sqlite3\<database_name>.s q3
You can edit it using sqlite database editor. For example this one:
http://sqlitebrowser.sourceforge.net/
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