为基于事件的分析设计数据库模式

I'm trying to figure out the best way to model the schema for this event-based analytics system I'm writing. My main concern is writing this in a way that makes queries simple and fast. I'm going to be using MySQL as well. I'll go over some of the requirements and present an outline of a possible (but I think poor) schema. I'm trying to figure out the best way to model