TR_INV_CONTENT: Where on earth is the data actually stored?

I understand I can build functionality in this table so it will pop-up as an option in Production Elements.

However, I am trying to write a custom report that will reference this information and am lost on how to actually pull the data that I've populated in these fields under each performance.

Example, the Text_1 through Text_4 columns display in T_INVENTORY. When I populate these fields in Production Elements, that data exists in that table. But where on earth is TR_INV_CONTENT??

Is there any easy way of searching for tables like this in the future through SQL when it's not in either system tables or in the Tessitura Help Documents?