And thank YOU for using the Community Forum @genghisken!! 
“Alerts & Brokers” is already a sub-category (of Science) and we don’t have sub-sub-categories, but all technical discussions like you described could carried out by starting new topics in the Alerts & Brokers category.
You’re right that tags are also useful for this situation. I only found a few relevant existing tags (alert, brokers, and sql) but more can easily be made. I can see that your user account, @genghisken, has a trust level of three which means you can create new tags.