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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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SLT
SLT is an IDE Plugin for Itellij/Jetbrains IDE lineup implementing support for Common Lisp via Slime/Swank and supported lisp interpret.
You could look into Paradigms of AI Programming by Peter Norvig which might interest you regardless of Lisp content.
When you want to do anything that breaks the nice bubble of your Lisp image, you might want to know a bit about your operating system's programming interface. This will come in handy if you ever need to wrap a library with CFFI. There are some things that are pretty inconvenient as a rule (like dealing with any protocol that uses network byte order), but if you stay within the bubble of your Lisp image, you won't really notice them.
Q4: the Cookbook should get you straight to the point: build a website, web scraper, DB access, reference of data structures… https://lispcookbook.github.io/cl-cookbook/
Shameless self plug: https://github.com/Enerccio/SLT