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InfluxDB
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Did you have a look at Oberon? This is the language Prof. Wirth especially conceived for education of computer science students at ETH Zurich where it was successfully used for many years; also some other universities adopted it. If you don't like the original syntax, there is also a more modern version incl. IDE and debugger, still adhering to simplicity: https://github.com/rochus-keller/Oberon
PL/SQL and Ada are powerful languages but rather complex and likely not well suited for beginner courses. Delphi is great, but actually I prefer the type-bound procedure notation introduced with Oberon-2 and also adopted by Go. The original Oberon syntax is a bit old-fashioned, but there is a more modern variant, Oberon+, which supports both the old and more modern syntax and a few more streamlined Oberon-style features, and should appeal more to the younger generations. See https://github.com/oberon-lang/specification.