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Re:Ask HN: What problem in your industry is a potential star... by thomasdub on Friday December 09, 2016 @07:11PM (#13143041)
This sounds very like Redmine [0]. It's ostensibly for project "issues" however it's extremely customizable and all of the above are included in the default config and not much more. It sounds like if you removed about 2 default fields it'd be perfect for the ticketing system you describe above. Plus RSS + Notifications + a solid API.

[0] http://www.redmine.org/

Re:Ask HN: What problem in your industry is a potential star... by naasking on Saturday December 10, 2016 @08:06AM (#13145478)
Even the older Trac has all of those features.