Dear Sam,
thanks for mentioning the Hiveeyes project. I’m one of its members and the main author of the backend data acquisition and -visualization system Kotori. Feel free to ask me anything.
We are happy to provide further information as our system might be interesting to the TTN community for many different data acquisition tasks in the field of environmental monitoring and beyond. As it integrates InfluxDB, Grafana and more FOSS components in an elegant way, we also posted its description to the topic LABS - Store and visualize data using InfluxDB and Grafana.
I will try to respond to your list of specific requirements in the next post as good as i can.
With kind regards,
Andreas.