Investigate Metabase for Metrics related needs

[martinklepsch]

Metabase seems like it could be pretty useful for extracting metrics from our data in Postgres.

Note that there are two ways of doing metrics:

1. Track events; derive some insight from those events
2. Analyze state of a database, derive insight from that state

This would fall into category 2.. For certain kinds of analytics 1. might be more suitable but the perfect solution probably combines both approaches.

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