Validation of property and property group entries

With the growing amount of properties stored within the FLARECAST database a new requirement arises to validate the quality of our data.
Hereby, an automation report could detect invalid/missing property/property group entries using the following metrics:

• Within a specific cadence we expect a series of continuous property groups.
  E.g. given the '24h'-cadence we expect (at least one) property group at ..., '2017-01-01', '2017-01-02', '2017-01-03', '2017-01-04', ...
• We expect a value (not in [0, null])] for the following property types:
  - ...