simpler bucket-indices

Feature Merge Request (MR)

What does this MR add?

• 1. Instead of saving when a membership expires, we now store when the underlying assessment was completed. -> this avoids running into trouble when the concept's lifetime is changed!

• 1.1) for clairty it thus renames memberData.date -> assessmentDate

• 2. instead of having each concept start their list of timeslots (buckets) with index 0 (thereby making it relative to the concepts creationDate) each concept now discretizes time relative to unix-start-time (solidity's built-in now())
  • simplifies the formulas a lot

Related Issues

part of https://fathom/org/issues/82

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