Lev Berman fe0a4c494b
Problem: No MongoDB support for election ID index. (#2507)
Solution: Election ID has to be unique but not every validator set record has it. MongoDB does not support partial indexes, does not even allow for multiple Nones. This is a temporary fix since we are introducing an `election` collection to store election IDs in #2498.
2018-09-03 15:09:16 +02:00
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