Track chain average block times about callisto HOT 4 CLOSED

@RiccardoM Good. And then it would be like:

1. block operation on x/consensus?
2. Take the latest block time from database
3. Calculate block time
4. Put it into database

I think putting block height on table should be a good idea along with timestamp

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@HarleyAppleChoi Yes, having a block operation inside x/consensus seems the best thing to do. The steps you described are correct 💯

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@RiccardoM the calculation is correct but only the overall average block time has to be calculated on every block, which

average_time = (BlockTime - GenesisTime) / BlockHeight

And I suppose the other average block times can be done on every min, every hour and every day instead of on every new block. In the current version, we have a timer dispatch a function every second. If the current time is at 0 second of every min, 0 second of every hour and 00:00 of every day, it will make those calculations.

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@kwunyeung Great, thanks!

@HarleyAppleChoi Please implement the calculations as periodic operations then. Leave only the overall average one (the one against the genesis time) inside the block handler.

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