boomer77luna stddev
    Updated 2021-08-03
    with luna as
    (SELECT
    date_trunc('day',block_timestamp) as days, avg(event_amount) as amt, avg(event_amount_usd) as usd, usd/amt as LUNA_price
    from terra.transfers
    where event_currency = 'LUNA'
    group by 1)

    select
    days, stddev(luna_price)
    from luna
    group by 1
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