select
block_timestamp::date as date,
count(distinct instruction:parsed:info:stakeAuthority) as number_of_accounts
from solana.events
where block_timestamp::date >= '2022-02-01'
and event_type = 'delegate'
and instruction:parsed:info:voteAccount = 'DfpdmTsSCBPxCDwZwgBMfjjV8mF8xHkGRcXP8dJBVmrq'
group by 1
order by 1