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Add a stake pool delegation history query #1437

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Add a stake pool delegation history query #1437

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30 changes: 30 additions & 0 deletions doc/interesting-queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -271,6 +271,36 @@ This shows that the first delegation became active (ie earning rewards) in epoch
address owner subsequently re-delegated their stake with those re-delegations becoming active in
epochs 214, 216 and 217.

### Get the delegation history for a specified stake pool
```sql
select pool_ticker, stake_address, max(from_epoch) as from_epoch, till_epoch
from (
select pod.ticker_name as pool_ticker, sa.view as stake_address, d.active_epoch_no as from_epoch,
first_value(ld.active_epoch_no) over (partition by sa.view, d.active_epoch_no order by ld.active_epoch_no asc) as till_epoch
from delegation d
left join delegation ld on ld.addr_id = d.addr_id
and ld.active_epoch_no >= d.active_epoch_no
and ld.pool_hash_id != d.pool_hash_id
inner join pool_hash ph on ph.id = d.pool_hash_id
inner join stake_address sa on sa.id = d.addr_id
inner join pool_offline_data pod on pod.pool_id = ph.id
where ph.view = 'pool1a8n7f97dmgtgrnl53exccknjdchqxrr9508hlxlgqp6xvjmzhej'
group by stake_address, pool_ticker, d.active_epoch_no, ld.active_epoch_no
) t
group by stake_address, pool_ticker, till_epoch
order by from_epoch;;
pool_ticker | stake_address | from_epoch | till_epoch
-------------+-------------------------------------------------------------+------------+------------
HAPPY | stake1u95rnek2jdhkslq5d6z6u7c3csdwf0jgpmf6wfun8fakdds8l94l2 | 389 |
HAPPY | stake1u9rq7cn7pdydmhr4rjr4r0x70mm8ltc09j3jc0mj9j7540q8nyvfk | 389 |
HAPPY | stake1uxdtkv4lzgn90yldfdv4ypz3s24tzj4dsprcgja3llfk75slp3ymz | 392 |
HAPPY | stake1ux0mymju4vnypz7ugn37h2f07ftvljwx442svrkprmtu5qs0hcv7p | 397 | 397
HAPPY | stake1uxf6eeg3f8swtjkacw2h24gq5ztxl92kdlmwysrrq7qadwcjgtrza | 404 | 413
HAPPY | stake1u9vzap5gdlqhmahperu4rsfj2zr8zwagun5ffrc9wyy50mcv0nth4 | 408 |
(6 rows)

```
The `'from_epoch'` is the epoch when the stake became active for the given pool. The `'till_epoch'` is the epoch when the stake became active in another pool. A `null` value in the `'till_epoch'` means that the stake is currently active. The same value in both `'from_epoch'` and `'till_epoch'` means that the stake was redelegated within the epoch.

### Get the reward history for a specified stake address

Expand Down