(fix): duplications in pool_stat table in db-sync

Author: Ciabas

govtool/backend/sql/get-network-total-stake.sql

@@ -67,8 +67,16 @@ TotalStakeControlledByActiveDReps AS (
         AND COALESCE(rd.deposit, 0) >= 0
         AND ((DRepActivity.epoch_no - GREATEST(COALESCE(lve.epoch_no, 0), COALESCE(rd.epoch_no, 0))) <= DRepActivity.drep_activity)
 ),
+-- it's a fix for duplication issue https://github.com/IntersectMBO/cardano-db-sync/issues/1986
+LatestPoolStat AS (
+    SELECT DISTINCT ON (pool_hash_id) *
+    FROM
+        pool_stat
+    WHERE
+        epoch_no = (SELECT MAX(no) FROM epoch)
+),
 TotalStakeControlledBySPOs AS (
-    SELECT SUM(ps.stake)::bigint AS total FROM pool_stat ps WHERE ps.epoch_no = (SELECT no FROM CurrentEpoch)
+    SELECT SUM(ps.stake)::bigint AS total FROM LatestPoolStat ps WHERE ps.epoch_no = (SELECT no FROM CurrentEpoch)
 ),
 AlwaysAbstainVotingPower AS (
     SELECT COALESCE((SELECT amount FROM drep_hash

govtool/backend/sql/list-proposals.sql

@@ -122,6 +122,14 @@ RankedPoolVotes AS (
         vp.tx_id DESC,
         vp.id DESC
 ),
+-- it's a fix for duplication issue https://github.com/IntersectMBO/cardano-db-sync/issues/1986
+LatestPoolStat AS (
+    SELECT DISTINCT ON (pool_hash_id) *
+    FROM
+        pool_stat
+    WHERE
+        epoch_no = (SELECT MAX(no) FROM epoch)
+),
 PoolVotes AS (
     SELECT
         rpv.gov_action_proposal_id,
@@ -132,10 +140,10 @@ PoolVotes AS (
         SUM(CASE WHEN rpv.vote = 'Yes' THEN ps.voting_power ELSE 0 END) AS poolYesVotes,
         SUM(CASE WHEN rpv.vote = 'No' THEN ps.voting_power ELSE 0 END) AS poolNoVotes,
         SUM(CASE WHEN rpv.vote = 'Abstain' THEN ps.voting_power ELSE 0 END) AS poolAbstainVotes
-    FROM 
+    FROM
         RankedPoolVotes rpv
-    JOIN 
-        pool_stat ps
+    JOIN
+        LatestPoolStat ps
         ON rpv.pool_voter = ps.pool_hash_id
     WHERE
         ps.epoch_no = (SELECT MAX(no) FROM epoch)