Remove and add indexes

Author: kderme

schema/migration-3-0004-20240603.sql

@@ -1,2 +1,3 @@
 
 CREATE INDEX IF NOT EXISTS idx_committee_member_committee_id ON committee_member (committee_id);
+CREATE INDEX IF NOT EXISTS idx_pool_update_registered_tx_id ON pool_update (registered_tx_id);

schema/migration-4-0004-20210116.sql

@@ -1,6 +1,5 @@
 
 -- Indexes which optimize inserting new rewards
-CREATE INDEX IF NOT EXISTS idx_stake_address_hash_raw ON stake_address(hash_raw) ;
 CREATE INDEX IF NOT EXISTS idx_delegation_active_epoch_no ON delegation(active_epoch_no) ;
 CREATE INDEX IF NOT EXISTS idx_pool_update_reward_addr ON pool_update(reward_addr_id) ;
 CREATE INDEX IF NOT EXISTS idx_pool_update_active_epoch_no ON pool_update(active_epoch_no) ;