Harpoon operations index (#984)

* added new baking/endorsing rights indexes

* added block level, delegate index

* corrected index

* corrected comment

sql/conseil.sql

@@ -706,6 +706,13 @@ CREATE INDEX ix_balance_updates_account_id ON tezos.balance_updates USING btree
 
 CREATE INDEX ix_balance_updates_block_level ON tezos.balance_updates USING btree (block_level);
 
+-- Index: ix_operations_block_level_delegate
+
+CREATE INDEX ix_operations_block_level_delegate
+    ON tezos.operations USING btree
+    (level ASC NULLS LAST, delegate COLLATE pg_catalog."default" ASC NULLS LAST)
+    TABLESPACE pg_default;
+
 --
 -- Name: accounts accounts_block_id_fkey; Type: FK CONSTRAINT; Schema: tezos; Owner: -
 --