Add index on auction id (#2386)

# Description @fhenneke [reported](cowprotocol/solver-rewards#337) that the batch rewards query takes forever once we removed the `auction_transaction` table. cowprotocol/solver-rewards#334 This should be fixed by adding the index on `auction_id` on `settlements` table. ## How to test Execute batch rewards on staging db to verify the speed.
cowprotocol · Feb 9, 2024 · b78d9fd · b78d9fd
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diff --git a/database/README.md b/database/README.md
@@ -318,6 +318,7 @@ During the solver competition solvers promise a solution of a certain quality. I
 
 Indexes:
 - PRIMARY KEY: btree(`block_number`, `log_index`)
+- settlements\_auction\_id: btree(`auction_id`)
 
 ### settlement\_scores
 

diff --git a/database/sql/V062__settlements_auction_id_index.sql b/database/sql/V062__settlements_auction_id_index.sql
@@ -0,0 +1,2 @@
+-- Optimization for when we JOIN settlements on auction_id.
+CREATE INDEX settlements_auction_id ON settlements USING BTREE (auction_id);
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		@@ -0,0 +1,2 @@
		-- Optimization for when we JOIN settlements on auction_id.
		CREATE INDEX settlements_auction_id ON settlements USING BTREE (auction_id);