Fix index for ethflow_orders table (#2836)

# Description Previously index was created on a wrong table: "orders" instead of "ethflow_orders": https://github.com/cowprotocol/services/blob/main/database/sql/V031__create_ethflow_orders.sql#L11 Should speed up the OPEN_ORDERS query, although not sure how much.
cowprotocol · Jul 29, 2024 · 8e1e306 · 8e1e306
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diff --git a/database/README.md b/database/README.md
@@ -70,6 +70,7 @@ EthFlow orders get created with the very generic [`ICoWSwapOnchainOrders`](https
 
 Indexes:
 - PRIMARY KEY: btree(`uid`)
+- ethflow\_user\_valid\_to: btree(`valid_to`)
 
 ### ethflow\_refunds
 

diff --git a/database/sql/V067__create_index_on_ethflow_orders.sql b/database/sql/V067__create_index_on_ethflow_orders.sql
@@ -0,0 +1,5 @@
+-- To get all valid orders quickly, we create an index
+CREATE INDEX ethflow_user_valid_to ON ethflow_orders USING BTREE (valid_to);
+
+-- Remove wrongly added index in V031__create_ethflow_orders.sql
+DROP INDEX user_valid_to;