diff --git a/models/evm/silver/core/silver_evm__transfers.sql b/models/evm/silver/core/silver_evm__transfers.sql
index 7fb9bb0..b193102 100644
--- a/models/evm/silver/core/silver_evm__transfers.sql
+++ b/models/evm/silver/core/silver_evm__transfers.sql
@@ -1,9 +1,9 @@
 {{ config(
     materialized = 'incremental',
     incremental_strategy = 'delete+insert',
-    unique_key = "block_number",
+    unique_key = "transfers_id",
     cluster_by = ['block_timestamp::DATE', '_inserted_timestamp::DATE'],
-    post_hook = "ALTER TABLE {{ this }} ADD SEARCH OPTIMIZATION ON EQUALITY(tx_hash, origin_function_signature, origin_from_address, origin_to_address, contract_address, from_address, to_address, symbol), SUBSTRING(origin_function_signature, contract_address, from_address, to_address, symbol)",
+    post_hook = "ALTER TABLE {{ this }} ADD SEARCH OPTIMIZATION ON EQUALITY(tx_hash, origin_function_signature, origin_from_address, origin_to_address, contract_address, from_address, to_address, symbol)",
     tags = ['core']
 ) }}