refactor(web3): add migrations sql

Author: lingcoder

migrations/20251202014000_normalize_web3_ethereum_addresses.up.sql

@@ -0,0 +1,17 @@
+-- Normalize Ethereum addresses in provider_id to lowercase to prevent case-sensitivity issues
+-- This migration must run BEFORE deploying the code change that lowercases addresses in parser.go
+-- Background: Ethereum addresses are case-insensitive, but EIP-55 uses mixed case for checksums.
+-- This migration ensures existing checksummed addresses are normalized to lowercase to match
+-- the new behavior where addresses are lowercased at parse time.
+--
+-- Note: identity_data is NOT updated because it's only metadata for display purposes.
+-- The provider_id field is the only field used for identity lookup and uniqueness.
+
+/* auth_migration: 20251202014000 */
+
+-- Update all web3:ethereum provider_id entries to use lowercase addresses
+-- Format: "web3:ethereum:0xABCDEF..." -> "web3:ethereum:0xabcdef..."
+update {{ index .Options "Namespace" }}.identities
+set provider_id = lower(provider_id)
+where provider = 'web3'
+  and provider_id LIKE 'web3:ethereum:0x%';