trabajando en la tabla de transferencias

src/main/resources/db/changelog/changesets/0010-drop-unique-tx-gateway.yml

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+databaseChangeLog:
+  - changeSet:
+      id: 0010-drop-unique-tx-gateway
+      author: JJO
+      changes:
+        # 1️⃣ Eliminar la UNIQUE constraint sobre (gateway_transaction_id, type)
+        - dropUniqueConstraint:
+            constraintName: uq_tx_gateway_txid_type
+            tableName: payment_transactions
+
+        # 2️⃣ Crear un índice normal (no único) sobre gateway_transaction_id
+        #    para poder seguir buscando rápido por este campo
+        - createIndex:
+            tableName: payment_transactions
+            indexName: idx_payment_tx_gateway_txid
+            columns:
+              - column:
+                  name: gateway_transaction_id
+
+      rollback:
+        # 🔙 1) Eliminar el índice normal creado en este changeSet
+        - dropIndex:
+            indexName: idx_payment_tx_gateway_txid
+            tableName: payment_transactions
+
+        # 🔙 2) Restaurar la UNIQUE constraint original
+        - addUniqueConstraint:
+            tableName: payment_transactions
+            columnNames: gateway_transaction_id, type
+            constraintName: uq_tx_gateway_txid_type