src/main/java/com/example/demo/repository/TransactionRepository.java

@@ -0,0 +1,7 @@
+package com.example.demo.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import com.example.demo.model.Transaction;
+
+public interface TransactionRepository extends JpaRepository<Transaction, Long> {
+}