fix(#20): use inclusive query for rent payment month range

backend/src/main/java/fr/nessar/lmnporganizer/backend/repository/RentPaymentRepository.java

@@ -2,12 +2,14 @@ package fr.nessar.lmnporganizer.backend.repository;
 
 import fr.nessar.lmnporganizer.backend.model.RentPayment;
 import org.springframework.data.mongodb.repository.MongoRepository;
+import org.springframework.data.mongodb.repository.Query;
 import org.springframework.stereotype.Repository;
 
 import java.util.List;
 
 @Repository
 public interface RentPaymentRepository extends MongoRepository<RentPayment, String> {
+    @Query("{ 'leaseId': ?0, 'month': { $gte: ?1, $lte: ?2 } }")
     List<RentPayment> findAllByLeaseIdAndMonthBetween(String leaseId, String firstMonth, String lastMonth);
 
     List<RentPayment> findAllByOrderByDueDateAsc();

backend/src/test/java/fr/nessar/lmnporganizer/backend/integration/RentPaymentPersistenceIT.java

@@ -23,14 +23,10 @@ import java.util.List;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-@SpringBootTest(
-        classes = RentPaymentPersistenceIT.MongoTestApplication.class,
-        webEnvironment = SpringBootTest.WebEnvironment.NONE,
-        properties = {
-                "lmnp.data-initializer.enabled=false",
-                "spring.data.mongodb.auto-index-creation=true"
-        }
-)
+@SpringBootTest(classes = RentPaymentPersistenceIT.MongoTestApplication.class, webEnvironment = SpringBootTest.WebEnvironment.NONE, properties = {
+        "lmnp.data-initializer.enabled=false",
+        "spring.data.mongodb.auto-index-creation=true"
+})
 class RentPaymentPersistenceIT {
 
     private static final MongoDBContainer mongoDb = startMongoDb();
@@ -55,7 +51,8 @@ class RentPaymentPersistenceIT {
     void rejectsTwoRentPaymentsForTheSameLeaseAndMonth() {
         rentPaymentRepository.save(rentPayment("payment-1", "2026-06", LocalDate.of(2026, 6, 5)));
 
-        assertThatThrownBy(() -> rentPaymentRepository.save(rentPayment("payment-2", "2026-06", LocalDate.of(2026, 6, 5))))
+        assertThatThrownBy(
+                () -> rentPaymentRepository.save(rentPayment("payment-2", "2026-06", LocalDate.of(2026, 6, 5))))
                 .isInstanceOf(DuplicateKeyException.class);
     }
 
@@ -64,14 +61,26 @@ class RentPaymentPersistenceIT {
         rentPaymentRepository.saveAll(List.of(
                 rentPayment("payment-3", "2026-03", LocalDate.of(2026, 3, 5)),
                 rentPayment("payment-1", "2026-01", LocalDate.of(2026, 1, 5)),
-                rentPayment("payment-2", "2026-02", LocalDate.of(2026, 2, 5))
-        ));
+                rentPayment("payment-2", "2026-02", LocalDate.of(2026, 2, 5))));
 
         assertThat(rentPaymentRepository.findAllByOrderByDueDateAsc())
                 .extracting(RentPayment::getMonth)
                 .containsExactly("2026-01", "2026-02", "2026-03");
     }
 
+    @Test
+    void testBetweenBehavior() {
+        rentPaymentRepository.saveAll(List.of(
+                rentPayment("payment-1", "2026-01", LocalDate.of(2026, 1, 5)),
+                rentPayment("payment-2", "2026-02", LocalDate.of(2026, 2, 5)),
+                rentPayment("payment-3", "2026-03", LocalDate.of(2026, 3, 5))
+        ));
+
+        assertThat(rentPaymentRepository.findAllByLeaseIdAndMonthBetween("lease-1", "2026-01", "2026-03"))
+                .extracting(RentPayment::getMonth)
+                .containsExactly("2026-01", "2026-02", "2026-03");
+    }
+
     private static RentPayment rentPayment(String id, String month, LocalDate dueDate) {
         return new RentPayment(id, "default-landlord", "lease-1", month, dueDate,
                 new BigDecimal("850.00"), new BigDecimal("50.00"), null);