more codes

src/main/kotlin/com/android/trisolarisserver/repo/RoomStayRepo.kt

@@ -14,4 +14,17 @@ interface RoomStayRepo : JpaRepository<RoomStay, UUID> {
           and rs.toAt is null
     """)
     fun findOccupiedRoomIds(@Param("propertyId") propertyId: UUID): List<UUID>
+
+    @Query("""
+        select distinct rs.room.id
+        from RoomStay rs
+        where rs.property.id = :propertyId
+          and rs.fromAt < :toAt
+          and (rs.toAt is null or rs.toAt > :fromAt)
+    """)
+    fun findOccupiedRoomIdsBetween(
+        @Param("propertyId") propertyId: UUID,
+        @Param("fromAt") fromAt: java.time.OffsetDateTime,
+        @Param("toAt") toAt: java.time.OffsetDateTime
+    ): List<UUID>
 }