Add forecast occupancy logic for room availability range APIs

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

@@ -30,6 +30,37 @@ interface RoomStayRepo : JpaRepository<RoomStay, UUID> {
         @Param("toAt") toAt: java.time.OffsetDateTime
     ): List<UUID>
 
+    @Query("""
+        select distinct rs.room.id
+        from RoomStay rs
+        where rs.property.id = :propertyId
+          and rs.isVoided = false
+          and rs.toAt is not null
+          and rs.fromAt < :toAt
+          and rs.toAt > :fromAt
+    """)
+    fun findOccupiedRoomIdsBetweenClosed(
+        @Param("propertyId") propertyId: UUID,
+        @Param("fromAt") fromAt: java.time.OffsetDateTime,
+        @Param("toAt") toAt: java.time.OffsetDateTime
+    ): List<UUID>
+
+    @Query("""
+        select rs.room.id as roomId,
+               rs.fromAt as fromAt,
+               b.expectedCheckoutAt as expectedCheckoutAt
+        from RoomStay rs
+        join rs.booking b
+        where rs.property.id = :propertyId
+          and rs.isVoided = false
+          and rs.toAt is null
+          and rs.fromAt < :toAt
+    """)
+    fun findActiveForecastRows(
+        @Param("propertyId") propertyId: UUID,
+        @Param("toAt") toAt: java.time.OffsetDateTime
+    ): List<ActiveRoomStayForecastRow>
+
     @Query("""
         select rs
         from RoomStay rs
@@ -163,3 +194,9 @@ interface BookingRoomNumberRow {
     val bookingId: UUID
     val roomNumber: Int
 }
+
+interface ActiveRoomStayForecastRow {
+    val roomId: UUID
+    val fromAt: java.time.OffsetDateTime
+    val expectedCheckoutAt: java.time.OffsetDateTime?
+}