diff --git a/src/main/kotlin/com/android/trisolarisserver/component/RoomBoardEvents.kt b/src/main/kotlin/com/android/trisolarisserver/component/RoomBoardEvents.kt
new file mode 100644
index 0000000..115790f
--- /dev/null
+++ b/src/main/kotlin/com/android/trisolarisserver/component/RoomBoardEvents.kt
@@ -0,0 +1,86 @@
+package com.android.trisolarisserver.component
+
+import com.android.trisolarisserver.controller.dto.RoomBoardResponse
+import com.android.trisolarisserver.controller.dto.RoomBoardStatus
+import com.android.trisolarisserver.repo.RoomRepo
+import com.android.trisolarisserver.repo.RoomStayRepo
+import org.springframework.scheduling.annotation.Scheduled
+import org.springframework.stereotype.Component
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter
+import java.io.IOException
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CopyOnWriteArrayList
+
+@Component
+class RoomBoardEvents(
+    private val roomRepo: RoomRepo,
+    private val roomStayRepo: RoomStayRepo
+) {
+    private val emitters: MutableMap<UUID, CopyOnWriteArrayList<SseEmitter>> = ConcurrentHashMap()
+
+    fun subscribe(propertyId: UUID): SseEmitter {
+        val emitter = SseEmitter(0L)
+        emitters.computeIfAbsent(propertyId) { CopyOnWriteArrayList() }.add(emitter)
+        emitter.onCompletion { emitters[propertyId]?.remove(emitter) }
+        emitter.onTimeout { emitters[propertyId]?.remove(emitter) }
+        emitter.onError { emitters[propertyId]?.remove(emitter) }
+        try {
+            emitter.send(SseEmitter.event().name("room-board").data(buildSnapshot(propertyId)))
+        } catch (_: IOException) {
+            emitters[propertyId]?.remove(emitter)
+        }
+        return emitter
+    }
+
+    fun emit(propertyId: UUID) {
+        val data = buildSnapshot(propertyId)
+        val list = emitters[propertyId] ?: return
+        val dead = mutableListOf<SseEmitter>()
+        for (emitter in list) {
+            try {
+                emitter.send(SseEmitter.event().name("room-board").data(data))
+            } catch (_: IOException) {
+                dead.add(emitter)
+            }
+        }
+        if (dead.isNotEmpty()) {
+            list.removeAll(dead.toSet())
+        }
+    }
+
+    @Scheduled(fixedDelayString = "25000")
+    fun heartbeat() {
+        emitters.forEach { (_, list) ->
+            val dead = mutableListOf<SseEmitter>()
+            for (emitter in list) {
+                try {
+                    emitter.send(SseEmitter.event().name("ping").data("ok"))
+                } catch (_: IOException) {
+                    dead.add(emitter)
+                }
+            }
+            if (dead.isNotEmpty()) {
+                list.removeAll(dead.toSet())
+            }
+        }
+    }
+
+    private fun buildSnapshot(propertyId: UUID): List<RoomBoardResponse> {
+        val rooms = roomRepo.findByPropertyIdOrderByRoomNumber(propertyId)
+        val occupiedRoomIds = roomStayRepo.findOccupiedRoomIds(propertyId).toHashSet()
+        return rooms.map { room ->
+            val status = when {
+                room.maintenance -> RoomBoardStatus.MAINTENANCE
+                !room.active -> RoomBoardStatus.INACTIVE
+                occupiedRoomIds.contains(room.id) -> RoomBoardStatus.OCCUPIED
+                else -> RoomBoardStatus.FREE
+            }
+            RoomBoardResponse(
+                roomNumber = room.roomNumber,
+                roomTypeName = room.roomType.name,
+                status = status
+            )
+        }
+    }
+}
diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/BookingFlow.kt b/src/main/kotlin/com/android/trisolarisserver/controller/BookingFlow.kt
index 7ab790f..7a54173 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/BookingFlow.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/BookingFlow.kt
@@ -1,6 +1,7 @@
 package com.android.trisolarisserver.controller
 
 import com.android.trisolarisserver.component.PropertyAccess
+import com.android.trisolarisserver.component.RoomBoardEvents
 import com.android.trisolarisserver.controller.dto.BookingCancelRequest
 import com.android.trisolarisserver.controller.dto.BookingCheckInRequest
 import com.android.trisolarisserver.controller.dto.BookingCheckOutRequest
@@ -35,7 +36,8 @@ class BookingFlow(
     private val bookingRepo: BookingRepo,
     private val roomRepo: RoomRepo,
     private val roomStayRepo: RoomStayRepo,
-    private val appUserRepo: AppUserRepo
+    private val appUserRepo: AppUserRepo,
+    private val roomBoardEvents: RoomBoardEvents
 ) {
 
     @PostMapping("/{bookingId}/check-in")
@@ -100,6 +102,7 @@ class BookingFlow(
         if (request.notes != null) booking.notes = request.notes
         booking.updatedAt = now
         bookingRepo.save(booking)
+        roomBoardEvents.emit(propertyId)
     }
 
     @PostMapping("/{bookingId}/check-out")
@@ -128,6 +131,7 @@ class BookingFlow(
         if (request.notes != null) booking.notes = request.notes
         booking.updatedAt = now
         bookingRepo.save(booking)
+        roomBoardEvents.emit(propertyId)
     }
 
     @PostMapping("/{bookingId}/cancel")
diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/RoomStayFlow.kt b/src/main/kotlin/com/android/trisolarisserver/controller/RoomStayFlow.kt
index ee9b056..d4831b1 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/RoomStayFlow.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/RoomStayFlow.kt
@@ -1,6 +1,7 @@
 package com.android.trisolarisserver.controller
 
 import com.android.trisolarisserver.component.PropertyAccess
+import com.android.trisolarisserver.component.RoomBoardEvents
 import com.android.trisolarisserver.controller.dto.RoomChangeRequest
 import com.android.trisolarisserver.controller.dto.RoomChangeResponse
 import com.android.trisolarisserver.models.room.RoomStay
@@ -31,7 +32,8 @@ class RoomStayFlow(
     private val roomStayRepo: RoomStayRepo,
     private val roomStayChangeRepo: RoomStayChangeRepo,
     private val roomRepo: RoomRepo,
-    private val appUserRepo: AppUserRepo
+    private val appUserRepo: AppUserRepo,
+    private val roomBoardEvents: RoomBoardEvents
 ) {
 
     @PostMapping("/{roomStayId}/change-room")
@@ -98,6 +100,7 @@ class RoomStayFlow(
             idempotencyKey = request.idempotencyKey
         )
         val savedChange = roomStayChangeRepo.save(change)
+        roomBoardEvents.emit(propertyId)
         return toResponse(savedChange)
     }
 
diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/Rooms.kt b/src/main/kotlin/com/android/trisolarisserver/controller/Rooms.kt
index a3c9ff7..da0d42c 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/Rooms.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/Rooms.kt
@@ -1,6 +1,7 @@
 package com.android.trisolarisserver.controller
 
 import com.android.trisolarisserver.component.PropertyAccess
+import com.android.trisolarisserver.component.RoomBoardEvents
 import com.android.trisolarisserver.controller.dto.RoomAvailabilityRangeResponse
 import com.android.trisolarisserver.controller.dto.RoomAvailabilityResponse
 import com.android.trisolarisserver.controller.dto.RoomBoardResponse
@@ -26,6 +27,7 @@ import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.ResponseStatus
 import org.springframework.web.bind.annotation.RestController
 import org.springframework.web.server.ResponseStatusException
+import org.springframework.web.servlet.mvc.method.annotation.SseEmitter
 import java.time.LocalDate
 import java.time.ZoneId
 import java.util.UUID
@@ -38,7 +40,8 @@ class Rooms(
     private val roomStayRepo: RoomStayRepo,
     private val propertyRepo: PropertyRepo,
     private val roomTypeRepo: RoomTypeRepo,
-    private val propertyUserRepo: PropertyUserRepo
+    private val propertyUserRepo: PropertyUserRepo,
+    private val roomBoardEvents: RoomBoardEvents
 ) {
 
     @GetMapping
@@ -88,6 +91,16 @@ class Rooms(
         return if (isAgentOnly(roles)) mapped.filter { it.status == RoomBoardStatus.FREE } else mapped
     }
 
+    @GetMapping("/board/stream")
+    fun roomBoardStream(
+        @PathVariable propertyId: UUID,
+        @AuthenticationPrincipal principal: MyPrincipal?
+    ): SseEmitter {
+        requirePrincipal(principal)
+        propertyAccess.requireMember(propertyId, principal!!.userId)
+        return roomBoardEvents.subscribe(propertyId)
+    }
+
     @GetMapping("/availability")
     fun roomAvailability(
         @PathVariable propertyId: UUID,
@@ -177,7 +190,9 @@ class Rooms(
             notes = request.notes
         )
 
-        return roomRepo.save(room).toRoomResponse()
+        val saved = roomRepo.save(room).toRoomResponse()
+        roomBoardEvents.emit(propertyId)
+        return saved
     }
 
     @PutMapping("/{roomId}")
@@ -208,7 +223,9 @@ class Rooms(
         room.maintenance = request.maintenance
         room.notes = request.notes
 
-        return roomRepo.save(room).toRoomResponse()
+        val saved = roomRepo.save(room).toRoomResponse()
+        roomBoardEvents.emit(propertyId)
+        return saved
     }
 
     private fun requirePrincipal(principal: MyPrincipal?) {