diff --git a/openspec/changes/add-g5-independent-write/specs/db/spec.md b/openspec/changes/add-g5-independent-write/specs/db/spec.md
index 6ecdc62..c010006 100644
--- a/openspec/changes/add-g5-independent-write/specs/db/spec.md
+++ b/openspec/changes/add-g5-independent-write/specs/db/spec.md
@@ -60,4 +60,15 @@
 #### Scenario: G5 room_status 使用 hotel_id 与 room_id 冲突键
 - **WHEN** 系统写入 `room_status.room_status_moment_g5`
 - **THEN** 应使用 `(hotel_id, room_id)` 作为 `ON CONFLICT` 的冲突键
-- **AND** 应将 `device_id` 作为普通可更新列写入
\ No newline at end of file
+- **AND** 应将 `device_id` 作为普通可更新列写入
+
+#### Scenario: G5 room_status 写入时强制 online_status 为 1
+- **WHEN** 系统向 `room_status.room_status_moment_g5` 插入新行或因冲突执行更新
+- **THEN** 应将 `online_status` 写为 `1`
+- **AND** 该规则仅作用于 G5 room_status 路径
+
+#### Scenario: G5 room_status 每包数据都触发更新时间刷新
+- **WHEN** 系统收到任意一包属于同一 `(hotel_id, room_id)` 的 G5 room_status 数据
+- **THEN** 即使业务字段与现存记录完全一致，也应执行一次 `ON CONFLICT DO UPDATE`
+- **AND** 不应在 G5 room_status 的冲突更新路径上使用“字段无变化则跳过 UPDATE”的 WHERE 条件
+- **AND** 应依赖数据库触发器自动刷新 `ts_ms`
\ No newline at end of file
diff --git a/src/db/databaseManager.js b/src/db/databaseManager.js
index bbb6944..448ec73 100644
--- a/src/db/databaseManager.js
+++ b/src/db/databaseManager.js
@@ -785,7 +785,7 @@ class DatabaseManager {
   }
 
   _buildRoomStatusUpsertQuery(events, target) {
-    const { tableName, conflictColumns, includeGuid, tableRef } = target;
+    const { tableName, conflictColumns, includeGuid, tableRef, forceOnlineStatusOnWrite, forceUpdateOnConflict } = target;
     const columns = this._getRoomStatusBaseColumns();
     const uniqueEventsMap = new Map();
 
@@ -804,29 +804,43 @@ class DatabaseManager {
       return { sql: null, values: [], uniqueEvents: [] };
     }
 
-    const allColumns = includeGuid ? [...columns, 'guid'] : [...columns];
+    const allColumns = forceOnlineStatusOnWrite ? [...columns, 'online_status'] : [...columns];
+    if (includeGuid) {
+      allColumns.push('guid');
+    }
     const updateColumns = columns.filter((column) => !['ts_ms', ...conflictColumns].includes(column));
-    const updateSet = updateColumns.map((column) => `${column} = EXCLUDED.${column}`).join(', ');
+    const updateAssignments = updateColumns.map((column) => `${column} = EXCLUDED.${column}`);
+    if (forceOnlineStatusOnWrite) {
+      updateAssignments.push('online_status = 1');
+    }
+    const updateSet = updateAssignments.join(', ');
     const whereConditions = updateColumns.map((column) => `${tableRef}.${column} IS DISTINCT FROM EXCLUDED.${column}`).join(' OR ');
 
     const values = [];
     const placeholders = uniqueEvents.map((event, eventIndex) => {
       const rowValues = this._roomStatusToRowValues(event);
+      if (forceOnlineStatusOnWrite) {
+        rowValues.push(1);
+      }
       values.push(...rowValues);
       const start = eventIndex * rowValues.length;
       const params = rowValues.map((_, valueIndex) => `$${start + valueIndex + 1}`).join(', ');
       return includeGuid ? `(${params}, gen_random_uuid())` : `(${params})`;
     }).join(', ');
 
+    const whereClause = forceUpdateOnConflict
+      ? ''
+      : `
+      WHERE
+        ${tableRef}.ts_ms <= EXCLUDED.ts_ms
+        AND (${whereConditions})`;
+
     const sql = `
       INSERT INTO ${tableName} (${allColumns.join(', ')})
       VALUES ${placeholders}
       ON CONFLICT (${conflictColumns.join(', ')})
       DO UPDATE SET
-        ${updateSet}
-      WHERE
-        ${tableRef}.ts_ms <= EXCLUDED.ts_ms
-        AND (${whereConditions})
+        ${updateSet}${whereClause}
     `;
 
     return { sql, values, uniqueEvents };
@@ -876,6 +890,8 @@ class DatabaseManager {
       includeGuid: true,
       autoCreatePartitions: true,
       tableRef: this.config.roomStatusTable ?? 'room_status.room_status_moment',
+      forceOnlineStatusOnWrite: false,
+      forceUpdateOnConflict: false,
       logPrefix: 'upsertRoomStatus',
     });
   }
@@ -887,6 +903,8 @@ class DatabaseManager {
       includeGuid: false,
       autoCreatePartitions: false,
       tableRef: this.config.roomStatusTable ?? 'room_status.room_status_moment_g5',
+      forceOnlineStatusOnWrite: true,
+      forceUpdateOnConflict: true,
       logPrefix: 'upsertRoomStatusG5',
     });
   }
diff --git a/test/dualWrite.test.js b/test/dualWrite.test.js
index e79f12b..898a477 100644
--- a/test/dualWrite.test.js
+++ b/test/dualWrite.test.js
@@ -589,12 +589,47 @@ describe('DatabaseManager: room_status upsert SQL', () => {
       includeGuid: false,
       autoCreatePartitions: false,
       tableRef: 'room_status.room_status_moment_g5',
+      forceOnlineStatusOnWrite: true,
+      forceUpdateOnConflict: true,
       logPrefix: 'upsertRoomStatusG5',
     });
     assert.match(built.sql, /ON CONFLICT \(hotel_id, room_id\)/);
     assert.doesNotMatch(built.sql, /ts_ms = EXCLUDED\.ts_ms/);
     assert.equal(/guid/.test(built.sql), false);
   });
+
+  it('forces online_status to 1 for g5 room_status insert and update', () => {
+    const dm = new DatabaseManager({ host: 'x', port: 5432, user: 'x', password: 'x', database: 'x', roomStatusTable: 'room_status.room_status_moment_g5' });
+    const built = dm._buildRoomStatusUpsertQuery([buildBasePayload()], {
+      tableName: 'room_status.room_status_moment_g5',
+      conflictColumns: ['hotel_id', 'room_id'],
+      includeGuid: false,
+      autoCreatePartitions: false,
+      tableRef: 'room_status.room_status_moment_g5',
+      forceOnlineStatusOnWrite: true,
+      forceUpdateOnConflict: true,
+      logPrefix: 'upsertRoomStatusG5',
+    });
+    assert.match(built.sql, /INSERT INTO room_status\.room_status_moment_g5 \(.*online_status\)/s);
+    assert.match(built.sql, /online_status = 1/);
+    assert.equal(built.values[built.values.length - 1], 1);
+  });
+
+  it('always updates g5 room_status on conflict even when business fields are unchanged', () => {
+    const dm = new DatabaseManager({ host: 'x', port: 5432, user: 'x', password: 'x', database: 'x', roomStatusTable: 'room_status.room_status_moment_g5' });
+    const built = dm._buildRoomStatusUpsertQuery([buildBasePayload()], {
+      tableName: 'room_status.room_status_moment_g5',
+      conflictColumns: ['hotel_id', 'room_id'],
+      includeGuid: false,
+      autoCreatePartitions: false,
+      tableRef: 'room_status.room_status_moment_g5',
+      forceOnlineStatusOnWrite: true,
+      forceUpdateOnConflict: true,
+      logPrefix: 'upsertRoomStatusG5',
+    });
+    assert.doesNotMatch(built.sql, /room_status\.room_status_moment_g5\.ts_ms <= EXCLUDED\.ts_ms/);
+    assert.doesNotMatch(built.sql, /IS DISTINCT FROM EXCLUDED/);
+  });
 });
 
 describe('DatabaseManager: insertHeartbeatEventsDual', () => {