diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000000000000000000000000000000000000..94faf4d6dc743141ee72b1b5ba0c280d900b8d74
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,60 @@
+{
+    "files.associations": {
+        "array": "cpp",
+        "atomic": "cpp",
+        "bit": "cpp",
+        "*.tcc": "cpp",
+        "cctype": "cpp",
+        "chrono": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "codecvt": "cpp",
+        "condition_variable": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "list": "cpp",
+        "map": "cpp",
+        "set": "cpp",
+        "unordered_map": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "algorithm": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "memory": "cpp",
+        "memory_resource": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "fstream": "cpp",
+        "initializer_list": "cpp",
+        "iomanip": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "thread": "cpp",
+        "cinttypes": "cpp",
+        "typeinfo": "cpp"
+    }
+}
diff --git a/interfaces/inner_api/notification_constant.h b/interfaces/inner_api/notification_constant.h
index 22aa43d4062f29124d753efdac09f0bd5e270bc4..e3593f178fc7f2bace9becc3a37fb72610d4e1ff 100644
--- a/interfaces/inner_api/notification_constant.h
+++ b/interfaces/inner_api/notification_constant.h
@@ -196,6 +196,8 @@ public:
     /* one hour */
     static const int64_t DEFAULT_AUTO_DELETE_TIME = 3600;
 
+    static const int64_t NO_DELAY_DELETE_TIME = 0;
+
     static constexpr uint64_t INVALID_TIMER_ID = 0ULL;
 
     // live view max size is 512KB(extra size) + 8KB(base size) = 520KB