diff --git a/CLC-qthing/IRSender.hpp b/CLC-qthing/IRSender.hpp
index b97ed7f696ada9cc73945622a1503437416ad66b..82ebf9a32d53e513b19619099ec5ab9f4e5767a2 100644
--- a/CLC-qthing/IRSender.hpp
+++ b/CLC-qthing/IRSender.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <cinttypes>
 
 #include <string>
diff --git a/CLC-qthing/SiliconTorch/CyanBusCRC.hpp b/CLC-qthing/SiliconTorch/CyanBusCRC.hpp
index 2b47a41f49b4791425a913b268825c9c82790735..2cf93e5513c644c7ddb7ac117eb66ff1f32cae8e 100644
--- a/CLC-qthing/SiliconTorch/CyanBusCRC.hpp
+++ b/CLC-qthing/SiliconTorch/CyanBusCRC.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 // C++ system level
 #include <cinttypes>
 
diff --git a/CLC-qthing/SiliconTorch/Metrics.cpp b/CLC-qthing/SiliconTorch/Metrics.cpp
index c2170fa4c3a0378f8d060ecb434057355e6f012e..0dce70f77bb3813e1ac811363d8b5fe553e315eb 100644
--- a/CLC-qthing/SiliconTorch/Metrics.cpp
+++ b/CLC-qthing/SiliconTorch/Metrics.cpp
@@ -103,6 +103,8 @@ namespace SiliconTorch {
       j["uptime"]   = uptime_ms() / 1000UL;
       j["lifetime"] = (lifeTime + (uptime_ms() - lifeTimeSaved)) / 1000UL;
 
+      if (birth > 0) j["birth"] = birth;
+
       publish_message(genDeviceTopic("metrics"), j.dump().c_str());
       lastPublished = uptime_ms();
     }
diff --git a/CLC-qthing/SiliconTorch/Metrics.hpp b/CLC-qthing/SiliconTorch/Metrics.hpp
index 116b8efc0fe87e1dbea7af2d74a1415fdde234b8..7b00f4193445b81fcb6cca54e817a4578e43d792 100644
--- a/CLC-qthing/SiliconTorch/Metrics.hpp
+++ b/CLC-qthing/SiliconTorch/Metrics.hpp
@@ -86,6 +86,8 @@ namespace SiliconTorch {
         uint32_t bootCnt           = 0;
         uint32_t bootCntSaveUptime = 60;           // seconds
 
+        uint64_t birth             = 0;            // unix timestamp of first device activation
+
         void tickTask();
         void saveBootCntTask();
 
diff --git a/CLC-qthing/SimpleUART.hpp b/CLC-qthing/SimpleUART.hpp
index 01e5ce5c9bb532a4d73afe94a25cb13156f7b3f7..a16e17dac9ee47498c93e90380a3ce2561da10eb 100644
--- a/CLC-qthing/SimpleUART.hpp
+++ b/CLC-qthing/SimpleUART.hpp
@@ -1,3 +1,4 @@
+#pragma once
 
 #include <cinttypes>