Fix transmit history file to get removed on factory reset

src/mesh/NodeDB.cpp

@@ -17,6 +17,7 @@
 #include "Router.h"
 #include "SPILock.h"
 #include "SafeFile.h"
+#include "TransmitHistory.h"
 #include "TypeConversions.h"
 #include "error.h"
 #include "main.h"
@@ -509,6 +510,12 @@ bool NodeDB::factoryReset(bool eraseBleBonds)
     }
 #endif
     spiLock->unlock();
+
+    // rmDir above nuked the .dat file, but TransmitHistory's in-memory
+    // cache auto-flushes every 5 min and would resurrect it.
+    if (transmitHistory) {
+        transmitHistory->clear();
+    }
     // second, install default state (this will deal with the duplicate mac address issue)
     installDefaultNodeDatabase();
     installDefaultDeviceState();

src/mesh/TransmitHistory.cpp

@@ -255,6 +255,21 @@ bool TransmitHistory::saveToDisk()
     return false;
 }
 
+void TransmitHistory::clear()
+{
+    history.clear();
+    lastMillis.clear();
+    dirty = false;
+    lastDiskSave = 0; // so the next legit broadcast persists immediately
+
+    spiLock->lock();
+    if (FSCom.exists(FILENAME)) {
+        FSCom.remove(FILENAME);
+    }
+    spiLock->unlock();
+    LOG_INFO("TransmitHistory: cleared in-memory state + on-disk file");
+}
+
 #else
 // No filesystem available — provide stub with in-memory tracking
 TransmitHistory *transmitHistory = nullptr;
@@ -290,4 +305,10 @@ bool TransmitHistory::saveToDisk()
     return true;
 }
 
+void TransmitHistory::clear()
+{
+    history.clear();
+    lastMillis.clear();
+}
+
 #endif

src/mesh/TransmitHistory.h

@@ -76,6 +76,13 @@ class TransmitHistory
      */
     bool saveToDisk();
 
+    /**
+     * Wipe in-memory throttle state + remove the on-disk file. Required
+     * alongside rmDir("/prefs") in factoryReset — otherwise the 5-min
+     * auto-flush resurrects the file from the still-populated maps.
+     */
+    void clear();
+
   private:
     TransmitHistory() = default;