Make sure all values in the sensordatastore are of type int64_t (i.e. signed integer)!

DCDBLib/include/sensordatastore.h

@@ -41,7 +41,7 @@ class SensorDataStoreReading
 public:
   SensorId sensorId;
   DCDBTimeStamp timeStamp;
-  uint64_t value;
+  int64_t value;
 
 #if 0
   inline bool operator == (const SensorDataStoreReading& rhs) const {
@@ -69,7 +69,7 @@ public:
      * @param ts       The timestamp of the sensor reading.
      * @param value    The value of the sensor reading.
      */
-    void insert(SensorId* sid, uint64_t ts, uint64_t value);
+    void insert(SensorId* sid, uint64_t ts, int64_t value);
     
     /**
      * @brief Set the TTL for newly inserted sensor data.

DCDBLib/include_internal/sensordatastore_internal.h

@@ -43,9 +43,9 @@ public:
    * @brief This function inserts a sensor reading into the database
    * @param sid    The SensorId object representing the sensor (typically obtained from topicToSid)
    * @param ts     The timestamp of the reading (nanoseconds since Unix epoch)
-   * @param value  The sensor reading as 64-bit unsigned integer
+   * @param value  The sensor reading as 64-bit integer
    */
-  void insert(SensorId* sid, uint64_t ts, uint64_t value);
+  void insert(SensorId* sid, uint64_t ts, int64_t value);
 
   /**
    * @brief This function sets the TTL of newly inserted readings.

DCDBLib/src/sensordatastore.cpp

@@ -102,7 +102,7 @@ void SensorDataStoreImpl::prepareInsert(uint64_t ttl)
  * Applications should not call this function directly, but
  * use the insert function provided by the SensorDataStore class.
  */
-void SensorDataStoreImpl::insert(SensorId* sid, uint64_t ts, uint64_t value)
+void SensorDataStoreImpl::insert(SensorId* sid, uint64_t ts, int64_t value)
 {
 #if 0
   std::cout << "Inserting@SensorDataStoreImpl (" << sid->raw[0] << " " << sid->raw[1] << ", " << ts << ", " << value << ")" << std::endl;
@@ -203,7 +203,7 @@ void SensorDataStoreImpl::query(std::list<SensorDataStoreReading>& result, Senso
 
           entry.sensorId = sid;
           entry.timeStamp = DCDBTimeStamp((uint64_t)ts);
-          entry.value = (uint64_t)value;
+          entry.value = (int64_t)value;
 
           result.push_back(entry);
 #if 0
@@ -309,7 +309,7 @@ SensorDataStoreImpl::~SensorDataStoreImpl()
  * forwards to the insert function of the SensorDataStoreImpl
  * class.
  */
-void SensorDataStore::insert(SensorId* sid, uint64_t ts, uint64_t value)
+void SensorDataStore::insert(SensorId* sid, uint64_t ts, int64_t value)
 {
     impl->insert(sid, ts, value);
 }