Ref T237, find latest DB cache ts and only init caches if there are no or old cache data

src/blackcore/application.cpp

@@ -865,11 +865,18 @@ namespace BlackCore
             m_webDataServices.reset(
                 new CWebDataServices(m_webReadersUsed, m_dbReaderConfig, {}, this)
             );
+            Q_ASSERT_X(m_webDataServices, Q_FUNC_INFO, "Missing web services");
 
             // caches from local files (i.e. the files delivered)
             if (this->isInstallerOptionSet())
             {
-                msgs.push_back(m_webDataServices->initDbCachesFromLocalResourceFiles(false));
+                const QDateTime ts = m_webDataServices->getLatestDbEntityCacheTimestamp();
+                if (!ts.isValid() || ts < QDateTime::currentDateTimeUtc().addYears(-2))
+                {
+                    // we only init, if there are:
+                    // a) no cache timestamps b) or it was not updated for some years
+                    msgs.push_back(m_webDataServices->initDbCachesFromLocalResourceFiles(false));
+                }
             }
 
             // watchdog

src/blackcore/application.h

@@ -262,7 +262,7 @@ namespace BlackCore
         //! Delegates to QCommandLineParser::isSet
         bool isParserOptionSet(const QString &option) const;
 
-        //! Installer called?
+        //! Called by installer?
         bool isInstallerOptionSet() const;
 
         //! Delegates to QCommandLineParser::isSet

src/blackcore/webdataservices.cpp

@@ -419,6 +419,22 @@ namespace BlackCore
         return reader->getLatestEntityTimestampFromSharedInfoObjects(entity);
     }
 
+    QDateTime CWebDataServices::getLatestDbEntityCacheTimestamp() const
+    {
+        QDateTime latest;
+        const CEntityFlags::EntitySet set = CEntityFlags::asSingleEntities(CEntityFlags::AllDbEntitiesNoInfoObjects);
+        for (CEntityFlags::Entity e : set)
+        {
+            const QDateTime ts = this->getCacheTimestamp(e);
+            if (!ts.isValid()) { continue; }
+            if (!latest.isValid() || latest < ts)
+            {
+                latest = ts;
+            }
+        }
+        return latest;
+    }
+
     CEntityFlags::Entity CWebDataServices::getEntitiesWithNewerSharedFile(CEntityFlags::Entity entities) const
     {
         Q_ASSERT_X(m_sharedInfoDataReader, Q_FUNC_INFO, "Shared info reader was not initialized");

src/blackcore/webdataservices.h

@@ -77,8 +77,7 @@ namespace BlackCore
     /*!
      * Encapsulates reading data from web sources
      */
-    class BLACKCORE_EXPORT CWebDataServices :
+    class BLACKCORE_EXPORT CWebDataServices : public QObject
-        public QObject
     {
         Q_OBJECT
 
@@ -385,11 +384,17 @@ namespace BlackCore
         //! \threadsafe
         QDateTime getCacheTimestamp(BlackMisc::Network::CEntityFlags::Entity entity) const;
 
+        //! Latest DB object timestamp, or null if there is no such timestamp
+        //! \threadsafe
+        QDateTime getLatestDbEntityCacheTimestamp() const;
+
         //! Corresponding DB timestamp if applicable
+        //! \remark from Db::CInfoDataReader
         //! \threadsafe
         QDateTime getLatestDbEntityTimestamp(BlackMisc::Network::CEntityFlags::Entity entity) const;
 
         //! Shared info object timestamp
+        //! \remark from Db::CInfoDataReader
         //! \threadsafe
         QDateTime getLatestSharedInfoObjectTimestamp(BlackMisc::Network::CEntityFlags::Entity entity) const;