Created an interface for the Db class

src/libs/services/recommendation/impl/features/FeaturesEngine.cpp

@@ -24,7 +24,7 @@
 #include "core/ILogger.hpp"
 #include "core/Random.hpp"
 #include "database/Artist.hpp"
-#include "database/Db.hpp"
+#include "database/IDb.hpp"
 #include "database/Release.hpp"
 #include "database/Session.hpp"
 #include "database/Track.hpp"
@@ -37,7 +37,7 @@ namespace lms::recommendation
 {
     using namespace db;
 
-    std::unique_ptr<IEngine> createFeaturesEngine(Db& db)
+    std::unique_ptr<IEngine> createFeaturesEngine(db::IDb& db)
     {
         return std::make_unique<FeaturesEngine>(db);
     }