Optimized diff scan by not pulling the whole track columns

src/libs/database/impl/Track.cpp

@@ -258,6 +258,25 @@ namespace lms::db
         return utils::fetchQuerySingleResult(session.getDboSession()->query<Wt::Dbo::ptr<Track>>("SELECT t from track t").where("t.absolute_file_path = ?").bind(p));
     }
 
+    std::optional<FileInfo> Track::findFileInfo(Session& session, const std::filesystem::path& p)
+    {
+        session.checkReadTransaction();
+
+        auto query{ session.getDboSession()->query<std::tuple<int, Wt::WDateTime>>("SELECT t.scan_version, t.file_last_write FROM track t WHERE t.absolute_file_path = ?") };
+        query.bind(p);
+
+        std::optional<FileInfo> result;
+
+        utils::forEachQueryResult(query, [&](const auto& row) {
+            FileInfo info;
+            info.scanVersion = std::get<0>(row);
+            info.lastWrittenTime = std::get<1>(row);
+            result = info;
+        });
+
+        return result;
+    }
+
     Track::pointer Track::find(Session& session, TrackId id)
     {
         session.checkReadTransaction();

src/libs/database/include/database/Track.hpp

@@ -191,6 +191,7 @@ namespace lms::db
         // Find utility functions
         static std::size_t getCount(Session& session);
         static pointer findByPath(Session& session, const std::filesystem::path& p);
+        static std::optional<FileInfo> findFileInfo(Session& session, const std::filesystem::path& p);
         static pointer find(Session& session, TrackId id);
         static void find(Session& session, TrackId& lastRetrievedId, std::size_t count, const std::function<void(const Track::pointer&)>& func, MediaLibraryId library = {});
         static void find(Session& session, const IdRange<TrackId>& idRange, const std::function<void(const Track::pointer&)>& func);

src/libs/database/include/database/Types.hpp

@@ -114,6 +114,12 @@ namespace lms::db
         std::string name;
     };
 
+    struct FileInfo
+    {
+        Wt::WDateTime lastWrittenTime;
+        std::size_t scanVersion{};
+    };
+
     enum class ArtistSortMethod
     {
         None,