WIP replaygain support

src/libs/database/impl/Session.cpp

@@ -40,7 +40,7 @@
 
 namespace Database {
 
-#define LMS_DATABASE_VERSION	21
+#define LMS_DATABASE_VERSION	22
 
 using Version = std::size_t;
 
@@ -246,6 +246,14 @@ CREATE TABLE "user_backup" (
 		{
 			_session.execute("DROP TABLE subsonic_settings");
 		}
+		else if (version == 21)
+		{
+			_session.execute("ALTER TABLE track ADD track_replay_gain REAL");
+			_session.execute("ALTER TABLE track ADD release_replay_gain REAL");
+
+			// Just increment the scan version of the settings to make the next scheduled scan rescan everything
+			ScanSettings::get(*this).modify()->incScanVersion();
+		}
 		else
 		{
 			LMS_LOG(DB, ERROR) << "Database version " << version << " cannot be handled using migration";