Added a dedicated table for release artists + handle display names in UI/Subsonic API, ref #731

src/libs/database/impl/Migration.cpp

@@ -35,7 +35,7 @@ namespace lms::db
 {
     namespace
     {
-        static constexpr Version LMS_DATABASE_VERSION{ 102 };
+        static constexpr Version LMS_DATABASE_VERSION{ 103 };
     }
 
     VersionInfo::VersionInfo()
@@ -1681,6 +1681,31 @@ FROM track)");
         utils::executeCommand(*session.getDboSession(), "ALTER TABLE podcast_episode ADD bits_per_sample INTEGER");
     }
 
+    void migrateFromV102(Session& session)
+    {
+        // New link to artists from releases
+        utils::executeCommand(*session.getDboSession(), R"(CREATE TABLE IF NOT EXISTS "release_artist_link" (
+  "id" integer primary key autoincrement,
+  "version" integer not null,
+  "artist_name" text not null,
+  "artist_sort_name" text not null,
+  "artist_mbid_matched" boolean not null,
+  "release_id" bigint,
+  "artist_id" bigint,
+  constraint "fk_release_artist_link_release" foreign key ("release_id") references "release" ("id") on delete cascade deferrable initially deferred,
+  constraint "fk_release_artist_link_artist" foreign key ("artist_id") references "artist" ("id") on delete cascade deferrable initially deferred
+    ))");
+
+        // Remove all artist links where the link type is TrackArtistLinkType::ReleaseArtist = 8
+        utils::executeCommand(*session.getDboSession(), R"(DELETE FROM track_artist_link WHERE type = 8)");
+
+        // Remove outdated UI state entries
+        utils::executeCommand(*session.getDboSession(), R"(DELETE FROM ui_state WHERE item = 'artists_link_type')");
+
+        // Just increment the scan version of the settings to make the next scan rescan all audio files
+        utils::executeCommand(*session.getDboSession(), "UPDATE scan_settings SET audio_scan_version = audio_scan_version + 1");
+    }
+
     bool doDbMigration(Session& session)
     {
         constexpr std::string_view outdatedMsg{ "Outdated database, please rebuild it (delete the .db file and restart)" };
@@ -1759,6 +1784,7 @@ FROM track)");
             { 99, migrateFromV99 },
             { 100, migrateFromV100 },
             { 101, migrateFromV101 },
+            { 102, migrateFromV102 },
         };
 
         bool migrationPerformed{};