perf: drop json output support

sdgb-api/src/title/model/get_user_rating_api/mod.rs

@@ -66,6 +66,16 @@ pub struct MusicRating {
     pub achievement: i32,
 }
 
+#[cfg_attr(feature = "parquet", derive(parquet_derive::ParquetRecordWriter))]
+#[derive(Default, Debug, Clone, PartialEq)]
+pub struct MusicRatingFlatten {
+    pub user_id: u32,
+    pub music_id: u32,
+    pub level: u32,
+    pub rom_version: i64,
+    pub achievement: i32,
+}
+
 #[cfg_attr(feature = "bincode", derive(bincode::Encode, bincode::Decode))]
 #[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]

sdgb-api/src/title/model/mod.rs

@@ -18,6 +18,7 @@ pub use get_user_rating_api::{
     GetUserRatingApi,
     GetUserRatingApiResp, // api
     MusicRating,
+    MusicRatingFlatten,
     Udemae,
     UserRating,
 };