perf: drop json output support

sdgb-cli/src/main.rs

@@ -363,9 +363,48 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
         }
         #[cfg(feature = "fetchall")]
         Commands::ScrapeAllB50Dump {} => {
-            use crate::{cache::B50, utils::helpers::dump_json};
+            use sdgb_api::title::model::{MusicRating, MusicRatingFlatten};
 
-            dump_json::<GetUserRatingApiResp>("b50.json", B50)?;
+            use crate::{
+                cache::B50,
+                utils::helpers::{dump_parquet, read_cache},
+            };
+
+            let records: Vec<GetUserRatingApiResp> = read_cache(B50)?;
+            dump_parquet::<MusicRatingFlatten>(
+                records
+                    .into_iter()
+                    .map(
+                        |GetUserRatingApiResp {
+                             user_id,
+                             user_rating,
+                         }| {
+                            user_rating
+                                .rating_list
+                                .into_iter()
+                                .chain(user_rating.next_rating_list)
+                                .map(
+                                    move |MusicRating {
+                                              music_id,
+                                              level,
+                                              rom_version,
+                                              achievement,
+                                          }| {
+                                        MusicRatingFlatten {
+                                            user_id,
+                                            music_id,
+                                            level,
+                                            rom_version,
+                                            achievement,
+                                        }
+                                    },
+                                )
+                        },
+                    )
+                    .flatten()
+                    .collect::<Vec<_>>(),
+                "b50.parquet",
+            )?;
         }
 
         Commands::Userdata {