diff --git a/sdgb-api/src/title/model/get_user_rating_api/mod.rs b/sdgb-api/src/title/model/get_user_rating_api/mod.rs
index acfbe8c..7d93b81 100644
--- a/sdgb-api/src/title/model/get_user_rating_api/mod.rs
+++ b/sdgb-api/src/title/model/get_user_rating_api/mod.rs
@@ -1,5 +1,7 @@
 use std::fmt::Display;
 
+use bincode::Decode;
+use bincode::Encode;
 use serde::Deserialize;
 use serde::Serialize;
 
@@ -13,14 +15,20 @@ pub struct GetUserRatingApi {
     pub user_id: u32,
 }
 
-#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+impl From<u32> for GetUserRatingApi {
+    fn from(user_id: u32) -> Self {
+        Self { user_id }
+    }
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize, Encode, Decode)]
 #[serde(rename_all = "camelCase")]
 pub struct GetUserRatingApiResp {
     pub user_id: u32,
     pub user_rating: UserRating,
 }
 
-#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize, Encode, Decode)]
 #[serde(rename_all = "camelCase")]
 pub struct UserRating {
     /// total rating, now it's 0
@@ -36,7 +44,7 @@ pub struct UserRating {
     pub udemae: Udemae,
 }
 
-#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize, Encode, Decode)]
 #[serde(rename_all = "camelCase")]
 pub struct MusicRating {
     /// Maimai music id
@@ -54,7 +62,7 @@ pub struct MusicRating {
     pub achievement: i32,
 }
 
-#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize, Encode, Decode)]
 #[serde(rename_all = "camelCase")]
 pub struct Udemae {
     pub max_lose_num: i64,
diff --git a/sdgb-cli/src/main.rs b/sdgb-cli/src/main.rs
index 80143e5..ebf6be5 100644
--- a/sdgb-cli/src/main.rs
+++ b/sdgb-cli/src/main.rs
@@ -264,10 +264,22 @@ async fn main() -> Result<(), Box<dyn snafu::Error>> {
 
         #[cfg(feature = "fetchall")]
         Commands::ScrapeAllB50 { concurrency } => {
+            use sdgb_api::title::methods;
+
             use crate::{
-                cache::PLAYERS,
-                utils::helpers::{cached_concurrent_fetch, read_cache},
+                cache::{PLAYER_B50, PLAYERS},
+                utils::helpers::{cached_concurrent_fetch, read_cache_keys},
             };
+
+            let user_ids = read_cache_keys(PLAYERS)?;
+
+            cached_concurrent_fetch::<methods::GetUserRatingApi>(
+                user_ids,
+                &client,
+                concurrency,
+                PLAYER_B50,
+            )
+            .await?;
         }
 
         Commands::Userdata { user_id } => {
diff --git a/sdgb-cli/src/utils/helpers/mod.rs b/sdgb-cli/src/utils/helpers/mod.rs
index 138cd98..1485657 100644
--- a/sdgb-cli/src/utils/helpers/mod.rs
+++ b/sdgb-cli/src/utils/helpers/mod.rs
@@ -20,6 +20,19 @@ use bincode::{BorrowDecode, Encode, borrow_decode_from_slice};
 
 use crate::{EARLY_QUIT, cache};
 
+pub fn read_cache_keys(
+    definition: TableDefinition<'_, u32, Vec<u8>>,
+) -> Result<Vec<u32>, Box<dyn snafu::Error>> {
+    let txn = cache::read_txn()?;
+    let table = cache::open_table_ro(&txn, definition)?;
+
+    Ok(table
+        .iter()?
+        .flatten()
+        .map(|(value, _)| value.value())
+        .collect::<Vec<u32>>())
+}
+
 pub fn read_cache<D>(
     definition: TableDefinition<'_, u32, Vec<u8>>,
 ) -> Result<Vec<D>, Box<dyn snafu::Error>>
@@ -123,7 +136,7 @@ where
                 }
                 Err(sdgb_api::ApiError::JSON { .. }) => {}
                 Err(e) => {
-                    error!("preview failed: {e}");
+                    error!("fetch failed: {e}");
                 }
             }