add concurrent thread config

assets-updater/src/core/config.rs

@@ -63,10 +63,6 @@ pub struct ExecutionConfig {
     pub proxy: Option<String>,
     pub timeout_seconds: u64,
     pub allow_cancel: bool,
-    /// How many successful downloads to accumulate before flushing the download
-    /// record to disk mid-run.  Set to `0` to disable mid-run flushing (record
-    /// is only written once at the end).  Mirrors Go's `batchSaveSize`.
-    pub batch_save_size: usize,
     pub retry: RetryConfig,
 }
 
@@ -76,7 +72,6 @@ impl Default for ExecutionConfig {
             proxy: None,
             timeout_seconds: 300,
             allow_cancel: true,
-            batch_save_size: 50,
             retry: RetryConfig::default(),
         }
     }