skip wirting index is it already exists

src/data_store/mod.rs

@@ -3,6 +3,7 @@
 use anyhow::Result;
 use camino::Utf8PathBuf;
 use parquet::arrow::AsyncArrowWriter;
+use tracing::debug;
 
 use crate::{directories::data_cache_directory, malie::models::Index};
 
@@ -18,6 +19,11 @@ impl Store {
     }
 
     pub async fn write_index(&self, index: Index) -> Result<()> {
+        let path = self.data_cache_directory.join("ptcgl_index.parquet");
+        if let Ok(true) = tokio::fs::try_exists(&path).await {
+            debug!("File {path} already exists, skipping.");
+            return Ok(());
+        }
         // let mut writer = AsyncArrowWriter::try_new(writer, arrow_schema, props)
         Ok(())
     }