Prevent race conditions

- This is a massive cope, I don't know how to code

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

src/utils/cleanup.rs

@@ -0,0 +1,14 @@
+use crate::database;
+use clickhouse::Client;
+
+pub async fn cleanup(clickhouse_client: &Client) {
+    let assets = database::assets::select(clickhouse_client).await;
+
+    let symbols = assets
+        .iter()
+        .map(|asset| asset.symbol.clone())
+        .collect::<Vec<_>>();
+
+    database::bars::delete_where_not_symbols(clickhouse_client, &symbols).await;
+    database::backfills::delete_where_not_symbols(clickhouse_client, &symbols).await;
+}