Slim down batch size to fit in ingestion

src/ingestion/db.rs

@@ -28,7 +28,7 @@ pub async fn insert(
         .map(|row| MonzoRow::into_insertion(row, account_id))
         .collect::<Result<Vec<_>, _>>()?;
 
-    for insertions in insertions.chunks(400) {
+    for insertions in insertions.chunks(200) {
         let (new_or_updated_insertions, inserted_transaction_ids) =
             whittle_insertions(insertions, db).await?;