Fix transaction blocking bug

We used to insert transactions by their source field. Then we started
using by (actually unique). This bug caused only one bank transaction to
exist at any time

1 files changed, 1 insertions, 1 deletions

diff --git a/src/handlers.rs b/src/handlers.rs
index df6e033..30a35e7 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -659,7 +659,7 @@ pub async fn propose_transaction(
 
     let mut transactions = db.pending_transactions.write();
 
-    transactions.insert(new_transaction.source.to_owned(), new_transaction);
+    transactions.insert(new_transaction.by.to_owned(), new_transaction);
 
     Ok(warp::reply::with_status(
         warp::reply::json(&GradeCoinResponse {