fix: remove delegation from local storage only when error status is 404

src/utils/local_storage/filterDelegationsLocalStorage.ts

@@ -1,6 +1,6 @@
 import { Delegation } from "@/app/types/delegations";
 
-import { getTxInfo } from "../mempool_api";
+import { getTxInfo, ServerError } from "../mempool_api";
 
 // Duration after which a delegation should be removed from the local storage
 // if not identified by the API or mempool.
@@ -44,10 +44,12 @@ export const filterDelegationsLocalStorage = async (
       try {
         const fetchedTx = await getTxInfo(localDelegation.stakingTxHashHex);
         if (!fetchedTx) {
-          throw new Error("Transaction not found in the mempool");
+          throw new ServerError("Transaction not found in the mempool", 404);
+        }
+      } catch (err) {
+        if ((err as ServerError).code === 404) {
+          isInMempool = false;
         }
-      } catch (_error) {
-        isInMempool = false;
       }
 
       if (!isInMempool) {

src/utils/mempool_api.ts

@@ -4,6 +4,15 @@ import { Fees, UTXO } from "./wallet/wallet_provider";
 
 const { mempoolApiUrl } = getNetworkConfig();
 
+export class ServerError extends Error {
+  constructor(
+    message: string,
+    public code: number,
+  ) {
+    super(message);
+  }
+}
+
 /*
     URL Construction methods
 */
@@ -199,7 +208,7 @@ export async function getTxInfo(txId: string): Promise<any> {
   const response = await fetch(txInfoUrl(txId));
   if (!response.ok) {
     const err = await response.text();
-    throw new Error(err);
+    throw new ServerError(err, response.status);
   }
   return await response.json();
 }