[codex] Surface merchant application submit failures

backend/db/app_location.go

@@ -583,7 +583,7 @@ func (a *AppDB) AddLocation(ctx context.Context, location *structs.Location) err
 				$19, $20, $21, $22, $23, $24, $25, $26,
 				$27, $28, $29, $30, $31, $32
 			)
-			ON CONFLICT (google_id) WHERE active = TRUE
+			ON CONFLICT (google_id) WHERE active = TRUE AND google_id IS NOT NULL
 			DO UPDATE SET
 				owner_id = EXCLUDED.owner_id,
 				name = EXCLUDED.name,

backend/handlers/app_location.go

@@ -145,8 +145,8 @@ func (a *AppService) AddLocation(w http.ResponseWriter, r *http.Request) {
 	location.OwnerID = *userDid
 	err = a.db.AddLocation(r.Context(), location)
 	if err != nil {
-		w.WriteHeader(http.StatusBadRequest)
 		a.logger.Logf("invalid location body: %s", err.Error())
+		http.Error(w, "Unable to submit merchant application.", http.StatusBadRequest)
 		return
 	}
 

frontend/components/merchant/merchant-approval-form.tsx

@@ -190,15 +190,22 @@ export function MerchantApprovalForm() {
       service_stations: Number(serviceStations),
       tablet_model: tabletModel  === "Other" ? tabletModelOther : tabletModel,
       messaging_service: messagingService === "Other" ? messagingServiceOther : messagingService,
+      payment_wallets: [],
       reference: reference,
     }
 
     setIsSubmitting(true)
-    await addLocation(newLocation)
-    setSearchKey(prev => prev + 1)
-    setIsSubmitting(false);
-    resetForm()
-    router.replace("/map")
+    setError(null)
+    try {
+      await addLocation(newLocation)
+      setSearchKey(prev => prev + 1)
+      resetForm()
+      router.replace("/map")
+    } catch (error) {
+      setError(error instanceof Error ? error.message : "Unable to submit merchant application.")
+    } finally {
+      setIsSubmitting(false)
+    }
   }
 
   return (

frontend/context/LocationProvider.tsx

@@ -132,14 +132,16 @@ export default function LocationProvider({ children }: { children: ReactNode })
                 body: JSON.stringify(location)
             })
             if(res.status != 201) {
-                throw new Error("error adding new location, from controller")
+                const message = (await res.text()).trim()
+                throw new Error(message || "Unable to submit merchant application.")
             }
             setUserLocationsRef.current((currentLocations) => [...currentLocations, location])
             setMapLocationsStatus("available")
         }
-        catch {
+        catch (error) {
             setMapLocationsStatus("unavailable")
-            console.error("error adding new location")
+            console.error("error adding new location", error)
+            throw error
         }
       }, [])