Update

frontend/src/api.ts

@@ -140,6 +140,10 @@ async function request<T>(url: string, options: ApiRequestInit = {}): Promise<T>
       throw new ApiError("Anfrage hat zu lange gedauert", 408);
     }
 
+    if (error instanceof TypeError) {
+      throw new ApiError("Verbindung zum Server wurde unterbrochen. Bitte prüfen, ob Backend und Frontend laufen und ob das Backup kleiner als das Upload-Limit ist.", 503);
+    }
+
     throw error;
   } finally {
     if (timeout) {
@@ -223,14 +227,18 @@ export function createSetupAdmin(payload: { username: string; displayName: strin
 export function restoreSetupBackup(sql: string) {
   return request<{ ok: boolean }>("/api/setup/restore", {
     method: "POST",
-    body: JSON.stringify({ sql })
+    timeoutMs: 10 * 60 * 1000,
+    headers: { "Content-Type": "text/plain; charset=utf-8" },
+    body: sql
   });
 }
 
 export function validateSetupBackup(sql: string) {
   return request<RestoreValidationResult>("/api/setup/restore/validate", {
     method: "POST",
-    body: JSON.stringify({ sql })
+    timeoutMs: 10 * 60 * 1000,
+    headers: { "Content-Type": "text/plain; charset=utf-8" },
+    body: sql
   });
 }
 
@@ -287,14 +295,18 @@ export async function downloadDatabaseExport() {
 export function restoreDatabaseBackup(sql: string) {
   return request<{ ok: boolean }>("/api/admin/restore/database", {
     method: "POST",
-    body: JSON.stringify({ sql })
+    timeoutMs: 10 * 60 * 1000,
+    headers: { "Content-Type": "text/plain; charset=utf-8" },
+    body: sql
   });
 }
 
 export function validateDatabaseBackup(sql: string) {
   return request<RestoreValidationResult>("/api/admin/restore/database/validate", {
     method: "POST",
-    body: JSON.stringify({ sql })
+    timeoutMs: 10 * 60 * 1000,
+    headers: { "Content-Type": "text/plain; charset=utf-8" },
+    body: sql
   });
 }