Rollen Chunk 4: Benutzerkonto, Abmelde-Icon und fremde Einstellungen

src/lib/repository.ts

@@ -69,6 +69,13 @@ export function countUsers(db: Db): number {
   return row.count;
 }
 
+export function userExists(db: Db, userId: string): boolean {
+  const row = db
+    .prepare("SELECT id FROM \"user\" WHERE id = ?")
+    .get(userId) as { id: string } | undefined;
+  return row !== undefined;
+}
+
 export type UserRole = "admin" | "teamleiter" | "benutzer";
 
 export function getUserRole(db: Db, userId: string): UserRole {