fix: 🐛 first user gets admin

Closes #9620

Co-authored-by: @Johann150

packages/backend/src/server/api/common/signup.ts

@@ -107,6 +107,7 @@ export async function signup(opts: {
 				isAdmin:
 					(await Users.countBy({
 						host: IsNull(),
+						isAdmin: true,
 					})) === 0,
 			}),
 		);

packages/backend/src/server/api/endpoints/admin/accounts/create.ts

@@ -35,6 +35,7 @@ export default define(meta, paramDef, async (ps, _me) => {
 	const noUsers =
 		(await Users.countBy({
 			host: IsNull(),
+			isAdmin: true,
 		})) === 0;
 	if (!(noUsers || me?.isAdmin)) throw new Error("access denied");
 

packages/backend/src/server/api/endpoints/meta.ts

@@ -489,6 +489,7 @@ export default define(meta, paramDef, async (ps, me) => {
 					requireSetup:
 						(await Users.countBy({
 							host: IsNull(),
+							isAdmin: true,
 						})) === 0,
 			  }
 			: {}),