fix(backend): reject malformed timestamp (#12554)

packages/backend/src/misc/id/meid.ts

@@ -38,3 +38,7 @@ export function parseMeid(id: string): { date: Date; } {
 		date: new Date(parseInt(id.slice(0, 12), 16) - 0x800000000000),
 	};
 }
+
+export function isSafeMeidT(t: number): boolean {
+	return t > 0;
+}