diff --git a/src/hooks/use-auth.ts b/src/hooks/use-auth.ts
deleted file mode 100644
index 9afd271..0000000
--- a/src/hooks/use-auth.ts
+++ /dev/null
@@ -1,94 +0,0 @@
-import { useEffect, useState } from "react";
-import type { User } from "@supabase/supabase-js";
-import { supabase } from "@/integrations/supabase/client";
-
-// Mirrors the public.app_role enum. "student" has no enum member but is kept
-// because existing screens branch on it.
-export type Role =
-  | "super_admin"
-  | "org_admin"
-  | "admin"
-  | "campus_admin"
-  | "management"
-  | "billing_admin"
-  | "teacher"
-  | "staff"
-  | "parent"
-  | "auditor"
-  | "student";
-
-export interface AuthState {
-  user: User | null;
-  roles: Role[];
-  loading: boolean;
-}
-
-export function useAuth(): AuthState {
-  const [user, setUser] = useState<User | null>(null);
-  const [roles, setRoles] = useState<Role[]>([]);
-  const [loading, setLoading] = useState(true);
-
-  useEffect(() => {
-    let mounted = true;
-
-    const loadRoles = async (uid: string) => {
-      const { data } = await supabase.from("user_roles").select("role").eq("user_id", uid);
-      if (mounted) setRoles((data ?? []).map((r) => r.role as Role));
-    };
-
-    supabase.auth.getSession().then(({ data }) => {
-      if (!mounted) return;
-      setUser(data.session?.user ?? null);
-      if (data.session?.user)
-        loadRoles(data.session.user.id).finally(() => mounted && setLoading(false));
-      else setLoading(false);
-    });
-
-    const { data: sub } = supabase.auth.onAuthStateChange((_e, session) => {
-      setUser(session?.user ?? null);
-      if (session?.user) {
-        setTimeout(() => loadRoles(session.user.id), 0);
-      } else {
-        setRoles([]);
-      }
-    });
-
-    return () => {
-      mounted = false;
-      sub.subscription.unsubscribe();
-    };
-  }, []);
-
-  return { user, roles, loading };
-}
-
-const ROLE_SENIORITY: Role[] = [
-  "super_admin",
-  "org_admin",
-  "admin",
-  "campus_admin",
-  "management",
-  "billing_admin",
-  "teacher",
-  "staff",
-  "parent",
-  "auditor",
-  "student",
-];
-
-export function highestRole(roles: Role[]): Role | null {
-  return ROLE_SENIORITY.find((r) => roles.includes(r)) ?? null;
-}
-
-/**
- * Organization-wide administrative reach. Mirrors public.is_org_admin() —
- * keep the two in step, or the UI will offer actions that RLS then refuses.
- */
-export function isOrgAdmin(roles: Role[]): boolean {
-  return roles.some((r) => r === "admin" || r === "org_admin" || r === "super_admin");
-}
-
-/** Mirrors public.is_billing_admin(). */
-export function canBill(roles: Role[]): boolean {
-  return isOrgAdmin(roles) || roles.includes("billing_admin");
-}