Feat: Implement Audit Logging and integrate into Reservation actions

supabase_schema.sql

@@ -95,3 +95,28 @@ $$ language plpgsql security definer;
 create trigger on_auth_user_created
   after insert on auth.users
   for each row execute procedure public.handle_new_user();
+
+-- Create Audit Logs Table
+create table audit_logs (
+  id uuid default uuid_generate_v4() primary key,
+  user_id uuid references auth.users(id),
+  action text not null,
+  entity_type text not null,
+  entity_id uuid,
+  details jsonb,
+  created_at timestamp with time zone default timezone('utc'::text, now()) not null
+);
+
+-- RLS for Audit Logs
+alter table audit_logs enable row level security;
+
+create policy "Admins can read all logs" on audit_logs
+  for select using (
+    exists (
+      select 1 from profiles
+      where profiles.id = auth.uid() and profiles.role = 'admin'
+    )
+  );
+
+create policy "Users can insert logs" on audit_logs
+  for insert with check (auth.uid() = user_id);