fix: resolve RLS infinite recursion in tastings and sessions

src/app/page.tsx

@@ -89,9 +89,9 @@ export default function Home() {
             });
 
             setBottles(processedBottles);
-        } catch (err) {
+        } catch (err: any) {
             console.error('Detailed fetch error:', err);
-            setFetchError('Die Sammlung konnte nicht geladen werden. Bitte versuche es später erneut.');
+            setFetchError(err.message || JSON.stringify(err));
         } finally {
             setIsLoading(false);
         }
@@ -153,12 +153,12 @@ export default function Home() {
                             <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-amber-600"></div>
                         </div>
                     ) : fetchError ? (
-                        <div className="p-8 bg-red-50 dark:bg-red-900/10 border border-red-200 dark:border-red-900/30 rounded-3xl text-center">
-                            <p className="text-red-600 dark:text-red-400 font-bold mb-2">Hoppla!</p>
-                            <p className="text-red-500/80 text-sm italic">{fetchError}</p>
+                        <div className="p-8 bg-zinc-100 dark:bg-zinc-900/50 border border-zinc-200 dark:border-zinc-800 rounded-3xl text-center">
+                            <p className="text-zinc-800 dark:text-zinc-200 font-bold mb-2">Sammlung konnte nicht geladen werden</p>
+                            <p className="text-zinc-500 text-sm italic mb-4">Möglicherweise müssen die Datenbank-Regeln aktualisiert werden.</p>
                             <button
                                 onClick={fetchCollection}
-                                className="mt-4 px-6 py-2 bg-zinc-900 dark:bg-zinc-100 text-white dark:text-zinc-900 rounded-xl text-xs font-bold uppercase tracking-widest"
+                                className="px-6 py-2 bg-amber-600 hover:bg-amber-700 text-white rounded-xl text-xs font-bold uppercase tracking-widest transition-all"
                             >
                                 Erneut versuchen
                             </button>

src/app/sessions/[id]/page.tsx

@@ -99,9 +99,16 @@ export default function SessionDetailPage() {
     const handleAddParticipant = async (buddyId: string) => {
         if (participants.some(p => p.buddy_id === buddyId)) return;
 
+        const { data: { user } } = await supabase.auth.getUser();
+        if (!user) return;
+
         const { error } = await supabase
             .from('session_participants')
-            .insert([{ session_id: id, buddy_id: buddyId }]);
+            .insert([{
+                session_id: id,
+                buddy_id: buddyId,
+                user_id: user.id
+            }]);
 
         if (!error) {
             fetchSessionData();

src/services/save-tasting.ts

@@ -41,7 +41,8 @@ export async function saveTasting(data: {
         if (data.buddy_ids && data.buddy_ids.length > 0) {
             const tags = data.buddy_ids.map(buddyId => ({
                 tasting_id: tasting.id,
-                buddy_id: buddyId
+                buddy_id: buddyId,
+                user_id: session.user.id
             }));
             const { error: tagError } = await supabase
                 .from('tasting_tags')

supa_schema.sql

@@ -64,10 +64,11 @@ CREATE TABLE IF NOT EXISTS tasting_sessions (
   created_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('Europe/Berlin'::text, now())
 );
 
--- Session Participants junction
+-- Session Participants junction (updated with user_id to avoid RLS recursion)
 CREATE TABLE IF NOT EXISTS session_participants (
   session_id UUID REFERENCES tasting_sessions(id) ON DELETE CASCADE NOT NULL,
   buddy_id UUID REFERENCES buddies(id) ON DELETE CASCADE NOT NULL,
+  user_id UUID REFERENCES profiles(id) ON DELETE CASCADE NOT NULL, -- The owner of the session
   PRIMARY KEY (session_id, buddy_id)
 );
 
@@ -85,10 +86,11 @@ CREATE TABLE IF NOT EXISTS tastings (
   created_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('Europe/Berlin'::text, now())
 );
 
--- Tasting Tagging (to tag buddies in a tasting)
+-- Tasting Tagging (updated with user_id to avoid RLS recursion)
 CREATE TABLE IF NOT EXISTS tasting_tags (
   tasting_id UUID REFERENCES tastings(id) ON DELETE CASCADE NOT NULL,
   buddy_id UUID REFERENCES buddies(id) ON DELETE CASCADE NOT NULL,
+  user_id UUID REFERENCES profiles(id) ON DELETE CASCADE NOT NULL, -- The owner of the tasting
   PRIMARY KEY (tasting_id, buddy_id)
 );
 
@@ -160,10 +162,8 @@ CREATE POLICY "Users can see sessions they participate in" ON tasting_sessions
 
 -- Policies for Session Participants
 ALTER TABLE session_participants ENABLE ROW LEVEL SECURITY;
-CREATE POLICY "Users can manage participants of their sessions" ON session_participants
-  FOR ALL USING (
-    session_id IN (SELECT id FROM tasting_sessions WHERE user_id = auth.uid())
-  );
+CREATE POLICY "Users can manage their own session participants" ON session_participants
+  FOR ALL USING (auth.uid() = user_id);
 CREATE POLICY "Participants can see session membership" ON session_participants
   FOR SELECT USING (
     buddy_id IN (SELECT id FROM buddies WHERE buddy_profile_id = auth.uid())
@@ -171,10 +171,8 @@ CREATE POLICY "Participants can see session membership" ON session_participants
 
 -- Policies for Tasting Tags
 ALTER TABLE tasting_tags ENABLE ROW LEVEL SECURITY;
-CREATE POLICY "Users can manage tags on their tastings" ON tasting_tags
-  FOR ALL USING (
-    tasting_id IN (SELECT id FROM tastings WHERE user_id = auth.uid())
-  );
+CREATE POLICY "Users can manage their own tasting tags" ON tasting_tags
+  FOR ALL USING (auth.uid() = user_id);
 CREATE POLICY "Tagged users can see the tags" ON tasting_tags
   FOR SELECT USING (
     buddy_id IN (SELECT id FROM buddies WHERE buddy_profile_id = auth.uid())