chore: security hardening, mobile PWA fix & analysis expansion

- Applied strict RLS and auth validation to tracking/credit services
- Set Service Worker to Network First to fix mobile session/loading issues
- Expanded Gemini analysis summary to show distilled/bottled/batch info
- Updated SQL schema document with hardening policies

public/sw.js

@@ -30,9 +30,14 @@ self.addEventListener('activate', (event) => {
 });
 
 self.addEventListener('fetch', (event) => {
+    // Network first, fallback to cache
     event.respondWith(
-        caches.match(event.request).then((response) => {
-            return response || fetch(event.request);
+        fetch(event.request)
+            .then((response) => {
+                return response;
+            })
+            .catch(() => {
+                return caches.match(event.request);
             })
     );
 });

src/middleware.ts

@@ -4,12 +4,20 @@ import type { NextRequest } from 'next/server';
 
 export async function middleware(req: NextRequest) {
     const res = NextResponse.next();
+    const url = new URL(req.url);
+
+    // Skip logs for static assets
+    const isStatic = url.pathname.startsWith('/_next') || url.pathname.includes('/icon-') || url.pathname === '/favicon.ico';
 
     // Only attempt session refresh if variables are present
     if (process.env.NEXT_PUBLIC_SUPABASE_URL && process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY) {
         try {
             const supabase = createMiddlewareClient({ req, res });
-            await supabase.auth.getSession();
+            const { data: { session } } = await supabase.auth.getSession();
+
+            if (!isStatic) {
+                console.log(`[Middleware] Path: ${url.pathname}, Session: ${session ? 'Active' : 'Missing'}, User: ${session?.user?.id || 'N/A'}`);
+            }
         } catch (e) {
             console.error('Middleware session refresh failed:', e);
         }

src/services/credit-service.ts

@@ -3,6 +3,8 @@
 import { createServerComponentClient } from '@supabase/auth-helpers-nextjs';
 import { cookies } from 'next/headers';
 
+import { checkIsAdmin } from './track-api-usage';
+
 interface UserCredits {
     user_id: string;
     balance: number;
@@ -34,6 +36,17 @@ export async function getUserCredits(userId: string): Promise<UserCredits | null
     try {
         const supabase = createServerComponentClient({ cookies });
 
+        // Security check: Only self or admin can view credits
+        const { data: { user: currentUser } } = await supabase.auth.getUser();
+        if (!currentUser) return null;
+
+        const isAdmin = await checkIsAdmin(currentUser.id);
+
+        if (currentUser.id !== userId && !isAdmin) {
+            console.error('Unauthorized credit fetch attempt');
+            return null;
+        }
+
         const { data, error } = await supabase
             .from('user_credits')
             .select('*')
@@ -132,6 +145,16 @@ export async function deductCredits(
             return { success: false, error: 'Could not fetch credit information' };
         }
 
+        // Security check: Only self or admin can deduct credits
+        const { data: { user: currentUser } } = await supabase.auth.getUser();
+        if (!currentUser) return { success: false, error: 'Nicht authentifiziert' };
+
+        const isAdmin = await checkIsAdmin(currentUser.id);
+
+        if (currentUser.id !== userId && !isAdmin) {
+            return { success: false, error: 'Nicht autorisiert' };
+        }
+
         const cost = apiType === 'google_search'
             ? credits.google_search_cost
             : credits.gemini_ai_cost;
@@ -140,7 +163,7 @@ export async function deductCredits(
         if (credits.balance < cost) {
             return {
                 success: false,
-                error: `Insufficient credits. Need ${cost}, have ${credits.balance}`
+                error: `Nicht genügend Credits. Du benötigst ${cost}, hast aber nur ${credits.balance}.`
             };
         }
 
@@ -197,6 +220,16 @@ export async function addCredits(
     try {
         const supabase = createServerComponentClient({ cookies });
 
+        // Security check
+        const { data: { user: currentUser } } = await supabase.auth.getUser();
+        if (!currentUser) return { success: false, error: 'Nicht authentifiziert' };
+
+        const isAdmin = await checkIsAdmin(currentUser.id);
+
+        if (!isAdmin && adminId) {
+            return { success: false, error: 'Nur Administratoren können Credits anpassen.' };
+        }
+
         // Get current credits
         const credits = await getUserCredits(userId);
         if (!credits) {

src/services/track-api-usage.ts

@@ -35,6 +35,13 @@ export async function trackApiUsage(params: TrackApiUsageParams): Promise<{ succ
     try {
         const supabase = createServerComponentClient({ cookies });
 
+        // Security check: Ensure user is only tracking their own usage
+        const { data: { user } } = await supabase.auth.getUser();
+        if (!user || user.id !== params.userId) {
+            console.error('Unauthorized API tracking attempt');
+            return { success: false, error: 'Nicht autorisiert' };
+        }
+
         const { error } = await supabase
             .from('api_usage')
             .insert({

supa_schema.sql

@@ -108,9 +108,19 @@ ALTER TABLE tastings ENABLE ROW LEVEL SECURITY;
 CREATE POLICY "Users can view their own profile" ON profiles
   FOR SELECT USING (auth.uid() = id);
 
+CREATE POLICY "Admins can view all profiles" ON profiles
+  FOR SELECT USING (
+    EXISTS (SELECT 1 FROM admin_users WHERE user_id = auth.uid())
+  );
+
 CREATE POLICY "Users can update their own profile" ON profiles
   FOR UPDATE USING (auth.uid() = id);
 
+CREATE POLICY "Admins can update all profiles" ON profiles
+  FOR UPDATE USING (
+    EXISTS (SELECT 1 FROM admin_users WHERE user_id = auth.uid())
+  );
+
 -- Policies for Bottles
 CREATE POLICY "Users can view their own bottles" ON bottles
   FOR SELECT USING (auth.uid() = user_id);
@@ -275,7 +285,7 @@ CREATE POLICY "Users can view their own API usage" ON api_usage FOR SELECT USING
 CREATE POLICY "Admins can view all API usage" ON api_usage FOR SELECT USING (
   EXISTS (SELECT 1 FROM admin_users WHERE user_id = auth.uid())
 );
-CREATE POLICY "System can insert API usage" ON api_usage FOR INSERT WITH CHECK (true);
+CREATE POLICY "Users can insert their own API usage" ON api_usage FOR INSERT WITH CHECK (auth.uid() = user_id);
 
 -- Policies for user_credits
 CREATE POLICY "Users can view their own credits" ON user_credits FOR SELECT USING (auth.uid() = user_id);
@@ -328,11 +338,11 @@ FOR SELECT USING (auth.uid() = user_id);
 
 CREATE POLICY "Admins can view all transactions" ON credit_transactions 
 FOR SELECT USING (
-  auth.uid() IN (SELECT user_id FROM admin_users)
+  EXISTS (SELECT 1 FROM admin_users WHERE user_id = auth.uid())
 );
 
-CREATE POLICY "System can insert transactions" ON credit_transactions 
-FOR INSERT WITH CHECK (true);
+CREATE POLICY "Users can insert their own transactions" ON credit_transactions 
+FOR INSERT WITH CHECK (auth.uid() = user_id);
 
 -- Update user_credits policies to allow admin updates
 CREATE POLICY "Admins can update credits" ON user_credits