Performance: GZip, Cache-Control, WebP, SQLite-Tuning, Indizes, srcset — SW by-v438, APP_VER 417

backend/main.py

@@ -10,6 +10,7 @@ from fastapi import FastAPI, Request
 from fastapi.staticfiles import StaticFiles
 from fastapi.responses import FileResponse, JSONResponse
 from starlette.middleware.base import BaseHTTPMiddleware
+from fastapi.middleware.gzip import GZipMiddleware
 from contextlib import asynccontextmanager
 
 from database import init_db
@@ -98,6 +99,20 @@ class _CacheControlMiddleware(BaseHTTPMiddleware):
 app.add_middleware(_CacheControlMiddleware)
 
 
+class MediaCacheMiddleware(BaseHTTPMiddleware):
+    """Setzt aggressive Cache-Header für /media/-Requests.
+    UUID-basierte Dateinamen ändern sich nie → immutable caching.
+    """
+    async def dispatch(self, request: Request, call_next):
+        response = await call_next(request)
+        if request.url.path.startswith('/media/'):
+            response.headers['Cache-Control'] = 'public, max-age=31536000, immutable'
+        return response
+
+app.add_middleware(MediaCacheMiddleware)
+app.add_middleware(GZipMiddleware, minimum_size=1000)
+
+
 # ------------------------------------------------------------------
 # API-Router registrieren (werden nach und nach hinzugefügt)
 # ------------------------------------------------------------------