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

backend/database.py

@@ -26,6 +26,9 @@ def get_connection() -> sqlite3.Connection:
     conn.execute("PRAGMA journal_mode=WAL")
     conn.execute("PRAGMA foreign_keys=ON")
     conn.execute("PRAGMA busy_timeout=5000")
+    conn.execute("PRAGMA cache_size = -32000")   # 32MB Page-Cache
+    conn.execute("PRAGMA temp_store = MEMORY")   # Temp-Tabellen im RAM statt auf Disk
+    conn.execute("PRAGMA mmap_size = 268435456") # 256MB Memory-Mapped I/O
     conn.create_function('norm', 1, _norm)
     return conn
 
@@ -1212,3 +1215,11 @@ def _migrate(conn_factory):
             )
         """)
         logger.info("Migration: dogs.gewicht_kg aus health synchronisiert.")
+
+        # Performance-Indizes für häufige Queries
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_health_naechstes ON health(naechstes) WHERE naechstes IS NOT NULL")
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_ki_calls_user_date ON ki_daily_calls(user_id, date)")
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_events_user_datum ON events(user_id, datum)")
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_diary_created ON diary(dog_id, created_at DESC)")
+        conn.execute("CREATE INDEX IF NOT EXISTS idx_notes_created ON notes(user_id, created_at DESC)")
+        logger.info("Migration: Performance-Indizes bereit.")