Refactor: Code-Qualität verbessert und Projektstruktur aufgeräumt

- daemon.py: gc.collect() entfernt, robustes Scheduling (last_run_date statt Minuten-Check),
  Exchange Registry Pattern eingeführt (STREAMING_EXCHANGES/STANDARD_EXCHANGES)
- deutsche_boerse.py: Thread-safe User-Agent Rotation bei Rate-Limits,
  Logging statt print(), Feiertags-Prüfung, aufgeteilte Parse-Methoden
- eix.py: Logging statt print(), spezifische Exception-Typen statt blankem except
- read.py gelöscht und durch scripts/inspect_gzip.py ersetzt (Streaming-basiert)
- Utility-Scripts in scripts/ verschoben (cleanup_duplicates, restore_and_fix, verify_fix)

scripts/test_sector_fetch.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+"""Test script to verify the improved sector metadata fetching"""
+
+import sys
+sys.path.insert(0, '/Users/melchiorreimers/.gemini/antigravity/scratch/trading_daemon/src')
+
+from metadata.fetcher import fetch_ticker_from_openfigi, fetch_sector_from_yfinance, fetch_metadata
+
+# Test ISINs from different regions and sectors
+test_isins = [
+    'US69553P1003',  # PagerDuty (US, Technology)
+    'DE000LS1LUS9',  # German security
+    'US0378331005',  # Apple (US, Technology)
+]
+
+print("Testing improved sector metadata fetching...\n")
+
+for isin in test_isins:
+    print(f"Testing ISIN: {isin}")
+    
+    # Test ticker lookup
+    ticker = fetch_ticker_from_openfigi(isin)
+    print(f"  Ticker: {ticker}")
+    
+    # Test sector lookup if ticker found
+    if ticker:
+        sector = fetch_sector_from_yfinance(ticker)
+        print(f"  Sector: {sector}")
+    
+    print()
+
+print("\nFull metadata test for US69553P1003:")
+metadata = fetch_metadata('US69553P1003')
+for key, value in metadata.items():
+    print(f"  {key}: {value}")