Add DEV_MODE with comprehensive logging for error diagnosis

- DEV_MODE flag in config.py (env var, default true for dev server)
- Log rotation: 5 MB max, 5 backups (RotatingFileHandler)
- DEBUG level in dev mode, INFO in production
- HTTP request logging middleware (dev mode only, skips static files)
- External library log levels suppressed (httpx, httpcore, uvicorn)
- Customer version: set DEV_MODE=false to disable verbose logging

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/config.py

@@ -28,6 +28,10 @@ CLAUDE_MODEL_FAST = "claude-haiku-4-5-20251001"  # Für einfache Aufgaben (Feed-
 # Ausgabesprache (Lagebilder, Faktenchecks, Zusammenfassungen)
 OUTPUT_LANGUAGE = "Deutsch"
 
+# Dev-Modus: ausfuehrliches Logging (DEBUG-Level, HTTP-Request-Log)
+# In Kundenversion auf False setzen oder Env-Variable entfernen
+DEV_MODE = os.environ.get("DEV_MODE", "true").lower() == "true"
+
 # RSS-Feeds (Fallback, primär aus DB geladen)
 RSS_FEEDS = {
     "deutsch": [

src/main.py

@@ -15,7 +15,7 @@ from fastapi.responses import FileResponse, RedirectResponse
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
 from starlette.middleware.base import BaseHTTPMiddleware
 
-from config import STATIC_DIR, LOG_DIR, DATA_DIR, TIMEZONE
+from config import STATIC_DIR, LOG_DIR, DATA_DIR, TIMEZONE, DEV_MODE
 from database import init_db, get_db
 from auth import decode_token
 from agents.orchestrator import orchestrator
@@ -25,15 +25,33 @@ from services.fact_consolidation import consolidate_fact_checks
 
 # Logging
 os.makedirs(LOG_DIR, exist_ok=True)
-logging.basicConfig(
-    level=logging.INFO,
-    format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
-    handlers=[
-        logging.StreamHandler(sys.stdout),
-        logging.FileHandler(os.path.join(LOG_DIR, "osint-monitor.log")),
-    ],
+from logging.handlers import RotatingFileHandler
+import time as _time
+
+_log_level = logging.DEBUG if DEV_MODE else logging.INFO
+_file_handler = RotatingFileHandler(
+    os.path.join(LOG_DIR, "osint-monitor.log"),
+    maxBytes=5 * 1024 * 1024,  # 5 MB
+    backupCount=5,
+    encoding="utf-8",
 )
+_file_handler.setLevel(_log_level)
+_console_handler = logging.StreamHandler(sys.stdout)
+_console_handler.setLevel(_log_level)
+
+logging.basicConfig(
+    level=_log_level,
+    format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
+    handlers=[_console_handler, _file_handler],
+)
+# Externe Bibliotheken nicht auf DEBUG setzen
+logging.getLogger("httpx").setLevel(logging.WARNING)
+logging.getLogger("httpcore").setLevel(logging.WARNING)
+logging.getLogger("uvicorn.access").setLevel(logging.WARNING)
+logging.getLogger("apscheduler").setLevel(logging.INFO)
+
 logger = logging.getLogger("osint")
+logger.info(f"Monitor gestartet (DEV_MODE={DEV_MODE}, Log-Level={logging.getLevelName(_log_level)})")
 
 
 class WebSocketManager:
@@ -255,6 +273,24 @@ app = FastAPI(
 )
 
 
+# Request-Logging Middleware (nur im Dev-Modus)
+if DEV_MODE:
+    _req_logger = logging.getLogger("osint.http")
+
+    class RequestLoggingMiddleware(BaseHTTPMiddleware):
+        async def dispatch(self, request: Request, call_next):
+            start = _time.monotonic()
+            response = await call_next(request)
+            duration = (_time.monotonic() - start) * 1000
+            # Statische Dateien und WebSocket-Upgrades nicht loggen
+            path = request.url.path
+            if not path.startswith(("/static/", "/favicon")) and "websocket" not in str(request.headers.get("upgrade", "")):
+                _req_logger.debug(
+                    f"{request.method} {path} -> {response.status_code} ({duration:.0f}ms)"
+                )
+            return response
+
+
 # Security-Headers Middleware
 class SecurityHeadersMiddleware(BaseHTTPMiddleware):
     async def dispatch(self, request: Request, call_next):
@@ -275,6 +311,8 @@ class SecurityHeadersMiddleware(BaseHTTPMiddleware):
 
 
 app.add_middleware(SecurityHeadersMiddleware)
+if DEV_MODE:
+    app.add_middleware(RequestLoggingMiddleware)
 
 # CORS
 app.add_middleware(