redis fix

app.py

@@ -6,6 +6,8 @@ import requests.auth
 import os
 import base64
 from typing import Dict, Any, Tuple, Union
+import sys
+import redis
 
 from lib.datetime import filter_accounts_next_30_days, filter_accounts_expired
 from lib.reqs import (get_urls, get_user_accounts, add_user_account,
@@ -30,10 +32,22 @@ if os.environ.get("FLASK_ENV") == "production":
 else:
     app.config.from_object(DevelopmentConfig)
 
-cache = Cache(app, config={
-    "CACHE_TYPE": "redis",
-    "CACHE_REDIS_URL": app.config.get("REDIS_URL", "redis://localhost:6379/0")
-})
+# Check for Redis availability and configure cache
+redis_url = app.config.get("REDIS_URL", "redis://localhost:6379/0")
+cache_config = {"CACHE_TYPE": "redis", "CACHE_REDIS_URL": redis_url}
+try:
+    # Use a short timeout to prevent hanging
+    r = redis.from_url(redis_url, socket_connect_timeout=1)
+    r.ping()
+except redis.exceptions.ConnectionError as e:
+    print(
+        f"WARNING: Redis connection failed: {e}. Falling back to SimpleCache. "
+        "This is not recommended for production with multiple workers.",
+        file=sys.stderr,
+    )
+    cache_config = {"CACHE_TYPE": "SimpleCache"}
+
+cache = Cache(app, config=cache_config)
 
 if app.config.get("OCR_ENABLED") and OCR_AVAILABLE:
     ocr = PaddleOCR(use_angle_cls=True, lang='en')
@@ -44,7 +58,6 @@ app.config["SESSION_COOKIE_SECURE"] = not app.config["DEBUG"]
 app.config['SESSION_COOKIE_HTTPONLY'] = True
 app.config['SESSION_COOKIE_SAMESITE'] = 'Lax'
 app.config['PERMANENT_SESSION_LIFETIME'] = 60 * 60 * 24 * 365  # 1 year
-cache.clear()
 
 def get_version() -> str:
     """Retrieves the application version from the VERSION file.