refactors to use redis & celery

app/filters.py

@@ -4,4 +4,12 @@ from datetime import datetime
 def register_filters(app):
     @app.template_filter('datetimeformat')
     def datetimeformat(value):
-        return datetime.fromtimestamp(value).strftime('%Y-%m-%d %H:%M:%S')
+        """Convert datetime or timestamp to formatted string"""
+        if isinstance(value, datetime):
+            dt = value
+        else:
+            try:
+                dt = datetime.fromtimestamp(float(value))
+            except (ValueError, TypeError):
+                return str(value)
+        return dt.strftime('%Y-%m-%d %H:%M:%S')