Enhance Ticket management functionalities

app/services/notification_service.py

@@ -77,15 +77,26 @@ def create_notification(user_id, notif_type, title, message, ticket_id=None, lin
         db.session.commit()
         logger.info(f'[NOTIFICATION CREATE] user_id={user_id} type={notif_type} ticket_id={ticket_id}')
 
-        # Real-time push
-        socketio.emit('new_notification', {
-            'id'      : notif.id,
-            'type'    : notif_type,
-            'title'   : title,
-            'message' : message,
-            'link'    : link,
+        # Real-time push — schedule via socketio.start_background_task so the
+        # emit runs inside eventlet's green-thread pool, not inline in the WSGI
+        # request context. Inline emits during a polling→WebSocket upgrade can
+        # race with the upgrade handshake and disconnect the client.
+        payload = {
+            'id'        : notif.id,
+            'type'      : notif_type,
+            'title'     : title,
+            'message'   : message,
+            'link'      : link,
             'created_at': notif.created_at.isoformat(),
-        }, room=f'user_{user_id}')
+        }
+        def _emit():
+            socketio.emit(
+                'new_notification',
+                payload,
+                to=f'user_{user_id}',   # 'to' is the modern alias for 'room'
+                namespace='/',          # explicit default namespace — avoids
+            )                            # ambiguity under reverse-proxy setups
+        socketio.start_background_task(_emit)
 
     except Exception as exc:
         db.session.rollback()
@@ -95,13 +106,30 @@ def create_notification(user_id, notif_type, title, message, ticket_id=None, lin
 # ─── Email Notification ───────────────────────────────────────────────────────
 
 def send_email(subject, recipients, html_body):
-    """Send an email; silently log errors so it never blocks the main flow."""
-    try:
-        msg = Message(subject=subject, recipients=recipients, html=html_body)
-        mail.send(msg)
-        logger.info(f'[EMAIL SENT] subject="{subject}" to={recipients}')
-    except Exception as exc:
-        logger.error(f'[EMAIL ERROR] Failed to send "{subject}" to {recipients}: {exc}')
+    """
+    Send an email in a background thread so it never blocks the request.
+
+    Flask-Mail opens an SMTP connection synchronously. Running it in the main
+    request thread means a slow or failing SMTP server delays the entire
+    response — including the WebSocket notification push that follows.
+    Using a daemon thread isolates SMTP failures from the request lifecycle.
+    """
+    from threading import Thread
+    from flask import current_app
+
+    app = current_app._get_current_object()   # real app, not the proxy
+
+    def _send():
+        with app.app_context():
+            try:
+                msg = Message(subject=subject, recipients=recipients, html=html_body)
+                mail.send(msg)
+                logger.info(f'[EMAIL SENT] subject="{subject}" to={recipients}')
+            except Exception as exc:
+                logger.error(f'[EMAIL ERROR] Failed to send "{subject}" to {recipients}: {exc}')
+
+    t = Thread(target=_send, daemon=True)
+    t.start()
 
 
 # ─── Ticket Event Helpers ─────────────────────────────────────────────────────
@@ -252,4 +280,4 @@ def notify_assignment(ticket, assigned_by):
             [ticket.assignee.email],
             html,
         )
-    logger.info(f'[TICKET ASSIGN] ticket_id={ticket.id} assigned_to={ticket.assigned_to_id} by={assigned_by.id}')
+    logger.info(f'[TICKET ASSIGN] ticket_id={ticket.id} assigned_to={ticket.assigned_to_id} by={assigned_by.id}')