diff --git a/backend/requirements.txt b/backend/requirements.txt
index 429cf19..ff46e02 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -18,3 +18,4 @@ python-multipart==0.0.12
 apscheduler==3.10.4
 pytz==2024.2
 ta==0.11.0
+lxml>=5.0.0
diff --git a/backend/services/ai_analyzer.py b/backend/services/ai_analyzer.py
index c7b053a..4388384 100644
--- a/backend/services/ai_analyzer.py
+++ b/backend/services/ai_analyzer.py
@@ -738,7 +738,9 @@ Return ONLY this valid JSON:
 
     # Extract the return-schema portion from `user` so batches use the identical full schema
     # (includes bucket id/label/max definitions that GPT-4o needs to populate correctly)
-    _return_schema = user.split("Retourne UNIQUEMENT ce JSON valide:\n", 1)[1]
+    _split_key = "Return ONLY this valid JSON:\n"
+    _parts = user.split(_split_key, 1)
+    _return_schema = _parts[1] if len(_parts) == 2 else user
 
     # Build lessons feedback block for the scorer
     lessons_header = ""
diff --git a/backend/services/database.py b/backend/services/database.py
index 91190d2..edbe761 100644
--- a/backend/services/database.py
+++ b/backend/services/database.py
@@ -4,7 +4,7 @@ SQLite persistence layer for portfolio positions, custom patterns, and config.
 import sqlite3
 import json
 import os
-from datetime import datetime
+from datetime import datetime, timedelta
 from typing import List, Dict, Any, Optional
 
 DB_PATH = os.path.join(os.path.dirname(__file__), "..", "data", "geooptions.db")