fix: open timeline.csv and alerts_timeline.csv with write mode to prevent cross run contamination

src/mvt/common/alerts.py

@@ -219,7 +219,7 @@ class AlertStore:
         return alerts
 
     def save_timeline(self, timeline_path: str) -> None:
-        with open(timeline_path, "a+", encoding="utf-8") as handle:
+        with open(timeline_path, "w", encoding="utf-8") as handle:
             csvoutput = csv.writer(
                 handle,
                 delimiter=",",

src/mvt/common/module.py

@@ -259,7 +259,7 @@ def save_timeline(timeline: list, timeline_path: str, is_utc: bool = True) -> No
     :param timeline_path: Path to the csv file to store the timeline to
 
     """
-    with open(timeline_path, "a+", encoding="utf-8") as handle:
+    with open(timeline_path, "w", encoding="utf-8") as handle:
         csvoutput = csv.writer(
             handle, delimiter=",", quotechar='"', quoting=csv.QUOTE_ALL, escapechar="\\"
         )