SIENTIAPDE-1193

refactor: standardize timestamp handling across MongoDB and SlotManager

- Replaced instances of `now()` with `date_now` for consistent timestamp usage in MongoDB and SlotManager activities.
- Updated test cases to mock the new `now()` function, ensuring accurate timestamp handling in unit tests.
- Adjusted timestamp formatting in various tests to align with the DATETIME_FORMAT_MS_WITH_TZ standard.

orchestrator/activities/mongo_db.py

@@ -216,7 +216,7 @@ class MongoDB(BaseActivity):
         """
         updated_pipelines = input_data.get("updated_pipelines", [])
         metadata = input_data.get("metadata", {})
-        now = now()
+        date_now = now()
         collection = self.database["orchestrated_schedules"]
 
         self.info("Updating pipelines timestamps...", metadata=metadata)
@@ -233,7 +233,7 @@ class MongoDB(BaseActivity):
         try:
             collection.update_many(
                 data_filter,
-                {"$set": {"updated_at": now}}
+                {"$set": {"updated_at": date_now}}
             )
             success_count += 1
         except Exception as e:
@@ -267,12 +267,12 @@ class MongoDB(BaseActivity):
 
         success_count = 0
 
-        now = now()
+        date_now = now()
 
         argument = [
             {"schedule_name": pipeline["schedule_name"],
              "namespace": pipeline["namespace"],
-             "updated_at": now}
+             "updated_at": date_now}
             for pipeline in created_pipelines if pipeline["success"]
         ]
         data_filter = argument if argument else {}

orchestrator/activities/slot_manager.py

@@ -382,12 +382,12 @@ class SlotManager(Redis):
 
         self.info("Storing notification cache...", metadata=metadata)
 
-        now = now().strftime(DATETIME_FORMAT_MS_WITH_TZ)
+        date_now = now().strftime(DATETIME_FORMAT_MS_WITH_TZ)
 
         for index, row in log_report.iterrows():
             status = row['status']
             if status == 'sent':
                 key = f"{row['schedule']}:{row['notification_id']}"
-                self.set(key, now, ttl=sent_ttl)
+                self.set(key, date_now, ttl=sent_ttl)
 
         self.info("Notification cache stored...", metadata=metadata)