SIENTIAPDE-1193

Update requirements and refactor Gates activity for improved datetime handling

- Update sientia-dataops-library reference in requirements.txt to version 1.4.3.
- Refactor datetime handling in Gates activity to use a consistent format with timezone support, replacing direct datetime calls with a centralized now() function and DATETIME_FORMAT_WITH_TZ constant.

laborious/activities/gates.py

@@ -7,6 +7,7 @@ with workflow.unsafe.imports_passed_through():
     from sientia_do.notifications.models import NotificationLevel
     from sientia_do.temporal.activities.base import BaseActivity
     from sientia_do.observability.logger import Logger
+    from sientia_do.temporal.constants import DATETIME_FORMAT_WITH_TZ, now
     from laborious.utils.filters.mlflow_filters import nan_values_filter, api_error_filter
     from typing import Any
     from laborious.utils.filters.conditional_filters import (
@@ -14,7 +15,6 @@ with workflow.unsafe.imports_passed_through():
         filter_specific_variables_null_values
     )
     from pandas import DataFrame
-    from datetime import datetime
     from laborious import metrics
 
 input_filter_functions = {
@@ -319,12 +319,15 @@ class Gates(BaseActivity):
         data = DataFrame(input_data['data'])
 
         if data.empty:
-            return datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+            return now().strftime(DATETIME_FORMAT_WITH_TZ)
+
+        max_timestamp = max(
+            data['timestamp'].values.tolist()).strftime(DATETIME_FORMAT_WITH_TZ)
 
         self.info(
-            f"Last timestamp: {max(data['timestamp'].values.tolist())}", metadata)
+            f"Last timestamp: {max_timestamp}", metadata)
 
-        return max(data['timestamp'].values.tolist())
+        return max_timestamp
 
     @activity.defn(name="write_metrics")
     async def write_metrics(self, input_data: dict[str, Any]):