fix: update metric names in Facebook analytics

src/facebook/facebook_client.py

@@ -70,10 +70,12 @@ def get_total_reach(
     ) -> List[Tuple[datetime, int]]:
         """
         Get statistics on the total reach of new posts.
+        NOTE: 'page_posts_impressions_unique' is deprecated in v19.0.
+        Using 'page_impressions_unique' (Total Page Reach) as replacement.
         """
         batches = self._get_all_batches(
             connection_name="insights",
-            metric="page_posts_impressions_unique",
+            metric="page_impressions_unique",
             period=period.value,
             since=since,
             until=until,
@@ -91,7 +93,7 @@ def get_organic_reach(
         """
         batches = self._get_all_batches(
             connection_name="insights",
-            metric="page_posts_impressions_organic_unique",
+            metric="page_impressions_organic_unique",
             period=period.value,
             since=since,
             until=until,
@@ -127,7 +129,7 @@ def get_new_fan_count(
         """
         batches = self._get_all_batches(
             connection_name="insights",
-            metric="page_fan_adds_unique",
+            metric="page_daily_follows_unique",
             period=period.value,
             since=since,
             until=until,
@@ -147,7 +149,12 @@ def _get_all_batches(
         }
         params.update(kwargs)
         page = self._make_graph_api_call(f"{self._page_id}/{connection_name}", params)
-        result += page["data"]
+
+        if "error" in page:
+            logger.error(f"Error fetching {connection_name}: {page['error']}")
+            return result
+
+        result += page.get("data", [])
         # process next
         result += self._iterate_over_pages(connection_name, since, until, page, True)
         # process previous
@@ -192,10 +199,16 @@ def _iterate_over_pages(
             current_page = self._make_graph_api_call(
                 f"{self._page_id}/{connection_name}", args
             )
+            if "error" in current_page:
+                logger.error(
+                    f"Error in pagination for {connection_name}: {current_page['error']}"
+                )
+                break
+
             if "data" in current_page:
                 result += current_page["data"]
             else:
-                logger.error(f"Error in pagination: {current_page}")
+                logger.warning(f"No data found in pagination response: {current_page}")
                 break
         return result