Optimize task statistics for projects dashboard and statistics reporter

apiserver/bll/project/project_bll.py

@@ -341,6 +341,17 @@ class ProjectBLL:
     ) -> Tuple[Sequence, Sequence]:
         archived = EntityVisibility.archived.value
 
+        def project_task_fields():
+            return {
+                "$project": {
+                    "project": 1,
+                    "status": 1,
+                    "system_tags": 1,
+                    "started": 1,
+                    "completed": 1,
+                }
+            }
+
         def ensure_valid_fields():
             """
             Make sure system tags is always an array (required by subsequent $in in archived_tasks_cond
@@ -368,6 +379,7 @@ class ProjectBLL:
                     users=users,
                 )
             },
+            project_task_fields(),
             ensure_valid_fields(),
             {
                 "$group": {
@@ -516,6 +528,7 @@ class ProjectBLL:
                     users=users,
                 )
             },
+            project_task_fields(),
             ensure_valid_fields(),
             {
                 # for each project

apiserver/bll/statistics/stats_reporter.py

@@ -254,6 +254,14 @@ class StatisticsReporter:
                     **({"last_worker": {"$in": workers}} if workers else {}),
                 }
             },
+            {
+                "$project": {
+                    "last_worker": 1,
+                    "last_update": 1,
+                    "started": 1,
+                    "last_iteration": 1,
+                }
+            },
             {
                 "$group": {
                     "_id": "$last_worker" if workers else None,