diff --git a/server/database/model/model.py b/server/database/model/model.py
index bb42e80..7aa7219 100644
--- a/server/database/model/model.py
+++ b/server/database/model/model.py
@@ -12,35 +12,32 @@ from database.model.user import User
 
 class Model(DbModelMixin, Document):
     meta = {
-        'db_alias': Database.backend,
-        'strict': strict,
-        'indexes': [
+        "db_alias": Database.backend,
+        "strict": strict,
+        "indexes": [
+            "parent",
+            "project",
+            "task",
+            ("company", "name"),
             {
-                'name': '%s.model.main_text_index' % Database.backend,
-                'fields': [
-                    '$name',
-                    '$id',
-                    '$comment',
-                    '$parent',
-                    '$task',
-                    '$project',
-                ],
-                'default_language': 'english',
-                'weights': {
-                    'name': 10,
-                    'id': 10,
-                    'comment': 10,
-                    'parent': 5,
-                    'task': 3,
-                    'project': 3,
-                }
-            }
+                "name": "%s.model.main_text_index" % Database.backend,
+                "fields": ["$name", "$id", "$comment", "$parent", "$task", "$project"],
+                "default_language": "english",
+                "weights": {
+                    "name": 10,
+                    "id": 10,
+                    "comment": 10,
+                    "parent": 5,
+                    "task": 3,
+                    "project": 3,
+                },
+            },
         ],
     }
 
     id = StringField(primary_key=True)
     name = StrippedStringField(user_set_allowed=True, min_length=3)
-    parent = StringField(reference_field='Model', required=False)
+    parent = StringField(reference_field="Model", required=False)
     user = StringField(required=True, reference_field=User)
     company = StringField(required=True, reference_field=Company)
     project = StringField(reference_field=Project, user_set_allowed=True)
@@ -49,9 +46,11 @@ class Model(DbModelMixin, Document):
     comment = StringField(user_set_allowed=True)
     tags = ListField(StringField(required=True), user_set_allowed=True)
     system_tags = ListField(StringField(required=True), user_set_allowed=True)
-    uri = StrippedStringField(default='', user_set_allowed=True)
+    uri = StrippedStringField(default="", user_set_allowed=True)
     framework = StringField()
     design = SafeDictField()
     labels = ModelLabels()
     ready = BooleanField(required=True)
-    ui_cache = SafeDictField(default=dict, user_set_allowed=True, exclude_by_default=True)
+    ui_cache = SafeDictField(
+        default=dict, user_set_allowed=True, exclude_by_default=True
+    )
diff --git a/server/database/model/project.py b/server/database/model/project.py
index 2accb3b..d961440 100644
--- a/server/database/model/project.py
+++ b/server/database/model/project.py
@@ -17,12 +17,13 @@ class Project(AttributedDocument):
         "db_alias": Database.backend,
         "strict": strict,
         "indexes": [
+            ("company", "name"),
             {
                 "name": "%s.project.main_text_index" % Database.backend,
                 "fields": ["$name", "$id", "$description"],
                 "default_language": "english",
                 "weights": {"name": 10, "id": 10, "description": 10},
-            }
+            },
         ],
     }
 
diff --git a/server/database/model/task/task.py b/server/database/model/task/task.py
index 0b55aa5..b159233 100644
--- a/server/database/model/task/task.py
+++ b/server/database/model/task/task.py
@@ -110,6 +110,12 @@ class Task(AttributedDocument):
             "created",
             "started",
             "completed",
+            "parent",
+            "project",
+            ("company", "name"),
+            ("company", "type", "system_tags", "status"),
+            ("company", "project", "type", "system_tags", "status"),
+            ("status", "last_update"),  # for maintenance tasks
             {
                 "name": "%s.task.main_text_index" % Database.backend,
                 "fields": [
diff --git a/server/services/projects.py b/server/services/projects.py
index c7dc548..ff98102 100644
--- a/server/services/projects.py
+++ b/server/services/projects.py
@@ -33,8 +33,7 @@ create_fields = {
 }
 
 get_all_query_options = Project.QueryParameterOptions(
-    pattern_fields=("name", "description"),
-    list_fields=("tags", "system_tags", "id"),
+    pattern_fields=("name", "description"), list_fields=("tags", "system_tags", "id"),
 )
 
 
@@ -58,7 +57,7 @@ def get_by_id(call):
         call.result.data = {"project": project_dict}
 
 
-def make_projects_get_all_pipelines(project_ids, specific_state=None):
+def make_projects_get_all_pipelines(company_id, project_ids, specific_state=None):
     archived = EntityVisibility.archived.value
 
     def ensure_valid_fields():
@@ -74,15 +73,18 @@ def make_projects_get_all_pipelines(project_ids, specific_state=None):
                         "else": "$system_tags",
                     }
                 },
-                "status": {
-                    "$ifNull": ["$status", "unknown"]
-                }
+                "status": {"$ifNull": ["$status", "unknown"]},
             }
         }
 
     status_count_pipeline = [
         # count tasks per project per status
-        {"$match": {"project": {"$in": project_ids}}},
+        {
+            "$match": {
+                "company": {"$in": [None, "", company_id]},
+                "project": {"$in": project_ids},
+            }
+        },
         ensure_valid_fields(),
         {
             "$group": {
@@ -153,7 +155,10 @@ def make_projects_get_all_pipelines(project_ids, specific_state=None):
         {
             "$match": {
                 "type": {"$in": ["training", "testing", "annotation"]},
-                "project": {"$in": project_ids},
+                "project": {
+                    "company": {"$in": [None, "", company_id]},
+                    "$in": project_ids,
+                },
             }
         },
         ensure_valid_fields(),
@@ -195,7 +200,7 @@ def get_all_ex(call: APICall):
 
         ids = [project["id"] for project in projects]
         status_count_pipeline, runtime_pipeline = make_projects_get_all_pipelines(
-            ids, specific_state=specific_state
+            call.identity.company, ids, specific_state=specific_state
         )
 
         default_counts = dict.fromkeys(get_options(TaskStatus), 0)
@@ -205,7 +210,7 @@ def get_all_ex(call: APICall):
 
         status_count = defaultdict(lambda: {})
         key = itemgetter(EntityVisibility.archived.value)
-        for result in Task.aggregate(*status_count_pipeline):
+        for result in Task.aggregate(status_count_pipeline):
             for k, group in groupby(sorted(result["counts"], key=key), key):
                 section = (
                     EntityVisibility.archived if k else EntityVisibility.active
@@ -219,7 +224,7 @@ def get_all_ex(call: APICall):
 
         runtime = {
             result["_id"]: {k: v for k, v in result.items() if k != "_id"}
-            for result in Task.aggregate(*runtime_pipeline)
+            for result in Task.aggregate(runtime_pipeline)
         }
 
     def safe_get(obj, path, default=None):
diff --git a/server/services/tasks.py b/server/services/tasks.py
index 2a9984d..a2bef35 100644
--- a/server/services/tasks.py
+++ b/server/services/tasks.py
@@ -750,8 +750,7 @@ class CleanupResult(object):
     deleted_models = attr.ib(type=int)
 
 
-def cleanup_task(task, force=False):
-    # type: (Task, bool) -> CleanupResult
+def cleanup_task(task: Task, force: bool = False):
     """
     Validate task deletion and delete/modify all its output.
     :param task: task object