Fix task and model last_change handling

Improve db model index
Improve db model infrastructure

apiserver/database/model/auth.py

@@ -52,7 +52,7 @@ class Credentials(EmbeddedDocument):
 
 
 class User(DbModelMixin, AuthDocument):
-    meta = {"db_alias": Database.auth, "strict": strict}
+    meta = {"db_alias": Database.auth, "strict": strict, "indexes": ["email"]}
 
     id = StringField(primary_key=True)
     name = StringField()

apiserver/database/model/base.py

@@ -701,14 +701,24 @@ class GetMixin(PropsMixin):
 
 
 class UpdateMixin(object):
+    __user_set_allowed_fields = None
+    __locked_when_published_fields = None
+
     @classmethod
     def user_set_allowed(cls):
-        res = getattr(cls, "__user_set_allowed_fields", None)
-        if res is None:
-            res = cls.__user_set_allowed_fields = get_fields_choices(
-                cls, "user_set_allowed"
+        if cls.__user_set_allowed_fields is None:
+            cls.__user_set_allowed_fields = dict(
+                get_fields_choices(cls, "user_set_allowed")
             )
-        return res
+        return cls.__user_set_allowed_fields
+
+    @classmethod
+    def locked_when_published(cls):
+        if cls.__locked_when_published_fields is None:
+            cls.__locked_when_published_fields = dict(
+                get_fields_choices(cls, "locked_when_published")
+            )
+        return cls.__locked_when_published_fields
 
     @classmethod
     def get_safe_update_dict(cls, fields):

apiserver/database/model/task/task.py

@@ -155,6 +155,8 @@ class Task(AttributedDocument):
             "project",
             ("company", "name"),
             ("company", "user"),
+            ("company", "status", "type"),
+            ("company", "system_tags", "last_update"),
             ("company", "type", "system_tags", "status"),
             ("company", "project", "type", "system_tags", "status"),
             ("status", "last_update"),  # for maintenance tasks
@@ -215,6 +217,7 @@ class Task(AttributedDocument):
     last_worker = StringField()
     last_worker_report = DateTimeField()
     last_update = DateTimeField()
+    last_change = DateTimeField()
     last_iteration = IntField(default=DEFAULT_LAST_ITERATION)
     last_metrics = SafeMapField(field=SafeMapField(EmbeddedDocumentField(MetricEvent)))
     metric_stats = SafeMapField(field=EmbeddedDocumentField(MetricEventStats))