add Index_constraint, remove none feature values, add recommand index column,...

add Index_constraint, remove none feature values, add recommand index column, fix time frame filter, improve outlook

models/models.py

@@ -6,7 +6,7 @@ class Observation_Spec:
     def __init__(self, tablename:str, type:str, label:list[str], features_name:list = None):
         self.tablename = tablename
         self.type = type    # 'event' or 'measurement'
-        self.label = label  # (self-define or from column, column name, column value or self-define label)
+        self.label = label  # [self-define or from column, column name, column value or self-define label]
         self.features_name = features_name if features_name else []
 
     def add_feature(self, name):
@@ -44,22 +44,6 @@ class Obesrvation(Observation_Spec):
     def add_feature(self, feature_name, feature_value):
         self.features[feature_name] = feature_value
 
-# class Segment_Spec:
-#     def __init__(self, type, label, features=None):
-#         self.type = type    # 'event' or 'measurement'
-#         self.label = label
-#         self.features = features if features else {}
-
-#     def add_feature(self, feature_name):
-#         self.features[feature_name] = feature_value
-
-# class Segment(Segment_Spec):
-#     def __init__(self, time, type, object, label, features=None):
-#         super().__init__(type, label, features=None)
-#         self.time = time
-#         self.object = object
-
-
 
 class Theme:
     def __init__(self, color, fillcolor, fillcolorC,