added indices to table

smash/web/migrations/0150_auto_20200406_1144.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2020-04-06 11:44
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('web', '0149_auto_20200406_0926'),
+    ]
+
+    operations = [
+        migrations.AlterIndexTogether(
+            name='provenance',
+            index_together=set([('modified_table', 'modified_table_id')]),
+        ),
+    ]

smash/web/migrations/0151_auto_20200406_1207.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.5 on 2020-04-06 12:07
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('web', '0150_auto_20200406_1144'),
+    ]
+
+    operations = [
+        migrations.AlterIndexTogether(
+            name='provenance',
+            index_together=set([('modified_table', 'modified_table_id', 'modification_date')]),
+        ),
+    ]

smash/web/models/provenance.py

@@ -5,6 +5,7 @@ from django.db import models
 class Provenance(models.Model):
     class Meta:
         app_label = 'web'
+        index_together = ['modified_table', 'modified_table_id', 'modification_date']
 
 
     modified_table = models.CharField(max_length=1024,

smash/web/models/study_subject.py

@@ -17,7 +17,7 @@ class StudySubject(models.Model):
 
     @property
     def provenances(self):
-      return Provenance.objects.filter(modified_table=StudySubject._meta.db_table).filter(modified_table_id=self.id).order_by('-modification_date')
+      return Provenance.objects.filter(modified_table=StudySubject._meta.db_table, modified_table_id=self.id).order_by('-modification_date')
 
     def finish_all_visits(self):
         visits = Visit.objects.filter(subject=self, is_finished=False)

smash/web/models/subject.py

@@ -17,7 +17,7 @@ class Subject(models.Model):
     
     @property
     def provenances(self):
-      return Provenance.objects.filter(modified_table=Subject._meta.db_table).filter(modified_table_id=self.id).order_by('-modification_date')
+        return Provenance.objects.filter(modified_table=Subject._meta.db_table, modified_table_id=self.id).order_by('-modification_date')
 
     sex = models.CharField(max_length=1,
                            choices=SEX_CHOICES,