Add dbindex on target

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/migrations/0036_auto_20150630_1212.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('trans', '0035_auto_20150630_1208'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='unit',
+            name='target',
+            field=models.TextField(default=b'', db_index=True, blank=True),
+        ),
+    ]

weblate/trans/models/unit.py

@@ -319,7 +319,7 @@ class Unit(models.Model):
     flags = models.TextField(default='', blank=True)
     source = models.TextField()
     previous_source = models.TextField(default='', blank=True)
-    target = models.TextField(default='', blank=True)
+    target = models.TextField(default='', blank=True, db_index=True)
     fuzzy = models.BooleanField(default=False, db_index=True)
     translated = models.BooleanField(default=False, db_index=True)
     position = models.IntegerField(db_index=True)