add model fact recent

* Copy of the most recent system tracking fact for each module type.
Utimately, this allows us to GIN index the jsonb object to support
fact searching.

awx/main/migrations/0037_v320_fact_recent.py

@@ -0,0 +1,43 @@
+# -*- coding: utf-8 -*-
+# Python
+from __future__ import unicode_literals
+
+# Django
+from django.db import migrations, models
+
+from psycopg2.extensions import AsIs
+
+# AWX
+import awx.main.fields
+from awx.main.models import FactRecent
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0036_v311_insights'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='FactRecent',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('timestamp', models.DateTimeField(default=None, help_text='Date and time of the corresponding fact scan gathering time.', editable=False)),
+                ('module', models.CharField(max_length=128)),
+                ('facts', awx.main.fields.JSONBField(default={}, help_text='Arbitrary JSON structure of module facts captured at timestamp for a single host.', blank=True)),
+                ('host', models.ForeignKey(related_name='facts_recent', to='main.Host', help_text='Host for the facts that the fact scan captured.')),
+            ],
+        ),
+        migrations.AlterField(
+            model_name='fact',
+            name='facts',
+            field=awx.main.fields.JSONBField(default={}, help_text='Arbitrary JSON structure of module facts captured at timestamp for a single host.', blank=True),
+        ),
+        migrations.AlterIndexTogether(
+            name='factrecent',
+            index_together=set([('timestamp', 'module', 'host')]),
+        ),
+        migrations.RunSQL([("CREATE INDEX fact_recent_facts_default_gin ON %s USING gin"
+                            "(facts jsonb_path_ops);", [AsIs(FactRecent._meta.db_table)])]),
+    ]