Remove the archived table template_statistics. The last time the table we updated was August 30 2016, it's safe to say we are done with it.

I updated the InboundSms and TemplateRedacted model to include an index in the db.
Dropped service_permissions.updated_at column since we are not auditting the table

migrations/versions/0106_drop_template_stats.py

@@ -0,0 +1,38 @@
+"""empty message
+
+Revision ID: 0106_drop_template_stats
+Revises: 0105_opg_letter_org
+Create Date: 2017-07-10 14:25:58.494636
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '0106_drop_template_stats'
+down_revision = '0105_opg_letter_org'
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+
+def upgrade():
+    op.drop_table('template_statistics')
+    op.drop_column('service_permissions', 'updated_at')
+
+
+def downgrade():
+    op.add_column('service_permissions',
+                  sa.Column('updated_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=True))
+    op.create_table('template_statistics',
+                    sa.Column('id', postgresql.UUID(), autoincrement=False, nullable=False),
+                    sa.Column('service_id', postgresql.UUID(), autoincrement=False, nullable=False),
+                    sa.Column('template_id', postgresql.UUID(), autoincrement=False, nullable=False),
+                    sa.Column('usage_count', sa.BIGINT(), autoincrement=False, nullable=False),
+                    sa.Column('day', sa.DATE(), autoincrement=False, nullable=False),
+                    sa.Column('updated_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+                    sa.ForeignKeyConstraint(['service_id'], ['services.id'],
+                                            name='template_statistics_service_id_fkey'),
+                    sa.ForeignKeyConstraint(['template_id'], ['templates.id'],
+                                            name='template_statistics_template_id_fkey'),
+                    sa.PrimaryKeyConstraint('id', name='template_statistics_pkey')
+                    )