Add query to get template usage from the Notifications History table

- groups by template Id and Day.

Returns count per day, template name, template id, template type, and day.

Ordered by day (desc) and template name (acc)

app/dao/notifications_dao.py

@@ -9,7 +9,6 @@ from flask import current_app
 from werkzeug.datastructures import MultiDict
 from sqlalchemy import (desc, func, Integer, or_, and_, asc)
 from sqlalchemy.sql.expression import cast
-from notifications_utils.template import get_sms_fragment_count
 
 from app import db
 from app.dao import days_ago
@@ -135,6 +134,28 @@ def dao_get_7_day_agg_notification_statistics_for_service(service_id,
     )
 
 
+@statsd(namespace="dao")
+def dao_get_template_usage(service_id, limit_days=None):
+
+    query = db.session.query(
+        func.count(NotificationHistory.template_id).label('count'),
+        NotificationHistory.template_id,
+        func.DATE(NotificationHistory.created_at).label('day'),
+        Template.name,
+        Template.template_type
+    )
+
+    query_filter = [NotificationHistory.service_id == service_id]
+    if limit_days is not None:
+        query_filter.append(NotificationHistory.created_at >= days_ago(limit_days))
+
+    return query.filter(*query_filter) \
+        .join(Template)\
+        .group_by(NotificationHistory.template_id, func.DATE(NotificationHistory.created_at), Template.name, Template.template_type)\
+        .order_by(desc(func.DATE(NotificationHistory.created_at)), asc(Template.name))\
+        .all()  # noqa
+
+
 @statsd(namespace="dao")
 def dao_get_template_statistics_for_service(service_id, limit_days=None):
     query_filter = [TemplateStatistics.service_id == service_id]