Revert removal of unneeded code

app/service/statistics.py

@@ -1,7 +1,8 @@
 from collections import defaultdict
+from datetime import datetime
 
 from app.dao.date_util import get_months_for_financial_year
-from app.models import NOTIFICATION_TYPES
+from app.models import NOTIFICATION_STATUS_TYPES, NOTIFICATION_TYPES
 
 
 def format_statistics(statistics):
@@ -54,6 +55,26 @@ def create_stats_dict():
     return stats_dict
 
 
+def format_monthly_template_notification_stats(year, rows):
+    stats = {
+        datetime.strftime(date, "%Y-%m"): {}
+        for date in [datetime(year, month, 1) for month in range(4, 13)]
+        + [datetime(year + 1, month, 1) for month in range(1, 4)]
+    }
+
+    for row in rows:
+        formatted_month = row.month.strftime("%Y-%m")
+        if str(row.template_id) not in stats[formatted_month]:
+            stats[formatted_month][str(row.template_id)] = {
+                "name": row.name,
+                "type": row.template_type,
+                "counts": dict.fromkeys(NOTIFICATION_STATUS_TYPES, 0),
+            }
+        stats[formatted_month][str(row.template_id)]["counts"][row.status] += row.count
+
+    return stats
+
+
 def create_zeroed_stats_dicts():
     return {
         template_type: {status: 0 for status in ("requested", "delivered", "failed")}