add new AllServiceStatistics query

dal/db_query/queries.sql

@@ -610,4 +610,25 @@ WHERE
     question.quiz_id = $1 AND deleted = false;
 
 -- name: GetQidOwner :one
-SELECT accountid FROM quiz where qid=$1;
+SELECT accountid FROM quiz where qid=$1;
+
+-- name: AllServiceStatistics :one
+WITH Registrations AS (
+    SELECT COUNT(*) AS registration_count
+    FROM account
+    WHERE created_at >= to_timestamp($1) AND created_at <= to_timestamp($2)
+),
+     Quizes AS (
+         SELECT COUNT(*) AS quiz_count
+         FROM quiz
+         WHERE deleted = false AND created_at >= to_timestamp($1) AND created_at <= to_timestamp($2)
+     ),
+     Results AS (
+         SELECT COUNT(*) AS result_count
+         FROM answer
+         WHERE result = true AND created_at >= to_timestamp($1) AND created_at <= to_timestamp($2)
+     )
+SELECT
+    (SELECT registration_count FROM Registrations) AS registrations,
+    (SELECT quiz_count FROM Quizes) AS quizes,
+    (SELECT result_count FROM Results) AS results;

repository/statistics/statistics.go

@@ -145,3 +145,14 @@ func (r *StatisticsRepository) GetQuestionsStatistics(ctx context.Context, req D
 
 	return resp, nil
 }
+
+type StatisticResp struct {
+	// от from до to
+	Registrations uint64 // количество зарегестрированных аккаунтов
+	Quizes        uint64 // количество созданных не удаленных квизов
+	Results       uint64 // количество ответов с result = true
+}
+
+func (r *StatisticsRepository) AllServiceStatistics(ctx context.Context, from, to uint64) (StatisticResp, error) {
+	allSvcStats, err := r.queries.AllServiceStatistics
+}