Change service name to InsertionService

Fix `Create()` signature and change name to `Insert`'

Author: C

benchttp/service.go

@@ -1,8 +1,10 @@
 package benchttp
 
-// StatsService defines the interface to implement by a
-// service facade inside the application.
-type StatsService interface {
+import "github.com/benchttp/worker/stats"
+
+// InsertService defines the interface to implement by a
+// data layer facade.
+type InsertionService interface {
 	// Create stores stats in database.
-	Create() error
+	Insert(stats.Stats, string, string, string) error
 }

postgresql/stats.go

@@ -7,7 +7,7 @@ import (
 )
 
 // nolint:gocognit
-func (s StatsService) Create(statsToStore stats.Stats, statsID, userID, tag string) error {
+func (s StatsService) Insert(statsToStore stats.Stats, statsID, userID, tag string) error {
 	tx, err := s.db.Begin()
 	if err != nil {
 		return err