diff --git a/basic/main.go b/basic/main.go
index cc69a72..0a30137 100644
--- a/basic/main.go
+++ b/basic/main.go
@@ -57,18 +57,6 @@ func (r *Relay) AcceptEvent(evt *nostr.Event) bool {
 	return true
 }
 
-func (r *Relay) BeforeSave(evt *nostr.Event) {
-	// do nothing
-}
-
-func (r *Relay) AfterSave(evt *nostr.Event) {
-	// delete all but the 100 most recent ones for each key
-	r.Storage().(*postgresql.PostgresBackend).DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
-      SELECT created_at FROM event WHERE pubkey = $1
-      ORDER BY created_at DESC OFFSET 100 LIMIT 1
-    )`, evt.PubKey, evt.Kind)
-}
-
 func main() {
 	r := Relay{}
 	if err := envconfig.Process("", &r); err != nil {
diff --git a/expensive/main.go b/expensive/main.go
index f5e5fe7..f786833 100644
--- a/expensive/main.go
+++ b/expensive/main.go
@@ -70,18 +70,6 @@ func (r *Relay) AcceptEvent(evt *nostr.Event) bool {
 	return true
 }
 
-func (r *Relay) BeforeSave(evt *nostr.Event) {
-	// do nothing
-}
-
-func (r *Relay) AfterSave(evt *nostr.Event) {
-	// delete all but the 1000 most recent ones for each key
-	r.Storage().(*postgresql.PostgresBackend).DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
-      SELECT created_at FROM event WHERE pubkey = $1
-      ORDER BY created_at DESC OFFSET 1000 LIMIT 1
-    )`, evt.PubKey, evt.Kind)
-}
-
 func main() {
 	r := Relay{}
 	if err := envconfig.Process("", &r); err != nil {
diff --git a/storage/postgresql/save.go b/storage/postgresql/save.go
index 5280f7d..811cd3f 100644
--- a/storage/postgresql/save.go
+++ b/storage/postgresql/save.go
@@ -40,3 +40,15 @@ func (b *PostgresBackend) SaveEvent(evt *nostr.Event) error {
 
 	return nil
 }
+
+func (b *PostgresBackend) BeforeSave(evt *nostr.Event) {
+	// do nothing
+}
+
+func (b *PostgresBackend) AfterSave(evt *nostr.Event) {
+	// delete all but the 100 most recent ones for each key
+	b.DB.Exec(`DELETE FROM event WHERE pubkey = $1 AND kind = $2 AND created_at < (
+      SELECT created_at FROM event WHERE pubkey = $1
+      ORDER BY created_at DESC OFFSET 100 LIMIT 1
+    )`, evt.PubKey, evt.Kind)
+}