diff --git a/store/db/sqlite/memo.go b/store/db/sqlite/memo.go
index 95e1a2e..893a7d2 100644
--- a/store/db/sqlite/memo.go
+++ b/store/db/sqlite/memo.go
@@ -2,7 +2,6 @@ package sqlite
 
 import (
 	"context"
-	"database/sql"
 	"fmt"
 	"strings"
 
@@ -178,16 +177,6 @@ func (d *DB) DeleteMemo(ctx context.Context, delete *store.DeleteMemo) error {
 	return nil
 }
 
-func vacuumMemo(ctx context.Context, tx *sql.Tx) error {
-	stmt := `DELETE FROM memo WHERE creator_id NOT IN (SELECT id FROM user)`
-	_, err := tx.ExecContext(ctx, stmt)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
 func placeholders(n int) string {
 	return strings.Repeat("?,", n-1) + "?"
 }
diff --git a/store/db/sqlite/user.go b/store/db/sqlite/user.go
index 742c083..d7dc385 100644
--- a/store/db/sqlite/user.go
+++ b/store/db/sqlite/user.go
@@ -166,9 +166,6 @@ func (d *DB) DeleteUser(ctx context.Context, delete *store.DeleteUser) error {
 	if err := vacuumShortcut(ctx, tx); err != nil {
 		return err
 	}
-	if err := vacuumMemo(ctx, tx); err != nil {
-		return err
-	}
 	if err := vacuumCollection(ctx, tx); err != nil {
 		return err
 	}