fix: deleting inbox records that senders have been deleted (#2743)

Deleting inbox records that senders have been deleted

store/db/mysql/inbox.go

@@ -2,6 +2,7 @@ package mysql
 
 import (
 	"context"
+	"database/sql"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -132,3 +133,13 @@ func (d *DB) DeleteInbox(ctx context.Context, delete *store.DeleteInbox) error {
 	}
 	return nil
 }
+
+func vacuumInbox(ctx context.Context, tx *sql.Tx) error {
+	stmt := "DELETE FROM `inbox` WHERE `sender_id` NOT IN (SELECT `id` FROM `user`)"
+	_, err := tx.ExecContext(ctx, stmt)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}