diff --git a/.runtime-tailleg/DbQuery.class b/.runtime-tailleg/DbQuery.class
deleted file mode 100644
index 1d188b78e..000000000
Binary files a/.runtime-tailleg/DbQuery.class and /dev/null differ
diff --git a/.runtime-tailleg/DbQuery.java b/.runtime-tailleg/DbQuery.java
deleted file mode 100644
index 42d412c31..000000000
--- a/.runtime-tailleg/DbQuery.java
+++ /dev/null
@@ -1,39 +0,0 @@
-import java.sql.Connection;
-import java.sql.DriverManager;
-import java.sql.ResultSet;
-import java.sql.ResultSetMetaData;
-import java.sql.Statement;
-
-public final class DbQuery {
-    public static void main(String[] args) throws Exception {
-        if (args.length < 2) {
-            throw new IllegalArgumentException("usage: DbQuery <database> <sql>");
-        }
-        String url = "jdbc:mysql://127.0.0.1:3306/" + args[0]
-            + "?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai"
-            + "&useSSL=false&allowPublicKeyRetrieval=true";
-        try (Connection connection = DriverManager.getConnection(url, "root", "123456");
-             Statement statement = connection.createStatement()) {
-            boolean hasResult = statement.execute(args[1]);
-            if (!hasResult) {
-                System.out.println("updateCount=" + statement.getUpdateCount());
-                return;
-            }
-            try (ResultSet result = statement.getResultSet()) {
-                ResultSetMetaData meta = result.getMetaData();
-                for (int column = 1; column <= meta.getColumnCount(); column++) {
-                    if (column > 1) System.out.print("\t");
-                    System.out.print(meta.getColumnLabel(column));
-                }
-                System.out.println();
-                while (result.next()) {
-                    for (int column = 1; column <= meta.getColumnCount(); column++) {
-                        if (column > 1) System.out.print("\t");
-                        System.out.print(String.valueOf(result.getObject(column)));
-                    }
-                    System.out.println();
-                }
-            }
-        }
-    }
-}