code: void delete() {
          StringBuilder sql = new StringBuilder();
          sql.append("DROP SCHEMA ");
          sql.append(this.sqlgGraph.getSqlDialect().maybeWrapInQoutes(this.name));
          if (this.sqlgGraph.getSqlDialect().supportsCascade()) {
              sql.append(" CASCADE");
          }
          if (this.sqlgGraph.getSqlDialect().needsSemicolon()) {
              sql.append(";");
          }
          if (logger.isDebugEnabled()) {
              logger.debug(sql.toString());
          }
          Connection conn = this.sqlgGraph.tx().getConnection();
          try (Statement stmt = conn.createStatement()) {
              stmt.execute(sql.toString());
          } catch (SQLException e) {
              logger.error("schema deletion failed " + this.sqlgGraph.toString(), e);
              throw new RuntimeException(e);
          }
      }
docs: delete schema in DB