public static Field<Timestamp> epochMsToTimestamp(Field<? extends Number> field) {
        return DSL.field("from_unixtime({0} / 1000)", SQLDataType.TIMESTAMP, field);
    }
Converts a time in millis since epoch to a {@link java.sql.Timestamp}
stroom-db-util/src/main/java/stroom/db/util/JooqUtil.java