Support for adding pre-computed HLL entries into an HLL table

I have developed a framework that periodically produces several HLL entries using the [java-hll](https://github.com/aggregateknowledge/java-hll) library, and am looking for a way to insert them directly into a Postgres table so as to keep a running total, etc.

The java-hll library README has the following entry, but I am unsure how to take the generated hex output and insert it into an existing table:

"Writing an HLL to its hex representation of storage specification, v1.0.0 (for example, to be inserted into a PostgreSQL database):

```
final byte[] bytes = hll.toBytes();
final String output = "\\x" + NumberUtil.toHex(bytes, 0, bytes.length)
```
"

Any advise on how to leverage both of these technologies would be greatly appreciated, as it seems that the additive nature of the data structure makes this scenario seem plausible.