PostgresQL store for Automerge Repo

This module implements a PostgresQL storage adapter for Automerge Repo.

Example usage

``js
import { PostgresStorageAdapter } from "automerge-repo-storage-postgres";
import { Repo } from "@automerge/automerge-repo";

const repo = new Repo({
network: [],
storage: new PostgresStorageAdapter("my_table")
});
`

Database configuration

By default, the database configuration is read from environment variables. To specify configuration parameters programmatically, pass an instance of pg.Pool.

`js
import pg from "pg";
import { PostgresStorageAdapter } from "automerge-repo-storage-postgres";
import { Repo } from "@automerge/automerge-repo";

const pool = new pg.Pool({
host: "my_server",
db: "my_db",
user: "my_user",
password: "hunter2",
max: 20,
idleTimeoutMillis: 30000,
connectionTimeoutMillis: 2000,
});
const pg_storage = new PostgresStorageAdapter("my_table", pool);
const repo = new Repo({
network: []
storage: pg_storage
});
`

Table layout

The storage table should have the following columns:

`sql
CREATE TABLE my_table (
key ARRAY[BYTEA] PRIMARY KEY,
value BYTEA NOT NULL
);
``

Any additional columns will be ignored.