@harness-kernel/storage-postgres

@harness-kernel/storage-postgres provides PostgresSessionStorage, a session-centric storage backend for hosts that want durable sessions in Postgres.

import { PostgresSessionStorage, migrations } from "@harness-kernel/storage-postgres";

const storage = new PostgresSessionStorage({ client: pool });

for (const migration of migrations) {
  await pool.query(migration.sql);
}

The runtime host attaches it to the session store:

const store = await createHarnessSessionStore({
  agent: { definition: agent },
  providers: [new OpenAIProvider()],
  defaultModel: "openai/gpt-5.1",
  storage,
});

The package expects the host to own the Postgres pool/client lifecycle. Tests that require a real database run only when HARNESS_KERNEL_POSTGRES_URL is configured.