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method Savepoint.prototype.release
import { Savepoint } from "https://deno.land/x/postgres@v0.17.0/query/transaction.ts";

Releasing a savepoint will remove it's last instance in the transaction

import { Client } from "../client.ts";

const client = new Client();
const transaction = client.createTransaction("transaction");

const savepoint = await transaction.savepoint("n1");
await savepoint.release();
transaction.rollback(savepoint); // Error, can't rollback because the savepoint was released

It will also allow you to set the savepoint to the position it had before the last update

import { Client } from "../client.ts";

const client = new Client();
const transaction = client.createTransaction("transaction");

const savepoint = await transaction.savepoint("n1");
await savepoint.update();
await savepoint.release(); // This drops the update of the last statement
transaction.rollback(savepoint); // Will rollback to the first instance of the savepoint

This function will throw if there are no savepoint instances to drop