CREATE OR REPLACE FUNCTION create_invoice(hash TEXT, bolt11 TEXT, expires_at timestamp(3) without time zone, msats_req INTEGER, user_id INTEGER) RETURNS "Invoice" LANGUAGE plpgsql AS $$ DECLARE invoice "Invoice"; limit_reached BOOLEAN; too_much BOOLEAN; BEGIN PERFORM ASSERT_SERIALIZED(); SELECT count(*) >= 10, sum("msatsRequested")+max(users.msats)+msats_req > 1000000000 INTO limit_reached, too_much FROM "Invoice" JOIN users on "userId" = users.id WHERE "userId" = user_id AND "expiresAt" > now_utc() AND "confirmedAt" is null AND cancelled = false; -- prevent more than 10 pending invoices IF limit_reached THEN RAISE EXCEPTION 'SN_INV_PENDING_LIMIT'; END IF; -- prevent pending invoices + msats from exceeding 1,000,000 sats IF too_much THEN RAISE EXCEPTION 'SN_INV_EXCEED_BALANCE'; END IF; INSERT INTO "Invoice" (hash, bolt11, "expiresAt", "msatsRequested", "userId", created_at, updated_at) VALUES (hash, bolt11, expires_at, msats_req, user_id, now_utc(), now_utc()) RETURNING * INTO invoice; INSERT INTO pgboss.job (name, data, retrylimit, retrybackoff, startafter) VALUES ('checkInvoice', jsonb_build_object('hash', hash), 21, true, now() + interval '10 seconds'); RETURN invoice; END; $$;