Metadata fetcher

[verdigos]

create table address_metadata
(
    address     varchar not null,
    type        varchar not null,
    valid       boolean default true,
    name        varchar,
    description varchar,
    extra       jsonb,
    symbol      varchar,
    image       varchar,
    updated_at  bigint,
    constraint address_metadata_pk
        primary key (address, type)
);
create table background_tasks
(
    id         bigint generated always as identity
        constraint background_tasks_pk
            primary key,
    type       varchar,
    status     varchar,
    retries    integer default 0 not null,
    retry_at   bigint,
    started_at bigint,
    data       jsonb,
    error      varchar
);