Migrate from API v1 to v2

export GIGSTACK_BASE_URL='https://api.gigstack.io/v2'
read -rsp 'gigstack test API key: ' GIGSTACK_API_KEY; echo
export GIGSTACK_API_KEY

curl --fail-with-body --get "$GIGSTACK_BASE_URL/clients" \
  -H "Authorization: Bearer $GIGSTACK_API_KEY" \
  --data-urlencode 'limit=2' > migration-clients.json

jq '{count: (.data | length), has_more, next}' migration-clients.json

const base = process.env.GIGSTACK_BASE_URL
const key = process.env.GIGSTACK_API_KEY
if (!base || !key) throw new Error('Set GIGSTACK_BASE_URL and GIGSTACK_API_KEY')

async function* listClients() {
    let next
    const cursors = new Set()
    // This limit is a local guard, not an API limit. Raise it deliberately if needed.
    for (let page = 0; page < 10000; page++) {
        const url = new URL(`${base.replace(/\/$/, '')}/clients`)
        url.searchParams.set('limit', '100')
        if (next) url.searchParams.set('next', next)
        const response = await fetch(url, {
            headers: { Authorization: `Bearer ${key}` },
            signal: AbortSignal.timeout(30000),
        })
        if (!response.ok) throw new Error(`Customer list returned HTTP ${response.status}`)
        const body = await response.json()
        if (!Array.isArray(body.data) || typeof body.has_more !== 'boolean') {
            throw new Error('Unexpected customer list response')
        }
        for (const client of body.data) yield client
        if (!body.has_more) return
        if (typeof body.next !== 'string' || !body.next || cursors.has(body.next)) {
            throw new Error('Missing or repeated pagination cursor')
        }
        cursors.add(body.next)
        next = body.next
    }
    throw new Error('Stopped at the local pagination guard; export is incomplete')
}

let count = 0
for await (const client of listClients()) count++
console.log(`Read ${count} customers`)