Business Signals EndPoint

<?php
// Run this daily (cron) on your own site. Sends only counts — never personal data.
$key = 'YOUR_SITE_KEY';
$payload = ['signals' => [
    ['metric' => 'users',         'kind' => 'gauge', 'value' => usersTotal(),          'category' => 'users'],
    ['metric' => 'registrations', 'value' => registrationsToday(),                     'category' => 'users'],
    ['metric' => 'payment_requests', 'value' => paymentAttemptsToday(),               'category' => 'revenue'],
    ['metric' => 'payment_success',  'value' => paymentsPaidToday(), 'unit' => 'EUR',  'category' => 'revenue'],
    ['metric' => 'feedback',      'value' => feedbackToday(),                          'category' => 'feedback'],
    ['metric' => 'profiles_to_delete', 'kind' => 'gauge', 'value' => deletionQueue(),
        'category' => 'moderation', 'good_dir' => 'down', 'attention' => true],
]];
$ch = curl_init('https://astrina.io/endpoint/ingest');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['X-Astrina-Key: YOUR_SITE_KEY', 'Content-Type: application/json'],
    CURLOPT_POSTFIELDS => json_encode($payload),
    CURLOPT_RETURNTRANSFER => true,
]);
$resp = json_decode(curl_exec($ch), true);
// Two-way: act on anything Astrina asks for (e.g. a fresh full snapshot).
foreach ($resp['requests'] ?? [] as $cmd) {
    if ($cmd['cmd'] === 'full_snapshot') { /* push your whole history, then: */ }
    // acknowledge so it is not re-sent:
    // curl https://astrina.io/endpoint/ack  -d '{"id": ' . $cmd['id'] . '}'
}

<?php
// One-off: backfill a year of daily registrations so the charts start full.
$signals = [];
foreach (registrationsByDay('-365 days') as $day => $n) {   // 'YYYY-MM-DD' => int
    $signals[] = ['metric' => 'registrations', 'value' => $n, 'day' => $day, 'category' => 'users'];
}
// up to 2000 points per request
foreach (array_chunk($signals, 2000) as $chunk) {
    postJson('https://astrina.io/endpoint/ingest', ['signals' => $chunk], 'YOUR_SITE_KEY');
}

# Pull this site's computed health BACK (current values, 30-day deltas, target
# progress, open alerts, and the median across YOUR OTHER sites) to show it in-app:
curl "https://astrina.io/endpoint/insights" -H "X-Astrina-Key: YOUR_SITE_KEY"