multi-tenant relay und card-push to user

relay/inc/tenants.php

@@ -0,0 +1,24 @@
+<?php
+// Tenant DB lookup helpers.
+
+if (!defined('RELAY_BOOTSTRAPPED')) { http_response_code(404); exit; }
+
+function getTenantById(PDO $db, int $id): ?array {
+    $stmt = $db->prepare('SELECT * FROM tenants WHERE id = :id');
+    $stmt->execute(['id' => $id]);
+    return $stmt->fetch() ?: null;
+}
+
+function getTenantByUsername(PDO $db, string $username): ?array {
+    $stmt = $db->prepare('SELECT * FROM tenants WHERE username = :u');
+    $stmt->execute(['u' => $username]);
+    return $stmt->fetch() ?: null;
+}
+
+function tenantCount(PDO $db): int {
+    return (int)$db->query('SELECT COUNT(*) FROM tenants')->fetchColumn();
+}
+
+function adminCount(PDO $db): int {
+    return (int)$db->query('SELECT COUNT(*) FROM tenants WHERE is_admin = 1')->fetchColumn();
+}