fix: extract country and userAgent from tags into dedicated columns

Use Metric::EVENT_COLUMNS to extract all event columns from tags
instead of hardcoding the list. Now country and userAgent are properly
stored in dedicated columns instead of being left in tags JSON.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: lohanidamodar

src/Usage/Adapter/ClickHouse.php

@@ -1335,48 +1335,27 @@ public function addBatch(array $metrics, string $type = Usage::TYPE_EVENT, int $
                 $tenant = $this->sharedTables ? $this->resolveTenantFromMetric($metricData) : null;
 
                 if ($type === Usage::TYPE_EVENT) {
-                    // Extract event-specific columns from tags
-                    $path = null;
-                    $method = null;
-                    $status = null;
-                    $resource = null;
-                    $resourceId = null;
-
-                    if (isset($tags['path'])) {
-                        $path = (string) $tags['path'];
-                        unset($tags['path']);
-                    }
-                    if (isset($tags['method'])) {
-                        $method = (string) $tags['method'];
-                        unset($tags['method']);
-                    }
-                    if (isset($tags['status'])) {
-                        $status = (string) $tags['status'];
-                        unset($tags['status']);
-                    }
-                    if (isset($tags['resource'])) {
-                        $resource = (string) $tags['resource'];
-                        unset($tags['resource']);
-                    }
-                    if (isset($tags['resourceId'])) {
-                        $resourceId = (string) $tags['resourceId'];
-                        unset($tags['resourceId']);
+                    // Extract event-specific columns from tags into dedicated columns
+                    $eventColumns = [];
+                    foreach (Metric::EVENT_COLUMNS as $col) {
+                        if (isset($tags[$col])) {
+                            $eventColumns[$col] = (string) $tags[$col];
+                            unset($tags[$col]);
+                        } else {
+                            $eventColumns[$col] = null;
+                        }
                     }
 
                     ksort($tags);
 
-                    $row = [
+                    $row = array_merge([
                         'id' => $this->generateId(),
                         'metric' => $metric,
                         'value' => $value,
                         'time' => $this->formatDateTime(null),
-                        'path' => $path,
-                        'method' => $method,
-                        'status' => $status,
-                        'resource' => $resource,
-                        'resourceId' => $resourceId,
+                    ], $eventColumns, [
                         'tags' => $tags,
-                    ];
+                    ]);
                 } else {
                     // Gauge: simple schema
                     ksort($tags);