Fix period validation and SummingMergeTree ORDER BY key

- Fix validatePeriod() using isset() which returns false for null values;
  use array_key_exists() instead so 'inf' period is accepted correctly
- Include all dimension columns (region, resource, resourceId, path, method,
  status) in events table ORDER BY key so SummingMergeTree preserves distinct
  dimension values instead of collapsing rows with different dimensions

https://claude.ai/code/session_01UCN4sKD3Zkdbimn3QgTHSB

Author: claude

src/Usage/Adapter/ClickHouse.php

@@ -13,7 +13,7 @@
  *
  * 1. **events** (SummingMergeTree) – append-only API analytics & metered usage.
  *    Columns: timestamp, metric, value, projectId, region, path, method, status, userAgent, resource, resourceId, tags, tenant.
- *    ORDER BY (tenant, projectId, metric, timestamp) for fast range scans.
+ *    ORDER BY (tenant, projectId, metric, region, resource, ..., timestamp) for fast range scans.
  *    Hourly and daily rollups via SummingMergeTree time-bucket grouping.
  *
  * 2. **gauges** (ReplacingMergeTree) – point-in-time resource counts.
@@ -130,7 +130,9 @@ public function setup(): void
         // Events table (SummingMergeTree – value column is summed on merge)
         $eventsTable = $this->eventsTable();
         $tenantCol = $this->sharedTables ? "tenant Nullable(UInt64),\n                " : '';
-        $orderKey = $this->sharedTables ? '(tenant, projectId, metric, timestamp)' : '(projectId, metric, timestamp)';
+        $orderKey = $this->sharedTables
+            ? '(tenant, projectId, metric, region, resource, resourceId, path, method, status, timestamp)'
+            : '(projectId, metric, region, resource, resourceId, path, method, status, timestamp)';
 
         $this->query("
             CREATE TABLE IF NOT EXISTS {$eventsTable} (
@@ -870,7 +872,7 @@ private function validateHost(string $host): void
 
     private function validatePeriod(string $period): void
     {
-        if (!isset(self::PERIODS[$period])) {
+        if (!array_key_exists($period, self::PERIODS)) {
             throw new \InvalidArgumentException("Invalid period '{$period}'. Allowed: " . implode(', ', array_keys(self::PERIODS)));
         }
     }