fix: preserve datetime instants in visibility query bindings

Author: rmcdaniel

app/Support/WorkflowVisibilityQuery.php

@@ -6,6 +6,7 @@
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Support\Carbon;
 use Illuminate\Validation\ValidationException;
+use Workflow\V2\Support\UtcScheduleTimestamp;
 
 class WorkflowVisibilityQuery
 {
@@ -744,15 +745,15 @@ private function coerceBool(mixed $literal, string $field): bool
         throw $this->invalidValue($field, 'a boolean literal');
     }
 
-    private function coerceDatetime(mixed $literal, string $field): Carbon
+    private function coerceDatetime(mixed $literal, string $field): string
     {
         if ($literal instanceof \DateTimeInterface) {
-            return Carbon::instance($literal);
+            return UtcScheduleTimestamp::databaseValue($literal);
         }
 
         if (is_string($literal) || is_int($literal) || is_float($literal)) {
             try {
-                return Carbon::parse($literal);
+                return UtcScheduleTimestamp::databaseValue(Carbon::parse($literal));
             } catch (\Throwable) {
                 throw $this->invalidValue($field, 'a datetime literal');
             }

tests/Feature/WorkflowSearchAttributeVisibilityQueryTest.php

@@ -234,7 +234,7 @@ public function test_datetime_visibility_preserves_offset_instants_and_microseco
         $this->assertSame(['wf-date-match'], $this->workflowIdsForQuery('occurred_at = "'.$literal.'"'));
         $this->assertSame(['wf-date-neighbor'], $this->workflowIdsForQuery('occurred_at != "'.$literal.'"'));
         $this->assertSame(['wf-date-match'], $this->workflowIdsForQuery('occurred_at IN ("'.$literal.'")'));
-        $this->assertSame(['wf-date-neighbor'], $this->workflowIdsForQuery('occurred_at NOT IN ("'.$literal.'")'));
+        $this->assertSame(['wf-date-neighbor'], $this->workflowIdsForQuery('NOT occurred_at IN ("'.$literal.'")'));
         $this->assertSame(['wf-date-match'], $this->workflowIdsForQuery(
             'occurred_at >= "'.$literal.'" AND occurred_at < "2026-10-08T10:34:56.123457Z"',
         ));