refactor(form-builder): strict validator on save; strip rules.unique fallback

api/app/Services/FormBuilder/FormFieldService.php

@@ -38,6 +38,7 @@ final class FormFieldService
         $data['sort_order'] ??= $this->nextSortOrder($schema);
 
         $bindingSpec = $this->extractBindingSpec($data);
+        $validationRuleSpecs = $this->extractValidationRuleSpecs($data);
 
         $this->assertNoConditionalCycle($schema, null, $data['conditional_logic'] ?? null, $data['slug'] ?? null);
 
@@ -48,6 +49,10 @@ final class FormFieldService
             $this->bindingService->replaceBindings($field, [$bindingSpec]);
         }
 
+        if ($validationRuleSpecs !== null) {
+            $this->validationRuleService->replaceRules($field, $validationRuleSpecs);
+        }
+
         $this->schemaService->bumpVersion($schema);
         $field->logFieldChange('field.created');
 
@@ -67,6 +72,9 @@ final class FormFieldService
         $rawBinding = $bindingProvided ? $data['binding'] : null;
         $bindingSpec = $bindingProvided ? $this->extractBindingSpec($data) : null;
 
+        $validationRulesProvided = array_key_exists('validation_rules', $data);
+        $validationRuleSpecs = $validationRulesProvided ? $this->extractValidationRuleSpecs($data) : null;
+
         $currentBindingShape = $this->bindingService->toJsonShape($field->bindings()->first());
 
         if ($bindingProvided && $this->bindingChanged($currentBindingShape, $rawBinding)) {
@@ -91,6 +99,10 @@ final class FormFieldService
             $this->bindingService->replaceBindings($field, $bindingSpec === null ? [] : [$bindingSpec]);
         }
 
+        if ($validationRulesProvided) {
+            $this->validationRuleService->replaceRules($field, $validationRuleSpecs ?? []);
+        }
+
         $this->schemaService->bumpVersion($schema);
 
         $field->logFieldChange('field.updated', [
@@ -110,6 +122,36 @@ final class FormFieldService
         return $field->refresh();
     }
 
+    /**
+     * Extract the `validation_rules` key from the request data array and
+     * return it as the service-layer spec list. The JSON column is no
+     * longer written (WS-5b commit 3) — writes go through
+     * `FormFieldValidationRuleService::replaceRules` after the FormField
+     * row is created/updated.
+     *
+     * Returns `null` when the key was absent (no change requested), or an
+     * empty list when the caller explicitly cleared rules. Callers
+     * distinguish via `array_key_exists('validation_rules', $data)`
+     * BEFORE invoking this helper.
+     *
+     * @param  array<string, mixed>  $data
+     * @return list<array<string, mixed>>|null
+     */
+    private function extractValidationRuleSpecs(array &$data): ?array
+    {
+        if (! array_key_exists('validation_rules', $data)) {
+            return null;
+        }
+        $raw = $data['validation_rules'];
+        unset($data['validation_rules']);
+        if (! is_array($raw)) {
+            return [];
+        }
+
+        /** @var list<array<string, mixed>> $raw */
+        return array_values($raw);
+    }
+
     /**
      * @param  array<string, mixed>  $data
      * @return array{target_entity:string,target_attribute:string,mode:string,sync_direction?:?string}|null