refactor(form-builder): pre-publish check reads form_field_bindings; drop binding JSON columns

api/database/factories/FormBuilder/FormFieldFactory.php

@@ -53,7 +53,6 @@ final class FormFieldFactory extends Factory
             'is_unique' => false,
             'is_pii' => false,
             'display_width' => FormFieldDisplayWidth::FULL,
-            'binding' => null,
             'conditional_logic' => null,
             'role_restrictions' => null,
             'translations' => null,

api/database/factories/FormBuilder/FormFieldLibraryFactory.php

@@ -36,7 +36,6 @@ final class FormFieldLibraryFactory extends Factory
             'validation_rules' => null,
             'default_is_required' => false,
             'default_is_filterable' => false,
-            'default_binding' => null,
             'translations' => null,
             'description' => fake('nl_NL')->sentence(),
             'is_active' => true,

api/database/migrations/2026_04_25_100001_drop_binding_json_columns.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * WS-5a commit 3 of 4 — drops the legacy `form_fields.binding` and
+ * `form_field_library.default_binding` JSON columns now that every reader
+ * (pre-publish check, snapshot writer, API resources, mirror writer, field
+ * CRUD path, and library CRUD path) has been switched to the relational
+ * `form_field_bindings` table.
+ *
+ * Rollback re-adds both columns as nullable JSON but does NOT attempt to
+ * backfill. The full rollback path for WS-5a as a whole is to first roll
+ * back the table-creation migration (`2026_04_25_100000_create_form_field_bindings_table`),
+ * which genuinely reconstructs the JSON. Rolling back *only* this
+ * column-drop migration leaves the JSON columns empty on purpose —
+ * callers that need the old JSON state must roll back both steps.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (Schema::hasColumn('form_fields', 'binding')) {
+            Schema::table('form_fields', function (Blueprint $table): void {
+                $table->dropColumn('binding');
+            });
+        }
+
+        if (Schema::hasColumn('form_field_library', 'default_binding')) {
+            Schema::table('form_field_library', function (Blueprint $table): void {
+                $table->dropColumn('default_binding');
+            });
+        }
+    }
+
+    public function down(): void
+    {
+        if (! Schema::hasColumn('form_fields', 'binding')) {
+            Schema::table('form_fields', function (Blueprint $table): void {
+                $table->json('binding')->nullable()->after('display_width');
+            });
+        }
+
+        if (! Schema::hasColumn('form_field_library', 'default_binding')) {
+            Schema::table('form_field_library', function (Blueprint $table): void {
+                $table->json('default_binding')->nullable()->after('default_is_filterable');
+            });
+        }
+    }
+};

api/database/seeders/FormBuilderDevSeeder.php

@@ -99,7 +99,7 @@ final class FormBuilderDevSeeder
                     'is_required' => $field['is_required'] ?? false,
                     'is_filterable' => $field['is_filterable'] ?? false,
                     'is_pii' => $field['is_pii'] ?? false,
-                    'binding' => null,
+                    'binding' => null, // Pattern B — snapshot embeds null for form-owned fields.
                     'conditional_logic' => null,
                     'translations' => null,
                     'value_storage_hint' => $field['type']->recommendedValueStorageHint()->value,
@@ -372,7 +372,6 @@ final class FormBuilderDevSeeder
                 'is_admin_only' => false,
                 'is_pii' => false,
                 'display_width' => $def['display_width'] ?? 'full',
-                'binding' => null,
                 'role_restrictions' => null,
                 'value_storage_hint' => $def['value_storage_hint'] ?? FormValueStorageHint::JSON,
                 'sort_order' => $sortOrder + 1,