Tag blog posts and sign them with a member

Tags are named in every language and made from the page form; the byline is
the member who signs a post on the site. The public API sends both, filters
posts by tag and lists the tags in use.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/migrations/2026_10_01_130000_add_tags_and_bylines_to_pages.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * For the blog: tags to group posts by subject, and a byline — the member who
+ * signs a post, which is not always the account that typed it in.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('tags', function (Blueprint $table): void {
+            $table->id();
+            $table->jsonb('name');
+            $table->jsonb('slug');
+            $table->timestamps();
+        });
+
+        Schema::create('page_tag', function (Blueprint $table): void {
+            $table->foreignId('page_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('tag_id')->constrained()->cascadeOnDelete();
+            $table->primary(['page_id', 'tag_id']);
+        });
+
+        Schema::table('pages', function (Blueprint $table): void {
+            $table->foreignId('byline_member_id')->nullable()->after('author_id')->constrained('members')->nullOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('pages', function (Blueprint $table): void {
+            $table->dropConstrainedForeignId('byline_member_id');
+        });
+
+        Schema::dropIfExists('page_tag');
+        Schema::dropIfExists('tags');
+    }
+};