Allow multiple template versions: replace unique(slug) with unique(slug,version) + versioning test

database/migrations/2025_10_06_180000_alter_document_templates_slug_unique.php

@@ -0,0 +1,44 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('document_templates', function (Blueprint $table) {
+            // Drop original unique index on slug if it exists, then add composite unique (slug, version)
+            try {
+                $table->dropUnique('document_templates_slug_unique');
+            } catch (Throwable $e) {
+                // Ignore if already dropped / not present (SQLite memory or prior manual change)
+            }
+            // Add composite unique to allow multiple versions per slug while preventing duplicate version numbers
+            $table->unique(['slug', 'version'], 'document_templates_slug_version_unique');
+            // Optional plain index on slug alone (not unique) to speed lookups by slug
+            $table->index('slug', 'document_templates_slug_index');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('document_templates', function (Blueprint $table) {
+            // Drop composite + plain indices
+            try {
+                $table->dropIndex('document_templates_slug_index');
+            } catch (Throwable $e) {
+            }
+            try {
+                $table->dropUnique('document_templates_slug_version_unique');
+            } catch (Throwable $e) {
+            }
+            // Restore original simple unique on slug
+            try {
+                $table->unique('slug', 'document_templates_slug_unique');
+            } catch (Throwable $e) {
+            }
+        });
+    }
+};