🔥 Add initial database migrations, seeders, and factories

🎨 Refactor `Lecturer` model to include new fields and factory usage
🔧 Update `DatabaseSeeder` to handle default seeds
🛠️ Enhance `einundzwanzig` database configuration for SQLite compatibility

database/migrations/2026_05_02_155301_create_countries_table.php

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+<?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::create('countries', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('code', 8)->unique();
+            $table->json('language_codes')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('countries');
+    }
+};

database/migrations/2026_05_02_155302_create_cities_table.php

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+<?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::create('cities', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('country_id')->constrained()->cascadeOnDelete();
+            $table->string('name');
+            $table->string('slug')->nullable()->index();
+            $table->decimal('latitude', 10, 7)->nullable();
+            $table->decimal('longitude', 10, 7)->nullable();
+            $table->json('osm_relation')->nullable();
+            $table->json('simplified_geojson')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('cities');
+    }
+};

database/migrations/2026_05_02_155303_create_lecturers_table.php

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+<?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::create('lecturers', function (Blueprint $table) {
+            $table->id();
+            $table->string('name');
+            $table->string('slug')->nullable()->index();
+            $table->text('bio')->nullable();
+            $table->string('npub', 63)->nullable()->index();
+            $table->string('pubkey', 64)->nullable()->index();
+            $table->string('website')->nullable();
+            $table->boolean('active')->default(true);
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('lecturers');
+    }
+};

database/migrations/2026_05_02_155304_create_categories_table.php

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+<?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::create('categories', function (Blueprint $table) {
+            $table->id();
+            $table->string('name')->unique();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('categories');
+    }
+};

database/migrations/2026_05_02_155305_create_meetups_table.php

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+<?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::create('meetups', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('city_id')->constrained()->cascadeOnDelete();
+            $table->string('name');
+            $table->string('slug')->nullable()->index();
+            $table->text('description')->nullable();
+            $table->string('website')->nullable();
+            $table->string('nostr_pubkey', 64)->nullable();
+            $table->json('github_data')->nullable();
+            $table->json('simplified_geojson')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('meetups');
+    }
+};

database/migrations/2026_05_02_155306_create_meetup_events_table.php

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+<?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::create('meetup_events', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('meetup_id')->constrained()->cascadeOnDelete();
+            $table->timestamp('start');
+            $table->string('location')->nullable();
+            $table->text('description')->nullable();
+            $table->string('link')->nullable();
+            $table->json('attendees')->nullable();
+            $table->json('might_attendees')->nullable();
+            $table->string('nostr_status')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('meetup_events');
+    }
+};

database/migrations/2026_05_02_155307_create_venues_table.php

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+<?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::create('venues', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('city_id')->constrained()->cascadeOnDelete();
+            $table->string('name');
+            $table->string('slug')->nullable()->index();
+            $table->text('description')->nullable();
+            $table->string('address')->nullable();
+            $table->string('website')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('venues');
+    }
+};

database/migrations/2026_05_02_155308_create_courses_table.php

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+<?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::create('courses', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('lecturer_id')->nullable()->constrained()->nullOnDelete();
+            $table->string('name');
+            $table->string('slug')->nullable()->index();
+            $table->text('description')->nullable();
+            $table->unsignedInteger('duration_minutes')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('courses');
+    }
+};

database/migrations/2026_05_02_155309_create_course_events_table.php

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+<?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::create('course_events', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('course_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('venue_id')->nullable()->constrained()->nullOnDelete();
+            $table->timestamp('from');
+            $table->timestamp('to')->nullable();
+            $table->unsignedBigInteger('created_by')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('course_events');
+    }
+};

database/migrations/2026_05_02_155310_create_category_course_table.php

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+<?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::create('category_course', function (Blueprint $table) {
+            $table->foreignId('category_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('course_id')->constrained()->cascadeOnDelete();
+            $table->primary(['category_id', 'course_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('category_course');
+    }
+};

database/migrations/2026_05_02_155311_create_meetup_user_table.php

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+<?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::create('meetup_user', function (Blueprint $table) {
+            $table->foreignId('meetup_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->primary(['meetup_id', 'user_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('meetup_user');
+    }
+};