php spark make:migration create_categories_table

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateCategoriesTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type'           => 'INT',
                'constraint'     => 11,
                'unsigned'       => true,
                'auto_increment' => true
            ],
            'name' => [
                'type'       => 'VARCHAR',
                'constraint' => '255',
            ],
            'svg' => [
                'type' => 'TEXT',
            ],
            'created_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ],
            'updated_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ]
        ]);
        $this->forge->addKey('id', true);
        $this->forge->createTable('categories');
    }

    public function down()
    {
        $this->forge->dropTable('categories');
    }
}

php spark make:migration create_etiquetas_table

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateEtiquetasTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type'           => 'INT',
                'constraint'     => 11,
                'unsigned'       => true,
                'auto_increment' => true
            ],
            'name' => [
                'type'       => 'VARCHAR',
                'constraint' => '255',
            ],
            'svg' => [
                'type' => 'TEXT',
            ],
            'created_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ],
            'updated_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ]
        ]);
        $this->forge->addKey('id', true);
        $this->forge->createTable('etiquetas');
    }

    public function down()
    {
        $this->forge->dropTable('etiquetas');
    }
}

php spark make:migration create_post_etiquetas_table

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreatePostEtiquetasTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'post_id' => [
                'type'       => 'INT',
                'constraint' => 11,
                'unsigned'   => true,
            ],
            'etiqueta_id' => [
                'type'       => 'INT',
                'constraint' => 11,
                'unsigned'   => true,
            ],
            'created_at' => [
                'type'    => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ],
            'updated_at' => [
                'type'    => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ]
        ]);

        $this->forge->addKey('post_id', true);
        $this->forge->addKey('etiqueta_id', true);

        // Claves Foráneas
        $this->forge->addForeignKey('post_id', 'posts', 'id', 'CASCADE', 'CASCADE');
        $this->forge->addForeignKey('etiqueta_id', 'etiquetas', 'id', 'CASCADE', 'CASCADE');

        $this->forge->createTable('post_etiquetas');
    }

    public function down()
    {
        $this->forge->dropTable('post_etiquetas');
    }
}

php spark make:migration create_posts_table

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreatePostsTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type'           => 'INT',
                'constraint'     => 11,
                'unsigned'       => true,
                'auto_increment' => true
            ],
            'title' => [
                'type'       => 'VARCHAR',
                'constraint' => '255',
            ],
            'category_id' => [
                'type'       => 'INT',
                'constraint' => 11,
                'unsigned'   => true,
            ],
            // ... otras columnas ...
            'created_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ],
            'updated_at' => [
                'type' => 'TIMESTAMP',
                'default' => 'current_timestamp()',
            ]
        ]);
        $this->forge->addKey('id', true);
        $this->forge->addForeignKey('category_id', 'categories', 'id', 'CASCADE', 'CASCADE');
        $this->forge->createTable('posts');
    }

    public function down()
    {
        $this->forge->dropTable('posts');
    }
}

  i finalment:

php spark migrate