In the mystical realm of code, the Wishmaster embarked on another adventurous quest to enhance the tapestry of their blog, "The Wishmaster's Codex." With a flick of the wand and a flicker of the keyboard, the Wishmaster sought to weave a more intricate and secure narrative, ensuring that only those worthy of wielding the power of post creation and deletion could do so. Recognizing the need for a more structured approach to user management, the Wishmaster conjured the Role and User tables, crafting a more resilient foundation for their enchanted web application. They meticulously defined a Role model, breathing life into roles like "admin" and "guest," ensuring that each user would possess a specific title, much like a character in a grand epic.

The Wishmaster then enriched the User model, linking it to the Role table, thus establishing a magical relationship that granted each user their rightful place in the realm. With properties like is_admin, the Wishmaster could easily determine who held the keys to the kingdom. With the models defined, the Wishmaster prepared a ritual to populate the database with essential roles and an admin user, chanting incantations to create default roles and summoning the admin and guest from the void, ensuring that their powers were set in stone for future encounters.

However, as they invoked db.create_all(), conjuring the tables into existence, a flicker of concern arose when they realized the tables did not appear as expected. Undeterred, the Wishmaster delved into the depths of the SQLite shell, checking for the existence of their newly forged tables, only to discover they needed to reset their database due to prior errors. With the tables now standing proudly in the database, the Wishmaster turned their attention to the art of deletion, crafting the delete_post route with checks to ensure that only those who had proven their worth—specifically, those with the is_admin attribute—could wield the power to delete posts. They balanced the need for authority and security, ensuring that the delicate fabric of the blog remained intact from the hands of those unworthy.

In a twist of fate, the Wishmaster received a message by carrier owl regarding warnings from pytest—an ominous note that stirred concern despite the test cases passing successfully. This cryptic message prompted the Wishmaster to embark on a deeper journey into the arcane arts of SQLAlchemy. They uncovered the ancient knowledge that transformed their spells from using Query.get to the more potent Session.get. This required unraveling already written spells and deftly weaving them together using the secret knowledge contained in the depths of SQLAlchemy's documentation. With patience and persistence, the Wishmaster mastered the new incantations, ensuring the stability and future-proofing of their code.

In the enchanted realm of HTML, the Wishmaster adorned the navigation bar with a "Create Post" button, visible only to the admins, allowing them to forge new entries into the codex with ease. They also took a moment to enhance the login page, crafting a visually harmonious design that echoed the whimsical theme of the blog, complete with a "Return to Home" button for easy navigation.

Through this day's endeavors, the Wishmaster learned that with every spell cast—each line of code written—there is the potential for both magic and mischief. The balance of power and responsibility in user roles is crucial in the ever-evolving landscape of their web application. With each feature added, the Wishmaster moved closer to creating a rich, interactive experience for all who would visit "The Wishmaster's Codex." And so, with the journey continuing, the Wishmaster prepared for the next leg of their quest, ready to explore new realms of functionality and design, weaving ever more complex spells in the world of coding magic.