SetUp PostgreSQL with SQLAlchemy and Alembic

[kevinrawal]

Description

Set up a PostgreSQL database with SQLAlchemy ORM and Alembic for database migrations, including initial schema for users and challenges.

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Tasks

• Configure PostgreSQL database connection
• Set up SQLAlchemy with async support
• Configure Alembic for database migrations
• Set up database session management
• Add database seeding for development
• Implement connection pooling
• Add database health check