PostgreSQL Integration and Database Migrations

[Ritika-Bitcot]

Description:

As a developer, I want to integrate PostgreSQL with SQLAlchemy ORM and manage schema changes using Alembic so that data is stored reliably with relationships, and schema updates are version-controlled and consistent across environments.

Acceptance Criteria:

Database Integration

1. PostgreSQL configured and connected using SQLAlchemy ORM.
2. Users and tasks stored in PostgreSQL with proper relationship mapping (one-to-many between user and tasks).

Migrations with Alembic

1. Alembic migration setup is in place.
2. Ability to generate new migration scripts for schema changes.
3. Support for applying and rolling back migrations consistently across environments.