Feature/infered user tables

[lpi-tn]

This pull request introduces a new inferred user tracking system to the database schema and ORM models. The main changes add three new tables—inferred_user, session, and endpoint_request—to the user_related schema, along with corresponding SQLAlchemy models to support user session tracking and endpoint request logging.

Database schema additions:

• Added migration file alembic/versions/e354666f951d_inferred_user.py to create the inferred_user, session, and endpoint_request tables in the user_related schema. Each table includes relevant columns, primary keys, and foreign key relationships for session and request tracking.

ORM model additions:

• Added InferredUser, Session, and EndpointRequest SQLAlchemy models in welearn_datastack/data/db_models.py, mirroring the new tables and relationships defined in the migration. These models allow application code to interact with inferred users, sessions, and endpoint requests.

[Copilot]

Pull Request Overview

This PR introduces an inferred user tracking system with three new database tables (inferred_user, session, and endpoint_request) and corresponding SQLAlchemy models to support user session tracking and endpoint request logging.

• Adds database migration to create the new tracking tables in the user_related schema
• Creates SQLAlchemy ORM models for the three new entities with appropriate relationships
• Establishes foreign key relationships between sessions and inferred users, and between endpoint requests and sessions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
alembic/versions/e354666f951d_inferred_user.py	Database migration creating the three new tables with proper schema, columns, and constraints
welearn_datastack/data/db_models.py	SQLAlchemy ORM models for InferredUser, Session, and EndpointRequest with mapped columns and relationships

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}