Features/analytic views and table

[lpi-tn]

This pull request introduces new historical tracking tables and corresponding models for document counts, adds a new read-only view and model for tracking feature usage per session, and provides comprehensive tests for the new models. It also includes a minor docstring correction.

Database schema and model changes:

• Added three new tables via Alembic migration for tracking historical document counts: historical_qty_document_per_corpus, historical_qty_document_in_qdrant_per_corpus, and historical_qty_document_in_qdrant in the document_related schema. Corresponding SQLAlchemy models were created in document_related.py. [1] [2]
• Added a new Alembic migration to create a SQL view grafana.used_feature_per_session for analyzing feature usage by session.
• Introduced a new read-only SQLAlchemy model UsedFeaturePerSession in grafana.py to map the new view.

Testing:

• Added tests for the new historical document count models to ensure correct creation and retrieval in the database. [1] [2]

Documentation:

• Fixed a minor typo in the docstring for the WeLearnDocument model (exist → exists).

[Copilot]

Pull request overview

This PR adds new persistence and analytics structures to support tracking document-count history and session-level feature usage in the WeLearn database layer.

Changes:

• Adds three new “historical quantity” tables (and SQLAlchemy models) for document count snapshots.
• Adds a new Grafana schema view + read-only SQLAlchemy model to report per-session feature usage.
• Extends unit tests for the new historical models and fixes a small docstring typo.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
welearn_database/data/models/grafana.py	Adds UsedFeaturePerSession read-only model mapping to the new Grafana view.
welearn_database/data/models/document_related.py	Fixes docstring typo; introduces 3 new historical quantity models.
welearn_database/alembic/versions/5aad97149044_add_histo_table_for_materialized_views.py	Creates the 3 new historical quantity tables.
welearn_database/alembic/versions/6d4346fad6f4_view_used_feature_per_session.py	Creates/drops the new grafana.used_feature_per_session view.
tests/test_document_related.py	Adds tests for the new historical quantity models.

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