Implement Efficient Data Partitioning and Indexing

Use data partitioning, indexing, and caching strategies to improve query performance and reduce the time required to retrieve large datasets.

Stories:
- [ ] #41

No files, tests, datasets, or entry points are named. Start by surveying the repository for query configuration and existing partitioning, indexing, or caching settings, then identify the large datasets and performance measurements involved. Done should mean the agreed retrieval-time improvement is demonstrated without breaking existing data access.

Written by the indexing model from the issue text.