Molecular Data Pipeline with Eloquent ORM Optimization

Design a high-performance Laravel data pipeline for processing large-scale genomic sequencing results. Create an Eloquent model for genomic variants that can handle batch insertions of over 500,000 records with minimal memory overhead. Implement a custom database migration strategy that supports versioning of genetic data schemas, including handling nullable complex JSON fields for variant annotations. Include performance benchmarking methods to ensure sub-second query response times on datasets exceeding 10 million records.