Historical data storage strategy

[kvkenyon]

Implements a client-side data warehousing strategy for historical ERCOT data using S3/Parquet and DuckDB.

This strategy provides a cost-effective and unified way to offer a "pre-built historical database" for tinygrid, directly competing with commercial offerings like Grid Status without incurring the high costs of a dedicated database server. It offloads query compute to the client and leverages cheap object storage.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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