List alternative-data tables under the given categories. Returns each table's name,
one-line purpose, and column names (call get_table_schema if you need column
types/comments). Batch up to 5 categories in one call.
Use this BEFORE run_sql when you want to explore alt-data — run_sql alone won't
tell you which tables exist.
Available categories:
- Energy & Power — US power plants, electricity prices, regional hourly generation/demand
- Data Centers — facilities, GPU clusters, cooling
- Semiconductors — AI chip specs, sales, ownership, foundry revenue, customs trade
- Compute Pricing — GPU rental, cloud VM spot/on-demand, instance specs
- Model Development — model specs, benchmarks, AI companies, AI polling, LLM arena
- Inference Economics — LLM API pricing across providers
- Macro & Trade — UN Comtrade, US Census trade flows, FRED macro series
- Prediction Markets — Polymarket and Kalshi events, markets, trades, daily aggregates
- Critical Minerals — USGS mineral deposits, country supply, critical materials
