# Data Dictionary - Commitments of Traders (COT) Historical Archive - aligned Parquet

**Units:** vary by `metric` - read the per-row `unit` column (overall: contracts).  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Market & exchange name |
| `ts` | timestamp (UTC) | Report week |
| `metric` | str | Position metric |
| `contracts` | float | Contracts |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (weekly = 10080) |

*Source: U.S. Commodity Futures Trading Commission (CFTC).*