# Data Dictionary - US Liquidity & Market Plumbing - net liquidity, drivers, stress & fails, daily Parquet

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

| column | type | description |
|---|---|---|
| `zone` | str | US |
| `ts` | timestamp (UTC) | Day |
| `metric` | str | Net liquidity, Fed balance sheet, Reverse Repo, TGA, yields, 2s10s, fails, bid-to-cover, stress composites |
| `value` | float | Metric value (unit varies) |
| `unit` | str | unit |
| `res_min` | int | Native resolution (daily = 1440) |

**Caveats:** FTD series are stamped by SEC settlement date, published semi-monthly ~2-4 weeks in arrears - shift FTD-derived columns by the publication lag in any backtest (look-ahead bias otherwise).

*Source: U.S. Department of the Treasury (Fiscal Data) & Federal Reserve Bank of New York.*