Refresh dataset card and static metadata

README.md

@@ -41,6 +41,14 @@ configs:
 
 Free, daily-updated perpetuals market data intended for quant research, backtesting, and market microstructure analysis.
 
+## Current Scope
+
+- **Coverage:** Hyperliquid chain/archive-derived perp rows published as partitioned Parquet.
+- **Datasets:** funding, trades, markets, open interest, and liquidations.
+- **Cadence:** append-only daily partitions from the Chainticks Hetzner sink.
+- **Timestamps:** UTC ISO-8601 strings. Missing values are Arrow nulls.
+- **Best for:** agent-readable market context, strategy replay, feature engineering, and public benchmark slices.
+
 ```python
 import pandas as pd
 
@@ -51,13 +59,13 @@ trades = pd.read_parquet(URL.format(DATE=DATE))  # first shard; see _manifest.js
 print(trades.head())
 ```
 
-This repository is initialized for **chain-derived perp DEX data**, starting with Hyperliquid. The public dataset must only contain records whose provenance is public chain/archive state, not venue REST API resale. The first production feed publishes Hyperliquid funding, trades, markets, open interest, and liquidations as partitioned Parquet under an explicit `hyperliquid_chain/` provider partition.
+This repository is for **chain-derived perp DEX data**, starting with Hyperliquid. The public dataset must only contain records whose provenance is public chain/archive state, not venue REST API resale. The first production feed publishes Hyperliquid funding, trades, markets, open interest, and liquidations as partitioned Parquet under an explicit `hyperliquid_chain/` provider partition.
 
 ## Status
 
-Initialized. Data publication starts after the Hetzner chain-derived `hyperliquid_chain` sink is live.
+Live. Read `LATEST_DATE.txt` for the newest published UTC partition, and `_manifest.json` for available files, row counts, and time ranges.
 
-## Planned Layout
+## Layout
 
 ```text
 hyperliquid_chain/
@@ -118,6 +126,10 @@ Eligible public rows use one of these `source_kind` values:
 
 API-sourced internal research rows are intentionally excluded from this public dataset.
 
+## Known Limitations
+
+This is public-source market data for research and analytics. It is not a trading API, and it should not be treated as complete venue truth without checking the manifest, data freshness, and source provenance for the partition being used. Large trade dates may be sharded across many `part-*.parquet` files.
+
 ## Agent Prompt Snippet
 
 ```text