Update README: combined file structure + daily updater docs

README.md

@@ -16,55 +16,81 @@ size_categories:
 
 # 1-Second Crypto OHLCV Data (Binance)
 
-Historical 1-second kline (candlestick) data for 6 major cryptocurrencies
+Historical 1-second kline (OHLCV) data for 6 major cryptocurrencies
 downloaded from [Binance Vision](https://data.binance.vision/).
+Updated daily — never more than 24h behind.
 
 ## Assets
 
-| Symbol   | Start      | End        |
+| Symbol   | Start      | Updated    |
 |----------|------------|------------|
-| BTCUSDT  | 2019-01    | 2026-03    |
-| ETHUSDT  | 2019-01    | 2026-03    |
-| BNBUSDT  | 2019-01    | 2026-03    |
-| XRPUSDT  | 2019-01    | 2026-03    |
-| DOGEUSDT | 2019-07    | 2026-03    |
-| SOLUSDT  | 2020-10    | 2026-03    |
-
-## Schema
-
-| Column       | Type    | Description                      |
-|--------------|---------|----------------------------------|
-| open_time_s  | int64   | Unix timestamp in **seconds**    |
-| open         | float64 | 1-second open price              |
-| high         | float64 | 1-second high price              |
-| low          | float64 | 1-second low price               |
-| close        | float64 | 1-second close price             |
-| volume       | float64 | Base asset volume                |
+| BTCUSDT  | 2019-01    | daily      |
+| ETHUSDT  | 2019-01    | daily      |
+| BNBUSDT  | 2019-01    | daily      |
+| XRPUSDT  | 2019-01    | daily      |
+| DOGEUSDT | 2019-07    | daily      |
+| SOLUSDT  | 2020-10    | daily      |
 
 ## File Structure
 
 ```
-data/{SYMBOL}/{SYMBOL}_{YEAR}.parquet
+data/{SYMBOL}_1s.parquet        ← full history, one file per asset
+scripts/daily_update.py         ← run to append latest daily data
 ```
 
-Each file is one calendar year for one asset, Snappy-compressed Parquet.
+## Schema
+
+| Column       | Type    | Description                   |
+|--------------|---------|-------------------------------|
+| open_time_s  | int64   | Unix timestamp in **seconds** |
+| open         | float64 | 1-second open price           |
+| high         | float64 | 1-second high price           |
+| low          | float64 | 1-second low price            |
+| close        | float64 | 1-second close price          |
+| volume       | float64 | Base asset volume             |
 
 ## Usage
 
 ```python
 import pandas as pd
 
-# Load one asset, one year
+# Load one asset (full history, ~200M rows for BTC)
 df = pd.read_parquet(
-    "hf://datasets/commanderzee/1s-crypto-data/data/BTCUSDT/BTCUSDT_2024.parquet"
+    "hf://datasets/commanderzee/1s-crypto-data/data/BTCUSDT_1s.parquet"
 )
 
-# Load all years for one asset
-from datasets import load_dataset
-ds = load_dataset("commanderzee/1s-crypto-data", data_files="data/BTCUSDT/*.parquet")
+# Load all assets
+SYMBOLS = ["BTCUSDT","ETHUSDT","BNBUSDT","XRPUSDT","DOGEUSDT","SOLUSDT"]
+frames = {
+    sym: pd.read_parquet(
+        f"hf://datasets/commanderzee/1s-crypto-data/data/{sym}_1s.parquet"
+    )
+    for sym in SYMBOLS
+}
+```
+
+## Daily Auto-Update
+
+The `scripts/daily_update.py` checks the latest timestamp in each asset's
+Parquet, downloads any missing days from Binance Vision's
+[daily 1s endpoint](https://data.binance.vision/?prefix=data/spot/daily/klines/),
+appends new rows, and re-uploads.
+
+```bash
+# Run manually (requires HF_TOKEN with write access):
+HF_TOKEN=<your_token> python scripts/daily_update.py
+
+# Dry-run (shows what would be fetched, no upload):
+HF_TOKEN=<your_token> python scripts/daily_update.py --dry-run
+
+# Update specific symbols only:
+HF_TOKEN=<your_token> python scripts/daily_update.py --symbols BTCUSDT ETHUSDT
 ```
 
+Binance publishes daily files roughly 2–4h after UTC midnight.
+
 ## Source
 
-All data sourced from [Binance Vision](https://data.binance.vision/) public archives.
-Timestamps normalised to Unix seconds (integer division of raw ms/μs timestamps).
+All data from [Binance Vision](https://data.binance.vision/) public archives.
+Timestamps normalised to Unix seconds (integer division from raw ms/μs timestamps).
+Duplicate bars removed; rows sorted ascending by `open_time_s`.