Initial update:

Add Readme.md
add stocks from preliminary v2
add stocks from european STOXX50 Index

.gitignore

@@ -0,0 +1,27 @@
+# Exclude temporary and working files
+
+*.fetched.parquet 
+*.test.parquet 
+*.ufetch.parquet 
+*.utest.parquet 
+*.fail*.parquet 
+*.ufail*.parquet
+
+
+# Include only valid parquet files
+
+!\*.valid.parquet
+
+# Other common ignores
+
+*.log 
+*.tmp 
+*.bak 
+*.cmd 
+*config.yml
+validated_symbols.txt
+.DS_Store 
+**pycache**/ 
+*.pyc 
+.env 
+logs/

LICENSE

@@ -0,0 +1,11 @@
+Custom License - Non-Commercial Research Use Only
+
+This dataset contains historical financial time series data collected via the yfinance Python library, which retrieves public market data from Yahoo Finance.
+
+These data remain the property of their respective original sources and are provided here strictly for non-commercial research and educational purposes.
+
+Redistribution of this dataset may be limited by the terms of the original data providers.
+
+NO WARRANTY IS PROVIDED. USE AT YOUR OWN RISK.
+
+For any intended use beyond private research, please consult the terms of Yahoo Finance and other data providers.

README.md

@@ -1,3 +1,174 @@
 ---
-license: apache-2.0
+license: other
+license_name: license
+license_link: LICENSE
+tags:
+- finance
 ---
+# 🗃️ TroveLedger — Financial Time Series Dataset
+
+![TroveLedger Banner](media/Banner-TroveLedger.jpg)
+
+**A growing ledger of accumulated market history.**
+
+---
+> ### 🔔 **Latest Dataset Update**
+>
+> **Date:** 2025-12-18  
+> **New addition:** 🇪🇺 **EURO STOXX 50**
+> 
+> Today, symbols from the **EURO STOXX 50** were added to TroveLedger.  
+> This index represents **50 of the largest and most liquid companies in the European Union**, spanning multiple sectors and countries.
+> 
+> Many German constituents were already present due to earlier curation; newly added symbols seamlessly extend the existing historical data without introducing gaps.
+> 
+> 📈 **What this means:**
+> 
+> - TroveLedger now takes a **decisive step toward international coverage**
+>     
+> - High-liquidity European equities are now available with **continuously accumulated minute data**
+>     
+> 
+> 🔜 **What’s next:**  
+> Another international index will be added **on the next trading day**, continuing the gradual expansion across regions and sectors.
+
+<details>
+<summary>
+Click to expand
+</summary>
+<img src="media/STOXX50.jpg"/>
+</details>
+---
+
+## 📌 Overview
+
+**TroveLedger** is a public financial time series dataset focused on **long-term accumulation of high-quality intraday data**.
+
+The dataset provides OHLC and volume data at multiple time resolutions and is designed primarily for **machine learning, quantitative research, and systematic trading experiments**.
+
+Unlike many freely available data sources, TroveLedger emphasizes **continuity over time**, especially for minute-level data.
+
+---
+
+## 🔑 What makes TroveLedger different
+
+High-resolution intraday data is difficult to obtain from free sources over extended periods.
+
+Typical public data access (e.g. via yfinance) provides:
+
+* **Daily candles:** often spanning decades
+* **Hourly candles:** roughly one year into the past
+* **Minute candles:** usually limited to the most recent 7 days
+
+Repeatedly downloading rolling 7-day windows results in **short, fragmented histories** that are poorly suited for training models on intraday behavior.
+
+TroveLedger takes a different approach:
+
+* Minute-level data is **accumulated continuously**
+* Time series are **extended, not replaced**
+* Over time, this results in **months of gap-free minute data per instrument**
+
+This accumulated depth forms a substantially more reliable foundation for intraday research and model training.
+
+---
+
+## 📦 Dataset Contents
+
+For each instrument, the dataset will contain:
+
+* **Daily OHLC + volume**
+* **Hourly OHLC + volume**
+* **Minute OHLC + volume**
+
+All data is stored in **Parquet format** for efficient processing.
+
+```
+/data/{category}/{symbol}/{symbol}.days.{state}.parquet
+/data/{category}/{symbol}/{symbol}.hours.{state}.parquet
+/data/{category}/{symbol}/{symbol}.minutes.{state}.parquet
+```
+
+---
+
+## 🔄 Update Philosophy
+
+The primary objective is **data continuity**, not guaranteed daily updates.
+
+In particular:
+
+* Daily updates are **not guaranteed**
+* Preventing **gaps in accumulated minute data** has priority
+* Updates are performed on trading days whenever possible
+
+Minute data is updated most frequently to ensure continuity.
+
+Hourly and daily data are updated on a **rotation basis** to reduce unnecessary repeated downloads and to remain considerate of public data sources.
+These datasets are guaranteed to be **no older than one week**.
+
+For most training scenarios, this is fully sufficient.
+When models are deployed in real-world environments, current market data is typically provided directly by the target trading platform.
+
+---
+
+## 📈 Scope & Growth
+
+TroveLedger started with a curated universe of approximately 500 equities inherited from earlier *Preliminary* datasets.
+
+Going forward:
+
+* Entire indices are added step by step
+* The covered universe will grow continuously
+* Expansion is performed incrementally to ensure data integrity and operational stability
+
+This gradual approach allows issues to be detected early and handled without disrupting existing data.
+
+---
+
+## 🎯 Intended Use
+
+TroveLedger is suitable for:
+
+* machine learning on financial time series
+* intraday and swing trading research
+* feature engineering on OHLC data
+* backtesting strategies requiring dense intraday history
+* exploratory quantitative analysis
+
+---
+
+## ⚠️ Notes on Data Sources
+
+Data is derived from publicly accessible market data sources (e.g. via yfinance).
+
+While care is taken to ensure consistency and continuity, this dataset is provided **as-is** and without guarantees regarding completeness or correctness.
+
+Users are responsible for verifying suitability for their specific use cases and for complying with the terms of the original data providers.
+
+---
+
+## 💬 Community & Feedback
+
+Questions, observations, and constructive feedback are welcome via the **Community** tab.
+
+TroveLedger is intended to evolve over time — thoughtful input helps steer that evolution in a useful direction.
+
+---
+
+## License & Usage
+
+This dataset is provided **solely for non-commercial research and educational purposes**.
+
+The data is retrieved from public sources via the yfinance library (Yahoo Finance). All rights remain with the original data providers.
+
+Redistribution of this dataset is **not permitted** without explicit permission from the original sources.
+
+See the [`LICENSE`](./LICENSE) file for full details.
+
+NO WARRANTY IS PROVIDED. Use at your own risk.
+
+---
+
+## 🔚 Final note (subtle personality, optional)
+
+TroveLedger is not built to chase yesterday’s tick.
+It is built to **remember**.

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