Bill 9e05ce0891 fix: prevent price data overwrite on container restart ...

Preserve existing merged.jsonl to avoid data loss and API rate limits.
Only fetch new data if merged.jsonl is missing or empty.

Problem:
- Entrypoint always fetched fresh data from Alpha Vantage on every start
- Overwrote existing mounted data directory
- Caused API rate limit issues and data inconsistencies
- Lost historical data needed for backtesting specific date ranges

Solution:
- Check if merged.jsonl exists and has content before fetching
- Display stock count when using existing data
- Provide manual refresh instructions for when updates are needed

Benefits:
- Faster container startup (no API calls if data exists)
- Avoids Alpha Vantage rate limits (5 calls/min, 500/day)
- Preserves user's existing historical datasets
- Enables reliable backtesting with consistent data

To refresh data: rm data/merged.jsonl && docker-compose restart

2025-10-30 23:27:58 -04:00

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