zephyrdark 5479c36985 feat: add stock and sector data collectors
Implement StockCollector to fetch stock master data from KRX
(Korea Exchange) including market cap, EPS, BPS, and dividend info.
Implement SectorCollector to fetch WICS sector classification from
WISEindex. Both collectors use PostgreSQL upsert for efficient updates.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-02-02 23:38:45 +09:00
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