feat
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symbols-v2-p1
feat/symbols-v2-p1-coupling-count
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feat(symbols-v2-p1): add coupling_count to MusehubSymbolVitals
Pre-computed at push time: the number of distinct symbols a given symbol co-changes with. Populated by _update_coupling_counts() after _upsert_symbol_coupling() runs — a single UPDATE...FROM subquery that syncs vitals from the coupling table.
Enables the symbol list page to show a per-row coupling score via a simple LEFT JOIN — no aggregation at request time.
- musehub_symbol_vitals.coupling_count INT NOT NULL DEFAULT 0 - Migration 0032 (adds column to existing table) - 7 TDD tests (V101–V107) all green
sha256:f52795a1fb17d4849fe51225587f7303ba2da54d5f82911630ec77fa46d76d3f
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sha256:de498586197e88c4ed0804de77133ac102715544b1fb08ccc9152d27b843d79b
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