feat: price trend signal (best time to buy)#77
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computePriceTrend() analyzes sold comp history and returns:
- direction (falling/rising/stable), signal (good_buy/wait/fair)
- 7d and 30d price changes (% and $)
- per-source breakdown with bestSource
- human-readable summary ("Down 8% this week")
Added to /api/price-history response as trend object (null if <3
data points). 10 unit tests + 3 API tests.
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Summary
computePriceTrend()analyzes sold comp history: direction (falling/rising/stable), signal (good_buy/wait/fair), 7d/30d changes, per-source breakdown, human-readable summary/api/price-historyresponse astrendobject (null if <3 data points)redisfield check)Type
Endpoints
GET /api/price-history— now includestrendobject in responseChecks
yarn test:unitpasses (140 tests, +10 new)Infrastructure
None
Frontend impact
Lovable prompt #29 ready — trend badge on card view and search results using
trend.summary,trend.signal,trend.bestSourceDeploy notes
None — standard auto-deploy