first commit of restructured project

trahn-trade-backend/internal/models/sr.go

@@ -0,0 +1,27 @@
+package models
+
+import (
+	"math"
+	"time"
+)
+
+type SupportResistance struct {
+	ID               int64     `json:"id"`
+	Timestamp        time.Time `json:"timestamp"`
+	Method           string    `json:"method"`
+	LookbackDays     int       `json:"lookbackDays"`
+	Support          float64   `json:"support"`
+	Resistance       float64   `json:"resistance"`
+	Midpoint         float64   `json:"midpoint"`
+	AvgPrice         *float64  `json:"avgPrice,omitempty"`
+	GridRecalculated bool      `json:"gridRecalculated"`
+	CreatedAt        time.Time `json:"createdAt"`
+}
+
+func (sr *SupportResistance) HasChangedSignificantly(previous *SupportResistance, thresholdPercent float64) bool {
+	if previous == nil || previous.Midpoint == 0 {
+		return true
+	}
+	change := math.Abs((sr.Midpoint - previous.Midpoint) / previous.Midpoint * 100)
+	return change >= thresholdPercent
+}