Charts: color picker for loadpoints and consumers (#30021)

ui/colors.go

@@ -0,0 +1,30 @@
+// Package ui persists UI-only state (color overrides, etc.).
+package ui
+
+import (
+	"maps"
+	"sync"
+
+	"github.com/evcc-io/evcc/core/keys"
+	"github.com/evcc-io/evcc/server/db/settings"
+)
+
+var colorsMu sync.RWMutex
+
+// GetDeviceColors returns the persisted title→hex map (never nil).
+func GetDeviceColors() map[string]string {
+	colorsMu.RLock()
+	defer colorsMu.RUnlock()
+	m := map[string]string{}
+	_ = settings.Json(keys.DeviceColors, &m)
+	return m
+}
+
+// SaveDeviceColors persists the title→hex map.
+func SaveDeviceColors(m map[string]string) error {
+	colorsMu.Lock()
+	defer colorsMu.Unlock()
+	clean := make(map[string]string, len(m))
+	maps.Copy(clean, m)
+	return settings.SetJson(keys.DeviceColors, clean)
+}