first commit

backend/internal/service/proxy_latency_cache.go

@@ -0,0 +1,23 @@
+package service
+
+import (
+	"context"
+	"time"
+)
+
+type ProxyLatencyInfo struct {
+	Success     bool      `json:"success"`
+	LatencyMs   *int64    `json:"latency_ms,omitempty"`
+	Message     string    `json:"message,omitempty"`
+	IPAddress   string    `json:"ip_address,omitempty"`
+	Country     string    `json:"country,omitempty"`
+	CountryCode string    `json:"country_code,omitempty"`
+	Region      string    `json:"region,omitempty"`
+	City        string    `json:"city,omitempty"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+type ProxyLatencyCache interface {
+	GetProxyLatencies(ctx context.Context, proxyIDs []int64) (map[int64]*ProxyLatencyInfo, error)
+	SetProxyLatency(ctx context.Context, proxyID int64, info *ProxyLatencyInfo) error
+}