feat(api-key): show last used IP

backend/internal/handler/dto/api_key_mapper_last_used_test.go

@@ -10,6 +10,7 @@ import (
 
 func TestAPIKeyFromService_MapsLastUsedAt(t *testing.T) {
 	lastUsed := time.Now().UTC().Truncate(time.Second)
+	lastUsedIP := "203.0.113.10"
 	src := &service.APIKey{
 		ID:                 1,
 		UserID:             2,
@@ -17,6 +18,7 @@ func TestAPIKeyFromService_MapsLastUsedAt(t *testing.T) {
 		Name:               "Mapper",
 		Status:             service.StatusActive,
 		LastUsedAt:         &lastUsed,
+		LastUsedIP:         &lastUsedIP,
 		CurrentConcurrency: 3,
 	}
 
@@ -24,6 +26,8 @@ func TestAPIKeyFromService_MapsLastUsedAt(t *testing.T) {
 	require.NotNil(t, out)
 	require.NotNil(t, out.LastUsedAt)
 	require.WithinDuration(t, lastUsed, *out.LastUsedAt, time.Second)
+	require.NotNil(t, out.LastUsedIP)
+	require.Equal(t, lastUsedIP, *out.LastUsedIP)
 	require.Equal(t, 3, out.CurrentConcurrency)
 }
 
@@ -39,4 +43,5 @@ func TestAPIKeyFromService_MapsNilLastUsedAt(t *testing.T) {
 	out := APIKeyFromService(src)
 	require.NotNil(t, out)
 	require.Nil(t, out.LastUsedAt)
+	require.Nil(t, out.LastUsedIP)
 }

backend/internal/handler/dto/mappers.go

@@ -89,6 +89,7 @@ func APIKeyFromService(k *service.APIKey) *APIKey {
 		IPWhitelist:        k.IPWhitelist,
 		IPBlacklist:        k.IPBlacklist,
 		LastUsedAt:         k.LastUsedAt,
+		LastUsedIP:         k.LastUsedIP,
 		Quota:              k.Quota,
 		QuotaUsed:          k.QuotaUsed,
 		ExpiresAt:          k.ExpiresAt,

backend/internal/handler/dto/types.go

@@ -59,6 +59,7 @@ type APIKey struct {
 	IPWhitelist []string   `json:"ip_whitelist"`
 	IPBlacklist []string   `json:"ip_blacklist"`
 	LastUsedAt  *time.Time `json:"last_used_at"`
+	LastUsedIP  *string    `json:"last_used_ip"`
 	Quota       float64    `json:"quota"`      // Quota limit in USD (0 = unlimited)
 	QuotaUsed   float64    `json:"quota_used"` // Used quota amount in USD
 	ExpiresAt   *time.Time `json:"expires_at"` // Expiration time (nil = never expires)