snapshots: Move external snapshot creation to backend

pkg/models/dashboard_snapshot.go

@@ -8,14 +8,15 @@ import (
 
 // DashboardSnapshot model
 type DashboardSnapshot struct {
-	Id          int64
-	Name        string
-	Key         string
-	DeleteKey   string
-	OrgId       int64
-	UserId      int64
-	External    bool
-	ExternalUrl string
+	Id                int64
+	Name              string
+	Key               string
+	DeleteKey         string
+	OrgId             int64
+	UserId            int64
+	External          bool
+	ExternalUrl       string
+	ExternalDeleteUrl string
 
 	Expires time.Time
 	Created time.Time
@@ -48,7 +49,10 @@ type CreateDashboardSnapshotCommand struct {
 	Expires   int64            `json:"expires"`
 
 	// these are passed when storing an external snapshot ref
-	External  bool   `json:"external"`
+	External          bool   `json:"external"`
+	ExternalUrl       string `json:"-"`
+	ExternalDeleteUrl string `json:"-"`
+
 	Key       string `json:"key"`
 	DeleteKey string `json:"deleteKey"`