chore: add more trace attrs, add truncate

pkg/es/es.graphqls

@@ -1,14 +1,17 @@
 
 type Meta @goModel(model: "github.com/sour-is/ev/pkg/es/event.Meta") {
     eventID: String! @goField(name: "getEventID")
-    streamID: String!
+    streamID: String! @goField(name: "ActualStreamID")
+    position: Int! @goField(name: "ActualPosition")
     created: Time!
-    position: Int!
 }
 
 extend type Query {
     events(streamID: String! paging: PageInput): Connection!
 }
+extend type Mutation {
+    truncateStream(streamID: String! index:Int!): Boolean!
+}
 extend type Subscription {
     """after == 0 start from begining, after == -1 start from end"""
     eventAdded(streamID: String! after: Int! = -1): Event
@@ -18,6 +21,9 @@ type Event implements Edge @goModel(model: "github.com/sour-is/ev/pkg/es.GQLEven
     id: ID!
 
     eventID: String!
+    streamID: String!
+    position: Int!
+
     values: Map!
     bytes: String!
     type: String!