Use startup_time from system.connected (#300)

* Handle startup time

* Remove dead code

* Bump protocol version + FE changes

backend/src/node/message.rs

@@ -8,18 +8,11 @@ use crate::types::{Block, BlockNumber, BlockHash};
 #[derive(Deserialize, Debug, Message)]
 #[rtype(result = "()")]
 pub struct NodeMessage {
-    pub level: Level,
     pub ts: DateTime<Utc>,
     #[serde(flatten)]
     pub details: Details,
 }
 
-#[derive(Deserialize, Debug)]
-pub enum Level {
-    #[serde(rename = "INFO")]
-    Info,
-}
-
 #[derive(Deserialize, Debug)]
 #[serde(tag = "msg")]
 pub enum Details {