feat: add state version to State

crates/ascend/Cargo.toml

@@ -34,6 +34,7 @@ tracing-subscriber-wasm = "0.1.0"
 ron = { version = "0.8" }
 rand = { version = "0.8", optional = true }
 web-sys = { version = "0.3.76", features = ["File", "FileList"] }
+smart-default = "0.7.1"
 
 [dev-dependencies.serde_json]
 version = "1"

crates/ascend/src/server.rs

@@ -43,11 +43,14 @@ pub mod cli {
 pub mod state {
     //! Server state
 
+    const STATE_VERSION: u64 = 1;
+
     use super::persistence::Persistent;
     use crate::models;
     use crate::models::Wall;
     use serde::Deserialize;
     use serde::Serialize;
+    use smart_default::SmartDefault;
     use std::collections::BTreeSet;
 
     #[derive(Clone, Debug)]
@@ -55,8 +58,12 @@ pub mod state {
         pub persistent: Persistent<PersistentState>,
     }
 
-    #[derive(Serialize, Deserialize, Clone, Debug, Default)]
+    #[derive(Serialize, Deserialize, Clone, Debug, SmartDefault)]
     pub struct PersistentState {
+        /// State schema version
+        #[default(STATE_VERSION)]
+        pub version: u64,
+
         pub wall: Wall,
         pub problems: Problems,
     }