feat: track maximum recorded nonce for captcha levels to render progress bar

db/db-core/src/lib.rs

@@ -292,6 +292,21 @@ pub trait MCDatabase: std::marker::Send + std::marker::Sync + CloneSPDatabase {
 
     /// Get all psuedo IDs
     async fn analytics_get_all_psuedo_ids(&self, page: usize) -> DBResult<Vec<String>>;
+
+    /// Track maximum nonce received against captcha levels
+    async fn update_max_nonce_for_level(
+        &self,
+        captcha_key: &str,
+        difficulty_factor: u32,
+        latest_nonce: u32,
+    ) -> DBResult<()>;
+
+    /// Get maximum nonce tracked so far for captcha levels
+    async fn get_max_nonce_for_level(
+        &self,
+        captcha_key: &str,
+        difficulty_factor: u32,
+    ) -> DBResult<u32>;
 }
 
 #[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq)]

db/db-core/src/tests.rs

@@ -310,6 +310,33 @@ pub async fn database_works<'a, T: MCDatabase>(
         .unwrap();
     // analytics end
 
+    // nonce tracking start
+    assert_eq!(
+        db.get_max_nonce_for_level(c.key, l[0].difficulty_factor)
+            .await
+            .unwrap(),
+        0
+    );
+    db.update_max_nonce_for_level(c.key, l[0].difficulty_factor, 1000)
+        .await
+        .unwrap();
+    assert_eq!(
+        db.get_max_nonce_for_level(c.key, l[0].difficulty_factor)
+            .await
+            .unwrap(),
+        1000
+    );
+    db.update_max_nonce_for_level(c.key, l[0].difficulty_factor, 10_000)
+        .await
+        .unwrap();
+    assert_eq!(
+        db.get_max_nonce_for_level(c.key, l[0].difficulty_factor)
+            .await
+            .unwrap(),
+        10_000
+    );
+    // nonce tracking end
+
     assert_eq!(db.fetch_solve(p.username, c.key).await.unwrap().len(), 1);
     assert_eq!(
         db.fetch_config_fetched(p.username, c.key)