added database models and models for continous use. Also changed get all paths according to that. Nothing is testet yet!

src-tauri/src/models/exercise.rs

@@ -1,6 +1,7 @@
+#[derive(Debug, Clone)]
 pub struct Exercise {
-    id: u16,
-    ex_type: String,
-    content: String,
-    node_id: u32
+    pub id: u16,
+    pub ex_type: String,
+    pub content: String,
+    pub node_id: u32,
 }