I can delete a connection

src/components/workflows/components/WorkflowDesigner.py

@@ -124,6 +124,16 @@ class WorkflowDesigner(BaseComponent):
     
     return self.refresh_designer()
   
+  def delete_connection(self, from_id, to_id):
+    for connection in self._state.connections:
+      if connection.from_id == from_id and connection.to_id == to_id:
+        self._state.connections.remove(connection)
+    
+    # update db
+    self._db.save_state(self._key, self._state)
+    
+    return self.refresh_designer()
+  
   def set_designer_height(self, height):
     self._state.designer_height = height
     self._db.save_state(self._key, self._state)
@@ -201,10 +211,12 @@ class WorkflowDesigner(BaseComponent):
     return f"""
       <svg class="wkf-connection-line" style="left: 0; top: 0; width: 100%; height: 100%;"
            data-from-id="{conn.from_id}" data-to-id="{conn.to_id}">
-          <path d="{path}" stroke="#3b82f6" stroke-width="2" fill="none" marker-end="url(#arrowhead)"/>
+          <path d="{path}" class="wkf-connection-path-thick"/>
+          <path d="{path}" class="wkf-connection-path" marker-end="url(#arrowhead)"/>
+
           <defs>
               <marker id="arrowhead" markerWidth="10" markerHeight="7" refX="9" refY="3.5" orient="auto">
-                  <polygon points="0 0, 10 3.5, 0 7" fill="#3b82f6"/>
+                  <polygon points="0 0, 10 3.5, 0 7" class="wkf-connection-path-arrowhead"/>
               </marker>
           </defs>
       </svg>