diff --git a/api/db/workflow_client.py b/api/db/workflow_client.py
index 17b67e9..8d2d406 100644
--- a/api/db/workflow_client.py
+++ b/api/db/workflow_client.py
@@ -465,7 +465,7 @@ class WorkflowClient(BaseDBClient):
                 return
 
             existing = workflow.call_disposition_codes or {}
-            codes = existing.get("disposition_codes", [])
+            codes = list(existing.get("disposition_codes", []))
             if disposition_code in codes:
                 return
 
diff --git a/api/tests/test_add_call_disposition_code.py b/api/tests/test_add_call_disposition_code.py
new file mode 100644
index 0000000..9d04832
--- /dev/null
+++ b/api/tests/test_add_call_disposition_code.py
@@ -0,0 +1,85 @@
+"""Test that add_call_disposition_code correctly persists changes.
+
+The bug: `codes` is a reference to the list inside the JSON column value.
+Calling `codes.append()` mutates the in-memory column value in-place.
+When SQLAlchemy compares old vs new on commit, it sees them as equal
+because the old value was already mutated — so the change is silently dropped.
+"""
+
+import asyncio
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
+
+from api.db.workflow_client import WorkflowClient
+
+
+def _make_workflow_stub(initial_disposition_codes):
+    """Create a mock workflow that behaves like a SQLAlchemy model instance.
+
+    Tracks attribute assignments so we can verify the new value is genuinely
+    different from the original (which is what SQLAlchemy needs to detect a change).
+    """
+    workflow = MagicMock()
+    # Store the initial value and track what gets assigned
+    workflow.call_disposition_codes = initial_disposition_codes
+    workflow._assigned_values = {}
+
+    original_setattr = type(workflow).__setattr__
+
+    def tracking_setattr(self, name, value):
+        if name == "call_disposition_codes":
+            self._assigned_values[name] = value
+        original_setattr(self, name, value)
+
+    type(workflow).__setattr__ = tracking_setattr
+    return workflow
+
+
+@pytest.fixture
+def client():
+    with patch("api.db.workflow_client.BaseDBClient.__init__", return_value=None):
+        c = WorkflowClient()
+        c.async_session = MagicMock()
+        return c
+
+
+def test_disposition_code_new_value_is_not_same_reference(client):
+    """The assigned list must NOT be the same object as the original.
+
+    If it is, SQLAlchemy won't detect the change because old == new
+    (the old was mutated in-place).
+    """
+    initial_codes = {"disposition_codes": ["existing_code"]}
+    original_list = initial_codes["disposition_codes"]
+
+    workflow = MagicMock()
+    workflow.call_disposition_codes = initial_codes
+
+    # Mock the session and query
+    mock_session = AsyncMock()
+    mock_result = MagicMock()
+    mock_result.scalars.return_value.first.return_value = workflow
+    mock_session.execute = AsyncMock(return_value=mock_result)
+    mock_session.commit = AsyncMock()
+    mock_session.__aenter__ = AsyncMock(return_value=mock_session)
+    mock_session.__aexit__ = AsyncMock(return_value=False)
+
+    client.async_session = MagicMock(return_value=mock_session)
+
+    asyncio.get_event_loop().run_until_complete(
+        client.add_call_disposition_code(workflow_id=1, disposition_code="new_code")
+    )
+
+    # Verify the disposition code was added
+    assigned = workflow.call_disposition_codes
+    assert "new_code" in assigned["disposition_codes"]
+
+    # THE CRITICAL CHECK: the list inside the assigned value must be a *different*
+    # object from the original list. If it's the same object, SQLAlchemy's change
+    # detection won't work because the "old" value was mutated in-place.
+    assert assigned["disposition_codes"] is not original_list, (
+        "The assigned disposition_codes list is the same object as the original. "
+        "This means SQLAlchemy won't detect the change because the old value "
+        "was mutated in-place via list.append()."
+    )
diff --git a/ui/src/components/flow/edges/CustomEdge.tsx b/ui/src/components/flow/edges/CustomEdge.tsx
index 0d2fc3c..9965e2b 100644
--- a/ui/src/components/flow/edges/CustomEdge.tsx
+++ b/ui/src/components/flow/edges/CustomEdge.tsx
@@ -36,10 +36,26 @@ const EdgeDetailsDialog = ({ open, onOpenChange, data, onSave }: EdgeDetailsDial
         }
     }, [data, open]);
 
-    const handleSave = () => {
+    const handleSave = useCallback(() => {
         onSave({ condition: condition, label: label, transition_speech: transitionSpeech || undefined });
         onOpenChange(false);
-    };
+    }, [condition, label, transitionSpeech, onSave, onOpenChange]);
+
+    // Handle Cmd+S / Ctrl+S keyboard shortcut to save
+    useEffect(() => {
+        if (!open) return;
+
+        const handleKeyDown = (e: KeyboardEvent) => {
+            if ((e.metaKey || e.ctrlKey) && e.key === 's') {
+                e.preventDefault();
+                e.stopImmediatePropagation();
+                handleSave();
+            }
+        };
+
+        window.addEventListener('keydown', handleKeyDown, true);
+        return () => window.removeEventListener('keydown', handleKeyDown, true);
+    }, [open, handleSave]);
 
     return (
         <Dialog open={open} onOpenChange={onOpenChange}>