fix: truncate "params" column on vertex_build table to prevent memory heap on database (#4118)

* ✨ (model.py): add new method `serialize_params` to serialize parameters data in VertexBuildBase class

* 🐛 (util_strings.py): fix truncation logic to correctly handle long strings by truncating them with ellipsis if they exceed the maximum length

* ✅ (test_truncate_long_strings.py): add unit tests for the truncate_long_strings function to ensure it works correctly with various input scenarios

* ✅ (test_truncate_long_strings_on_objects.py): update test assertion message to reflect the expected behavior of the function

src/backend/base/langflow/services/database/models/vertex_builds/model.py

@@ -49,6 +49,10 @@ class VertexBuildBase(SQLModel):
     def serialize_artifacts(self, data) -> dict:
         return truncate_long_strings(data)
 
+    @field_serializer("params")
+    def serialize_params(self, data) -> dict:
+        return truncate_long_strings(data)
+
 
 class VertexBuildTable(VertexBuildBase, table=True):  # type: ignore[call-arg]
     __tablename__ = "vertex_build"

src/backend/base/langflow/utils/util_strings.py

@@ -9,7 +9,12 @@ def truncate_long_strings(data, max_length=None):
     if max_length is None:
         max_length = constants.MAX_TEXT_LENGTH
 
-    if max_length < 0 or not isinstance(data, dict | list):
+    if max_length < 0:
+        return data
+
+    if not isinstance(data, dict | list):
+        if isinstance(data, str) and len(data) > max_length:
+            return data[:max_length] + "..."
         return data
 
     if isinstance(data, dict):