feat(cloud): harden multi-tenant runtime resources

tests/unit_tests/vector/test_vdb_base.py

@@ -5,7 +5,12 @@ from __future__ import annotations
 from unittest.mock import AsyncMock
 import pytest
 
-from langbot.pkg.vector.vdb import SearchType, VectorDatabase
+from langbot.pkg.vector.vdb import (
+    SearchType,
+    VectorDatabase,
+    remember_bounded_mapping,
+    remember_bounded_set,
+)
 
 
 class TestSearchType:
@@ -29,6 +34,18 @@ class TestSearchType:
         assert SearchType('hybrid') == SearchType.HYBRID
 
 
+def test_runtime_cache_helpers_bound_mapping_and_set():
+    mapping = {}
+    values = set()
+
+    for index in range(100):
+        remember_bounded_mapping(mapping, str(index), object(), 8)
+        remember_bounded_set(values, str(index), 8)
+
+    assert len(mapping) == 8
+    assert len(values) == 8
+
+
 class TestVectorDatabaseAbstractMethods:
     """Tests for VectorDatabase abstract methods."""