fix: restore _is_sensitive_field and sensitive field redaction in _safe_deepcopy_config

The function and associated constants (_SENSITIVE_FIELDS_EXACT,
_SENSITIVE_SUFFIXES) were accidentally dropped during the merge.
Restores telemetry-safe config cloning that redacts API keys,
passwords, and other secrets while preserving runtime auth objects.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mem0/memory/main.py

@@ -54,6 +54,8 @@ logger = logging.getLogger(__name__)
 
 
 # Fields that hold runtime auth/connection objects and must be preserved.
+# These are non-serializable objects (e.g. AWSV4SignerAuth, RequestsHttpConnection)
+# needed by clients like OpenSearch — not sensitive strings to redact.
 _RUNTIME_FIELDS = frozenset({
     "http_auth",
     "auth",
@@ -61,21 +63,70 @@ _RUNTIME_FIELDS = frozenset({
     "ssl_context",
 })
 
+# Fields that are known to contain sensitive secrets and must be redacted.
+_SENSITIVE_FIELDS_EXACT = frozenset({
+    "api_key",
+    "secret_key",
+    "private_key",
+    "access_key",
+    "password",
+})
+
+# Suffixes that indicate a field likely holds a secret value.
+_SENSITIVE_SUFFIXES = (
+    "_password",
+    "_secret",
+    "_token",
+    "_credential",
+    "_credentials",
+)
+
+
+def _is_sensitive_field(field_name: str) -> bool:
+    """Check if a field should be redacted for telemetry safety.
+
+    Uses a layered approach:
+    1. Runtime fields (allowlist) — always preserved, highest priority.
+    2. Exact deny list — known secret field names.
+    3. Suffix deny list — catches patterns like db_password, auth_secret, etc.
+    """
+    name = field_name.lower().strip()
+    if name in _RUNTIME_FIELDS:
+        return False
+    if name in _SENSITIVE_FIELDS_EXACT:
+        return True
+    return any(name.endswith(suffix) for suffix in _SENSITIVE_SUFFIXES)
+
 
 def _safe_deepcopy_config(config):
-    """Deep copy a config object, falling back to shallow copy if needed."""
+    """Safely deepcopy config, falling back to dict-based cloning for non-serializable objects."""
     try:
-        copied = deepcopy(config)
-    except Exception:
-        copied = config.__class__(**{k: v for k, v in config.__dict__.items()})
-    # Restore non-serializable runtime fields from the original config
-    for field in _RUNTIME_FIELDS:
-        if hasattr(config, field):
+        return deepcopy(config)
+    except Exception as e:
+        logger.debug(f"Deepcopy failed, using dict-based cloning: {e}")
+
+        config_class = type(config)
+
+        if hasattr(config, "model_dump"):
             try:
-                setattr(copied, field, getattr(config, field))
-            except (AttributeError, TypeError):
-                pass
-    return copied
+                clone_dict = config.model_dump()
+            except Exception:
+                clone_dict = dict(config.__dict__)
+        else:
+            clone_dict = dict(config.__dict__)
+
+        # Restore runtime fields, redact sensitive ones
+        for field_name in list(clone_dict.keys()):
+            if field_name in _RUNTIME_FIELDS and hasattr(config, field_name):
+                clone_dict[field_name] = getattr(config, field_name)
+            elif _is_sensitive_field(field_name):
+                clone_dict[field_name] = None
+
+        try:
+            return config_class(**clone_dict)
+        except Exception:
+            logger.debug("Config reconstruction failed, returning shallow dict clone")
+            return type("Config", (), clone_dict)()
 
 
 def _normalize_iso_timestamp_to_utc(timestamp: Optional[str]) -> Optional[str]: