diff --git a/t4_devkit/common/sanity.py b/t4_devkit/common/sanity.py
deleted file mode 100644
index 7dcf70f..0000000
--- a/t4_devkit/common/sanity.py
+++ /dev/null
@@ -1,91 +0,0 @@
-from __future__ import annotations
-
-import warnings
-from enum import Enum, unique
-from pathlib import Path
-
-from attrs import define
-
-from t4_devkit import Tier4, load_metadata
-
-__all__ = ["DBException", "sanity_check"]
-
-
-@define
-class DBException:
-    """A dataclass to store error message of the corresponding dataset.
-
-    Attributes:
-        dataset_id (str): Dataset ID.
-        version (str | None): Dataset version.
-        status (DBStatus): Status of the dataset.
-        message (str): Error or warning message.
-    """
-
-    dataset_id: str
-    version: str | None
-    status: DBStatus
-    message: str | None = None
-
-    def is_ok(self) -> bool:
-        """Return True if the status is OK."""
-        return self.status == DBStatus.OK
-
-
-@unique
-class DBStatus(str, Enum):
-    OK = "OK"
-    WARNING = "WARNING"
-    ERROR = "ERROR"
-
-
-def sanity_check(
-    db_root: str | Path,
-    *,
-    revision: str | None = None,
-    include_warning: bool = False,
-) -> DBException:
-    """Perform sanity check and report exception or warning encountered while loading the dataset.
-
-    Args:
-        db_root (str | Path): Path to root directory of the dataset.
-        revision (str | None, optional): Specific version of the dataset.
-            If None, search the latest one.
-        include_warning (bool, optional): Indicates whether to report warnings.
-
-    Returns:
-        Exception or warning if exits, otherwise returns None.
-    """
-
-    with warnings.catch_warnings():
-        if include_warning:
-            warnings.filterwarnings("error")
-        else:
-            warnings.filterwarnings("ignore")
-
-        try:
-            t4 = Tier4(data_root=db_root, revision=revision, verbose=False)
-            exception = DBException(
-                dataset_id=t4.dataset_id,
-                version=t4.version,
-                status=DBStatus.OK,
-            )
-        except Warning as w:
-            metadata = load_metadata(db_root)
-
-            exception = DBException(
-                dataset_id=metadata.dataset_id,
-                version=metadata.version,
-                status=DBStatus.WARNING,
-                message=str(w),
-            )
-        except Exception as e:
-            metadata = load_metadata(db_root)
-
-            exception = DBException(
-                dataset_id=metadata.dataset_id,
-                version=metadata.version,
-                status=DBStatus.ERROR,
-                message=str(e),
-            )
-    return exception