feat(storage): add storage package base

backend/packages/storage/store/common/__init__.py

@@ -0,0 +1,5 @@
+from .enums import DataBaseType
+
+__all__ = [
+    'DataBaseType',
+]

backend/packages/storage/store/common/enums.py

@@ -0,0 +1,41 @@
+from enum import Enum
+from enum import IntEnum as SourceIntEnum
+from enum import StrEnum as SourceStrEnum
+from typing import Any, TypeVar
+
+T = TypeVar('T', bound=Enum)
+
+
+class _EnumBase:
+    """Base enum class with common utility methods."""
+
+    @classmethod
+    def get_member_keys(cls) -> list[str]:
+        """Return a list of enum member names."""
+        return list(cls.__members__.keys())
+
+    @classmethod
+    def get_member_values(cls) -> list:
+        """Return a list of enum member values."""
+        return [item.value for item in cls.__members__.values()]
+
+    @classmethod
+    def get_member_dict(cls) -> dict[str, Any]:
+        """Return a dict mapping member names to values."""
+        return {name: item.value for name, item in cls.__members__.items()}
+
+
+class IntEnum(_EnumBase, SourceIntEnum):
+    """Integer enum base class."""
+
+
+class StrEnum(_EnumBase, SourceStrEnum):
+    """String enum base class."""
+
+
+class DataBaseType(StrEnum):
+    """Database type."""
+
+    sqlite = 'sqlite'
+    mysql = 'mysql'
+    postgresql = 'postgresql'