diff --git a/u232ping/abc/db.py b/u232ping/abc/db.py
new file mode 100644
index 0000000..942c59a
--- /dev/null
+++ b/u232ping/abc/db.py
@@ -0,0 +1,13 @@
+from abc import ABC, abstractmethod
+from u232ping.types import Group
+
+class DataBase(ABC):
+
+    @abstractmethod
+    async def get_group(self,  group_idx: int) -> Group:
+        raise NotImplementedError
+
+     
+    @abstractmethod
+    async def get_all(self) -> Group:
+        raise NotImplementedError
diff --git a/u232ping/types.py b/u232ping/types.py
new file mode 100644
index 0000000..59b207d
--- /dev/null
+++ b/u232ping/types.py
@@ -0,0 +1,12 @@
+from typing import Iterable
+
+class Group(object):
+
+    members: Iterable
+
+    def __init__(self, members: Iterable) -> None:
+        self.members = members
+
+    def __str__(self) -> str:
+        lst = tuple(map(lambda member: f"@{member}", self.members))
+        return "/n".join(lst)