Refactoring for new config setup

src/auto_archiver/core/database.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+from dataclasses import dataclass
+from abc import abstractmethod, ABC
+from typing import Union
+
+from auto_archiver.core import Metadata, BaseModule
+
+
+@dataclass
+class Database(BaseModule):
+
+    def started(self, item: Metadata) -> None:
+        """signals the DB that the given item archival has started"""
+        pass
+
+    def failed(self, item: Metadata, reason:str) -> None:
+        """update DB accordingly for failure"""
+        pass
+
+    def aborted(self, item: Metadata) -> None:
+        """abort notification if user cancelled after start"""
+        pass
+
+    # @abstractmethod
+    def fetch(self, item: Metadata) -> Union[Metadata, bool]:
+        """check and fetch if the given item has been archived already, each database should handle its own caching, and configuration mechanisms"""
+        return False
+
+    @abstractmethod
+    def done(self, item: Metadata, cached: bool=False) -> None:
+        """archival result ready - should be saved to DB"""
+        pass