Task_9: Postgres (adaption)

# Conflicts:
#	storage.py

storage.py

@@ -13,8 +13,8 @@ class StorageError(Exception):
     pass
 
 
-class StorageAdapter(ABC):
+class StorageWriter(ABC):
-    """Abstrakte Basisklasse für POI-Storage-Backends."""
+    """Write-only Interface. Klassen MÜSSEN explizit erben."""
 
     @abstractmethod
     def store(self, results: list[POI]) -> str:
@@ -27,30 +27,32 @@ class StorageAdapter(ABC):
         Returns:
             str: Identifier der gespeicherten Ressource
                  (Dateipfad, DB-Tabelle, URL, etc.)
-
         Raises:
             StorageError: Bei Schreibfehlern.
         """
         raise NotImplementedError
 
 
-class JsonStorage(StorageAdapter):
+class JsonStorage(StorageWriter):
+    """
+    """
     def __init__(self, output_dir: Path = Path(".")):
         self.output_dir = output_dir
+        self._path = self.output_dir / "pois.json"
 
     def store(self, results: list[POI]) -> str:
-        output_path = self.output_dir / "pois.json"
         try:
-            with output_path.open("w", encoding="utf-8") as f:
+            with self._path.open("w", encoding="utf-8") as f:
                 json.dump([asdict(poi) for poi in results], f, indent=2, ensure_ascii=False)
         except OSError as exc:
-            logger.error(f"Fehler beim Speichern:{exc}")
+            logger.error(f"Fehler beim Speichern: {exc}")
             raise StorageError("Fehler beim Speichern der POIs") from exc
-        return str(output_path.resolve())
+        return str(self._path.resolve())
 
 
 
-class PostgresStorage(StorageAdapter):
+class PostgresStorage(StorageWriter):
+
     def __init__(self, connection_string: str, table: str = "pois"):
         pass