feat: add scriptable housekeeper rule engine

src/ccma/storage/repository.py

@@ -34,11 +34,14 @@ DEFAULT_CONFIGURATION = {
             "rule_id": "standard-2022",
             "name": "Regulärer Beitrag ab 2022",
             "valid_from": "2022-01-01",
+            "valid_until": None,
             "annual_amount": "150.00",
             "admission_fee": "10.00",
             "annual_due": "01-31",
             "semiannual_due": ["01-31", "07-31"],
+            "entry_proration": {"mode": "monthly", "started_month": "included"},
             "first_payment_due_days_after_acceptance": 28,
+            "issue_days_before_due": 30,
             "reminder_fee": "5.00",
             "failed_debit_fee": "5.00",
         }
@@ -53,6 +56,7 @@ class MemberRepository:
 
     def initialize(self) -> None:
         self.members_root.mkdir(parents=True, exist_ok=True)
+        (self.root / "rules").mkdir(parents=True, exist_ok=True)
         config_path = self.root / "repository.json"
         if not config_path.exists():
             write_json_atomic(config_path, DEFAULT_CONFIGURATION)
@@ -272,6 +276,15 @@ class MemberRepository:
     def member_count(self) -> int:
         return sum(1 for _ in self._member_directories())
 
+    def get_configuration(self) -> dict:
+        try:
+            configuration = read_json(self.root / "repository.json")
+        except (OSError, ValueError, TypeError, json.JSONDecodeError) as exc:
+            raise RepositoryError(f"repository.json konnte nicht gelesen werden: {exc}") from exc
+        if not isinstance(configuration, dict):
+            raise RepositoryError("repository.json enthält keine gültige Konfiguration.")
+        return configuration
+
     def get_member_number_policy(self) -> dict[str, str]:
         try:
             config = read_json(self.root / "repository.json")