Baseline modular DNS sync

dns_sync/models.py

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+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass(frozen=True)
+class DesiredRecord:
+    hostname: str
+    ip: str
+    record_type: str = "A"
+    wildcard: bool = False
+    source: str = ""
+    source_id: str | None = None
+
+
+@dataclass(frozen=True)
+class ProviderRecord:
+    hostname: str
+    ip: str
+    record_type: str = "A"
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass(frozen=True)
+class ProviderCapabilities:
+    record_types: frozenset[str] = frozenset({"A"})
+    wildcard_records: bool = False
+    supports_create: bool = True
+    supports_update: bool = True
+    supports_delete: bool = False
+    max_records: int | None = None
+
+
+@dataclass(frozen=True)
+class SyncAction:
+    action: str
+    desired: DesiredRecord
+    current: ProviderRecord | None = None
+    reason: str | None = None