initial commit after split

src/govoplan_files/backend/storage/common.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime, timezone
+
+from govoplan_files.backend.db.models import FileAsset, FileBlob, FileVersion
+
+
+class FileStorageError(RuntimeError):
+    pass
+
+
+@dataclass(slots=True)
+class UploadedStoredFile:
+    asset: FileAsset
+    version: FileVersion
+    blob: FileBlob
+
+
+@dataclass(slots=True)
+class ResolvedPattern:
+    pattern: str
+    matches: list[FileAsset]
+
+
+@dataclass(slots=True)
+class FileConflictResolution:
+    target_path: str
+    action: str
+    new_path: str | None = None
+
+
+@dataclass(slots=True)
+class RenamePlanItem:
+    kind: str
+    id: str
+    old_path: str
+    new_path: str
+
+
+def utcnow() -> datetime:
+    return datetime.now(timezone.utc)