Store library settings in the pool index and drop legacy sidecars

src/core/file.py

@@ -1,5 +1,4 @@
 from pathlib import Path
-import json
 from .tag import Tag
 
 # Bump this when the csfd_cache schema changes to force re-fetch on next open.
@@ -11,9 +10,9 @@ class File:
     def __init__(self, file_path: Path, tagmanager=None, index=None) -> None:
         self.file_path = file_path
         self.filename = file_path.name
-        self.metadata_filename = self.file_path.parent / f".{self.filename}.!tag"
-        # Optional unified pool index; when set, metadata lives there instead of
-        # in the sidecar file (see PoolIndex).
+        # Unified pool index; when set, metadata is persisted there (see
+        # PoolIndex). Without an index a File is an in-memory object only — no
+        # metadata is written to disk (there are no per-file sidecars anymore).
         self.index = index
         self.new = True
         self.ignored = False
@@ -38,20 +37,12 @@ class File:
         self.get_metadata()
 
     def get_metadata(self) -> None:
-        if self.index is not None:
-            record = self.index.get(self.file_path)
-            if record is None:
-                self._init_new_metadata()
-                self.save_metadata()
-            else:
-                self._apply_record(record)
-            return
-
-        if not self.metadata_filename.exists():
+        record = self.index.get(self.file_path) if self.index is not None else None
+        if record is None:
             self._init_new_metadata()
             self.save_metadata()
         else:
-            self.load_metadata()
+            self._apply_record(record)
 
     def _init_new_metadata(self) -> None:
         self.new = True
@@ -111,17 +102,9 @@ class File:
                 self.tags.append(tag)
 
     def save_metadata(self):
-        data = self._build_record()
+        """Persist metadata to the pool index; a no-op for an index-less File."""
         if self.index is not None:
-            self.index.set(self.file_path, data)
-            return
-        with open(self.metadata_filename, "w", encoding="utf-8") as f:
-            json.dump(data, f, indent=2, ensure_ascii=False)
-
-    def load_metadata(self) -> None:
-        with open(self.metadata_filename, "r", encoding="utf-8") as f:
-            data = json.load(f)
-        self._apply_record(data)
+            self.index.set(self.file_path, self._build_record())
 
     def added_timestamp(self) -> float:
         """Epoch seconds for 'date added' — the stored ``added`` or the file mtime.
@@ -181,27 +164,21 @@ class File:
         self.save_metadata()
 
     def delete_metadata(self) -> None:
-        """Remove this file's metadata (from the index, or its sidecar file)."""
+        """Remove this file's metadata from the pool index (no-op without one)."""
         if self.index is not None:
             self.index.delete(self.file_path)
-        elif self.metadata_filename.exists():
-            self.metadata_filename.unlink()
 
     def relocate(self, new_path: Path) -> None:
         """Point this File at a new path, moving its metadata along.
 
         The physical file must already have been moved/renamed by the caller.
-        Drops the metadata under the old path (index key or sidecar) and rebinds
-        to the new path; call ``save_metadata()`` afterwards to write it back.
+        Drops the metadata under the old index key and rebinds to the new path;
+        call ``save_metadata()`` afterwards to write it back.
         """
-        old_metadata_filename = self.metadata_filename
         if self.index is not None:
             self.index.delete(self.file_path)
         self.file_path = Path(new_path)
         self.filename = self.file_path.name
-        self.metadata_filename = self.file_path.parent / f".{self.filename}.!tag"
-        if self.index is None and old_metadata_filename.exists():
-            old_metadata_filename.rename(self.metadata_filename)
 
     def set_date(self, date_str: str | None):
         """Nastaví datum (např. '2025-09-25') nebo None pro smazání."""