A kind of initial commit

app/utils/text.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+import re
+
+
+_WS_RE = re.compile(r"\s+")
+_FEAT_RE = re.compile(r"\s*[\(\[\-–—]\s*(feat|ft)\.?.*$", re.IGNORECASE)
+
+
+def normalize_track_signature(name: str, artists: list[str]) -> str:
+    clean_name = _FEAT_RE.sub("", name).strip().lower()
+    clean_name = _WS_RE.sub(" ", clean_name)
+    clean_artists = ",".join(sorted(a.strip().lower() for a in artists if a.strip()))
+    return f"{clean_name}::{clean_artists}"