Derive the song performer gender and identify Pinkfong as Hope Segoine

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/decision-log.md

@@ -576,3 +576,27 @@
   更正而合流），逐字可對回的引述由 43,098 升至 44,122。
   更正表為外部參數而非寫死於程式——研究者的介入因此
   出現在重現命令上，且逐列可審、可 diff。
+
+## 2026-08-08
+
+- **署名 Pinkfong 的演出者實體指認為 Hope Segoine**：
+  Billboard 署名 Pinkfong 為品牌（Wikidata Q55735607，型態
+  brand），非演唱者；其唯一上榜曲 Baby Shark（2019#75）
+  的實際演唱者為 Hope Segoine（KTVB 2019-03-06 報導、
+  Songfacts、經紀簡介，出處詳私人留存的
+  QuickStatements 草稿）。藉既有的
+  署名正規化機制（`ArtistImporter.CANONICAL_ARTIST_NAMES`）
+  指認：歌曲的署名字串維持榜單所印的 "Pinkfong"，解析出
+  的演出者實體為 Hope Segoine。品牌無性別可言，人有；
+  本表記錄的其他項目為拼寫正規化，此筆為實體指認，屬
+  研究者裁定。
+
+- **歌曲層演出者性別的推導規則**：`build-db` 於套用
+  Wikidata 快照後，為每首歌自全體署名者（primary 與
+  featured 一律計入）的性別推導 `performer_gender`：已知
+  性別有兩種以上相異值即 `mixed`——未知者不可能翻案；
+  已知者全部同值且無未知，取該值；其餘（已知同值但有
+  未知，或全未知）留空。值域不折疊：non-binary、
+  genderfluid、trans woman 依快照原值參與比較，與 male／
+  female 相異即計入 `mixed`。此欄同步鏡射於
+  `data/derived/songs.csv` 的 `Performer Gender` 欄。

tools/src/pop_fem_audit_tools/commands/build_db.py

@@ -40,6 +40,11 @@ spelling, except for the names listed in
 ``ArtistImporter.CANONICAL_ARTIST_NAMES``, which always store the
 canonical spelling regardless of which variant is seen first.
 
+Once the artists carry their captured attributes, every song
+takes a performer gender derived from the genders of the artists
+credited on it, primary and featured alike; see
+`PerformerGenderDeriver.performer_gender`.
+
 On a successful build, two review CSV files, ``songs.csv`` and
 ``artists.csv``, are (re)written under the given output directory,
 mirroring the stored songs and artists without their IDs; see
@@ -311,6 +316,7 @@ class ArtistImporter:
         "cris mj": "Cris MJ",
         "mariah the scientist": "Mariah the Scientist",
         "surf mesa": "Surf Mesa",
+        "pinkfong": "Hope Segoine",
     }
     """The canonical artist spellings, keyed by the case-folded
     identity."""
@@ -609,6 +615,66 @@ class CaptureImporter:
                         setattr(artist, attribute, row[column])
 
 
+class PerformerGenderDeriver:
+    """The performer-gender job: derives the song-level performer
+    gender from the genders of the credited artists."""
+
+    MIXED: str = "mixed"
+    """The performer gender of a song whose credited artists do not
+    all share one gender."""
+
+    def __init__(self, session: Session) -> None:
+        """Initialize the deriver.
+
+        :param session: The database session.
+        """
+        self.__session: Session = session
+
+    def derive_performer_genders(self) -> None:
+        """Set the performer gender of every stored song.
+
+        Reads the songs back from the database, including any songs
+        pending in the same session, and sets
+        ``Song.performer_gender`` from the genders of the artists
+        credited on the song, primary and featured alike (see
+        `performer_gender`).  When the method returns, the derived
+        performer genders are queryable in the session.
+
+        :return: None.
+        """
+        song: Song
+        for song in self.__session.scalars(sa.select(Song)):
+            song.performer_gender = self.performer_gender(
+                [x.artist.gender for x in song.song_artists])
+        self.__session.flush()
+
+    @classmethod
+    def performer_gender(
+            cls, genders: Iterable[str | None]) -> str | None:
+        """Combine the credited artists' genders into one value.
+
+        A gender that is None or empty counts as unknown.  Two or
+        more distinct known genders give ``MIXED``, an unknown one
+        notwithstanding, as an unknown cannot undo a disagreement.
+        A single known gender shared by every credited artist gives
+        that gender.  Anything else -- a single known gender
+        alongside an unknown one, or no known gender at all -- gives
+        None.
+
+        :param genders: The genders of the artists credited on one
+            song, in any order.
+        :return: The performer gender of the song, or None when it
+            is undetermined.
+        """
+        values: list[str | None] = list(genders)
+        known: set[str] = {x for x in values if x}
+        if len(known) > 1:
+            return cls.MIXED
+        if len(known) == 1 and all(x for x in values):
+            return known.pop()
+        return None
+
+
 class CodingImporter:
     """The coding-import job: loads the settled coding table onto
     the stored songs."""
@@ -760,7 +826,8 @@ def reset_store(session: Session) -> None:
 class CSVExporter:
     """Writes the review CSV files mirroring the working store."""
 
-    __SONGS_HEADER: tuple[str, ...] = ("Title", "Artists", "Positions")
+    __SONGS_HEADER: tuple[str, ...] = (
+        "Title", "Artists", "Positions", "Performer Gender")
     """The header row of ``songs.csv``, for human readers."""
     __ARTISTS_HEADER: tuple[str, ...] = (
         "Name", "Wikidata QID", "Gender", "Type", "Genre", "Country",
@@ -852,7 +919,8 @@ class CSVExporter:
         for song in songs:
             row: list[str] = [
                 song.title, song.artist_credit,
-                self.__song_positions(song)]
+                self.__song_positions(song),
+                song.performer_gender or ""]
             rows.append(row)
         return rows
 
@@ -912,6 +980,7 @@ def main(argv: list[str] | None = None) -> int:
         ArtistImporter(session).import_artists()
         CaptureImporter(session).import_captures(
             args.lyrics_dir, args.wikidata_csv)
+        PerformerGenderDeriver(session).derive_performer_genders()
         CodingImporter(session).import_codings(args.codings)
         counts = StoreCounts.get_instance(session)
         CSVExporter(session, args.derived_dir).write()

tools/src/pop_fem_audit_tools/models.py

@@ -41,6 +41,11 @@ class Song(Base):
     """The combined artist credit string as printed on the chart."""
     lyrics: Mapped[str | None]
     """The lyrics text, when available."""
+    performer_gender: Mapped[str | None]
+    """The gender of the credited performers taken together:
+    "mixed" when they disagree, their common gender when every
+    credited artist's gender is known and they agree, and None
+    otherwise."""
     chart_entries: Mapped[list[ChartEntry]] \
         = relationship(back_populates="song")
     """The chart entries of the song."""

tools/tests/test_build_db.py

@@ -292,6 +292,14 @@ class TestBuildDB(unittest.TestCase):
         """
         self.__chart.write_text(content, encoding="utf-8")
 
+    def __write_wikidata(self, content: str) -> None:
+        """Write the Wikidata artist snapshot CSV fixture.
+
+        :param content: The CSV content.
+        :return: None.
+        """
+        self.__wikidata.write_text(content, encoding="utf-8")
+
     def __write_codings(self, content: str) -> None:
         """Write the coding CSV fixture.
 
@@ -538,6 +546,92 @@ class TestBuildDB(unittest.TestCase):
         assert artist is not None
         self.assertEqual(artist.name, "Surf Mesa")
 
+    def test_canonical_pinkfong_resolves_to_hope_segoine(
+            self) -> None:
+        """Test that a "Pinkfong" credit stores the artist named
+        "Hope Segoine", leaving the printed credit untouched."""
+        self.__write_chart(
+            "year,rank,title,artist\n"
+            "2016,1,Baby Shark,Pinkfong\n"
+            "2016,2,filler,Filler Artist\n"
+            "2017,1,filler2,Filler Artist Two\n"
+            "2017,2,filler3,Filler Artist Three\n")
+        status: int
+        stderr: str
+        status, stderr = self.__run_build()
+        self.assertEqual(status, 0)
+        session: Session = self.__session()
+        song: Song | None = session.scalar(
+            sa.select(Song).where(Song.title == "Baby Shark"))
+        assert song is not None
+        self.assertEqual(song.artist_credit, "Pinkfong")
+        self.assertEqual(
+            [x.artist.name for x in song.song_artists],
+            ["Hope Segoine"])
+
+    GENDER_CHART_CSV: str = (
+        "year,rank,title,artist\n"
+        "2016,1,Mixed Song,\"Adele, Drake & Nobody\"\n"
+        "2016,2,Female Song,Adele & Taylor Swift\n"
+        "2017,1,Unknown Song,Adele featuring Nobody\n"
+        "2017,2,No Gender Song,Nobody Else\n")
+    """The chart CSV fixture exercising the performer gender: a
+    disagreement with an unknown artist, an all-known agreement, an
+    agreement with an unknown artist, and no known gender."""
+
+    GENDER_WIKIDATA_CSV: str = (
+        "name,qid,gender,type,genre,country,note\n"
+        "Adele,Q2831,female,solo,pop,GB,\n"
+        "Drake,Q33240,male,solo,hip-hop,CA,\n"
+        "Taylor Swift,Q26876,female,solo,pop,US,\n")
+    """The artist snapshot fixture for the performer gender, leaving
+    "Nobody" and "Nobody Else" without a gender."""
+
+    def __performer_genders(self) -> dict[str, str | None]:
+        """Read the stored performer genders keyed by the titles.
+
+        :return: The stored performer genders, keyed by the song
+            titles.
+        """
+        session: Session = self.__session()
+        return {x.title: x.performer_gender
+                for x in session.scalars(sa.select(Song))}
+
+    def test_performer_gender_derived(self) -> None:
+        """Test the performer gender of every song: a disagreement
+        gives "mixed" even with an unknown artist, an all-known
+        agreement gives that gender, and an unknown artist otherwise
+        leaves it unset."""
+        self.__write_chart(self.GENDER_CHART_CSV)
+        self.__write_wikidata(self.GENDER_WIKIDATA_CSV)
+        status: int
+        stderr: str
+        status, stderr = self.__run_build(
+            "--wikidata-csv", str(self.__wikidata))
+        self.assertEqual(status, 0)
+        self.assertEqual(
+            self.__performer_genders(),
+            {"Mixed Song": "mixed",
+             "Female Song": "female",
+             "Unknown Song": None,
+             "No Gender Song": None})
+
+    def test_performer_gender_in_songs_csv(self) -> None:
+        """Test that songs.csv mirrors the performer gender, empty
+        when it is unset."""
+        self.__write_chart(self.GENDER_CHART_CSV)
+        self.__write_wikidata(self.GENDER_WIKIDATA_CSV)
+        self.assertEqual(
+            self.__run_build("--wikidata-csv",
+                             str(self.__wikidata))[0], 0)
+        rows: list[list[str]] = self.__read_csv_rows("songs.csv")
+        self.assertEqual(
+            [(row[0], row[3]) for row in rows],
+            [("Female Song", "female"),
+             ("Mixed Song", "mixed"),
+             ("No Gender Song", ""),
+             ("Unknown Song", "")])
+
     def test_first_run_on_fresh_store(self) -> None:
         """Test that a build on a fresh store creates the tables."""
         self.assertEqual(
@@ -727,7 +821,7 @@ class TestBuildDB(unittest.TestCase):
         self.assertEqual(self.__run_build()[0], 0)
         self.assertEqual(
             self.__read_csv_header("songs.csv"),
-            ["Title", "Artists", "Positions"])
+            ["Title", "Artists", "Positions", "Performer Gender"])
         rows: list[list[str]] = self.__read_csv_rows("songs.csv")
         self.assertEqual(
             [row[:2] for row in rows],