diff --git a/python/orm/richie/audiobook.py b/python/orm/richie/audiobook.py
index 0b8d6d4..00ead7b 100644
--- a/python/orm/richie/audiobook.py
+++ b/python/orm/richie/audiobook.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from sqlalchemy import ForeignKey, String, UniqueConstraint
+from sqlalchemy import ForeignKey, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from python.orm.richie.base import TableBase
@@ -14,7 +14,7 @@ class AudiobookAuthor(TableBase):
     __tablename__ = "audiobook_author"
     __table_args__ = (UniqueConstraint("name"),)
 
-    name: Mapped[str] = mapped_column(String, unique=True)
+    name: Mapped[str]
 
     books: Mapped[list[Audiobook]] = relationship("Audiobook", back_populates="author")
     series: Mapped[list[AudiobookSeries]] = relationship("AudiobookSeries", back_populates="author")
@@ -26,7 +26,7 @@ class AudiobookSeries(TableBase):
     __tablename__ = "audiobook_series"
     __table_args__ = (UniqueConstraint("author_id", "name"),)
 
-    name: Mapped[str] = mapped_column(String)
+    name: Mapped[str]
     author_id: Mapped[int] = mapped_column(ForeignKey("main.audiobook_author.id", ondelete="CASCADE"))
 
     author: Mapped[AudiobookAuthor] = relationship("AudiobookAuthor", back_populates="series")
@@ -46,7 +46,7 @@ class Audiobook(TableBase):
         ),
     )
 
-    title: Mapped[str] = mapped_column(String)
+    title: Mapped[str]
     author_id: Mapped[int] = mapped_column(ForeignKey("main.audiobook_author.id", ondelete="CASCADE"))
     series_id: Mapped[int | None] = mapped_column(ForeignKey("main.audiobook_series.id", ondelete="SET NULL"))
     series_index: Mapped[float] = mapped_column(default=0.0)