diff --git a/dg_osm/db/models.py b/dg_osm/db/models.py
index a32fabf..34527f2 100644
--- a/dg_osm/db/models.py
+++ b/dg_osm/db/models.py
@@ -1,4 +1,4 @@
-from typing import Optional, List
+from typing import Optional
 
 from sqlalchemy import Boolean, ForeignKey, String
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
@@ -17,7 +17,7 @@ class MailServer(Base):
     # TODO: do not store password in plain text in the db! Ideally nor the username.
     username: Mapped[str] = mapped_column(String(255))
     password: Mapped[str] = mapped_column(String(255))
-    messages: Mapped[List['Message']] = relationship(back_populates='mail_server', cascade='all, delete-orphan')
+    messages: Mapped[list['Message']] = relationship(back_populates='mail_server', cascade='all, delete-orphan')
 
 
 class ContactList(Base):
@@ -29,15 +29,15 @@ class ContactList(Base):
     short_name: Mapped[str] = mapped_column(String(20))
     full_name: Mapped[str] = mapped_column(String(255))
     email_address: Mapped[str] = mapped_column(String(255))
-    contact_lists_test: Mapped[List['Message']] = relationship(back_populates='contact_list', cascade='all, delete-orphan')
-    contact_lists_live: Mapped[List['Message']] = relationship(back_populates='contact_list', cascade='all, delete-orphan')
+    contact_lists_test: Mapped[list['Message']] = relationship(back_populates='contact_list', cascade='all, delete-orphan')
+    contact_lists_live: Mapped[list['Message']] = relationship(back_populates='contact_list', cascade='all, delete-orphan')
 
 
 class Message(Base):
     __tablename__ = 'message'
     id: Mapped[int] = mapped_column(primary_key=True)
     description: Mapped[str] = mapped_column(String(255))
-    notes: Mapped[[Optional[str]]]
+    notes: Mapped[Optional[str]]
     is_complete: Mapped[bool] = mapped_column(Boolean, default=False)
     mail_server_id: Mapped[int] = mapped_column(ForeignKey('mail_server.id'))
     mail_server: Mapped['MailServer'] = relationship(back_populates='messages')