refactor: removed nullable in models

models/deal.py

@@ -14,20 +14,19 @@ if TYPE_CHECKING:
 class Deal(BaseModel, IdMixin, SoftDeleteMixin, CreatedAtMixin):
     __tablename__ = "deals"
 
-    name: Mapped[str] = mapped_column(nullable=False)
-    lexorank: Mapped[str] = mapped_column(nullable=False)
+    name: Mapped[str] = mapped_column()
+    lexorank: Mapped[str] = mapped_column()
 
     status_id: Mapped[int] = mapped_column(
         ForeignKey("statuses.id"),
-        nullable=False,
         comment="Текущий статус",
     )
     status: Mapped["Status"] = relationship()
 
-    board_id: Mapped[int] = mapped_column(
-        ForeignKey("boards.id"), nullable=True, server_default="1"
+    board_id: Mapped[Optional[int]] = mapped_column(
+        ForeignKey("boards.id"), server_default="1"
     )
-    board: Mapped["Board"] = relationship(back_populates="deals")
+    board: Mapped[Optional["Board"]] = relationship(back_populates="deals")
 
     status_history: Mapped[list["DealStatusHistory"]] = relationship(
         back_populates="deal",

models/mixins.py

@@ -9,17 +9,13 @@ class IdMixin:
 
 
 class SoftDeleteMixin:
-    is_deleted: Mapped[bool] = mapped_column(
-        default=False,
-        nullable=False,
-    )
+    is_deleted: Mapped[bool] = mapped_column(default=False)
 
 
 class CreatedAtMixin:
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True),
         default=lambda: datetime.now(timezone.utc),
-        nullable=False,
     )
 
 
@@ -27,7 +23,6 @@ class LastModifiedAtMixin:
     last_modified_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True),
         default=lambda: datetime.now(timezone.utc),
-        nullable=False,
     )
 
 

models/project.py

@@ -12,7 +12,7 @@ if TYPE_CHECKING:
 class Project(BaseModel, IdMixin, SoftDeleteMixin, CreatedAtMixin):
     __tablename__ = "projects"
 
-    name: Mapped[str] = mapped_column(nullable=False)
+    name: Mapped[str] = mapped_column()
 
     boards: Mapped[list["Board"]] = relationship(
         back_populates="project",

models/status.py

@@ -13,22 +13,21 @@ if TYPE_CHECKING:
 class Status(BaseModel, IdMixin, SoftDeleteMixin):
     __tablename__ = "statuses"
 
-    name: Mapped[str] = mapped_column(nullable=False)
-    lexorank: Mapped[str] = mapped_column(nullable=False)
+    name: Mapped[str] = mapped_column()
+    lexorank: Mapped[str] = mapped_column()
 
-    board_id: Mapped[int] = mapped_column(ForeignKey("boards.id"), nullable=False)
+    board_id: Mapped[int] = mapped_column(ForeignKey("boards.id"))
     board: Mapped["Board"] = relationship(back_populates="statuses")
 
 
 class DealStatusHistory(BaseModel, IdMixin, CreatedAtMixin):
     __tablename__ = "status_history"
 
-    deal_id: Mapped[int] = mapped_column(ForeignKey("deals.id"), nullable=False)
+    deal_id: Mapped[int] = mapped_column(ForeignKey("deals.id"))
     deal: Mapped["Deal"] = relationship(back_populates="status_history")
 
     from_status_id: Mapped[int] = mapped_column(
         ForeignKey("statuses.id"),
-        nullable=False,
         comment="Старый статус",
     )
     from_status: Mapped[Status] = relationship(
@@ -38,7 +37,6 @@ class DealStatusHistory(BaseModel, IdMixin, CreatedAtMixin):
 
     to_status_id: Mapped[int] = mapped_column(
         ForeignKey("statuses.id"),
-        nullable=False,
         comment="Новый статус",
     )
     to_status: Mapped[Status] = relationship(