diff --git a/models/deal.py b/models/deal.py
index 02568f6..6e3258c 100644
--- a/models/deal.py
+++ b/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",
diff --git a/models/mixins.py b/models/mixins.py
index 6e434a3..e87006b 100644
--- a/models/mixins.py
+++ b/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,
     )
 
 
diff --git a/models/project.py b/models/project.py
index 142da56..708062d 100644
--- a/models/project.py
+++ b/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",
diff --git a/models/status.py b/models/status.py
index 70b5f70..a57ac5d 100644
--- a/models/status.py
+++ b/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(
diff --git a/modules/clients/models/client.py b/modules/clients/models/client.py
index 032b0ef..4cc936c 100644
--- a/modules/clients/models/client.py
+++ b/modules/clients/models/client.py
@@ -1,4 +1,3 @@
-from datetime import datetime
 from typing import Optional, TYPE_CHECKING
 
 from sqlalchemy import ForeignKey
@@ -16,10 +15,7 @@ class Client(BaseModel, IdMixin, CreatedAtMixin, SoftDeleteMixin):
 
     name: Mapped[str] = mapped_column(unique=True, comment="Название клиента")
 
-    company_name: Mapped[str] = mapped_column(
-        nullable=False,
-        comment="Название компании",
-    )
+    company_name: Mapped[str] = mapped_column(comment="Название компании")
 
     products: Mapped[list["Product"]] = relationship(
         back_populates="client", lazy="noload"
diff --git a/modules/fulfillment_base/models/product.py b/modules/fulfillment_base/models/product.py
index eb4fa8a..9d37c9b 100644
--- a/modules/fulfillment_base/models/product.py
+++ b/modules/fulfillment_base/models/product.py
@@ -62,4 +62,4 @@ class ProductImage(BaseModel, IdMixin):
     product_id: Mapped[int] = mapped_column(ForeignKey("fulfillment_base_products.id"))
     product: Mapped["Product"] = relationship(back_populates="images")
 
-    image_url: Mapped[str] = mapped_column(nullable=False)
+    image_url: Mapped[str] = mapped_column()
diff --git a/repositories/mixins.py b/repositories/mixins.py
index 659e66e..d748fa2 100644
--- a/repositories/mixins.py
+++ b/repositories/mixins.py
@@ -50,7 +50,7 @@ class RepCreateMixin(Generic[EntityType, CreateSchemaType], RepBaseMixin[EntityT
         prepared_data = await self._prepare_create(data)
         obj = self.entity_class(**prepared_data)
         self.session.add(obj)
-        await self.session.flash()
+        await self.session.flush()
         await self.session.refresh(obj)
         await self._after_create(obj, data)
         await self.session.commit()