added chat history

web/backend/app/models/__init__.py

@@ -54,6 +54,9 @@ class Project(Base):
     designator_mappings: Mapped[list[DesignatorMapping]] = relationship(
         back_populates="project", cascade="all, delete-orphan"
     )
+    llm_chats: Mapped[list[LlmChat]] = relationship(
+        back_populates="project", cascade="all, delete-orphan"
+    )
     llm_messages: Mapped[list[LlmMessage]] = relationship(
         back_populates="project", cascade="all, delete-orphan"
     )
@@ -304,11 +307,32 @@ class SimpleListRow(Base):
     is_empty: Mapped[bool] = mapped_column(Boolean, default=False)
 
 
+class LlmChat(Base):
+    __tablename__ = "llm_chats"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    project_id: Mapped[int] = mapped_column(ForeignKey("projects.id", ondelete="CASCADE"), index=True)
+    title: Mapped[str] = mapped_column(String(255), default="Новый чат")
+    table_type: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+
+    project: Mapped[Project] = relationship(back_populates="llm_chats")
+    messages: Mapped[list[LlmMessage]] = relationship(
+        back_populates="chat", cascade="all, delete-orphan", order_by="LlmMessage.id"
+    )
+
+
 class LlmMessage(Base):
     __tablename__ = "llm_messages"
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
     project_id: Mapped[int] = mapped_column(ForeignKey("projects.id", ondelete="CASCADE"), index=True)
+    chat_id: Mapped[Optional[int]] = mapped_column(
+        ForeignKey("llm_chats.id", ondelete="CASCADE"), index=True, nullable=True
+    )
     role: Mapped[str] = mapped_column(String(32), nullable=False)
     content: Mapped[str] = mapped_column(Text, default="")
     table_type: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
@@ -316,3 +340,4 @@ class LlmMessage(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
 
     project: Mapped[Project] = relationship(back_populates="llm_messages")
+    chat: Mapped[Optional[LlmChat]] = relationship(back_populates="messages")