Fix reactions in DMs

backend/models.py

@@ -80,6 +80,7 @@ class DMEnvelope(Base):
     reply_to_id = Column(Integer, nullable=True)
     timestamp = Column(DateTime, default=datetime.now)
     files = relationship("DMFile", back_populates="message", cascade="all, delete-orphan", lazy="select")
+    reactions = relationship("DMReaction", cascade="all, delete-orphan", lazy="select")
 
 
 class DMFile(Base):
@@ -123,6 +124,23 @@ class Reaction(Base):
     __table_args__ = (UniqueConstraint('message_id', 'user_id', 'emoji', name='unique_reaction'),)
 
 
+class DMReaction(Base):
+    __tablename__ = "dm_reaction"
+
+    id = Column(Integer, primary_key=True, index=True)
+    dm_envelope_id = Column(Integer, ForeignKey("dm_envelope.id"), nullable=False, index=True)
+    user_id = Column(Integer, ForeignKey("user.id"), nullable=False)
+    emoji = Column(String(10), nullable=False)  # Store emoji as string
+    timestamp = Column(DateTime, default=datetime.now)
+    
+    # Relationships
+    user = relationship("User")
+    dm_envelope = relationship("DMEnvelope")
+    
+    # Ensure unique combination of dm_envelope, user, and emoji
+    __table_args__ = (UniqueConstraint('dm_envelope_id', 'user_id', 'emoji', name='unique_dm_reaction'),)
+
+
 # Pydantic модели
 class LoginRequest(BaseModel):
     username: str
@@ -200,5 +218,22 @@ class ReactionResponse(BaseModel):
         from_attributes = True
 
 
+class DMReactionRequest(BaseModel):
+    dm_envelope_id: int
+    emoji: str
+
+
+class DMReactionResponse(BaseModel):
+    id: int
+    dm_envelope_id: int
+    user_id: int
+    emoji: str
+    timestamp: datetime
+    username: str
+
+    class Config:
+        from_attributes = True
+
+
 # Tables are now created through Alembic migrations
 # Base.metadata.create_all(bind=engine)