Implement basic reactions

backend/models.py

@@ -1,5 +1,5 @@
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, inspect, null, text
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, inspect, null, text, UniqueConstraint
 from sqlalchemy.orm import relationship
 from datetime import datetime
 from pydantic import BaseModel
@@ -36,6 +36,7 @@ class Message(Base):
     author = relationship("User", back_populates="messages")
     reply_to = relationship("Message", remote_side=[id])
     files = relationship("MessageFile", back_populates="message", cascade="all, delete-orphan", lazy="select")
+    reactions = relationship("Reaction", cascade="all, delete-orphan", lazy="select")
 
 
 class MessageFile(Base):
@@ -106,6 +107,22 @@ class PushSubscription(Base):
     updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
 
 
+class Reaction(Base):
+    __tablename__ = "reaction"
+
+    id = Column(Integer, primary_key=True, index=True)
+    message_id = Column(Integer, ForeignKey("message.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")
+    
+    # Ensure unique combination of message, user, and emoji
+    __table_args__ = (UniqueConstraint('message_id', 'user_id', 'emoji', name='unique_reaction'),)
+
+
 # Pydantic модели
 class LoginRequest(BaseModel):
     username: str
@@ -166,5 +183,22 @@ class MessageResponse(BaseModel):
         from_attributes = True
 
 
+class ReactionRequest(BaseModel):
+    message_id: int
+    emoji: str
+
+
+class ReactionResponse(BaseModel):
+    id: int
+    message_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)