feat(api): add database models

api/app/models/joke.py

@@ -0,0 +1,25 @@
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+
+from app.database import Base
+
+
+class Joke(Base):
+    """笑话表模型"""
+    __tablename__ = "jokes"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    title = Column(String(200), nullable=False)
+    content = Column(Text, nullable=False)
+    type_id = Column(Integer, ForeignKey("joke_types.id"), nullable=True)
+    crowd_id = Column(Integer, ForeignKey("joke_crowds.id"), nullable=True)
+    status = Column(String(20), default="pending")
+    view_count = Column(Integer, default=0)
+    like_count = Column(Integer, default=0)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
+
+    # Relationships
+    type = relationship("JokeType", back_populates="jokes")
+    crowd = relationship("JokeCrowd", back_populates="jokes")