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backend/models/api_key.py

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+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Text
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from database import Base
+import enum
+
+
+class APIKeyScope(str, enum.Enum):
+    READ_PROJECTS = "read:projects"
+    READ_TASKS = "read:tasks"
+    READ_SUBMISSIONS = "read:submissions"
+    READ_USERS = "read:users"
+    WRITE_TASKS = "write:tasks"
+    WRITE_SUBMISSIONS = "write:submissions"
+    ADMIN_USERS = "admin:users"
+    FULL_ACCESS = "full:access"
+
+
+class APIKey(Base):
+    __tablename__ = "api_keys"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    key_hash = Column(String, unique=True, index=True, nullable=False)
+    name = Column(String, nullable=False)
+    scopes = Column(Text, nullable=False)  # JSON string of scopes
+    is_active = Column(Boolean, default=True, nullable=False)
+    expires_at = Column(DateTime(timezone=True), nullable=True)
+    last_used_at = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    # Relationships
+    user = relationship("User", back_populates="api_keys")
+
+    def __repr__(self):
+        return f"<APIKey(id={self.id}, name='{self.name}', user_id={self.user_id})>"