first commit

backend/app/models/assessment.py

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+import uuid
+from datetime import datetime
+import enum
+
+from sqlalchemy import String, Numeric, Text, DateTime, ForeignKey, Enum as SAEnum, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class ConfidenceLevel(str, enum.Enum):
+    high = "high"
+    medium = "medium"
+    low = "low"
+
+
+class ReviewStatus(str, enum.Enum):
+    pending = "pending"
+    confirmed = "confirmed"
+    rejected = "rejected"
+    needs_info = "needs_info"
+
+
+class FraudAssessment(Base):
+    __tablename__ = "fraud_assessments"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    case_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("cases.id"), index=True)
+    transaction_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("transaction_records.id"))
+    confidence_level: Mapped[ConfidenceLevel] = mapped_column(SAEnum(ConfidenceLevel))
+    assessed_amount: Mapped[float] = mapped_column(Numeric(14, 2), default=0)
+    reason: Mapped[str] = mapped_column(Text, default="")
+    exclude_reason: Mapped[str] = mapped_column(Text, default="")
+    review_status: Mapped[ReviewStatus] = mapped_column(SAEnum(ReviewStatus), default=ReviewStatus.pending)
+    review_note: Mapped[str] = mapped_column(Text, default="")
+    reviewed_by: Mapped[str] = mapped_column(String(128), default="")
+    reviewed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+
+    case = relationship("Case", back_populates="assessments")
+    transaction = relationship("TransactionRecord")