first commit

backend/app/models/evidence_image.py

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+import uuid
+from datetime import datetime
+import enum
+
+from sqlalchemy import String, Integer, 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 SourceApp(str, enum.Enum):
+    wechat = "wechat"
+    alipay = "alipay"
+    bank = "bank"
+    digital_wallet = "digital_wallet"
+    other = "other"
+
+
+class PageType(str, enum.Enum):
+    bill_list = "bill_list"
+    bill_detail = "bill_detail"
+    transfer_receipt = "transfer_receipt"
+    sms_notice = "sms_notice"
+    balance = "balance"
+    unknown = "unknown"
+
+
+class OcrStatus(str, enum.Enum):
+    pending = "pending"
+    processing = "processing"
+    done = "done"
+    failed = "failed"
+
+
+class EvidenceImage(Base):
+    __tablename__ = "evidence_images"
+
+    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)
+    file_path: Mapped[str] = mapped_column(String(512))
+    thumb_path: Mapped[str] = mapped_column(String(512), default="")
+    source_app: Mapped[SourceApp] = mapped_column(SAEnum(SourceApp), default=SourceApp.other)
+    page_type: Mapped[PageType] = mapped_column(SAEnum(PageType), default=PageType.unknown)
+    ocr_status: Mapped[OcrStatus] = mapped_column(SAEnum(OcrStatus), default=OcrStatus.pending)
+    file_hash: Mapped[str] = mapped_column(String(128), unique=True, index=True)
+    file_size: Mapped[int] = mapped_column(Integer, default=0)
+    uploaded_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+
+    case = relationship("Case", back_populates="images")
+    ocr_blocks = relationship("OcrBlock", back_populates="image", lazy="selectin")