first commit

backend/app/models/ocr_block.py

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+import uuid
+
+from sqlalchemy import String, Integer, Float, Text, ForeignKey
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.core.database import Base
+
+
+class OcrBlock(Base):
+    __tablename__ = "ocr_blocks"
+
+    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    image_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("evidence_images.id"), index=True)
+    content: Mapped[str] = mapped_column(Text, default="")
+    bbox: Mapped[dict] = mapped_column(JSONB, default=dict)
+    seq_order: Mapped[int] = mapped_column(Integer, default=0)
+    confidence: Mapped[float] = mapped_column(Float, default=0.0)
+
+    image = relationship("EvidenceImage", back_populates="ocr_blocks")