Initial commit with Phase 0 Scaffolding

backend/app/models/document.py

@@ -0,0 +1,58 @@
+"""Document model — uploaded PDFs with soft-delete support."""
+
+import uuid
+from datetime import datetime, timezone
+
+from sqlalchemy import Index, Integer, Text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.db import Base
+
+
+def _uuid() -> str:
+    return str(uuid.uuid4())
+
+
+def _now_iso() -> str:
+    return datetime.now(timezone.utc).isoformat()
+
+
+class Document(Base):
+    """
+    A single uploaded PDF document.
+
+    Supports soft deletion via `deleted_at` — when set, the document
+    is in the trash and can be restored or permanently purged.
+    """
+
+    __tablename__ = "documents"
+
+    id: Mapped[str] = mapped_column(Text, primary_key=True, default=_uuid)
+    title: Mapped[str] = mapped_column(Text, nullable=False)
+    original_filename: Mapped[str] = mapped_column(Text, nullable=False)
+    file_path: Mapped[str] = mapped_column(Text, nullable=False)
+    thumbnail_path: Mapped[str | None] = mapped_column(Text, nullable=True, default=None)
+    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
+    page_count: Mapped[int] = mapped_column(Integer, nullable=False)
+    created_at: Mapped[str] = mapped_column(Text, default=_now_iso)
+    updated_at: Mapped[str] = mapped_column(Text, default=_now_iso, onupdate=_now_iso)
+    deleted_at: Mapped[str | None] = mapped_column(Text, nullable=True, default=None)
+
+    # Relationships
+    annotation_state: Mapped["AnnotationState"] = relationship(
+        "AnnotationState",
+        back_populates="document",
+        uselist=False,
+        cascade="all, delete-orphan",
+    )
+    versions: Mapped[list["Version"]] = relationship(
+        "Version",
+        back_populates="document",
+        cascade="all, delete-orphan",
+        order_by="Version.created_at.desc()",
+    )
+
+    __table_args__ = (
+        Index("ix_documents_updated_at", "updated_at"),
+        Index("ix_documents_deleted_at", "deleted_at"),
+    )