feat: database models and Alembic migrations — User, Recording, Transcription, Protocol, PromptTemplate, ExportFile

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/models/export_file.py

@@ -0,0 +1,26 @@
+import enum
+import uuid
+
+from sqlalchemy import BigInteger, Enum, ForeignKey, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.models.base import Base, TimestampMixin, UUIDMixin
+
+
+class ExportFormat(str, enum.Enum):
+    docx = "docx"
+    pdf = "pdf"
+    md = "md"
+
+
+class ExportFile(UUIDMixin, TimestampMixin, Base):
+    __tablename__ = "export_files"
+
+    protocol_id: Mapped[uuid.UUID] = mapped_column(
+        ForeignKey("protocols.id", ondelete="CASCADE")
+    )
+    format: Mapped[ExportFormat] = mapped_column(Enum(ExportFormat))
+    file_path: Mapped[str] = mapped_column(String(1000))
+    file_size: Mapped[int] = mapped_column(BigInteger)
+
+    protocol: Mapped["Protocol"] = relationship(back_populates="export_files")