Adding archived flag to augmented parts, fixing migrations so that creation from scratch is successful

app/models/augmented_part.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, String, Text, func
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.core.database import Base
@@ -36,6 +36,10 @@ class AugmentedPart(Base):
         nullable=True,
         default=None,
     )
+    # Set instead of deleting the row when the last backing ImportedPart is
+    # removed, so fit/attachment-point history is preserved. Hidden from list
+    # views by default.
+    archived: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
 
     # linked imported parts — not eagerly loaded; used by sync service only
     imported_parts: Mapped[list[ImportedPart]] = relationship(