Introduce Recency Bias (#592)

backend/alembic/versions/ffc707a226b4_basic_document_metadata.py

@@ -0,0 +1,37 @@
+"""Basic Document Metadata
+
+Revision ID: ffc707a226b4
+Revises: 30c1d5744104
+Create Date: 2023-10-18 16:52:25.967592
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = "ffc707a226b4"
+down_revision = "30c1d5744104"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "document",
+        sa.Column("doc_updated_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.add_column(
+        "document",
+        sa.Column("primary_owners", postgresql.ARRAY(sa.String()), nullable=True),
+    )
+    op.add_column(
+        "document",
+        sa.Column("secondary_owners", postgresql.ARRAY(sa.String()), nullable=True),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("document", "secondary_owners")
+    op.drop_column("document", "primary_owners")
+    op.drop_column("document", "doc_updated_at")