Add DOI column to welearn_document for enhanced document identification

Author: lpi-tn

welearn_database/alembic/versions/f1ce0ad2845b_add_doi_column_to_document.py

@@ -0,0 +1,30 @@
+"""add doi column to document
+
+Revision ID: f1ce0ad2845b
+Revises: f8602200fa99
+Create Date: 2026-04-29 15:39:51.079086
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "f1ce0ad2845b"
+down_revision: Union[str, None] = "b049924f7067"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "welearn_document",
+        sa.Column("doi", sa.String(), nullable=True, unique=True),
+        schema="document_related",
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("welearn_document", "doi", schema="document_related")