harden domain architecture and add lazy Crossref+Unpaywall PDF enrichment with publications workspace refactor

alembic/versions/20260220_0011_add_publication_doi.py

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+"""Add DOI column to publications.
+
+Revision ID: 20260220_0011
+Revises: 20260219_0010
+Create Date: 2026-02-20 13:35:00.000000
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260220_0011"
+down_revision: str | Sequence[str] | None = "20260219_0010"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def _has_column(inspector: sa.Inspector, table_name: str, column_name: str) -> bool:
+    for column in inspector.get_columns(table_name):
+        if str(column.get("name")) == column_name:
+            return True
+    return False
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    table_names = set(inspector.get_table_names())
+    if "publications" not in table_names:
+        return
+    if not _has_column(inspector, "publications", "doi"):
+        op.add_column("publications", sa.Column("doi", sa.String(length=255), nullable=True))
+    index_names = {index["name"] for index in inspector.get_indexes("publications")}
+    if "ix_publications_doi" not in index_names:
+        op.create_index("ix_publications_doi", "publications", ["doi"], unique=False)
+
+
+def downgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    table_names = set(inspector.get_table_names())
+    if "publications" not in table_names:
+        return
+    index_names = {index["name"] for index in inspector.get_indexes("publications")}
+    if "ix_publications_doi" in index_names:
+        op.drop_index("ix_publications_doi", table_name="publications")
+    if _has_column(inspector, "publications", "doi"):
+        op.drop_column("publications", "doi")