Prepare ERP source for Gitea deployment

alembic/versions/20260419_client_portal_user_link.py

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+from alembic import op
+import sqlalchemy as sa
+
+revision = "20260419_client_portal_user_link"
+down_revision = "20260416_release_b6_cleanup"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    with op.batch_alter_table("clients") as batch_op:
+        batch_op.add_column(sa.Column("portal_user_id", sa.Integer(), nullable=True))
+        batch_op.create_index("ix_clients_portal_user_id", ["portal_user_id"], unique=False)
+        batch_op.create_foreign_key("fk_clients_portal_user_id_users", "users", ["portal_user_id"], ["id"])
+
+
+def downgrade():
+    with op.batch_alter_table("clients") as batch_op:
+        batch_op.drop_constraint("fk_clients_portal_user_id_users", type_="foreignkey")
+        batch_op.drop_index("ix_clients_portal_user_id")
+        batch_op.drop_column("portal_user_id")