Added archived field to spools

Resolves #13

migrations/README.md

@@ -2,5 +2,6 @@
 
 Creating a new version:
 ```bash
-alembic revision -m "some title" --autogenerate
+python -m spoolman.main
+pdm run alembic revision -m "some title" --autogenerate
 ```

migrations/versions/2023_07_14_1217-92186a5f7b0f_add_spool_archived_field.py

@@ -0,0 +1,24 @@
+"""add spool archived field.
+
+Revision ID: 92186a5f7b0f
+Revises: db385b808a20
+Create Date: 2023-07-14 12:17:13.162618
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "92186a5f7b0f"
+down_revision = "db385b808a20"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Perform the upgrade."""
+    op.add_column("spool", sa.Column("archived", sa.Boolean(), nullable=True))
+
+
+def downgrade() -> None:
+    """Perform the downgrade."""
+    op.drop_column("spool", "archived")