Drop migration of "paid" to non-nullable

The DB contains NULLs here, and I'll just leave them be.

app/config.example.py

@@ -2,9 +2,9 @@
 # config
 
 
-class Configuration():
+class Configuration:
     "Haldis configuration object"
-    # pylint: disable=R0903
+    # pylint: disable=too-few-public-methods
     SQLALCHEMY_DATABASE_URI = "sqlite:///haldis.db"
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     DEBUG = True

app/migrations/versions/9159a6fed021_initial_haldis_support.py

@@ -65,7 +65,6 @@ def upgrade():
         sa.PrimaryKeyConstraint("id")
     )
     op.add_column("order_item", sa.Column("hlds_data_version", sa.String(length=40), nullable=True))
-    op.alter_column("order_item", "paid", existing_type=sa.BOOLEAN(), nullable=False)
     op.alter_column("order", "courrier_id", new_column_name="courier_id")
     op.alter_column("order_item", "extra", new_column_name="comment",
                     existing_type=sa.String(254), type_=sa.Text())
@@ -140,7 +139,6 @@ def upgrade():
 def downgrade():
     "Don't use this. It will cripple the data."
 
-    op.alter_column("order_item", "paid", existing_type=sa.Boolean(), nullable=True)
     op.alter_column("order", "courier_id", new_column_name="courrier_id")
     op.alter_column("order_item", "comment", new_column_name="extra",
                     existing_type=sa.Text(), type_=sa.String(254))

app/models/orderitem.py

@@ -16,7 +16,7 @@ class OrderItem(db.Model):
     dish_name = db.Column(db.String(120), nullable=True)
     price = db.Column(db.Integer, nullable=False)
     paid = db.Column(
-        db.Boolean, default=False, nullable=False
+        db.Boolean, default=False, nullable=True
     )
     comment = db.Column(db.Text(), nullable=True)
     hlds_data_version = db.Column(db.String(40), nullable=True)