SQLAlchemy is not creating certain columns - sqlalchemy

Question

I'm trying to set up a self-referential many-to-many database via an association object (since I need to add a value in the relationship).
I have searched all over Stack Exchange, Google and the SQLAlchemy documentation, but I haven't found a single similar instance.
The model definitions are (Python3.8):
class Recipe(db.Model):
id = db.Column(db.Integer, primary_key=True)
base_id = db.Column(db.Integer, db.ForeignKey('color.id'))
ingredients = db.relationship('Color',
backref='recipe',
cascade='save-update')
quantity = db.Column(db.Integer)
def __init__(self, ingredient, quantity):
print(f'{ingredient=}\n{quantity=}')
self.ingredients = ingredient
self.quantity = quantity
def __repr__(self):
return f'Recipe({self.ingredients} x{self.quantity})'
class Color(db.Model):
id = db.Column(db.Integer, primary_key=True)
medium = db.Column(db.String(2), nullable=False)
name = db.Column(db.String(50), nullable=False, unique=True)
pure = db.Column(db.Boolean, default=False, nullable=False)
_recipe = db.relationship(Recipe,
primaryjoin=id==Recipe.base_id,
join_depth=1)
recipe = association_proxy('_recipe', 'ingredients',
creator = lambda _: _)
swatch = db.Column(db.String(25), nullable=False, unique=True)
def __init__(self, medium, name, pure, *, recipe=None, swatch):
self.medium = medium.upper()
self.name = name
self.pure = pure
self.swatch = swatch
if self.pure:
self.recipe = [Recipe(self, 1)]
else:
for ingredient, quantity in recipe:
self.recipe.append(Recipe(ingredient, quantity))
def __repr__(self):
return f'Color({self.name})'
I am using a SQLite database.
I would expect to have a column for each attribute in both tables, but for some reason, this is the only table creation SQL generated:
CREATE TABLE color (
id INTEGER NOT NULL,
medium VARCHAR(2) NOT NULL,
name VARCHAR(50) NOT NULL,
pure BOOLEAN NOT NULL,
swatch VARCHAR(25) NOT NULL,
PRIMARY KEY (id),
UNIQUE (name),
CHECK (pure IN (0, 1)),
UNIQUE (swatch)
)
CREATE TABLE recipe (
id INTEGER NOT NULL,
base_id INTEGER,
quantity INTEGER,
PRIMARY KEY (id),
FOREIGN KEY(base_id) REFERENCES color (id)
)
I am receiving no errors. If I use the cli to manually input records, all defined columns save, though not entirely correctly. I think that may be due to the missing columns, though, and will post it as a separate issue if needed, later.