let product = await pool.query('insert into product values (default, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) returning id', [

							let product = (await pool.query('insert into product values (default, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) returning id', [

							]);

							])).rows[0].id;
							if(Array.isArray(parameters.variants) && parameters.variants.length) {
								let query = 'insert into variant values ';
								let params = [];
								for(let i = 0; i < parameters.variants.length; ++i) {
									if(parameters.variants[i].quantity !== undefined) {
										query += `(default, $${i * 3 + 1}, $${i * 3 + 2}, $${i * 3 + 3}),`;
										params.push(product);
										params.push(parameters.variants[i].portions === undefined ? 0 : Number(parameters.variants[i].portions));
										params.push(Number(parameters.variants[i].quantity));//Number(undefined) -> NaN										
									}
								}
								//console.log(query);
								//console.log(params);
								await pool.query(query.slice(0, -1), params);
							}