<prompt> Tengeneza hati ya Python inayounganishwa na hifadhidata ya PostgreSQL na kufanya shughuli za kimsingi za CRUD kwenye jedwali linaloitwa bidhaa lenye safu wima: kitambulisho, jina, bei, na wingi. Tumia SQLAlchemy kama maktaba ya ORM.PLINFORMAT  <response>: kutoka sqlalchemy import create_engine, Column, Integer, String, Floatkutoka sqlalchemy.ext.declarative import declarative_basekutoka sqlalchemy.orm import sessionmaker Bainisha darasa la Bidhaa kulingana na jedwali la bidhaaMsingi declarative_baseBidhaa ya darasa Msingi: __tablename__ bidhaa id Safu wimaNambari kamili, ufunguo_msingiKweli jina Safu wima Kamba bei Safu Kuelea wingi Safu wima Nambari kamili def __repr__binafsi: return f Unganisha kwenye hifadhidata ya PostgreSQLinjini Unda jedwali la bidhaa ikiwa haipoKikao mtayarishaji kikaobindinjinikikao Kikao Ingiza bidhaa mpya Undanew_product BidhaajinaSampuli ya Bidhaa, bei9.99, wingi10kipindi.ongezabidhaa_mpyakikao.commit Swali bidhaa zote Somaall_products session.queryBidhaa.allchapa Bidhaa zote:, bidhaa_zote Sasisha bidhaaproduct_to_update session.queryProduct.filter_bynameSample Product. kwanzaikiwa bidhaa_ya_kusasisha: product_to_update.bei 12.99 kikao.commitFuta bidhaaproduct_to_delete session.queryProduct.filter_bynameSample Product.kwanzaikiwa product_to_delete: session.deletebidhaa_ya_kufuta kikao.commit Funga kipindikipindi.funga 