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- Remove PostgreSQL-specific server_default from User.email_inbound_token. The column has a Python-side default (secrets.token_urlsafe) that works for both SQLite and PostgreSQL. The gen_random_bytes() server_default caused sqlite table creation to fail. - Add missing back_populates relationships to stub models so SQLAlchemy mapper configuration succeeds. Purchase.user and Store.user_accounts were missing, causing "has no property" errors during Base.metadata.create_all. - Auto-fix ruff import sorting (I001) across all source and test files. - Manually fix line-too-long (E501) in config.py. Co-Authored-By: Paperclip <noreply@paperclip.ing>