#3621 refactor: Fix MRO of `schema` stream attribute Pull request opened by edgarrmondragon on <!date^1778039446^{date_short}|2026-05-06T03:50:46Z> Summary by Sourcery Refactor stream schema handling to use a descriptor-based

StreamSchema

on the base

Stream

class and fix method resolution order so schema access works consistently for instances and subclasses. New Features: • Introduce a class-level

schema

descriptor on

Stream

backed by

StreamSchema

and a fallback instance schema descriptor. Bug Fixes: • Ensure the

schema

attribute on streams correctly resolves via MRO and falls back to instance-level schema when no class-level schema is defined. • Prevent accidental mutation of stream schema by making the

schema

descriptor read-only on instances and raising an error if no schema source is configured. Enhancements: • Add type-safe overloads and

Self

typing to the

StreamSchema

descriptor for better static type checking. • Improve error messages when schemas are missing for streams or when no schema source is configured. • Simplify SQLStream and filesystem stream schema access by relying on the unified descriptor mechanism instead of custom properties. meltano/sdk