I have updated the Stable Interface Policy according to the discusstion at
The diff is here:
Am 28.10.2016 um 17:59 schrieb Daniel Kinzler:
I plan to add the wikibase (SQL) database schema as a stable interface.
Typically, a database schema is considered internal, but since we have tools on
labs that may rely on the current schema, breaking changes to the schema should
be announced as such. To address this, I plan to add the following paragraph to
the Stable Public APIs section:
The database schema as exposed on Wikimedia Labs is considered a stable
interface. Changes to the available tables and fields are subject to the
above notification policy.
In addition, I plan to add the following paragraph to the Extensibility section:
In a tabular data representation, such as a relational database schema, the
addition of fields is not considered a breaking change. Any change to the
interpretation of a field, as well as the removal of fields, are considered
breaking. Changes to existing unique indexes or primary keys are breaking
changes; changes to other indexes as well as the addition of new unique
indexes are not breaking changes.
If you have any thoughts ob objections, please let me know at
Senior Software Developer
Gesellschaft zur Förderung Freien Wissens e.V.