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Event:Query Service Days 2026

From Wikidata
Participation optionsOnline event
Start and end time17:00, 17 October 2026 – 20:00, 23 October 2026
Timezone: +00:00
Number of participants88 participants
More detailsRegister for event
Wikidata WikiProjects Days, 19-21 June 2026


This page is currently a work in progress and will be updated in the upcoming weeks. Please do not mark it for translation yet.
Welcome!
The Query Service Days 2026 is an online event focusing on the migration of the Wikidata Query Service from Blazegraph to QLever, and supporting the Wikidata community, tool maintainers and data reusers with adapting their queries and tools to the new endpoint. This event is run in collaboration with the Wikidata team at Wikimedia Deutschland and the Wikidata Platform team at WMF, and aims to ensure that everyone using the Query Service is informed about the next steps and has a space to test the new systems, ask questions, and get support to adapt their queries.
How does it work?
The event is taking place online during one week, from October 17th to 23rd, 2026. You will be able to join sessions live, or to watch the replay later on. You will find the schedule below on this page. The sessions take place in English, and are open to everyone using the Wikidata Query Service, regardless of their level of knowledge of SPARQL.
Register to the event
We encourage you to sign up to the event on this page to receive updates and access links. In order to register, you need to be logged in with your Wikimedia account, and click on the "register for event" button at the top of this page.
Program
The event schedule is currently under construction and will be updated on this page in the upcoming weeks. It mostly consists in presentations of the migration plan with Q&As and hands-on sessions so every type of data user can learn how to update their queries and prepare for the migration with confidence. Although there is no "call for proposals" for this event, if you have a suggestion of session that you would like to facilitate in the program, feel free to contact Mohammed Abdulai (WMDE) or Sannita (WMF).
Code of conduct
Please note that the entire initiative, including the presentations and discussions on various channels, is covered by the Code of Conduct for technical spaces. Please contribute in making the discussion spaces safe and welcoming for everyone.
Discussions and help
If you have questions or suggestions about the event, feel free to use the talk page. Announcements about the event are talking place on the same talk page, and on the Wikidata Telegram group. If you want to reach out to the organizers directly, feel free to contact Mohammed Abdulai (WMDE) or Sannita (WMF).

Sessions

[edit]
We are still working on the program and some changes may occur in the upcoming days. The access link to the online event is available to people who register to the event.

Saturday, October 17th

[edit]

UTC 16:00
CEST 18:00
NZT 5:00
Your time zone

⏱️ 50 minutes

🎤
Opening session + overview of what the migration will mean for you as an editor

Wikidata Query Service is migrating from Blazegraph to QLever. In this session we will give an overview of why we are switching, what is changing, the timelines and what is coming next.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work and might not be very proficient in SparQL.

Speaker(s): Lydia Pintscher (WMDE), BTracy-WMF

UTC 17:00
CEST 19:00
NZT 6:00
Your time zone

⏱️ 50 minutes

🎤
Rewriting queries: Which queries need adapting and what resources are available to help you

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will look at cases that need rewriting and show tools available to help you adapt queries.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work.

Speaker(s): BTracy-WMF, GModena (WMF)

UTC 18:00
CEST 20:00
NZT 7:00
Your time zone

⏱️ 50 minutes

🛠️
Rewriting queries: Let’s adapt some queries together (basic maintenance queries)

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work.

Speaker(s): BTracy-WMF, GModena (WMF)

UTC 19:00
CEST 21:00
NZT 8:00
Your time zone

⏱️ 50 minutes

🎉
Wikidata games & socializing

Let's play some Wikidata-powered games together!


Facilitation: Lydia Pintscher (WMDE)

Sunday, October 18th

[edit]

UTC 9:00
CEST 11:00
NZT 22:00
Your time zone

⏱️ 50 minutes

⏯️
[replay] Opening session + overview of what the migration will mean for you as an editor

Wikidata Query Service is migrating from Blazegraph to QLever. In this session we will give an overview of why we are switching, what is changing, the timelines and what is coming next.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work and might not be very proficient in SparQL.

Speaker(s): Lydia Pintscher (WMDE), BTracy-WMF

UTC 10:00
CEST 12:00
NZT 23:00
Your time zone

⏱️ 50 minutes

⏯️
[replay] Rewriting queries: Which queries need adapting and what resources are available to help you

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will look at cases that need rewriting and show tools available to help you adapt queries.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work.

Speaker(s): BTracy-WMF, GModena (WMF)

UTC 11:00
CEST 13:00
NZT 0:00
Your time zone

⏱️ 50 minutes

⏯️
[replay] Rewriting queries: Let’s adapt some queries together (basic maintenance queries)

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work.

Speaker(s): BTracy-WMF, GModena (WMF)

Monday, October 19th

[edit]

UTC 7:00
CEST 9:00
NZT 20:00
Your time zone

⏱️ 50 minutes

🎤
Overview of what the migration will mean for you as a tool maintainer or reusers

Wikidata Query Service is migrating from Blazegraph to QLever. In this session we will give an overview of why we are switching, what is changing, the timelines and what is coming next.

This session is especially for tool builders and reusers who are using Wikidata Query Service as part of their applications.

Speaker(s): Lydia Pintscher (WMDE), BTracy-WMF

UTC 8:00
CEST 10:00
NZT 21:00
Your time zone

⏱️ 25 minutes

🎤
Query Service, REST, GraphQL, dumps, ...: What to use to for my use?

The migration from Blazegraph to QLever is a good point in time to consider if you are using the best access method for your usecase. Should you adapt your queries or maybe switch to one of the other data access method Wikidata provides? In this session you will get an overview of the different access methods and what is best for your use case.

This session is especially for tool builders and reusers who are using Wikidata Query Service as part of their applications.

Speaker(s): Ifrahkhanyaree WMDE

UTC 8:30
CEST 10:30
NZT 21:30
Your time zone

⏱️ 25 minutes

🎤
How we prepared our tool for the Query Service migration

A few pioneers have already made the switch to the new QLever-powered Query Service. In this session they will talk about their migration experience.

Speaker(s): Andrew McAllister (Scribe)

UTC 9:00
CEST 11:00
NZT 22:00
Your time zone

⏱️ 50 minutes

🛠️
Rewriting queries: Let’s adapt some queries together

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.


Facilitation: BTracy-WMF

Tuesday, October 20th

[edit]

UTC 16:00
CEST 18:00
NZT 5:00
Your time zone

⏱️ 50 minutes

⏯️
[replay] Overview of what the migration will mean for you as a tool maintainer or reusers

Wikidata Query Service is migrating from Blazegraph to QLever. In this session we will give an overview of why we are switching, what is changing, the timelines and what is coming next.

This session is especially for tool builders and reusers who are using Wikidata Query Service as part of their applications.

Speaker(s): Lydia Pintscher (WMDE), BTracy-WMF

UTC 17:00
CEST 19:00
NZT 6:00
Your time zone

⏱️ 25 minutes

⏯️
[replay] Query Service, REST, GraphQL, dumps, ...: What to use to for my use?

The migration from Blazegraph to QLever is a good point in time to consider if you are using the best access method for your usecase. Should you adapt your queries or maybe switch to one of the other data access method Wikidata provides? In this session you will get an overview of the different access methods and what is best for your use case.

This session is especially for tool builders and reusers who are using Wikidata Query Service as part of their applications.

Speaker(s): Ifrahkhanyaree WMDE

UTC 17:30
CEST 19:30
NZT 6:30
Your time zone

⏱️ 25 minutes

⏯️
[replay] How we prepared our tool for the Query Service migration

A few pioneers have already made the switch to the new QLever-powered Query Service. In this session they will talk about their migration experience.

Speaker(s): Andrew McAllister (Scribe)

UTC 18:00
CEST 20:00
NZT 7:00
Your time zone

⏱️ 50 minutes

🛠️
Rewriting queries: Let’s adapt some queries together

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.

This session is especially for tool builders and reusers who are using Wikidata Query Service as part of their applications.

Speaker(s): Lucas Werkmeister (WMDE)

Wednesday, October 21st

[edit]

UTC 8:00
CEST 10:00
NZT 21:00
Your time zone

⏱️ 50 minutes

🛠️
Rewriting queries: Let’s adapt some queries together (basic maintenance queries)

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work and might not be very proficient in SparQL.

Speaker(s): BTracy-WMF, Lucas Werkmeister (WMDE)

UTC 9:00
CEST 11:00
NZT 22:00
Your time zone

⏱️ 50 minutes

🛠️
Advanced queries self-help group

We will come together and try to figure out some of the harder migration cases together.


Facilitation: BTracy-WMF

Thursday, October 22nd

[edit]

UTC 8:00
CEST 10:00
NZT 21:00
Your time zone

⏱️ 50 minutes

📋
Bug Triage Hour

Bring the Phabricator tickets you really care about and we will improve it together to move it forward.


Facilitation: Lydia Pintscher (WMDE), BTracy-WMF

UTC 9:00
CEST 11:00
NZT 22:00
Your time zone

⏱️ 50 minutes

🎉
Wikidata games & socializing

Let's play some Wikidata-powered games together!


Facilitation: Lydia Pintscher (WMDE)

Later during the day...

UTC 16:00
CEST 18:00
NZT 5:00
Your time zone

⏱️ 50 minutes

🛠️
Rewriting queries: let’s rewrite some queries together + show the new endpoint (simple maintenance queries)

Some queries will need to be adapted as part of the migration from Blazegraph to QLever. In this session we will adapt some queries together.

This session is especially for editors who are using Wikidata Query Service as part of their day-to-day work and might not be very proficient in SparQL.

Speaker(s): BTracy-WMF

UTC 17:00
CEST 19:00
NZT 6:00
Your time zone

⏱️ 50 minutes

🛠️
Advanced queries self-help group

We will come together and try to figure out some of the harder migration cases together.


Facilitation: BTracy-WMF

UTC 18:00
CEST 20:00
NZT 7:00
Your time zone

⏱️ 50 minutes

📋
Bug Triage Hour

Bring the Phabricator tickets you really care about and we will improve it together to move it forward.


Facilitation: Lydia Pintscher (WMDE), BTracy-WMF

Friday, October 23rd

[edit]

UTC 16:00
CEST 18:00
NZT 5:00
Your time zone

⏱️ 50 minutes

🎤
Closing session and next steps

In this session we will wrap up the Query Service Days and recap what's next.


Facilitation: Lydia Pintscher (WMDE), BTracy-WMF

UTC 17:00
CEST 19:00
NZT 6:00
Your time zone

⏱️ 50 minutes

🎉
Wikidata games & socializing

Let's play some Wikidata-powered games together!


Facilitation: Lydia Pintscher (WMDE)

See also

[edit]

Feel free to add more links here!

🪷 Event useful links

🖋️ Related documentation pages

  • TBD

💬 Telegram and other social media

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