Fix the query to generate the changes view

[na-ga]

Why

I think Event Type pull_request and merge_request are the following webhook events.

• GitHub: pull_request
• GitLab: merge_request

According to their specification documents, the payload does not contain a commits field. In the query to generate the changes view, UNNEST(JSON_EXTRACT_ARRAY(e.metadata, '$.commits') is executed.

However, event_type pull_request and merge_request are excluded by the UNNEST function because they don't have commits field for the reason mentioned above.

Relation

The query that considers the metadata.commits field in the events_raw table was changed in PR #132. Before PR #132, the id of event_type pull_request and merge_request were shown as change_id in the changes view.

However, the id of event_type pull_request and merge_request are formatted as $repository_name/$number, which does not represent the SHA of the commit. Also, the metadata for the event_type pull_request and merge_request does not have a field representing the SHA of the commit.

So we can change the query that builds the changes view to target only event_type push, instead of treating it as before PR #132. Please advise me if my understanding is wrong.