feat: add askgh_repo_index_requested PostHog event

[msukkari]

Summary

Add a new PostHog event (askgh_repo_index_requested) that fires when Ask GH requests that a repo be indexed through the POST /api/experimental/add-github-repo endpoint.

Problem

On the public app (app.sourcebot.dev), repos can be indexed via Ask GH but there was no PostHog event that attributes who requested the index. We couldn't answer "who requested indexing of torvalds/linux?"

Solution

Emit a PostHog event at the moment an Ask GH index is requested, with properties that identify the requester.

Event Name

askgh_repo_index_requested

Properties

Property	Type	Description
owner	string	GitHub repository owner
repo	string	GitHub repository name
repoName	string	Combined owner/repo string for easy filtering
isAnonymous	boolean	Whether the requester is anonymous (not authenticated)
anonymousCreatorId	string?	Anonymous session ID (only present when isAnonymous is true)
repoId	number	The created/existing repo ID in the database

Querying in PostHog

Find all index requests for a specific repo:

askgh_repo_index_requested where repoName = 'torvalds/linux'

Find all anonymous vs signed-in requests:

askgh_repo_index_requested broken down by isAnonymous

Find requests by anonymous session:

askgh_repo_index_requested where anonymousCreatorId = '<session_id>'

Where it fires

packages/web/src/features/workerApi/actions.ts - in the addGithubRepo server action, after the backend successfully processes the repo index request.

Testing

• The event uses the existing captureEvent helper with proper user identity handling
• Anonymous users get tracked via anonymousCreatorId (same session cookie used for anonymous chat ownership)
• Signed-in users get tracked via their PostHog distinct_id

  

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Summary by cubic

Tracks successful Ask GH repo index requests in PostHog so we can attribute who requested indexing.

• Emits askgh_repo_index_requested after the index request is processed, capturing owner, repo, repoName, and repoId.
• Requester identity is handled by PostHog's built-in distinct ID from captureEvent, so no custom identity properties are tracked.

^{Written for commit a86cf5b. Summary will update on new commits.}

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