add api usage field in chat_message

[mrfinch]

Summary by CodeRabbit

• New Features
  • Chat messages now include API usage information showing which tool or model was used for each message, helping surface attribution and context in conversations.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This change adds a new public apiUsage object property to ChatMessageSchema, with metadata (title, description), allows additional properties, and defines a nested tool string property to record which tool/model produced the chat message. No other schema fields were modified.

Changes

Cohort / File(s)	Summary
Schema Property Addition app/schemas/models/chat_message.schema.js	Added apiUsage object property to ChatMessageSchema with title/description, additionalProperties: true, and a nested tool string property to track the tool/model used for the message.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• new properties in chat-message for usage #8043 — Adds an apiUsage object with a tool string to AIChatMessageSchema, indicating parallel schema additions for chat message types.

Poem

🐰 A tiny field hops into place,
To mark the tool behind each trace,
A whisper of usage, neat and small,
In schema gardens, standing tall,
Hooray for clarity—hop, hop, hooray!

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding an apiUsage field to the ChatMessageSchema. It is clear, concise, and directly related to the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@app/schemas/models/chat_message.schema.js`:
- Around line 279-290: The apiUsage property currently defined inside the
context object should be relocated to the top-level ChatMessageSchema.properties
to match ai_chat_message.schema.js; remove the apiUsage block from
context.properties and add an identical apiUsage property alongside
actor/parent/text in ChatMessageSchema.properties (preserve type: 'object',
description, additionalProperties: true and its subproperty tool) so the schema
structure is consistent with ai_chat_message.schema.js.