Proposal: Add DPM Trace source-aware debugging

Development Fund Proposal Submission

Proposal file: /proposals/dpm-trace-source-aware-debugging.md

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Summary

We propose to build dpm trace, an open-source DPM plugin for inspecting and debugging Canton transactions. A developer should be able to start from an already committed update id, run a single CLI command, and get a readable transaction trace. From there, the tool adds interactive inspection and source-aware debugging workflows. To make that reliable, we also propose compiler-generated debug metadata so transaction traces and debugger steps can link back to Daml source.

Proof of Concept Implementation

• dpm trace: https://github.com/walnuthq/dpm-trace
• Initial damlc --debug-info support branch: https://github.com/walnuthq/daml/tree/feature/debug-info

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Checklist

• [x] Proposal file added under /proposals/
• [x] Milestones and funding amounts defined
• [x] Acceptance criteria included
• [x] Alignment with Canton priorities described

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Notes for Reviewers

We are open for discussion.