fix sql cells referencing itself

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📝 Summary

There's a bug where sql statements like this would reference itself.

CREATE TABLE my_table AS SELECT * FROM schema_one.my_table

We should skip if we find a referenced cell_id == current_cell_id.

This is happening because the function to find references searches through all the defs in the graph, so it will definitely find itself.

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Oct 30, 2025 2:24pm