add pg_activity to flake.nix

[pyranota]

No description provided.

[claude]

Claude finished @pyranota's task in 59s —— View job

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Review of PR #7433: Add pg_activity to flake.nix

• Gather context and understand the change
• Review the code changes
• Provide feedback

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Summary

This PR adds pg_activity to the Nix development shell packages. pg_activity is a PostgreSQL monitoring tool similar to top that provides real-time views of database activity including running queries, locks, and connections.

Review

✅ LGTM - This is a straightforward and well-placed addition.

Positive observations:

• The package is placed in the appropriate section alongside other development/debugging tools (xcaddy, cargo-watch, nsjail, sccache)
• pg_activity is a useful development tool for monitoring PostgreSQL queries and performance, which aligns well with Windmill's database-heavy architecture
• The commit message is clear and properly signed

Code quality: The change follows existing patterns in the flake.nix file and maintains alphabetical-ish ordering in that section.

No issues found:

• No security concerns
• No performance implications (it's just a dev tool)
• No breaking changes

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Testing Instructions

This change affects the Nix development environment. To verify:

1. Run nix develop to enter the development shell
2. Run pg_activity --version to confirm the tool is available
3. With a local PostgreSQL database running (e.g., via the Windmill dev setup), run pg_activity -U postgres -d windmill to monitor database activity