feat: add PostgreSQL EXPLAIN plan viewer

[Bhavik-ag]

Summary

• run EXPLAIN or confirmed EXPLAIN ANALYZE for the selected/current statement
• render FORMAT JSON plans as a collapsible tree table
• highlight expensive child nodes and estimate-vs-actual row mismatches
• preserve production typed confirmation and support cancellation

Stack

• depends on feat: add production-safe connection profiles #138 for production-safety profiles
• feat: add production-safe connection profiles #138 depends on feat: secure secrets and enable offline-first mode #135 for secure offline profiles

Validation

• 72 desktop tests
• desktop node and web TypeScript checks
• desktop lint
• production desktop build
• independent code review
• git diff --check

[vercel]

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2 Skipped Deployments

Project	Deployment	Actions	Updated
dbdesk-web	Ignored		Sep 19, 2026 3:07am UTC
dbdesk-server	Skipped		Sep 19, 2026 3:07am UTC

[greptile-apps]

Confidence Score: 4/5

The PR is not yet safe to merge because concurrent connection lifecycle operations can restore a closed profile or leak a live database adapter.

Summary

This PR adds a PostgreSQL EXPLAIN plan workflow and includes follow-up production-safety and connection-lifecycle changes.

• Executes the selected or current SQL statement with FORMAT JSON.
• Requires explicit confirmation for production EXPLAIN and all EXPLAIN ANALYZE operations.
• Parses and renders nested plans with cost and row-estimate highlighting.
• Adds parser, plan-viewer, production-safety, authentication-recovery, and reconnect-race tests.
• The previous import-order and plan-viewer-test findings are resolved.

_{Reviews (3) · Last reviewed commit: "feat: add PostgreSQL explain plan viewer"}