Removes the SQL Editor Pretty Explain feature — the Explain tab, the Run
EXPLAIN ANALYZE action + shortcut, and its dead plumbing. It's been
gated off behind the `DisablePrettyExplainOnSqlEditor` kill switch for
weeks with no usage or complaints.
`ExplainVisualizer` / `isExplainQuery` are kept — they're used
independently by Query Insights, Query Performance, and the EditorPanel
quick-runner. Manually-run `EXPLAIN` queries still render as raw rows in
the Results tab.
Typecheck, lint, and all affected unit tests pass.
Closes FE-3930
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Changes**
* Removed the SQL editor’s EXPLAIN execution workflow, including its
toolbar action, keyboard shortcut, utility tab, and visual query-plan
display.
* Simplified query execution to focus on standard results and charts.
* Improved result clearing when switching databases and refined
execution error handling.
* Updated SQL editor state and tests to reflect the streamlined
experience.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## What
PR 6 of the SQL editor state re-layering stack. Moves ephemeral,
never-persisted SQL editor state out of the snippet/folder "god store".
**Session store** — `state/sql-editor/sql-editor-session-state.ts` holds
per-snippet, read-by-many session state:
- query `results`
- `explainResults`
- the row `limit`
…with their mutators (`addResult`/`addResultError`/`resetResult`,
`addExplainResult`/`addExplainResultError`/`resetExplainResult`,
`resetResults`, `setLimit`). `removeSnippet` drops a snippet's session
entries via `clearForSnippet(id)`.
**Diff-request slice** — `state/sql-editor/sql-editor-diff-request.ts`.
The Assistant's "Insert code" / "Replace code" diff is *not* per-snippet
session state: it's a transient, fire-and-forget command produced
outside the editor (e.g. query blocks / assistant) and consumed exactly
once by whichever editor is active. It's modeled as a consume-once
request (`requestDiff` / `consumeDiffRequest`) rather than durable state
— the editor drains it on apply, so a stale diff can't leak into a later
editor or session. (Previously this was `diffContent` in the god store:
never cleared and triggered by object-reference identity.)
Consumers read session state from `useSqlEditorSessionSnapshot` and the
diff channel from `useSqlEditorDiffRequestSnapshot`, keeping
`useSqlEditorV2StateSnapshot` only for snippets/folders.
### Why not the TanStack Query cache for results/explain?
Editor execution is a **mutation**, not a keyed query — `mutation.data`
is per-hook-instance and not keyed by snippet id, and there's no caching
value to capture (re-running SQL must return *fresh* data, never a
cached result). `EXPLAIN ANALYZE` actually executes the statement, so a
declarative/auto-refetching `useQuery` is semantically wrong.
Results/explain are imperative mutation outputs, scoped to the session,
read by several decoupled consumers keyed by snippet id — exactly what a
small in-memory keyed store models honestly.
## Consumers migrated
- `SQLEditor.tsx` — results/explain/limit reads +
`addResult`/`addResultError`/`addExplainResult`/`addExplainResultError`/`setLimit`;
diff-apply effect now drains a consume-once request
- `UtilityPanel.tsx`, `UtilityTabResults.tsx`, `UtilityTabExplain.tsx`,
`UtilityActions.tsx`
- `QueryBlock/EditQueryButton.tsx` — produces via `requestDiff`
## Notes
- Result/explain types are kept verbatim from the god store
(pre-existing `any` row/error types come along unchanged; tightening
them is out of scope for this move).
- `ref()` on result rows is preserved to avoid Valtio proxying large row
sets.
## Tests
- `sql-editor-session-state.test.ts` — result/explain mutators,
`resetResults`, `clearForSnippet`, `limit`
- `sql-editor-diff-request.test.ts` — `requestDiff`,
`consumeDiffRequest` (drain + queue-of-one)
Validation:
- `pnpm --filter studio typecheck` ✅
- `pnpm exec vitest --run state/sql-editor/` ✅ (110 passed)
- lint ✅ (no new errors)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* SQL editor query results, EXPLAIN output, and the “Limit results to”
setting now persist more reliably across a session.
* AI-assisted SQL insert/replace actions now use a pending diff workflow
to apply updates more consistently.
* **Bug Fixes**
* Results/EXPLAIN rendering and downloads stay in sync with the latest
executed data.
* Switching databases/snippets now clears the correct temporary results.
* Diff application is more resilient when an editor is still loading,
including empty-vs-non-empty editor cases.
* **Tests**
* Added coverage for the session and diff-request state logic.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Joshen Lim <joshenlimek@gmail.com>
