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docs: add SQL performance tips to STYLE.md

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2026-03-26 17:23:17 +01:00
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@@ -68,6 +68,12 @@ keyword doesn't help here.
Consider adding context to `anyhow` errors for SQL statements using `.context()` so that it's
possible to understand from logs which statement failed. See [Errors](#errors) for more info.
When changing complex SQL queries, test them on a new database with `EXPLAIN QUERY PLAN`
to make sure that indexes are used and large tables are not going to be scanned.
Never run `ANALYZE` on the databases,
this makes query planner unpredictable
and may make performance significantly worse: <https://github.com/chatmail/core/issues/6585>
## Errors
Delta Chat core mostly uses [`anyhow`](https://docs.rs/anyhow/) errors.