# Phase 19 — Column-aware SQL completion and incremental CSV writing

- Load column names from `information_schema.COLUMNS` when a schema is expanded/refreshed. Cache column names and `table.column` suggestions for the active schema; metadata errors are nonfatal.
- SQL completion now includes cached column suggestions alongside tables, views and keywords.
- Write CSV results one record at a time to a temporary file, with UTF-8 BOM, CRLF and quote escaping; move into place only on success.
- Retains all Phase 18 features.

## Limitations
- Metadata suggestions require loading the schema navigator first and sufficient `information_schema` visibility.
- CSV export still operates on the existing in-memory query result (subject to query result limits); it does not fetch additional database rows.
- Result-grid filtering/sorting still creates an in-memory sorted list.
- Not compiled on macOS or tested against MySQL. Build and test with Xcode before production use.