diff --git a/SPEC.md b/SPEC.md
index f4e17d3..f5d4f1b 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -61,6 +61,8 @@ ui/
       Rules.jsx        — rule CRUD with live pattern preview
       Mappings.jsx     — mapping table with TSV import/export
       Records.jsx      — paginated, sortable view of transformed records
+      Pivot.jsx        — interactive pivot table with cell inspector
+      Log.jsx          — global import log across all sources
 public/                — compiled UI (output of npm run build in ui/)
 ```
 
@@ -214,7 +216,9 @@ Built with React + Vite + Tailwind CSS. Compiled output goes to `public/`. The s
 
 - **Mappings** — Tabular mapping editor. Shows all extracted values from transformed records with record counts and sample raw data. Rows are yellow (unmapped), white (mapped), or blue (edited but unsaved). Supports TSV export and import. Columns can be added dynamically.
 
-- **Records** — Paginated table showing the `dfv.{source}` view. Server-side sorting (column validated against `information_schema.columns`, interpolated with `quote_ident`). Dates are formatted `YYYY-MM-DD` for correct lexicographic sort.
+- **Records** — Paginated table showing the `dfv.{source}` view. Server-side sorting (column validated against `information_schema.columns`, interpolated with `quote_ident`). Dates are formatted `YYYY-MM-DD` for correct lexicographic sort. Regex filters can be added per column. If the view cast fails (e.g. a field typed as `date` contains text), the error is shown inline rather than a blank page.
+
+- **Pivot** — Interactive pivot/crosstab powered by [Perspective](https://perspective.finos.org/) (loaded from CDN at runtime). Loads all rows from the source view into an in-browser Perspective worker and renders a `<perspective-viewer>` web component. Supports grouping, splitting, filtering, sorting, and charting interactively. Layout (group_by, split_by, filters, plugin) is saved per source to `localStorage` and can be reset. Clicking a cell opens an inspector panel on the right showing the exact cell coordinates (group_by › split_by values), the clicked metric value, any active user filters, and the underlying raw rows that contribute to that cell. Row matching applies the `perspective-click` event's filter array directly against the in-memory rows, skipping filters for Perspective-computed columns (e.g. derived date parts like Month or YearDate) that don't exist in the source data.
 
 - **Log** — Global import log across all sources. Same expandable key detail and delete capability as the Import page, plus a source name column.