Let a super admin read the database from the app

A new super admin settings page, /admin/settings/database, lists every
table with its record count and size, and one page of the open table's
records newest key first. Values are cut inside SQL (400 characters, with
a flag saying so) and a record opens whole in a modal, so a table of long
texts reads without shipping it all. A search matches every column's
text, word by word or as a phrase, which is the one thing that also works
on a virtual table. Nothing in it writes: the catalog, the records and
the single record are all reads, GET only.

src/functions/backend/database/group-table-catalog.ts

@@ -0,0 +1,35 @@
+import type { TableCatalogEntry, TableCatalogRow } from "./table-catalog-types";
+
+type Params = {
+    rows: TableCatalogRow[];
+};
+
+/**
+ * Groups the catalog's rows per table, keeping the statement's order, so
+ * the list of tables and every table's columns come back in one read.
+ */
+export default function groupTableCatalog({ rows }: Params): TableCatalogEntry[] {
+    const entries: TableCatalogEntry[] = [];
+
+    for (const row of rows) {
+        let entry = entries.at(-1);
+
+        if (!entry || entry.name != row.table_name) {
+            entry = {
+                name: row.table_name,
+                type: row.table_type,
+                has_rowid: row.table_type == "table" && !row.without_rowid,
+                columns: [],
+            };
+            entries.push(entry);
+        }
+
+        entry.columns.push({
+            name: row.column_name,
+            type: row.column_type || "",
+            pk: Boolean(row.column_pk),
+        });
+    }
+
+    return entries;
+}