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/build-record-row.ts

@@ -0,0 +1,43 @@
+import { metaColumnAlias, RecordKeyAlias } from "./build-records-sql";
+import toDatabaseCell from "./to-database-cell";
+import type { DatabaseRecord, DatabaseTableColumn } from "@/src/types";
+
+type Params = {
+    /**
+     * The row as SQLite returned it, its meta columns included.
+     */
+    row: Record<string, unknown>;
+    columns: DatabaseTableColumn[];
+    max_chars: number;
+};
+
+/**
+ * One row of a records query as a record the browser can draw: its key,
+ * and every column's value as a cell. The meta columns the query added
+ * (`typeof` and `length` per column) are read and dropped here, so they
+ * never reach the client.
+ */
+export default function buildRecordRow({ row, columns, max_chars }: Params): DatabaseRecord {
+    const cells: Record<string, DatabaseRecord["cells"][string]> = {};
+
+    for (const column of columns) {
+        cells[column.name] = toDatabaseCell({
+            value: row[column.name],
+            type: String(row[metaColumnAlias({ name: column.name, kind: "type" })] ?? "null"),
+            length: Number(row[metaColumnAlias({ name: column.name, kind: "length" })] ?? 0),
+            max_chars,
+        });
+    }
+
+    const key = row[RecordKeyAlias];
+
+    return {
+        key:
+            typeof key == "string" || typeof key == "number"
+                ? key
+                : key === null || key === undefined
+                  ? null
+                  : String(key),
+        cells,
+    };
+}