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/schemas/database-schema.ts

@@ -0,0 +1,35 @@
+import { z } from "zod";
+import { AppData } from "@/src/data/app-data";
+
+/**
+ * The table a database browser request asks for, by its own name.
+ */
+const TableField = z
+    .string()
+    .min(1, "Pick a table")
+    .max(120, "That isn't a table name");
+
+/**
+ * `GET api/admin/database/records`: one page of one table's records.
+ */
+export const DatabaseRecordsRequestSchema = z.object({
+    table: TableField.optional(),
+    page: z.coerce.number().int().positive().default(1),
+    search: z.string().max(200).optional(),
+    mode: z.enum(["every_word", "phrase"]).default("every_word"),
+});
+
+export type DatabaseRecordsRequest = z.infer<typeof DatabaseRecordsRequestSchema>;
+
+/**
+ * `GET api/admin/database/record`: one record, by its key.
+ */
+export const DatabaseRecordRequestSchema = z.object({
+    table: TableField,
+    key: z
+        .string()
+        .min(1, "Pick a record")
+        .max(AppData.DatabaseBrowserCellMaxChars, "That isn't a record key"),
+});
+
+export type DatabaseRecordRequest = z.infer<typeof DatabaseRecordRequestSchema>;