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-table-catalog-sql.ts

@@ -0,0 +1,33 @@
+/**
+ * The tables the database browser lists, each with its columns in their
+ * declared order, in one statement: `pragma_table_list` finds the tables
+ * and `pragma_table_info` reads each one's columns, the pragma taking the
+ * table name as an argument the way a table-valued function does.
+ *
+ * Left out: SQLite's own `sqlite_*` tables, and the shadow tables a
+ * virtual table keeps its internals in (the `bot_file_vectors_*` tables
+ * behind the sqlite-vec index), which are storage, not rows anyone
+ * browses.
+ */
+export default function buildTableCatalogSql(): string {
+    return `SELECT
+        l.name AS table_name,
+        l.type AS table_type,
+        l.wr AS without_rowid,
+        p.cid AS column_index,
+        p.name AS column_name,
+        p.type AS column_type,
+        p.pk AS column_pk
+    FROM pragma_table_list AS l
+    JOIN pragma_table_info(l.name) AS p
+    WHERE l.schema = 'main'
+        AND l.type IN ('table', 'virtual')
+        AND l.name NOT LIKE 'sqlite\\_%' ESCAPE '\\'
+        AND NOT EXISTS (
+            SELECT 1
+            FROM pragma_table_list AS v
+            WHERE v.type = 'virtual'
+                AND l.name LIKE v.name || '\\_%' ESCAPE '\\'
+        )
+    ORDER BY l.name ASC, p.cid ASC`;
+}