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apps/server/src/routes/settings.ts

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+import type { FastifyInstance } from 'fastify';
+import { z } from 'zod';
+import type { Sql } from '../db.js';
+
+export async function getSetting<T = unknown>(
+  sql: Sql,
+  key: string
+): Promise<T | null> {
+  const rows = await sql<{ value: T }[]>`SELECT value FROM settings WHERE key = ${key}`;
+  return rows[0]?.value ?? null;
+}
+
+export async function setSetting(
+  sql: Sql,
+  key: string,
+  value: unknown
+): Promise<void> {
+  await sql`
+    INSERT INTO settings (key, value)
+    VALUES (${key}, ${sql.json(value as never)})
+    ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value
+  `;
+}
+
+const PatchBody = z.record(z.string(), z.unknown());
+
+export function registerSettingsRoutes(app: FastifyInstance, sql: Sql): void {
+  app.get('/api/settings', async () => {
+    const rows = await sql<{ key: string; value: unknown }[]>`SELECT key, value FROM settings`;
+    const out: Record<string, unknown> = {};
+    for (const r of rows) out[r.key] = r.value;
+    return out;
+  });
+
+  app.patch('/api/settings', async (req, reply) => {
+    const parsed = PatchBody.safeParse(req.body);
+    if (!parsed.success) {
+      reply.code(400);
+      return { error: 'invalid body', details: parsed.error.flatten() };
+    }
+    for (const [k, v] of Object.entries(parsed.data)) {
+      await setSetting(sql, k, v);
+    }
+    const rows = await sql<{ key: string; value: unknown }[]>`SELECT key, value FROM settings`;
+    const out: Record<string, unknown> = {};
+    for (const r of rows) out[r.key] = r.value;
+    return out;
+  });
+}