feat: basic admin interface

drizzle/migrations/20261008182241_instance-settings/migration.sql

@@ -0,0 +1,5 @@
+CREATE TABLE "instance_settings" (
+	"id" text PRIMARY KEY,
+	"registration" text DEFAULT 'open' NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);

drizzle/schema.ts

@@ -25,6 +25,19 @@ export enum ToolCallType {
     Json = 'json',
 }
 
+export const REGISTRATION_MODES = ['open', 'invite', 'closed'] as const;
+export type RegistrationMode = typeof REGISTRATION_MODES[number];
+
+export const INSTANCE_SETTINGS_ID = 'instance';
+
+// Settings of the whole instance, changed by admins. There is only ever the
+// one row with the id above.
+export const instanceSettings = pgTable('instance_settings', {
+    id: text('id').primaryKey(),
+    registration: text('registration').$type<RegistrationMode>().notNull().default('open'),
+    updatedAt: timestamptz('updated_at').notNull().defaultNow().$onUpdate(() => /* @__PURE__ */ new Date()),
+});
+
 export const settings = pgTable('settings', {
     id: text('id').primaryKey().$defaultFn(nanoid),
     userId: text('user_id').notNull(),