Index the Postgres FTS column

src/db/migrations/021_pgfts_index.ts

@@ -0,0 +1,21 @@
+import { Kysely } from 'kysely';
+
+import { Conf } from '@/config.ts';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+    await db.schema
+      .createIndex('nostr_pgfts_gin_search_vec')
+      .ifNotExists()
+      .on('nostr_pgfts')
+      .using('gin')
+      .column('search_vec')
+      .execute();
+  }
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  if (['postgres:', 'postgresql:'].includes(Conf.databaseUrl.protocol!)) {
+    await db.schema.dropIndex('nostr_pgfts_gin_search_vec').ifExists().execute();
+  }
+}