implemented a lot of features

database/migrations/1768620764930_add_nzb_import.ts

@@ -0,0 +1,24 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * NZBs posted to Usenet are read into releases (CONCEPT.md D26): the archive
+ * password they may carry, and a lookup of files by their first segment.
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.schema.alterTable('releases', (table) => {
+      // From <meta type="password"> of a posted NZB; passed on in our NZBs.
+      table.text('password')
+    })
+    this.defer(async (db) => {
+      await db.rawQuery(`CREATE INDEX IF NOT EXISTS files_first_segment_idx ON files ((message_ids->'1'->>'id'))`)
+    })
+  }
+
+  async down() {
+    this.defer(async (db) => {
+      await db.rawQuery('DROP INDEX IF EXISTS files_first_segment_idx')
+    })
+    this.schema.alterTable('releases', (table) => table.dropColumn('password'))
+  }
+}