implemented a lot of features

database/migrations/1768620764760_add_par2_matching.ts

@@ -0,0 +1,33 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * Par2-based grouping of obfuscated posts (CONCEPT.md D16): the par2 file
+ * list of a release, and the exact file size of body-derived binaries to
+ * match against it.
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.schema.alterTable('binaries', (table) => {
+      // Exact file size from =ybegin; only known for body-derived binaries.
+      table.bigInteger('size').index()
+    })
+    this.schema.alterTable('releases', (table) => {
+      // How the release was recognised: subject, stem, weak-stem or par2.
+      table.string('source', 16)
+    })
+    this.schema.createTable('release_files', (table) => {
+      table.bigInteger('release_id').notNullable().references('releases.id').onDelete('CASCADE')
+      table.string('par2_file_id', 32).notNullable()
+      table.text('name').notNullable()
+      table.bigInteger('size').notNullable().index()
+      table.string('md5_16k', 32).notNullable()
+      table.primary(['release_id', 'par2_file_id'])
+    })
+  }
+
+  async down() {
+    this.schema.dropTable('release_files')
+    this.schema.alterTable('releases', (table) => table.dropColumn('source'))
+    this.schema.alterTable('binaries', (table) => table.dropColumn('size'))
+  }
+}