implemented a lot of features

database/migrations/1768620764790_create_part_conflicts_table.ts

@@ -0,0 +1,32 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * Splitting equal-sized obfuscated volumes (CONCEPT.md D20): the extra
+ * articles of conflicted binaries are kept, and the split-off volumes point
+ * to the conflicted binary they came from.
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.schema.createTable('part_conflicts', (table) => {
+      table.bigInteger('binary_id').notNullable().references('binaries.id').onDelete('CASCADE')
+      table.integer('number').notNullable()
+      table.text('message_id').notNullable()
+      table.integer('bytes').notNullable()
+      table.bigInteger('article_number')
+      table.primary(['binary_id', 'number', 'message_id'])
+    })
+    this.schema.alterTable('binaries', (table) => {
+      table.bigInteger('parent_binary_id').references('binaries.id').onDelete('SET NULL').index()
+      // Last time the splitter processed this conflicted binary.
+      table.timestamp('split_at', { useTz: true })
+    })
+  }
+
+  async down() {
+    this.schema.alterTable('binaries', (table) => {
+      table.dropColumn('split_at')
+      table.dropColumn('parent_binary_id')
+    })
+    this.schema.dropTable('part_conflicts')
+  }
+}