Rebuild: schema for groups, rule sets, ranges, release catalog, chunk store, fragments, probe queue, rule bookkeeping and nodes

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/migrations/1770000000600_create_fragments.ts

@@ -0,0 +1,24 @@
+import { BaseSchema } from '@adonisjs/lucid/schema'
+
+/**
+ * Segments of files cut off by a range's edge (REBUILD.md, fragments): kept
+ * by range, merged when the neighbouring range is done, then written as a
+ * chunk.
+ */
+export default class extends BaseSchema {
+  async up() {
+    this.schema.createTable('fragments', (table) => {
+      table.bigIncrements('id')
+      table.bigInteger('range_id').notNullable()
+      table.string('file_key', 40).notNullable()
+      table.bigInteger('article_number').notNullable()
+      table.jsonb('segment').notNullable()
+      table.index(['file_key'])
+      table.index(['range_id'])
+    })
+  }
+
+  async down() {
+    this.schema.dropTable('fragments')
+  }
+}