Harden Linear XLSX end to end

tests/batched-insert.persistence.test.ts

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+import assert from "node:assert/strict";
+import path from "node:path";
+import { describe, it } from "node:test";
+import { migrate } from "drizzle-orm/better-sqlite3/migrator";
+import { createDatabaseContext } from "../src/db/database-context.js";
+import { insertManyInBatches } from "../src/db/repositories/batched-insert.persistence.js";
+import { projects } from "../src/db/schema/projects.js";
+
+describe("batched SQLite inserts", () => {
+  it("keeps every batch inside the caller transaction", () => {
+    const context = createDatabaseContext(":memory:");
+    try {
+      migrate(context.db, { migrationsFolder: path.resolve("src", "db", "migrations") });
+      const values = Array.from({ length: 401 }, (_, index) => ({ id: `project-${index}`, name: `Projekt ${index}` }));
+      values[400] = { id: "project-0", name: "Duplikat" };
+      assert.throws(() => context.db.transaction((tx) => insertManyInBatches(tx, projects, values)));
+      assert.equal(context.db.select().from(projects).all().length, 0);
+    } finally { context.close(); }
+  });
+});