diff --git a/sepa/bun.lockb b/sepa/bun.lockb
index 7493719..82b22b8 100755
Binary files a/sepa/bun.lockb and b/sepa/bun.lockb differ
diff --git a/sepa/importer-bench.js b/sepa/importer-bench.js
new file mode 100644
index 0000000..18b0535
--- /dev/null
+++ b/sepa/importer-bench.js
@@ -0,0 +1,30 @@
+// @ts-check
+import { run, bench, boxplot } from "mitata";
+import { execFile } from "node:child_process";
+import { promisify } from "node:util";
+import { main } from "./importer.js";
+import { rm } from "node:fs/promises";
+import { readFileSync } from "node:fs";
+const execFileAsync = promisify(execFile);
+
+async function fibonacci() {
+  await main("samples");
+}
+bench("main", async function* () {
+  await rm("importer.db", { force: true });
+  await rm("importer.db.wal", { force: true });
+  await execFileAsync("duckdb", [
+    "importer.db",
+    readFileSync("duckdb.sql", "utf8"),
+  ]);
+  yield () => fibonacci();
+});
+
+// await run();
+await rm("importer.db", { force: true });
+await rm("importer.db.wal", { force: true });
+await execFileAsync("duckdb", [
+  "importer.db",
+  readFileSync("duckdb.sql", "utf8"),
+]);
+await fibonacci();
diff --git a/sepa/importer.js b/sepa/importer.js
index 924f1f4..4df9bc7 100644
--- a/sepa/importer.js
+++ b/sepa/importer.js
@@ -3,7 +3,7 @@
 import * as fsp from "fs/promises";
 import * as fs from "fs";
 import { CsvParserStream, parse, parseString } from "fast-csv";
-import { basename, join, dirname } from "path";
+import { basename, join, dirname, resolve } from "path";
 import { $ } from "zx";
 import PQueue from "p-queue";
 import { Database } from "duckdb-async";
@@ -15,25 +15,53 @@ import {
 } from "@duckdb/node-api";
 import Papa from "papaparse";
 import { writeFile } from "fs/promises";
+import { fileURLToPath } from "url";
+
+const pathToThisFile = resolve(fileURLToPath(import.meta.url));
+const pathPassedToNode = resolve(process.argv[1]);
+const isThisFileBeingRunViaCLI = pathToThisFile.includes(pathPassedToNode);
 
 // TODO: verificar que pasa cuando hay varios datasets del mismo día (como los suele haber cuando actualizan el dataset con nuevos comercios)
-const instance = await DuckDBInstance.create("importer.db", {
-  // threads: "1",
-});
 
-const queue = new PQueue({ concurrency: 4 });
+const console = {
+  // @ts-ignore
+  log: (..._args) => {},
+  // @ts-ignore
+  error: (..._args) => globalThis.console.error(..._args),
+  // @ts-ignore
+  debug: (..._args) => {},
+};
 
-let hasTars = false;
-const files = await fg("**/*.tar.zst", { cwd: process.argv[2] });
-for (const file of files) {
-  hasTars = true;
-  const tar = join(process.argv[2], file);
-  queue.add(() => importDatasetTar(tar));
+if (isThisFileBeingRunViaCLI) {
+  await main(process.argv[2]);
 }
-await queue.onIdle();
 
-if (!hasTars) {
-  await importDump(process.argv[2]);
+/**
+ * @param {string} cwd
+ */
+export async function main(cwd) {
+  const instance = await DuckDBInstance.create("importer.db", {
+    // threads: "6",
+  });
+  if (cwd.endsWith(".tar.zst")) {
+    await importDatasetTar(instance, cwd);
+    return;
+  }
+  const queue = new PQueue({ concurrency: 4 });
+
+  let hasTars = false;
+  const files = await fg("**/*.tar.zst", { cwd });
+  console.log(`found ${files.length} tars`);
+  for (const file of files) {
+    hasTars = true;
+    const tar = join(cwd, file);
+    queue.add(() => importDatasetTar(instance, tar));
+  }
+  await queue.onIdle();
+
+  if (!hasTars) {
+    await importDump(instance, cwd);
+  }
 }
 
 /**
@@ -194,9 +222,25 @@ async function importPrecios(connection, datasetId, dir) {
       await writeFile(fixedCsvPath, file);
       // TODO: remove ultima actualizacion
     } else {
-      let file = await readFile(sourceCsvPath);
-      file = file.replace(/\r?\n( )?\0? *\r?\n"?[uúUÚ]/giu, "");
-      file = file.replaceAll(/[ \t]*\n/g, "\n");
+      // let file = await readFile(sourceCsvPath);
+      let file = await fsp.readFile(sourceCsvPath, "utf8");
+
+      if (
+        ["30590360763", "30687310434", "30685849751", "30525705931"].includes(
+          comercioCuit
+        )
+      ) {
+        let separator = file.lastIndexOf("\n\n");
+        if (separator === -1) separator = file.lastIndexOf("\r\n\r\n");
+        if (separator === -1) separator = file.lastIndexOf("\n\r\n");
+        if (separator === -1) separator = file.lastIndexOf("\n \n"); // TODO: actually make this work
+        if (separator === -1) separator = file.lastIndexOf("\n\0\n");
+        if (separator === -1) separator = file.lastIndexOf("\n \n");
+        file = file.slice(0, separator);
+      } else {
+        file = file.replace(/\r?\n( )?\0? *\r?\n"?[uúUÚ]/giu, "");
+        file = file.replaceAll(/[ \t]*\n/g, "\n");
+      }
       await writeFile(fixedCsvPath, file);
     }
 
@@ -209,9 +253,10 @@ async function importPrecios(connection, datasetId, dir) {
 }
 
 /**
+ * @param {DuckDBInstance} instance
  * @param {string} dir
  */
-async function importDataset(dir) {
+async function importDataset(instance, dir) {
   console.log(dir);
   const date = basename(dir).match(/(\d{4}-\d{2}-\d{2})/)?.[1];
   const id_comercio = basename(dir).match(/comercio-sepa-(\d+)/)?.[1];
@@ -259,27 +304,30 @@ async function importDataset(dir) {
 }
 
 /**
+ * @param {DuckDBInstance} instance
  * @param {string} tarPath
  */
-async function importDatasetTar(tarPath) {
+async function importDatasetTar(instance, tarPath) {
   console.log(`importing tar ${tarPath}`);
   const dir = await fsp.mkdtemp("/tmp/sepa-precios-importer-");
   try {
     await $`tar -x -C ${dir} -f ${tarPath}`;
-    await importDump(dir);
+    await importDump(instance, dir);
   } finally {
     await fsp.rm(dir, { recursive: true });
   }
 }
 
 /**
+ * @param {DuckDBInstance} instance
  * @param {string} dumpDir
  */
-async function importDump(dumpDir) {
+async function importDump(instance, dumpDir) {
   const files = await fg("**/productos.csv", { cwd: dumpDir });
-  for (const file of files) {
+  const shuffledFiles = [...files].sort(() => Math.random() - 0.5);
+  for (const file of shuffledFiles) {
     const dir = join(dumpDir, dirname(file));
-    await importDataset(dir);
+    await importDataset(instance, dir);
   }
 }
 
diff --git a/sepa/package.json b/sepa/package.json
index 2b7e995..b095299 100644
--- a/sepa/package.json
+++ b/sepa/package.json
@@ -25,6 +25,7 @@
     "fast-csv": "^5.0.2",
     "fast-glob": "^3.3.2",
     "jschardet": "^3.1.3",
+    "mitata": "^1.0.20",
     "p-queue": "^8.0.1",
     "papaparse": "^5.4.1",
     "postgres": "^3.4.4",