diff --git a/.github/workflows/playwright.yml b/.github/workflows/playwright.yml
index 7e407c9..5c2beda 100644
--- a/.github/workflows/playwright.yml
+++ b/.github/workflows/playwright.yml
@@ -6,6 +6,7 @@ on:
     branches: [ main, master ]
 jobs:
   test:
+    concurrency: "playwright-test"
     timeout-minutes: 60
     runs-on: ubuntu-latest
     steps:
diff --git a/src/components/databrowser/components/display/input/custom-editor.tsx b/src/components/databrowser/components/display/input/custom-editor.tsx
index 9344977..f2f5777 100644
--- a/src/components/databrowser/components/display/input/custom-editor.tsx
+++ b/src/components/databrowser/components/display/input/custom-editor.tsx
@@ -6,21 +6,32 @@ import { Editor, useMonaco } from "@monaco-editor/react"
 import { cn, isTest } from "@/lib/utils"
 import { CopyButton } from "@/components/databrowser/copy-button"
 
-export const CustomEditor = ({
-  language,
-  value,
-  onChange,
-  height,
-  showCopyButton,
-  readOnly,
-}: {
+type CustomEditorProps = {
   language: string
   value: string
   onChange: (value: string) => void
   height?: number
   showCopyButton?: boolean
   readOnly?: boolean
-}) => {
+}
+
+export const CustomEditor = (props: CustomEditorProps) => {
+  // Avoid mounting Monaco at all during Playwright runs
+  if (isTest) {
+    return <TestEditor {...props} />
+  }
+
+  return <MonacoEditor {...props} />
+}
+
+const MonacoEditor = ({
+  language,
+  value,
+  onChange,
+  height,
+  showCopyButton,
+  readOnly,
+}: CustomEditorProps) => {
   const { active } = useTab()
   const monaco = useMonaco()
   const editorRef = useRef()
@@ -82,11 +93,24 @@ export const CustomEditor = ({
       className={cn("group/editor relative", height === undefined && "h-full")}
       style={{ height: height }}
     >
-      {isTest ? (
-        <input aria-label="editor" value={value} onChange={(e) => onChange(e.target.value)} />
-      ) : (
-        editor
+      {editor}
+      {showCopyButton && (
+        <CopyButton
+          value={value}
+          className="absolute right-0 top-0 hidden group-hover/editor:flex"
+        />
       )}
+    </div>
+  )
+}
+
+const TestEditor = ({ value, onChange, height, showCopyButton }: CustomEditorProps) => {
+  return (
+    <div
+      className={cn("group/editor relative", height === undefined && "h-full")}
+      style={{ height: height }}
+    >
+      <input aria-label="editor" value={value} onChange={(e) => onChange(e.target.value)} />
       {showCopyButton && (
         <CopyButton
           value={value}
diff --git a/src/store.tsx b/src/store.tsx
index 23dab07..6523846 100644
--- a/src/store.tsx
+++ b/src/store.tsx
@@ -45,7 +45,7 @@ export const DatabrowserProvider = ({
           setItem: (_name, value) => storage.set(JSON.stringify(value)),
           removeItem: () => {},
         },
-        version: 4,
+        version: 5,
         migrate: (originalState, version) => {
           const state = originalState as DatabrowserStore
 
@@ -53,10 +53,11 @@ export const DatabrowserProvider = ({
             state.tabs = state.tabs.map(([id, data]) => [id, { ...data, id }])
           }
 
-          if (version <= 2) {
+          if (version <= 4) {
             // Migrate from selectedKey to selectedKeys
             state.tabs = state.tabs.map(([id, data]) => {
               const oldData = data as any
+              if (oldData.selectedKeys && Array.isArray(oldData.selectedKeys)) return [id, data]
               return [
                 id,
                 { ...data, selectedKeys: oldData.selectedKey ? [oldData.selectedKey] : [] },
diff --git a/src/tab-provider.tsx b/src/tab-provider.tsx
index 3599ce8..9790e25 100644
--- a/src/tab-provider.tsx
+++ b/src/tab-provider.tsx
@@ -38,8 +38,8 @@ export const useTab = () => {
   return useMemo(
     () => ({
       active: selectedTab === tabId,
-      selectedKey: tabData.selectedKeys[0], // Backwards compatibility - first selected key
-      selectedKeys: tabData.selectedKeys,
+      selectedKey: tabData.selectedKeys?.[0], // Backwards compatibility - first selected key
+      selectedKeys: tabData.selectedKeys ?? [],
       selectedListItem: tabData.selectedListItem,
       search: tabData.search,
       pinned: tabData.pinned,
diff --git a/tests/migration.spec.ts b/tests/migration.spec.ts
index 6bc8f92..f3bd502 100644
--- a/tests/migration.spec.ts
+++ b/tests/migration.spec.ts
@@ -1,7 +1,6 @@
 import { expect, test, type Page } from "@playwright/test"
 
 import { setup } from "./utils"
-import { describe } from "node:test"
 
 /**
  * Helper to set localStorage before page loads
@@ -71,16 +70,17 @@ const createVersion2Data = () => ({
     ],
     searchHistory: ["previous-search"],
   },
+
   version: 2,
 })
 
-const testFunctionality = (version: number) => {
-  test(`v${version} add new tab`, async ({ page }) => {
+const testFunctionality = () => {
+  test("add new tab", async ({ page }) => {
     await page.getByRole("button", { name: "Add new tab" }).click()
     await expect(getTabs(page)).toHaveCount(3)
   })
 
-  test(`v${version} select new key`, async ({ page }) => {
+  test("select new key", async ({ page }) => {
     await page.getByRole("textbox", { name: "Search" }).click()
     await page.getByRole("textbox", { name: "Search" }).fill("mykey-33")
     await page.getByRole("textbox", { name: "Search" }).press("Enter")
@@ -89,22 +89,34 @@ const testFunctionality = (version: number) => {
   })
 }
 
-describe("migration from version 1", () => {
+test.describe("migrate from v1", () => {
   test.beforeEach(async ({ page }) => {
     await setup(page)
     await setStorageBeforeLoad(page, createVersion1Data())
     await page.goto("/")
   })
 
-  testFunctionality(1)
+  testFunctionality()
 })
 
-describe("migration from version 2", () => {
+test.describe("migrate from v2", () => {
   test.beforeEach(async ({ page }) => {
     await setup(page)
     await setStorageBeforeLoad(page, createVersion2Data())
     await page.goto("/")
   })
 
-  testFunctionality(2)
+  testFunctionality()
+})
+
+test.describe("migrate from v2 that has version set to 3 (broken)", () => {
+  test.beforeEach(async ({ page }) => {
+    await setup(page)
+    const state = createVersion2Data()
+    state.version = 3
+    await setStorageBeforeLoad(page, state)
+    await page.goto("/")
+  })
+
+  testFunctionality()
 })
diff --git a/tests/test.spec.ts b/tests/test.spec.ts
index 1008d34..959469c 100644
--- a/tests/test.spec.ts
+++ b/tests/test.spec.ts
@@ -1,4 +1,3 @@
-import { describe } from "node:test"
 import { expect, test } from "@playwright/test"
 
 import { markDatabaseAsModified, setup } from "./utils"
@@ -9,7 +8,7 @@ test.beforeEach(async ({ page }) => {
   await page.goto("/")
 })
 
-describe("keys", () => {
+test.describe("keys", () => {
   test("can search for a key", async ({ page }) => {
     await page.getByRole("textbox", { name: "Search" }).click()
     await page.getByRole("textbox", { name: "Search" }).fill("mykey-2")
@@ -114,7 +113,7 @@ describe("keys", () => {
   })
 })
 
-describe("hash", () => {
+test.describe("hash", () => {
   test("can read a hash value and cancel", async ({ page }) => {
     await page.getByRole("textbox", { name: "Search" }).click()
     await page.getByRole("textbox", { name: "Search" }).fill("myhash")
@@ -182,7 +181,7 @@ describe("hash", () => {
   })
 })
 
-describe("tabs", () => {
+test.describe("tabs", () => {
   test("can switch tabs", async ({ page }) => {
     await page.getByRole("textbox", { name: "Search" }).click()
     await page.getByRole("textbox", { name: "Search" }).fill("mykey-42")
diff --git a/tests/utils.ts b/tests/utils.ts
index db146b0..28f5220 100644
--- a/tests/utils.ts
+++ b/tests/utils.ts
@@ -15,6 +15,16 @@ export const setup = async (page: Page) => {
     ;(window as any).__PLAYWRIGHT__ = true
   })
 
+  // Fail fast on browser-side errors instead of waiting for timeouts
+  page.on("pageerror", (error) => {
+    throw error
+  })
+  page.on("console", (msg) => {
+    if (msg.type() === "error") {
+      throw new Error(`Console error: ${msg.text()}`)
+    }
+  })
+
   const isOriginal = await redis.exists(IS_ORIGINAL_KEY)
 
   if (!isOriginal) {