diff --git a/src/migrations/index.js b/src/migrations/index.js
index 350221c5..b470d313 100644
--- a/src/migrations/index.js
+++ b/src/migrations/index.js
@@ -8,14 +8,16 @@ import migrations from './migrations'
 
 // Logic to run all the migrations based on what was not yet run:
 export const runMigrations = async (): Promise<void> => {
-  const current = await db.getNamespace('migrations')
+  // Legacy: the migration nonce was previously stored in separate file
+  // it can happen, so we have to check it from here also.
+  const current = (await db.getKey('app', 'migrations')) || (await db.getNamespace('migrations'))
 
   let { nonce } = current || { nonce: migrations.length }
   const outdated = migrations.length - nonce
 
   if (!outdated) {
     if (!current) {
-      await db.setNamespace('migrations', { nonce })
+      await db.setKey('app', 'migrations.nonce', nonce)
     }
     return
   }
@@ -31,6 +33,6 @@ export const runMigrations = async (): Promise<void> => {
     }
     logger.log(`${outdated} migration(s) performed.`)
   } finally {
-    await db.setNamespace('migrations', { nonce })
+    await db.setKey('app', 'migrations.nonce', nonce)
   }
 }
diff --git a/src/migrations/migrations.js b/src/migrations/migrations.js
index ed7fc04d..e67767d2 100644
--- a/src/migrations/migrations.js
+++ b/src/migrations/migrations.js
@@ -18,7 +18,7 @@ const migrations: Migration[] = [
       const dbPath = db.getDBPath()
       const legacyKeys = ['accounts', 'countervalues', 'settings', 'user']
       const [accounts, countervalues, settings, user] = await Promise.all(
-        legacyKeys.map(key => getLegacyData(path.join(dbPath, `${key}.json`))),
+        legacyKeys.map(key => getFileData(dbPath, key)),
       )
       const appData = { user, settings, accounts, countervalues }
       await db.setNamespace('app', appData)
@@ -28,15 +28,33 @@ const migrations: Migration[] = [
       const windowParams = await db.getKey('app', 'settings.window')
       await db.setKey('app', 'settings.window', undefined)
       await db.setNamespace('windowParams', windowParams)
-      await Promise.all(legacyKeys.map(key => fsUnlink(path.join(dbPath, `${key}.json`))))
+      await Promise.all(
+        legacyKeys.map(async key => {
+          try {
+            await fsUnlink(path.join(dbPath, `${key}.json`))
+          } catch (err) {} // eslint-disable-line
+        }),
+      )
+    },
+  },
+  {
+    doc: 'merging migrations into app.json',
+    run: async () => {
+      const migrations = await db.getNamespace('migrations')
+      await db.setKey('app', 'migrations', migrations)
+      const dbPath = db.getDBPath()
+      try {
+        await fsUnlink(path.resolve(dbPath, 'migrations.json'))
+      } catch (err) {} // eslint-disable-line
     },
   },
 ]
 
-async function getLegacyData(filePath) {
+async function getFileData(dbPath, fileName) {
+  const filePath = path.join(dbPath, `${fileName}.json`)
   let finalData
-  const fileContent = await fsReadfile(filePath, 'utf-8')
   try {
+    const fileContent = await fsReadfile(filePath, 'utf-8')
     const { data } = JSON.parse(fileContent)
     finalData = data
   } catch (err) {
@@ -45,7 +63,8 @@ async function getLegacyData(filePath) {
       const buf = await fsReadfile(filePath)
       return buf.toString('base64')
     }
-    throw err
+    // will be stripped down by JSON.stringify
+    return undefined
   }
   return finalData
 }
diff --git a/src/migrations/migrations.spec.js b/src/migrations/migrations.spec.js
index 5898cab8..18af426e 100644
--- a/src/migrations/migrations.spec.js
+++ b/src/migrations/migrations.spec.js
@@ -12,6 +12,7 @@ import db from 'helpers/db'
 
 const rimraf = promisify(rimrafModule)
 const fsReaddir = promisify(fs.readdir)
+const fsReadFile = promisify(fs.readFile)
 
 const tmpDir = os.tmpdir()
 
@@ -20,14 +21,12 @@ const accountsTransform = {
   set: encodeAccountsModel,
 }
 
-describe('migration 1', () => {
+describe('from nonce 0', () => {
   describe('without encryption', () => {
     test('merging db files', async () => {
       const dir = await extractMock('userdata_v1.0.5_mock-01')
-      let files
       db.init(dir)
-      files = await fsReaddir(dir)
-      expect(files).toEqual([
+      await expectFiles(dir, [
         'accounts.json',
         'countervalues.json',
         'migrations.json',
@@ -35,8 +34,7 @@ describe('migration 1', () => {
         'user.json',
       ])
       await runMigrations()
-      files = await fsReaddir(dir)
-      expect(files).toEqual(['app.json', 'migrations.json', 'windowParams.json'])
+      await expectFiles(dir, ['app.json', 'windowParams.json'])
       db.init(dir)
       db.registerTransform('app', 'accounts', accountsTransform)
       const accounts = await db.getKey('app', 'accounts')
@@ -50,6 +48,40 @@ describe('migration 1', () => {
         },
       })
     })
+
+    test('handle missing file without crash', async () => {
+      const dir = await extractMock('userdata_v1.0.5_mock-03-missing-file')
+      await expectFiles(dir, [
+        'countervalues.json',
+        'migrations.json',
+        'settings.json',
+        'user.json',
+      ])
+      db.init(dir)
+      let err
+      try {
+        await runMigrations()
+      } catch (e) {
+        err = e
+      }
+      expect(err).toBeUndefined()
+      await expectFiles(dir, ['app.json', 'windowParams.json'])
+    })
+
+    test('handle where app.json is already present', async () => {
+      const dir = await extractMock('userdata_v1.0.5_mock-04-app-json-present')
+      await expectFiles(dir, [
+        'accounts.json',
+        'app.json',
+        'countervalues.json',
+        'migrations.json',
+        'settings.json',
+        'user.json',
+      ])
+      db.init(dir)
+      await runMigrations()
+      await expectFiles(dir, ['app.json', 'windowParams.json'])
+    })
   })
 
   describe('with encryption', () => {
@@ -59,8 +91,7 @@ describe('migration 1', () => {
       db.registerTransform('app', 'accounts', accountsTransform)
       await runMigrations()
       await db.setEncryptionKey('app', 'accounts', 'passw0rd')
-      const files = await fsReaddir(dir)
-      expect(files).toEqual(['app.json', 'migrations.json', 'windowParams.json'])
+      await expectFiles(dir, ['app.json', 'windowParams.json'])
       const accounts = await db.getKey('app', 'accounts')
       expect(accounts.length).toBe(6)
       expect(accounts[0].balance).toBeInstanceOf(BigNumber)
@@ -79,6 +110,21 @@ describe('migration 1', () => {
   })
 })
 
+describe('from nonce 1', () => {
+  test('merging migration file into app file', async () => {
+    const dir = await extractMock('userdata_v1.1.1_mock-01')
+    await expectFiles(dir, ['app.json', 'migrations.json', 'windowParams.json'])
+    const migrationsBefore = await fsReadFile(path.resolve(dir, 'migrations.json'), 'utf-8')
+    expect(migrationsBefore).toBe('{"data":{"nonce":1}}')
+    db.init(dir)
+    db.registerTransform('app', 'accounts', accountsTransform)
+    await runMigrations()
+    await expectFiles(dir, ['app.json', 'windowParams.json'])
+    const migrations = await db.getKey('app', 'migrations')
+    expect(migrations).toEqual({ nonce: 2 })
+  })
+})
+
 async function extractMock(mockName) {
   const destDirectory = path.resolve(tmpDir, mockName)
   const zipFilePath = path.resolve(__dirname, 'mocks', `${mockName}.zip`)
@@ -94,3 +140,8 @@ function extractZip(zipFilePath, destDirectory) {
     childProcess.on('error', reject)
   })
 }
+
+async function expectFiles(dir, expectedFiles) {
+  const files = await fsReaddir(dir)
+  expect(files).toEqual(expectedFiles)
+}
diff --git a/src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip b/src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip
new file mode 100644
index 00000000..b390d1b0
Binary files /dev/null and b/src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip differ
diff --git a/src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip b/src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip
new file mode 100644
index 00000000..eebdc20c
Binary files /dev/null and b/src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip differ
diff --git a/src/migrations/mocks/userdata_v1.1.1_mock-01.zip b/src/migrations/mocks/userdata_v1.1.1_mock-01.zip
new file mode 100644
index 00000000..c309f8b2
Binary files /dev/null and b/src/migrations/mocks/userdata_v1.1.1_mock-01.zip differ
diff --git a/src/sentry/install.js b/src/sentry/install.js
index 5b78ddf8..5d75ed47 100644
--- a/src/sentry/install.js
+++ b/src/sentry/install.js
@@ -16,6 +16,18 @@ export default (Raven: any, shouldSendCallback: () => boolean, userId: string) =
     },
     environment: __DEV__ ? 'development' : 'production',
     shouldSendCallback,
+    ignoreErrors: [
+      'status code 404',
+      'timeout',
+      'socket hang up',
+      'getaddrinfo ',
+      'ETIMEDOUT',
+      'ECONNRESET',
+      'ENETUNREACH',
+      'request timed out',
+      'NetworkDown',
+      'ERR_CONNECTION_TIMED_OUT',
+    ],
     autoBreadcrumbs: {
       xhr: false, // it is track anonymously from logger
       console: false, // we don't track because not anonymized