diff --git a/database/integrity/0013-test.ts.keep b/database/integrity/0013-test.ts.keep
new file mode 100644
index 000000000..b020c0657
--- /dev/null
+++ b/database/integrity/0013-test.ts.keep
@@ -0,0 +1,86 @@
+/* MIGRATION TO CLEAN PRODUCTION DATA
+ *
+ * the way the passphrases are stored in login_user_backups is inconsistent.
+ * we need to try to detect which word list was used and transform it accordingly
+ */
+
+import fs from 'fs'
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const sodium = require('sodium-native')
+
+const PHRASE_WORD_COUNT = 24
+const WORDS = fs
+  .readFileSync('src/config/mnemonic.uncompressed_buffer13116.txt')
+  .toString()
+  .split(',')
+
+const KeyPairEd25519Create = (passphrase: string[]): Buffer[] => {
+  if (!passphrase.length || passphrase.length < PHRASE_WORD_COUNT) {
+    throw new Error('passphrase empty or to short')
+  }
+
+  const state = Buffer.alloc(sodium.crypto_hash_sha512_STATEBYTES)
+  sodium.crypto_hash_sha512_init(state)
+
+  for (let i = 0; i < PHRASE_WORD_COUNT; i++) {
+    const value = Buffer.alloc(8)
+    const wordIndex = WORDS.indexOf(passphrase[i])
+    value.writeBigInt64LE(BigInt(wordIndex))
+    sodium.crypto_hash_sha512_update(state, value)
+  }
+  // trailing space is part of the login_server implementation
+  const clearPassphrase = passphrase.slice(0, PHRASE_WORD_COUNT).join(' ') + ' '
+  sodium.crypto_hash_sha512_update(state, Buffer.from(clearPassphrase))
+  const outputHashBuffer = Buffer.alloc(sodium.crypto_hash_sha512_BYTES)
+  sodium.crypto_hash_sha512_final(state, outputHashBuffer)
+
+  const pubKey = Buffer.alloc(sodium.crypto_sign_PUBLICKEYBYTES)
+  const privKey = Buffer.alloc(sodium.crypto_sign_SECRETKEYBYTES)
+
+  sodium.crypto_sign_seed_keypair(
+    pubKey,
+    privKey,
+    outputHashBuffer.slice(0, sodium.crypto_sign_SEEDBYTES),
+  )
+
+  return [pubKey, privKey]
+}
+
+export async function upgrade(queryFn: (query: string, values?: any[]) => Promise<Array<any>>) {
+  // Delete data with no reference in login_users table
+  // eslint-disable-next-line no-console
+  // 663 affected rows
+  const userBackups = await queryFn(
+    `SELECT passphrase, LOWER(HEX(pubkey)) as pubkey, user_id
+     FROM login_user_backups
+     LEFT JOIN login_users ON login_user_backups.user_id = login_users.id
+     WHERE user_id=1503`,
+     // WHERE pubkey is not null`, // todo fix this condition and regenerate
+  )
+  let i = 0
+  // eslint-disable-next-line no-console
+  userBackups.forEach(async (userBackup) => {
+    const passphrase = userBackup.passphrase.split(' ')
+    const keyPair = KeyPairEd25519Create(passphrase)
+    if (keyPair[0].toString('hex') !== userBackup.pubkey) {
+      i++
+      // eslint-disable-next-line no-console
+      console.log(
+        'Missmatch Pubkey',
+        i,
+        userBackup.user_id,
+        `"${userBackup.passphrase}"`,
+        `"${keyPair[0].toString('hex')}`,
+        `"${userBackup.pubkey}"`,
+      )
+    } else {
+      // eslint-disable-next-line no-console
+      // console.log('SUCCESS: ', `"${keyPair[0].toString('hex')}`, `"${userBackup.pubkey}"`)
+    }
+  })
+}
+
+export async function downgrade(queryFn: (query: string, values?: any[]) => Promise<Array<any>>) {
+  return [] // cannot transform things back
+}
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diff --git a/database/integrity/README.md b/database/integrity/README.md
new file mode 100644
index 000000000..c960a270e
--- /dev/null
+++ b/database/integrity/README.md
@@ -0,0 +1,5 @@
+This is a test to find if all passphrases evaluate to the saved public key.
+
+You need `yarn add sodium-native` in order to make it work.
+
+This could be the start of database integrity tests in oder to evaluate the correctness of the database
\ No newline at end of file