diff --git a/backend/src/graphql/resolver/ContributionResolver.ts b/backend/src/graphql/resolver/ContributionResolver.ts
index a2b1a99fc..49c6ea379 100644
--- a/backend/src/graphql/resolver/ContributionResolver.ts
+++ b/backend/src/graphql/resolver/ContributionResolver.ts
@@ -584,6 +584,7 @@ export class ContributionResolver {
 
     // acquire lock
     const releaseLock = await TRANSACTIONS_LOCK.acquire()
+    console.log(`locked for confirmContribution ${id}`)
     const queryRunner = getConnection().createQueryRunner()
     await queryRunner.connect()
     await queryRunner.startTransaction('REPEATABLE READ') // 'READ COMMITTED')
@@ -593,7 +594,7 @@ export class ContributionResolver {
         .select('transaction')
         .from(DbTransaction, 'transaction')
         .where('transaction.userId = :id', { id: contribution.userId })
-        .orderBy('transaction.balanceDate', 'DESC')
+        .orderBy('transaction.id', 'DESC')
         .getOne()
       logger.info('lastTransaction ID', lastTransaction ? lastTransaction.id : 'undefined')
 
@@ -642,10 +643,11 @@ export class ContributionResolver {
       })
     } catch (e) {
       await queryRunner.rollbackTransaction()
-      logger.error(`Creation was not successful: ${e}`)
+      console.log(`Creation was not successful:`, e)
       throw new Error(`Creation was not successful.`)
     } finally {
       await queryRunner.release()
+      console.log(`release for confirmContribution ${id}`)
       releaseLock()
     }
 
diff --git a/backend/src/graphql/resolver/TransactionLinkResolver.ts b/backend/src/graphql/resolver/TransactionLinkResolver.ts
index 901c5936b..5ab23f2b0 100644
--- a/backend/src/graphql/resolver/TransactionLinkResolver.ts
+++ b/backend/src/graphql/resolver/TransactionLinkResolver.ts
@@ -171,6 +171,7 @@ export class TransactionLinkResolver {
     if (code.match(/^CL-/)) {
       // acquire lock
       const releaseLock = await TRANSACTIONS_LOCK.acquire()
+      console.log(`locked for redeemTransactionLink ${code}`)
       logger.info('redeem contribution link...')
       const queryRunner = getConnection().createQueryRunner()
       await queryRunner.connect()
@@ -312,6 +313,7 @@ export class TransactionLinkResolver {
         throw new Error(`Creation from contribution link was not successful. ${e}`)
       } finally {
         await queryRunner.release()
+        console.log(`release for redeemTransactionLink ${code}`)
         releaseLock()
       }
       return true
diff --git a/backend/src/graphql/resolver/TransactionResolver.ts b/backend/src/graphql/resolver/TransactionResolver.ts
index 344a61be1..51ec0faaa 100644
--- a/backend/src/graphql/resolver/TransactionResolver.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.ts
@@ -66,6 +66,7 @@ export const executeTransaction = async (
 
   // acquire lock
   const releaseLock = await TRANSACTIONS_LOCK.acquire()
+  console.log(`locked for executeTransaction ${amount.toString()} ${recipient.firstName}`)
 
   try {
     // validate amount
@@ -189,6 +190,7 @@ export const executeTransaction = async (
     logger.info(`finished executeTransaction successfully`)
     return true
   } finally {
+    console.log(`release for executeTransaction ${amount.toString()} ${recipient.firstName}`)
     releaseLock()
   }
 }