diff --git a/keyserver/src/database/migrations.js b/keyserver/src/database/migrations.js
--- a/keyserver/src/database/migrations.js
+++ b/keyserver/src/database/migrations.js
@@ -35,22 +35,31 @@
   for (const {
     version: idx,
     migrationPromise: migration,
+    migrationType,
   } of migrations.values()) {
     if (idx <= dbVersion) {
       continue;
     }
 
     try {
-      await startTransaction();
-      await migration();
-      await updateDBVersion(idx);
-      await commitTransaction();
+      if (migrationType === 'wrap_in_transaction_and_block_requests') {
+        await startTransaction();
+        await migration();
+        await updateDBVersion(idx);
+        await commitTransaction();
+      } else {
+        await migration();
+        await updateDBVersion(idx);
+      }
       console.log(`(node:${process.pid}) migration ${idx} succeeded.`);
     } catch (e) {
       const transactionExceptionMessage = String(getMessageForException(e));
       console.error(`(node:${process.pid}) migration ${idx} failed.`);
       console.error(transactionExceptionMessage);
-      await rollbackTransaction();
+
+      if (migrationType === 'wrap_in_transaction_and_block_requests') {
+        await rollbackTransaction();
+      }
       return false;
     }
   }