diff --git a/lidiabrowser/lidia/models.py b/lidiabrowser/lidia/models.py
index 8d82619..1b7c1a7 100644
--- a/lidiabrowser/lidia/models.py
+++ b/lidiabrowser/lidia/models.py
@@ -189,3 +189,15 @@ class Meta:
     def __str__(self):
         lidiaterm = self.lidiaterm.term if self.lidiaterm else None
         return f"{self.articleterm}/{lidiaterm}"
+
+
+def delete_all() -> None:
+    """Delete all objects in lidia app."""
+
+    Publication.objects.all().delete()
+    Language.objects.all().delete()
+    BaseAnnotation.objects.all().delete()
+    ArticleTerm.objects.all().delete()
+    LidiaTerm.objects.all().delete()
+    Category.objects.all().delete()
+    TermGroup.objects.all().delete()
diff --git a/lidiabrowser/sync/management/commands/populate.py b/lidiabrowser/sync/management/commands/populate.py
index 2679e5b..52f9500 100644
--- a/lidiabrowser/sync/management/commands/populate.py
+++ b/lidiabrowser/sync/management/commands/populate.py
@@ -1,10 +1,20 @@
-from django.core.management.base import BaseCommand
+from django.core.management.base import BaseCommand, CommandParser
 
 from sync.populate import populate
+from lidia.models import delete_all
 
 
 class Command(BaseCommand):
     help = "Parse raw sync content and populate LIDIA models"
 
+    def add_arguments(self, parser: CommandParser) -> None:
+        parser.add_argument(
+            "--refresh",
+            action="store_true",
+            help="First remove annotations from database to solve any sync problems"
+        )
+
     def handle(self, *args, **options):
+        if options["refresh"]:
+            delete_all()
         populate()
diff --git a/lidiabrowser/sync/management/commands/sync.py b/lidiabrowser/sync/management/commands/sync.py
index 79af966..fb2d1df 100644
--- a/lidiabrowser/sync/management/commands/sync.py
+++ b/lidiabrowser/sync/management/commands/sync.py
@@ -1,10 +1,20 @@
-from django.core.management.base import BaseCommand
+from django.core.management.base import BaseCommand, CommandParser
 
 from sync.zoterosync import sync
+from sync.models import delete_all
 
 
 class Command(BaseCommand):
     help = "Synchronize with data on the Zotero server"
 
+    def add_arguments(self, parser: CommandParser) -> None:
+        parser.add_argument(
+            "--refresh",
+            action="store_true",
+            help="First remove sync information from database to solve any sync problems"
+        )
+
     def handle(self, *args, **options):
+        if options["refresh"]:
+            delete_all()
         sync()
diff --git a/lidiabrowser/sync/models.py b/lidiabrowser/sync/models.py
index ded08b0..323dcc2 100644
--- a/lidiabrowser/sync/models.py
+++ b/lidiabrowser/sync/models.py
@@ -32,3 +32,10 @@ class Sync(models.Model):
 
     def __str__(self):
         return f"Library #{self.library_id}"
+
+
+def delete_all() -> None:
+    """Delete all objects in sync app."""
+    Publication.objects.all().delete()
+    Annotation.objects.all().delete()
+    Sync.objects.all().delete()