diff --git a/upub/core/src/model/job.rs b/upub/core/src/model/job.rs
index afcf15c..ff9d4cf 100644
--- a/upub/core/src/model/job.rs
+++ b/upub/core/src/model/job.rs
@@ -16,7 +16,6 @@ pub struct Model {
 	pub job_type: JobType,
 	pub actor: String,
 	pub target: Option<String>,
-	#[sea_orm(unique)]
 	pub activity: String,
 	pub payload: Option<String>,
 	pub published: ChronoDateTimeUtc,
diff --git a/upub/migrations/src/lib.rs b/upub/migrations/src/lib.rs
index 0465e1b..34c9e55 100644
--- a/upub/migrations/src/lib.rs
+++ b/upub/migrations/src/lib.rs
@@ -7,6 +7,7 @@ mod m20240524_000004_create_addressing_deliveries;
 mod m20240524_000005_create_attachments_tags_mentions;
 mod m20240529_000001_add_relation_unique_index;
 mod m20240605_000001_add_jobs_table;
+mod m20240606_000001_no_unique_index_on_job_activity;
 
 pub struct Migrator;
 
@@ -21,6 +22,7 @@ impl MigratorTrait for Migrator {
 			Box::new(m20240524_000005_create_attachments_tags_mentions::Migration),
 			Box::new(m20240529_000001_add_relation_unique_index::Migration),
 			Box::new(m20240605_000001_add_jobs_table::Migration),
+			Box::new(m20240606_000001_no_unique_index_on_job_activity::Migration),
 		]
 	}
 }
diff --git a/upub/migrations/src/m20240605_000001_add_jobs_table.rs b/upub/migrations/src/m20240605_000001_add_jobs_table.rs
index 112e65f..5a48e4c 100644
--- a/upub/migrations/src/m20240605_000001_add_jobs_table.rs
+++ b/upub/migrations/src/m20240605_000001_add_jobs_table.rs
@@ -43,7 +43,7 @@ impl MigrationTrait for Migration {
 					.col(ColumnDef::new(Jobs::JobType).small_integer().not_null())
 					.col(ColumnDef::new(Jobs::Actor).string().not_null())
 					.col(ColumnDef::new(Jobs::Target).string().null())
-					.col(ColumnDef::new(Jobs::Activity).string().not_null().unique_key())
+					.col(ColumnDef::new(Jobs::Activity).string().not_null())
 					.col(ColumnDef::new(Jobs::Payload).string().null())
 					.col(ColumnDef::new(Jobs::Published).date_time().not_null().default(Expr::current_timestamp()))
 					.col(ColumnDef::new(Jobs::NotBefore).date_time().not_null().default(Expr::current_timestamp()))
@@ -52,17 +52,6 @@ impl MigrationTrait for Migration {
 			)
 			.await?;
 
-		manager
-			.create_index(
-				Index::create()
-					.unique()
-					.name("index-jobs-activity")
-					.table(Jobs::Table)
-					.col(Jobs::Activity)
-					.to_owned()
-			)
-			.await?;
-
 		manager
 			.create_index(
 				Index::create()
diff --git a/upub/migrations/src/m20240606_000001_no_unique_index_on_job_activity.rs b/upub/migrations/src/m20240606_000001_no_unique_index_on_job_activity.rs
new file mode 100644
index 0000000..c26a0b9
--- /dev/null
+++ b/upub/migrations/src/m20240606_000001_no_unique_index_on_job_activity.rs
@@ -0,0 +1,37 @@
+use sea_orm_migration::prelude::*;
+
+use crate::m20240605_000001_add_jobs_table::Jobs;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+	async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+		manager
+			.drop_index(
+				Index::drop()
+					.name("index-jobs-activity")
+					.table(Jobs::Table)
+					.to_owned()
+			)
+			.await?;
+
+		Ok(())
+	}
+
+	async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+		manager
+			.create_index(
+				Index::create()
+					.unique()
+					.name("index-jobs-activity")
+					.table(Jobs::Table)
+					.col(Jobs::Activity)
+					.to_owned()
+			)
+			.await?;
+
+		Ok(())
+	}
+}
diff --git a/upub/worker/src/dispatcher.rs b/upub/worker/src/dispatcher.rs
index f073f3d..ae696db 100644
--- a/upub/worker/src/dispatcher.rs
+++ b/upub/worker/src/dispatcher.rs
@@ -104,6 +104,14 @@ impl JobDispatcher for Context {
 				restart!(now);
 			}
 
+			if let Ok(Some(_)) = model::activity::Entity::find_by_ap_id(&job.activity)
+				.one(self.db())
+				.await
+			{
+				tracing::info!("dropping already processed job '{}'", job.activity);
+				restart!(now);
+			}
+
 			let _ctx = self.clone();
 			pool.spawn(async move {
 				let res = match job.job_type {