diff --git a/src/migrations/m20240529_000001_add_relation_unique_index.rs b/src/migrations/m20240529_000001_add_relation_unique_index.rs
new file mode 100644
index 00000000..c3c253fc
--- /dev/null
+++ b/src/migrations/m20240529_000001_add_relation_unique_index.rs
@@ -0,0 +1,31 @@
+use sea_orm_migration::prelude::*;
+
+use super::m20240524_000002_create_relations_likes_shares::Relations;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+	async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+		manager
+			.create_index(
+				Index::create()
+					.unique()
+					.name("index-relations-follower-following")
+					.table(Relations::Table)
+					.col(Relations::Following)
+					.col(Relations::Follower)
+					.to_owned()
+				)
+			.await?;
+		Ok(())
+	}
+
+	async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+		manager
+			.drop_index(Index::drop().name("index-relations-follower-following").table(Relations::Table).to_owned())
+			.await?;
+		Ok(())
+	}
+}
diff --git a/src/migrations/mod.rs b/src/migrations/mod.rs
index f97d3ec9..a8831e1b 100644
--- a/src/migrations/mod.rs
+++ b/src/migrations/mod.rs
@@ -5,6 +5,7 @@ mod m20240524_000002_create_relations_likes_shares;
 mod m20240524_000003_create_users_auth_and_config;
 mod m20240524_000004_create_addressing_deliveries;
 mod m20240524_000005_create_attachments_tags_mentions;
+mod m20240529_000001_add_relation_unique_index;
 
 pub struct Migrator;
 
@@ -17,6 +18,7 @@ impl MigratorTrait for Migrator {
 			Box::new(m20240524_000003_create_users_auth_and_config::Migration),
 			Box::new(m20240524_000004_create_addressing_deliveries::Migration),
 			Box::new(m20240524_000005_create_attachments_tags_mentions::Migration),
+			Box::new(m20240529_000001_add_relation_unique_index::Migration),
 		]
 	}
 }