diff --git a/migrations/000.336.sql b/migrations/000.336.sql
new file mode 100644
index 0000000..af75de5
--- /dev/null
+++ b/migrations/000.336.sql
@@ -0,0 +1,2 @@
+-- Add index for addresses in the samples table
+CREATE INDEX ix_samples_address_id ON samples(address_id);