diff --git a/sql/migrations/state/0012_atx_coinbase_index.sql b/sql/migrations/state/0012_atx_coinbase_index.sql
new file mode 100644
index 0000000000..2b7d907ce6
--- /dev/null
+++ b/sql/migrations/state/0012_atx_coinbase_index.sql
@@ -0,0 +1 @@
+CREATE INDEX atxs_by_coinbase ON atxs (coinbase);
\ No newline at end of file