diff --git a/sql/migrations/015_add_adapters_last_error.sql b/sql/migrations/015_add_adapters_last_error.sql
new file mode 100644
index 0000000..88e18a5
--- /dev/null
+++ b/sql/migrations/015_add_adapters_last_error.sql
@@ -0,0 +1,6 @@
+-- Migration: 015_add_adapters_last_error
+-- Adds last_error column for adapter-side error reporting.
+-- Populated by supervisor when an adapter fails to start or apply config.
+
+ALTER TABLE config.adapters
+ADD COLUMN last_error TEXT;