diff --git a/server/migrations/003_combat_state.sql b/server/migrations/003_combat_state.sql
new file mode 100644
index 0000000..082b57a
--- /dev/null
+++ b/server/migrations/003_combat_state.sql
@@ -0,0 +1 @@
+ALTER TABLE campaigns ADD COLUMN IF NOT EXISTS combat_state JSON NULL DEFAULT NULL;