fix: add migration for overlays_json column on existing device_features tables

internal/storage/migrate.go

@@ -196,6 +196,9 @@ func migrate(db *sql.DB) error {
     if err := migrateAlarmWorkflow(db); err != nil {
         return err
     }
+    if err := migrateDeviceFeaturesOverlays(db); err != nil {
+        return err
+    }
     return migrateConfigVersions(db)
 }
 
@@ -465,6 +468,21 @@ func migrateAlarmWorkflow(db *sql.DB) error {
     return nil
 }
 
+func migrateDeviceFeaturesOverlays(db *sql.DB) error {
+    if db == nil {
+        return nil
+    }
+    has, err := hasColumn(db, "device_features", "overlays_json")
+    if err != nil {
+        return err
+    }
+    if has {
+        return nil
+    }
+    _, err = db.Exec(`ALTER TABLE device_features ADD COLUMN overlays_json TEXT NOT NULL DEFAULT '[]'`)
+    return err
+}
+
 func migrateConfigVersions(db *sql.DB) error {
     if db == nil {
         return nil