diff --git a/deploy/mariadb/init/001-schema.sql b/deploy/mariadb/init/001-schema.sql
index e5efc36..0120a6c 100644
--- a/deploy/mariadb/init/001-schema.sql
+++ b/deploy/mariadb/init/001-schema.sql
@@ -1290,4 +1290,26 @@ VALUES
     0,
     86400,
     0
-);
\ No newline at end of file
+);
+
+UPDATE detection_rules
+SET description = ''
+WHERE description IS NULL;
+
+UPDATE detection_rules
+SET match_field = ''
+WHERE match_field IS NULL;
+
+UPDATE detection_rules
+SET match_operator = ''
+WHERE match_operator IS NULL;
+
+UPDATE detection_rules
+SET match_value = ''
+WHERE match_value IS NULL;
+
+ALTER TABLE detection_rules
+MODIFY description TEXT NULL,
+MODIFY match_value TEXT NULL,
+MODIFY match_field VARCHAR(64) NOT NULL DEFAULT '',
+MODIFY match_operator VARCHAR(16) NOT NULL DEFAULT '';
\ No newline at end of file
diff --git a/main.go b/main.go
index f175454..5419863 100644
--- a/main.go
+++ b/main.go
@@ -761,10 +761,21 @@ func main() {
 
 func (s *server) listDynamicRules(ctx context.Context) ([]DynamicRule, error) {
 	const q = `
-SELECT id, name, description, severity, channel, event_ids,
-       match_field, match_operator, match_value,
-       threshold_count, threshold_window_seconds, suppress_for_seconds,
-       enabled, created_at, updated_at
+SELECT id,
+       name,
+       COALESCE(description, ''),
+       severity,
+       channel,
+       event_ids,
+       COALESCE(match_field, ''),
+       COALESCE(match_operator, ''),
+       COALESCE(match_value, ''),
+       threshold_count,
+       threshold_window_seconds,
+       suppress_for_seconds,
+       enabled,
+       created_at,
+       updated_at
 FROM detection_rules
 ORDER BY name ASC
 `