tsdb: fix SET command validation by adding tsdb- prefix support

include/ProxySQL_Statistics.hpp

@@ -160,6 +160,7 @@ class ProxySQL_Statistics {
 	// Variable management
 	bool set_variable(const char *name, const char *value);
 	char *get_variable(const char *name);
+	bool has_variable(const char *name);
 	char **get_variables_list();
 
 	bool MySQL_Threads_Handler_timetoget(unsigned long long);

lib/Admin_Handler.cpp

@@ -1109,6 +1109,8 @@ bool is_valid_global_variable(const char *var_name) {
 		return true;
 	} else if (strlen(var_name) > 6 && !strncmp(var_name, "admin-", 6) && SPA->has_variable(var_name + 6)) {
 		return true;
+	} else if (strlen(var_name) > 5 && !strncmp(var_name, "tsdb-", 5) && GloProxyStats && GloProxyStats->has_variable(var_name + 5)) {
+		return true;
 	} else if (strlen(var_name) > 5 && !strncmp(var_name, "ldap-", 5) && GloMyLdapAuth && GloMyLdapAuth->has_variable(var_name + 5)) {
 		return true;
 	} else if (strlen(var_name) > 13 && !strncmp(var_name, "sqliteserver-", 13) && GloSQLite3Server && GloSQLite3Server->has_variable(var_name + 13)) {

lib/ProxySQL_Statistics.cpp

@@ -183,6 +183,16 @@ char **ProxySQL_Statistics::get_variables_list() {
     return list;
 }
 
+bool ProxySQL_Statistics::has_variable(const char *name) {
+    if (name == NULL) return false;
+    if (!strcasecmp(name, "enabled")) return true;
+    if (!strcasecmp(name, "sample_interval")) return true;
+    if (!strcasecmp(name, "retention_days")) return true;
+    if (!strcasecmp(name, "monitor_enabled")) return true;
+    if (!strcasecmp(name, "monitor_interval")) return true;
+    return false;
+}
+
 ProxySQL_Statistics::~ProxySQL_Statistics() {
 	if (stmt_insert_tsdb_metric) {
 		(*proxy_sqlite3_finalize)(stmt_insert_tsdb_metric);