fix: forks should exit

src/state.c

@@ -1,5 +1,6 @@
 #include <log.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "types.h"
 
@@ -619,7 +620,7 @@ bool state_background_write(SharedContext *context,
   }
 
   log_info("(state) background writing stopped by main thread (pid: %d)", pid);
-  return false;
+  exit(EXIT_SUCCESS);
 }
 
 void state_init(SharedContext *context, const StateConfig *state_config,