cache_keys: fix prefix deletion

rhodecode/lib/rc_cache/cache_key_meta.py

@@ -39,11 +39,12 b' def free_cache_keys(*args):'
     if cache_keys_by_pid:
         try:
             for cache_proc in cache_keys_by_pid:
-                CacheKey.query().filter(CacheKey.cache_key.startswith(cache_proc)).delete()
+                like_expression = '{}%'.format(cache_proc)
+                CacheKey.query().filter(CacheKey.cache_key.like(like_expression)).delete()
                 cache_keys_by_pid.remove(cache_proc)
             Session().commit()
         except Exception:
-            log.warn('Failed to clear keys, exiting gracefully')
+            log.exception('Failed to clear keys, exiting gracefully')
 
 
 atexit.register(free_cache_keys)