WIP: support for storing rate limits configuration

server/extension/sql/15_config_helper.sql

@@ -16,6 +16,24 @@ RETURNS JSON AS $$
     SELECT VALUE FROM cartodb.cdb_conf WHERE key = input_key;
 $$ LANGUAGE SQL STABLE SECURITY DEFINER;
 
+CREATE OR REPLACE
+FUNCTION cartodb.CDB_Conf_SetConf(key text, value JSON)
+    RETURNS void AS $$
+BEGIN
+    PERFORM cartodb.CDB_Conf_RemoveConf(key);
+    EXECUTE 'INSERT INTO cartodb.CDB_CONF (KEY, VALUE) VALUES ($1, $2);' USING key, value;
+END
+$$ LANGUAGE PLPGSQL VOLATILE;
+
+CREATE OR REPLACE
+FUNCTION cartodb.CDB_Conf_RemoveConf(key text)
+    RETURNS void AS $$
+BEGIN
+    EXECUTE 'DELETE FROM cartodb.CDB_CONF WHERE KEY = $1;' USING key;
+END
+$$ LANGUAGE PLPGSQL VOLATILE;
+
+
 CREATE OR REPLACE FUNCTION cdb_dataservices_server._get_geocoder_config(username text, orgname text, provider text DEFAULT NULL)
 RETURNS boolean AS $$
   cache_key = "user_geocoder_config_{0}".format(username)