-- Create a conf table
SELECT cartodb.cdb_conf_setconf('cds', '{"Manolo Escobar": {"El Limonero":"En stock", "Viva el vino":"Sin stock"}}');
 cdb_conf_setconf 
------------------
 
(1 row)

-- Test key retrieval
SELECT cartodb.cdb_conf_getconf('cds');
                              cdb_conf_getconf                              
----------------------------------------------------------------------------
 {"Manolo Escobar": {"El Limonero":"En stock", "Viva el vino":"Sin stock"}}
(1 row)

-- Test returns NULL if key doesn't exist
SELECT cartodb.cdb_conf_getconf('no existe');
 cdb_conf_getconf 
------------------
 
(1 row)