save the value of a variable in the LM

[admin]

You can use storage for any kind of data. For example you can store a Lua table there, where each table key is year-month pair:

Code:

key = os.date('%Y-%m') -- YYYY-MM format
value = 123 -- current value

values = storage.get('values', {})
values[ key ] = value
storage.set('values', values)