So, I'm very proficient with the API, but this requires a little more detail, because it's very confusing.

So, based only on the information provided by the API, I want to extract the trendings from a table. For that, I'm trying to do the following path:
ConnectApp > GetParametersForElement (which ones are defined externally) > GetTableForParameter > GetTrendDataForTableParameter

Until the last step, everything is fine. But the return from GetTableForParameter is as follows:
(this is a single line. Imagine a few hundred of those)

{'DataMinerID': <censored_value>, 'ElementID': <censored_value>, 'ParameterID': 8002, 'Index': -1, 'IndexValue': '<censored_value>', 'DisplayIndex': -1, 'DisplayIndexValue': <censored_name>, 'TrendKey': '<censored_value>', 'Position': 88, 'AlarmState': 'Normal', 'Cells': None, 'LastChangeUTC': 1764363757771}

GetTrendDataForTableParameter requires a "tableIndex". In that field, I tried to use 'DisplayIndexValue', but the API says I'm wrong, with:

{'Message': 'Received invalid trend data.', 'StackTrace': '', 'ExceptionType': 'Skyline.DataMiner.Web.Common.WebApiException'}

I would guess its 'DisplayIndex', but every single one is -1. So, I'm not sure which of those I should try instead.