Where can I find what each metric_id in the database corresponds to?

Hi,

We are writing a custom plugin where we need to graph metrics over the entire history for a build type.

I understand that this is stored in the build_data_storage table as build_id, metric_id, metric_value

Here is a sample from our database for a given build.

build_id    metric_id    metric_value
3019    -6371738409877395985    119313
3019    -4924562750898875443    1
3019    -3896958621569208557    1
3019    -3888535176583481057    1843
3019    -2913913962870227706    72
3019    -2703241747681962594    2018
3019    -2671230126101543203    18337
3019    -704913538714156794    80
3019    2142046045481688914    425
3019    2499376200604796440    91
3019    2873035392072723275    626
3019    3014510524022395756    14693911
3019    5485618390749745482    68
3019    5744866293795496522    216
3019    5923324090471097048    2573
3019    6492160027654944357    73

Where can I find what each metric_id corresponds to? For example what corresponds to number of classes, number of covered classes, etc?
The reason for using SQL is that we have around 40+ projects with over 300 builds per day and we want to see some data for atleast a few weeks.
We need to compare metrics on branches, etc.

Can someone tell me as to what metric id corresponds to what?

Thanks