How to use Counter Types?

[Deep1998]

I was trying to test out the counter type but i don't see documentation around how to configure the spanner tables for it nor a limitation.

Tried the following configuration spanner but the proxy throws an error on startup:

INSERT INTO TableConfigurations (KeySpaceName,  TableName,  ColumnName,  ColumnType, IsPrimaryKey, PK_Precedence)
VALUES('testkeyspace', 'counter_table', 'id' ,'int', true, 1);

INSERT INTO TableConfigurations (KeySpaceName,  TableName,  ColumnName,  ColumnType, IsPrimaryKey, PK_Precedence)
VALUES('testkeyspace', 'counter_table', 'val' ,'counter', false,0);