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2 options exist for this. "non-time-chart" means the data will not be an "over time" graph, but a snapshot of the data at a specific time. This is the most likely candidate for an SQL chart. "graph" is a data over time view, the time base is in unix epoc, the SQL query must return the time column in this format and "time_column" must be specified in the dataset telling it what the column is that holds the time value.
Customising the opCharts GUI
Changing the Blue Login Message
To change the text when logging in from the default of "Authentication required: default credentials are nmis/nm188", change the configuration option in opCommon.nmis, "auth_login_motd" to the required text.
Hiding View in NMIS Link
To hide the "view in nmis" button, change the configuration option in opCommon.nmis, "opcharts_gui_display_view_in_nmis" to false, by default this is true.
Hiding Modules List in Menu Bar
To hide the "Modules" menu item in the menu bar, change the configuration option in opCommon.nmis, "opcharts_gui_display_modules_list" to false, by default this is true.