Finally got a working solution. Posted the basic custom module below for anyone else who comes across this thread.

define(['angular', 'require'], function(angular, require) {
'use strict';

var userModule = angular.module('userModule', ['maUiApp']);

userModule.component('userComponent', {
    bindings: {},
    controller: ['$scope', '$http', 
        function($scope, $http){
            $scope.msg = null;
            $scope.sendPost = function(point_xid, date_from, date_to, email_recipients){
                var from = JSON.stringify(date_from);
                var to = JSON.stringify(date_to);
                var emails = JSON.stringify(email_recipients);
                var script = "send_HTTP_debug(point_xid, " + from + ", " + to + ", " + emails + ")"

                var address= "/rest/v2/script/run";
                var content = {'Content-Type': 'application/json;charset=UTF-8'};
                var data = {
                      "context": [
                        {
                          "contextUpdate": true,
                          "variableName": "point_xid",
                          "xid": point_xid
                        },
                      ],
                      "logLevel": "DEBUG",
                      "permissions": [
                        "admin"
                      ],
                      "script": script,
                      "wrapInFunction": true
                };
                function success(response){$scope.msg=response;};
                function error(response){$scope.msg=response;};

                $http.post(address, JSON.stringify(data),content).then(success, error);
            };
        }],
    template: '\
    <div flex layout="column">\
        <md-input-container md-no-float="">\
            <label>Point</label>\
            <ma-point-list ng-model="point" query="query_tmpVal" start="start_tmpVal" limit="limit_tmpVal" sort="sort_tmpVal"></ma-point-list>\
        </md-input-container>\
        <div flex layout="row">\
            <md-input-container style="flex-grow:1">\
            <label>From</label>\
                <ma-date-picker ng-model="date_from" mode="date" format="DD/MM/YYYY"></ma-date-picker>\
            </md-input-container>\
            <div style="width="10vw">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</div>\
            <md-input-container style="flex-grow:1">\
                <label>To</label>\
                <ma-date-picker ng-model="date_to" mode="date" format="DD/MM/YYYY"></ma-date-picker>\
            </md-input-container>\
        </div>\
        <md-input-container>\
            <ma-email-recipients ng-model="email_recipients"></ma-email-recipients>\
        </md-input-container>\
        <md-button class="md-primary md-raised" ng-click="sendPost(point.xid, date_from, date_to, email_recipients)">Request Report</md-button>\
        <p>{{msg}}</p>\
    </div>\
    '
});

return userModule;

}); // define

@terrypacker Just updated the module and saw that you added the filename regex, thanks so much!

Perfect, thanks @terrypacker! I'll try that and update this post.

update 1:
The H2 database shell doesn't recognise LIKE in CREATE TABLE. It may not be supported, The H2 command info for CREATE DATABASE doesn't show LIKE - https://www.h2database.com/html/commands.html#create_table

update 2
I just did a DELETE FROM EVENTS; instead.

So yeah, there might have been a few too many events... 12 million. The database has gone from ~6 Gb to 76 Mb.