Fixed knex connection pool errors when scheduling a posts

no issue

- A subquery in mege service that creates email record wasn't using 'options' object needed to track transactions

core/server/api/canary/posts.js

@@ -155,7 +155,7 @@ module.exports = {
                         let postEmail = model.relations.email;
 
                         if (!postEmail) {
-                            const email = await mega.addEmail(model.toJSON());
+                            const email = await mega.addEmail(model.toJSON(), frame.options);
                             model.set('email', email);
                         } else if (postEmail && postEmail.get('status') === 'failed') {
                             const email = await mega.retryFailedEmail(postEmail);

core/server/services/mega/mega.js

@@ -57,7 +57,7 @@ const sendTestEmail = async (postModel, emails) => {
  *
  * @param {object} post JSON object
  */
-const addEmail = async (post) => {
+const addEmail = async (post, options) => {
     const {members} = await membersService.api.members.list(Object.assign({filter: 'subscribed:true'}, {limit: 'all'}));
     const {emailTmpl, emails} = getEmailData(post, members);
 
@@ -77,7 +77,7 @@ const addEmail = async (post) => {
             html: emailTmpl.html,
             plaintext: emailTmpl.plaintext,
             submitted_at: moment().toDate()
-        });
+        }, {transacting: options.transacting});
     } else {
         return existing;
     }