Add queryuser.most_recent_digest

This commit adds a new queryuser.most_recent_digest column which will be
used for storing the ID of the message that was last sent to a user for
a query / user combination. This will then be used in conjunction with
most_recent_seen to establish what messages should be included in a
digest

migrations/20201022124658-20201022613846-add-queryuser-most-recent-digest.js

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+'use strict';
+
+var dbm;
+var type;
+var seed;
+var fs = require('fs');
+var path = require('path');
+var Promise;
+
+/**
+  * We receive the dbmigrate dependency from dbmigrate initially.
+  * This enables us to not have to rely on NODE_PATH.
+  */
+exports.setup = function(options, seedLink) {
+  dbm = options.dbmigrate;
+  type = dbm.dataType;
+  seed = seedLink;
+  Promise = options.Promise;
+};
+
+exports.up = function(db) {
+  var filePath = path.join(__dirname, 'sqls', '20201022124658-20201022613846-add-queryuser-most-recent-digest-up.sql');
+  return new Promise( function( resolve, reject ) {
+    fs.readFile(filePath, {encoding: 'utf-8'}, function(err,data){
+      if (err) return reject(err);
+      console.log('received data: ' + data);
+
+      resolve(data);
+    });
+  })
+  .then(function(data) {
+    return db.runSql(data);
+  });
+};
+
+exports.down = function(db) {
+  var filePath = path.join(__dirname, 'sqls', '20201022124658-20201022613846-add-queryuser-most-recent-digest-down.sql');
+  return new Promise( function( resolve, reject ) {
+    fs.readFile(filePath, {encoding: 'utf-8'}, function(err,data){
+      if (err) return reject(err);
+      console.log('received data: ' + data);
+
+      resolve(data);
+    });
+  })
+  .then(function(data) {
+    return db.runSql(data);
+  });
+};
+
+exports._meta = {
+  "version": 1
+};

migrations/sqls/20201022124658-20201022613846-add-queryuser-most-recent-digest-down.sql

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+ALTER TABLE queryuser DROP COLUMN most_recent_digest;

migrations/sqls/20201022124658-20201022613846-add-queryuser-most-recent-digest-up.sql

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+ALTER TABLE queryuser ADD COLUMN most_recent_digest INTEGER;