fix: add db migration script

scripts/20240215_retain-workflow-in-mrf-submissions/retain-workflow-in-mrf-submissions.js

@@ -0,0 +1,49 @@
+/* eslint-disable */
+
+// Creates a new workflow key in all existing mrf submissions, populated with
+// the form's existing workflow. From this point on, workflows should be captured
+// when the submission is initially created (i.e. the workflow is started),
+
+// BEFORE
+// COUNT existing number of MRF submissions with no workflow key 
+db.submissions.countDocuments({
+  submissionType: 'multirespondentSubmission',
+  workflow: { $exists: false },
+})
+
+// UPDATE
+db.submissions.aggregate([
+  {
+    $match: {
+      submissionType: 'multirespondentSubmission',
+    },
+  },
+  {
+    $lookup: {
+      from: 'forms',
+      localField: 'form',
+      foreignField: '_id',
+      as: 'forms',
+    },
+  },
+  {
+    $addFields: {
+      workflow: { $first: '$forms.workflow' },
+    },
+  },
+  {
+    $merge: {
+      into: 'submissions',
+      on: '_id',
+      whenNotMatched: 'discard',
+    },
+  },
+])
+
+// AFTER
+// Count number of MRF submissions with workflow key
+// Expect this to match the COUNT in BEFORE
+db.submissions.countDocuments({
+  submissionType: 'multirespondentSubmission',
+  workflow: { $exists: true },
+})