chore: add script to extract opt-in helpers from database dump

scripts/extract_optin_helpers.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+jq '[
+  JOIN(
+    INDEX(
+      .[] | select(
+        .model == "app.helper"
+      );
+      .pk | tostring
+    );
+    .[] | select(
+      .model == "feedback.feedback"
+      and .fields.next_year
+    );
+    .pk | tostring;
+    .[0].fields as $feedback
+    | .[1].fields as $helper
+    | {
+      "name": $helper.name,
+      "next_year": $feedback.next_year,
+      "phone": $helper.phone,
+    }
+  )
+]'