Group same contributions without URL, make grouping more precise

app/utils/contribution-grouping-key.js

@@ -1,14 +1,29 @@
+import ethers from 'ethers';
 import { isEmpty } from '@ember/utils';
 
 // Derives a stable grouping key for a contribution, so that contributions
 // created for the same issue/pull request (one per contributor) can be
 // linked together in the UI.
 //
-// Until we have identical IPFS documents for different contributions, we will
-// use the URL as grouping key
+// The key is a 6-char keccak256 prefix of a combination of fields:
+// url (optional), description, date, amount, kind. When the URL is present
+// (bot contributions) it is included; when absent (manual contributions)
+// the remaining fields still produce a reliable key. All of description,
+// date, amount, and kind must be present — if any is missing, the
+// contribution is treated as a singleton (null key).
 
 export default function contributionGroupingKey (contribution) {
-  let url = contribution ? contribution.url : null;
-  if (isEmpty(url)) return null;
-  return url;
+  if (!contribution) return null;
+
+  const { url, description, date, amount, kind } = contribution;
+
+  if (isEmpty(description) || isEmpty(date) || isEmpty(amount) || isEmpty(kind)) {
+    return null;
+  }
+
+  const input = isEmpty(url)
+    ? `${description}|${date}|${amount}|${kind}`
+    : `${url}|${description}|${date}|${amount}|${kind}`;
+
+  return ethers.utils.id(input).slice(2, 8);
 }