test: harden scripts/:hash/redeemers and governance-purpose coverage

src/fixtures/mainnet/scripts/hash-redeemers.ts

@@ -1,3 +1,4 @@
+import { expect } from 'vitest';
 import { getPaginationFixtures } from '../../../index.js';
 
 const paginationFixtures = getPaginationFixtures(
@@ -97,4 +98,19 @@ export default [
       },
     ],
   },
+  {
+    // the constitution guardrails script (fa24fb30…) has executed on every
+    // enacted parameter change and treasury withdrawal, but db-sync leaves
+    // propose redeemers unattributed, so the API finds no rows for it. a
+    // backend that attributes governance redeemers from the ledger lists
+    // those executions here. an empty page and propose-only rows both
+    // pass; any other purpose under this script fails.
+    id: 'scripts-hash-redeemers-guardrails-unattributed_f0c6fbe97beb',
+    testName: 'scripts/:hash/redeemers guardrails script governance executions',
+    endpoints: ['scripts/fa24fb305126805cf2164c161d852a0e7330cf988f1fe558cf7d4a64/redeemers'],
+    response: expect.toSatisfy(
+      (rows: { purpose: string }[]) =>
+        Array.isArray(rows) && rows.every(row => row.purpose === 'propose'),
+    ),
+  },
 ];

src/fixtures/mainnet/txs/tx-redeemers.ts

@@ -79,4 +79,30 @@ export default [
       },
     ]),
   },
+  {
+    // a mainnet parameter-change proposal: the constitution guardrails
+    // script executes with a propose redeemer. pins two current-API facts:
+    // the propose row is served ahead of the published schema, and
+    // script_hash is empty — db-sync does not attribute governance
+    // redeemers; a ledger-attributing backend returns the guardrails hash.
+    // both are accepted; any other value fails.
+    id: 'txs-redeemers-propose-purpose_c48e858a027e',
+    testName: 'txs/:hash/redeemers with a propose redeemer',
+    endpoints: ['txs/51f495aa23f4b3b3aa90afde4a0e67823bb7ac4ac65f5ffbb138373b863f2f74/redeemers'],
+    response: [
+      {
+        tx_index: 0,
+        purpose: 'propose',
+        script_hash: expect.toBeOneOf([
+          '',
+          'fa24fb305126805cf2164c161d852a0e7330cf988f1fe558cf7d4a64',
+        ]),
+        redeemer_data_hash: 'd36a2619a672494604e11bb447cbcf5231e9f2ba25c2169177edc941bd50ad6c',
+        datum_hash: 'd36a2619a672494604e11bb447cbcf5231e9f2ba25c2169177edc941bd50ad6c',
+        unit_mem: '478665',
+        unit_steps: '104574320',
+        fee: '35159',
+      },
+    ],
+  },
 ];