fix: drop redundant db indexes (#2329)

* fix: drop redundant db indexes

* fix: explicitly add down

Author: rafaelcr

migrations/1753205522199_drop-duplicate-indexes.js

@@ -0,0 +1,17 @@
+/* eslint-disable camelcase */
+
+exports.shorthands = undefined;
+
+exports.up = pgm => {
+  pgm.dropIndex('ft_balances', ['token']);
+  pgm.dropIndex('mempool_txs', ['sender_address']);
+  pgm.dropIndex('mempool_txs', ['sponsor_address']);
+  pgm.dropIndex('nft_events', ['asset_identifier']);
+};
+
+exports.down = pgm => {
+  pgm.createIndex('ft_balances', ['token']);
+  pgm.createIndex('mempool_txs', ['sender_address']);
+  pgm.createIndex('mempool_txs', ['sponsor_address']);
+  pgm.createIndex('nft_events', ['asset_identifier']);
+};