Merge pull request #4882 from mempool/nymkappa/reset-pool-sha

[migration] reset mining pool sha to force refreshing

backend/src/api/database-migration.ts

@@ -655,6 +655,7 @@ class DatabaseMigration {
 
       await this.$executeQuery('TRUNCATE hashrates');
       await this.$executeQuery('TRUNCATE difficulty_adjustments');
+      await this.$executeQuery(`UPDATE state SET string = NULL WHERE name = 'pools_json_sha'`);
 
       await this.updateToSchemaVersion(75);
     }