• Enabled txsub system to work if/when underlying horizon db connection is read only. (4418)
• Optimize the claimable balance SQL query for best index query plan performance(4398)

DB Schema Migration

There is a new migration step added in this release, it makes the following schema changes:

• creates new, history_transactions_filtered_tmp table related to enabling tx sub processing on read only, only ingest writes to the table. Deprecates, drops prior txsub_results table. Migration should be brief, does not incur any data/runtime processing.