Command-tag customization

session summary

After testing the newly committed REPACK command and confirming that it is transactional but takes an access-exclusive lock, the group built a prototype for customizable command-completion tags such as schema-qualified table names. A first server-only change broke psql's parser, exposing the need for client/server capability negotiation. The agent then used the existing _pq_ protocol-options framework so only requesting clients receive the new format. They reviewed compatibility tests and concluded the patch was useful for discussion but needed cleanup before pgsql-hackers.

timecodes

1. 00:30 Testing the new REPACK command
2. 13:30 REPACK locking and transaction behavior
3. 18:30 Designing descriptive command tags
4. 24:00 Prototype-first agentic implementation
5. 34:00 Server-only format change breaks psql
6. 35:30 Why protocol feature negotiation is required
7. 59:00 Using the _pq_ protocol-options framework
8. 01:06:00 Compatibility review and patch cleanup