fix: panic on non-unique index name
Summary
- fix: panic on non-unique index name
- we didn't check that index name is unique in indexes meta table. That led to panics when index with same name was created for two tables.
- previous commit set wrong sbroad submodule. Set sbroad submodule to correct commit
- Close #611 (closed)
- Changes should be cherry-picked to 24.2: no
- Docs follow-up: not necessary