This hotfix locks in backward compatibility for SQLite stores created before 0.15.0.
- Added regression fixtures based on legacy schema-v1 and schema-v2 stores.
- Verified that opening a legacy store adds
messages.deleted_atwithout deleting or tombstoning existing messages. - Verified that schema-v1 stores also gain
summary_nodes.strategyand advance to schema version 2 automatically. - Behavioral reads continue to expose legacy message content after migration.
- No manual migration is required.
- Existing databases are upgraded additively on first open; legacy messages remain live.