Expand description
SQLite-backed SessionStore.
Single-file durable backend suitable for self-hosted deployments and
the TUI’s persistent session DB. Schema versioning is intentionally
minimal. File-backed databases use the shared Harn SQLite schema marker;
pre-marker databases are upgraded from the original schema_version table
in the same initialization transaction. The Postgres backend (issue #2500)
follows the same shape so consumers can swap by config.