session: V1 sessions in non-git directories hidden after V2 migration (project_id stays 'global') #55633

Summary

After upgrading from V1 to V2, sessions created in a non-git directory (e.g. $HOME) are no longer listed by /session when launching OpenCode from that same directory. The V1 sessions were migrated into session_v2 with project_id = 'global', but V2 creates a new directory-based project for the same path, so the session list (filtered by project) only shows sessions created after the upgrade.

Environment

• opencode version: 2.0.29
• OS: Darwin 27.0.0 (macOS, arm64)
• Terminal: VS Code integrated terminal (TERM=xterm-256color, COLORTERM=truecolor)
• Shell: /bin/zsh
• Install/channel: latest
• Active plugins: none in config ("plugin": []); one legacy local file ~/.config/opencode/plugin/done-sound.js

Reproduction

1. With V1, create sessions while running opencode in a non-git directory (e.g. ~). V1 stores them under project global.
2. Upgrade to V2 and let the V1→V2 data migration complete (kv migration.v1-v2 = {"phase":"completed"}).
3. Run opencode from the same directory (~) and open /session.

Expected Behavior

V1 sessions created in ~ appear in the session list, as they did in V1.

Actual Behavior

Only sessions created after the upgrade are listed. In the database:

• session_v2 has 71 rows with directory = '/Users/<user>' and project_id = 'global' (all migrated from V1).
• V2 created a new project 30b4af67… with worktree = '/Users/<user>' on first launch; new sessions in ~ use this project ID.
• /session filters by the new project ID, so all 71 migrated sessions are hidden.

Sessions in git repositories migrated correctly (project ID matches).

Additional Context

• Database is ~27 GB; migration otherwise completed. One unrelated warning: Skipped V1 migration row reason=invalid-part observedType=tool.
• Workaround: manually UPDATE session_v2 SET project_id = '<new id>' WHERE project_id = 'global' AND directory = '<dir>'.
• Suggested fix: during migration (or project resolution), map V1 global-project sessions to the V2 directory project for their directory, or have the session list include global sessions whose directory matches the current location.