Operate

Storage and recovery

Understand durable messages, audits, workspaces, archives, restore, and deletion.

Conversation state and workspace files are separate.

Data	Active storage	Durable or cold storage
Canonical conversation and execution	Agent Durable Object	Encrypted R2 segments
Public events, approvals, and audits	Thread Control SQLite	Compressed R2 ledger segments
Workspace files and Git state	Workspace Durable Object	R2 blobs and checkpoints
Thread list	D1	Rebuildable from manifests
Sandbox filesystem	Live Sandbox	R2 backups
Attachments and large results	SQLite metadata	Encrypted R2 objects

The transcript engine is internal. Normal application code uses thread APIs, not transcript-engine classes.

Files

Files written in /workspace are synchronized to durable workspace storage. Every completed coding turn records a tree hash, Git state, changed files, diff, checks, environment hash, and artifact references. A replacement Sandbox restores the last complete checkpoint from R2.

Read old sessions

Use thread history and event APIs for normal reads. Use authenticated JSONL export for a complete portable archive. Import and restore verify hashes before they create live thread state.

Deleting a thread cascades through transcript state, projections, D1 indexes, R2 archives, attachments, child threads, schedules, audits, processes, and workspace state.