# BAT-015 Planning

## Scope

- Implement and verify REQ-019 Docker network MCP deployment.
- Preserve existing stdio MCP compatibility while enabling `streamable-http` runtime mode.
- Deploy `jarca-ledger` as an independent Docker service with Synology bind volume.
- Migrate the existing operating DB from `jarca` to `jarca-ledger` with backup/snapshot evidence.
- Refresh deployment runbook and baseline docs.

## Design Gate

- Required: yes
- Rationale: this batch changes runtime topology, deployment ownership, exposed MCP transport, Docker health behavior, and operating DB location. A design/evidence trail is required even though the code diff is small.

## Work plan

1. Add MCP runtime config helpers for stdio/sse/streamable-http transport selection.
2. Add tests for default stdio, streamable-http env config, and invalid transport rejection.
3. Add Dockerfile, `.dockerignore`, compose service, healthcheck, and runbook.
4. Build and run `jarca-ledger` with `/volume1/docker/jarca-ledger/data:/data`.
5. Verify network MCP using a streamable-http client against `http://192.168.55.253:8000/mcp`.
6. Snapshot existing `jarca` DB with SQLite backup API, back up the new empty DB, replace `/data/ledger.sqlite3`, restart, and verify table counts/integrity.
7. Update StagePilot Discovery/SRS/BAT/baseline docs.