Dolt Backend for Beads

May 30, 2026 · View on GitHub

Beads uses Dolt as its storage backend. Dolt provides a version-controlled SQL database with cell-level merge, native branching, and two deployment modes.

Why Dolt?

Native version control — cell-level diffs and merges, not line-based
Multi-writer support — server mode enables concurrent agents
Built-in history — every write creates a Dolt commit
Native branching — Dolt branches independent of git branches
Single-binary option — embedded mode for solo users (no server needed)

Embedded mode includes everything in the bd binary; no separate Dolt install is needed. Install the standalone dolt CLI only when you want to run server mode or work directly with the database via dolt sql.

# macOS
brew install dolt

# Linux
curl -L https://github.com/dolthub/dolt/releases/latest/download/install.sh | bash

# Verify installation
dolt version

New Project

# Embedded mode (single writer, no server — default for standalone)
bd init

# Server mode (multi-writer, e.g. orchestrator)
gt dolt start           # Start the Dolt server
bd init --server        # Initialize with server mode

Migrate from SQLite (Legacy)

If upgrading from an older version that used SQLite:

Note: The bd migrate --to-dolt command was removed in v0.58.0. For pre-0.50 installations with JSONL data, use the migration script:
scripts/migrate-jsonl-to-dolt.sh
See Troubleshooting if you encounter connection errors after migration.

Migration creates backups automatically. Your original SQLite database is preserved as beads.backup-pre-dolt-*.db.

Modes of Operation

Embedded Mode (Solo / Standalone)

In-process Dolt engine — no separate server needed. This is the default for standalone Beads users. The bd binary includes everything; just bd init and go.

Single-writer (one process at a time)
Data lives in .beads/embeddeddolt/ alongside your code
Push to GitHub with bd dolt push — code and issues in one repo
Zero ops: no server, no ports, no PID files

Server Mode (Multi-Writer / Orchestrator)

Connects to a running dolt sql-server for multi-client access.

# Start the server (orchestrator)
gt dolt start

# Or manually
cd ~/.dolt-data/beads && dolt sql-server --port 3307

# Initialize in server mode
bd init --server

# Or switch via environment variable
export BEADS_DOLT_SERVER_MODE=1

# .beads/config.yaml (server mode settings)
dolt:
  mode: server
  host: 127.0.0.1
  port: 3307
  user: root

Switch to server mode when you need:

Multiple agents writing simultaneously
Orchestrator multi-rig setups
Federation with remote peers

Migrating Between Backends

You can migrate data between embedded mode and server mode using bd backup. Both directions preserve full Dolt commit history.

bd export is not a substitute for this flow. JSONL exports contain issue records from the issues table for migration and interoperability; they do not capture Dolt branches, full commit history, working-set state, or non-issue tables. Use bd backup or a manual Dolt backup when you need a restorable database backup.

Server → Embedded

Create a backup from the server-mode project:

# In the server-mode project directory
bd backup init /path/to/backup-dir
bd backup sync

Create a new embedded-mode project and restore:
```
mkdir new-project && cd new-project
bd init                  # creates an embedded-mode project by default
bd backup restore --force /path/to/backup-dir
```
--force overwrites the freshly-initialized database with the backup contents. The restore automatically:
- Updates metadata.json to match the restored project identity
- Registers the backup directory for future bd backup sync
- Backfills the embedded migration tracker (schema_migrations)
Verify:
```
bd list
bd backup status
```

Embedded → Server

Create a backup from the embedded-mode project:

# In the embedded-mode project directory
bd backup init /path/to/backup-dir
bd backup sync

Create a new server-mode project and restore:

mkdir new-project && cd new-project
bd init --server         # creates a server-mode project
bd backup restore --force /path/to/backup-dir

Verify:
```
bd list
bd backup status
```

Backup Commands Reference

Command	Description
`bd backup init <path>`	Register a backup destination (filesystem or DoltHub URL)
`bd backup sync`	Push database to the configured backup destination
`bd backup restore [path]`	Restore from a backup directory (`--force` to overwrite)
`bd backup remove`	Unregister the backup destination
`bd backup status`	Show backup configuration and last sync time

Notes

Data locations differ between modes: .beads/embeddeddolt/ (embedded) vs .beads/dolt/ (server)
The backup directory is a full Dolt backup, not an issues.jsonl export — it can be on a local drive, NAS, or DoltHub
You can also migrate via Dolt remotes (bd dolt push / bd dolt pull) if both projects share a remote

The sections below are the canonical backend migration reference.

Federation (Peer-to-Peer Sync)

Federation enables direct sync between Dolt installations without a central hub.

Architecture

┌─────────────────┐         ┌─────────────────┐
│  Workspace A    │◄───────►│  Workspace B    │
│  dolt sql-server│  sync   │  dolt sql-server│
│  :3306 (sql)    │         │  :3306 (sql)    │
│  :8080 (remote) │         │  :8080 (remote) │
└─────────────────┘         └─────────────────┘

In federation mode, the server exposes two ports:

MySQL (3306): Multi-writer SQL access
remotesapi (8080): Peer-to-peer push/pull

Quick Start

# Add a peer
bd federation add-peer town-beta 192.168.1.100:8080/beads

# With authentication
bd federation add-peer town-beta host:8080/beads --user sync-bot

# Sync with all peers
bd federation sync

# Handle conflicts
bd federation sync --strategy theirs  # or 'ours'

# Check status
bd federation status

Topologies

Pattern	Description	Use Case
Hub-spoke	Central hub, satellites sync to hub	Team with central coordination
Mesh	All peers sync with each other	Decentralized collaboration
Hierarchical	Tree of hubs	Multi-team organizations

Credentials

Peer credentials are AES-256 encrypted, stored locally, and used automatically during sync:

# Credentials prompted interactively
bd federation add-peer name url --user admin

# Stored in federation_peers table (encrypted)

Troubleshooting

# Check federation health
bd doctor --deep

# Verify peer connectivity
bd federation status

Dolt Remotes

Use bd dolt remote add to configure remotes. This ensures the running Dolt SQL server sees the remote immediately. Remotes added directly with the dolt CLI are written to filesystem config and may not be visible to the server until restart.

# DoltHub (public or private)
bd dolt remote add origin https://doltremoteapi.dolthub.com/org/beads

# S3
bd dolt remote add origin aws://[bucket]/path/to/repo

# GCS
bd dolt remote add origin gs://[bucket]/path/to/repo

# Git SSH (GitHub, GitLab, etc.)
bd dolt remote add origin git+ssh://git@github.com/org/repo.git

# Local file system
bd dolt remote add origin file:///path/to/remote

Push/Pull

bd dolt push
bd dolt pull

For SSH remotes, bd dolt push and bd dolt pull automatically use the dolt CLI instead of the SQL server to avoid MySQL connection timeouts during transfer.

bd dolt remote add registers the remote on both the SQL server and the filesystem CLI config. This ensures CLI-backed dolt push/dolt pull can find the remote. If either surface already has a remote with that name, the command prompts before overwriting.

Sharing a Git repo: Dolt stores data under refs/dolt/data, separate from standard Git refs (refs/heads/, refs/tags/). You can safely point a git+ssh:// remote at the same repository as your project source code. See Dolt Git Remotes.

List/Remove Remotes

bd dolt remote list            # Shows configured remotes
bd dolt remote remove origin   # Removes the remote

Use bd doctor --fix to resolve discrepancies between SQL and CLI remote config.

Contributor Onboarding (Clone Bootstrap)

When someone clones a repository that uses Dolt backend:

Run bd bootstrap in the clone
If the git remote has refs/dolt/data (pushed via bd dolt push), bd bootstrap auto-detects it and clones the database from the remote
Work continues normally — all existing issues are available

No manual steps required beyond bd bootstrap. The auto-detect:

Probes origin for refs/dolt/data
Clones the Dolt database from the remote (instead of creating a fresh one)
Configures the Dolt remote for future bd dolt push/pull

If sync.remote is set in .beads/config.yaml, that takes precedence over auto-detection. Any Dolt-compatible remote URL is supported (DoltHub, S3, GCS, file, or git). On brand-new projects, bd init auto-detects git origin and persists it as sync.remote, so the first bd dolt push publishes Dolt history to refs/dolt/data on the same git remote.

Verifying Bootstrap Worked

bd list              # Should show issues
bd vc log            # Should show initial commit

Troubleshooting

Server Not Running

Symptom: Connection refused errors when using server mode.

failed to create database: dial tcp 127.0.0.1:3307: connect: connection refused

Fix:

gt dolt start        # Orchestrator command
# Or
gt dolt status       # Check if running

Bootstrap Not Running

Symptom: bd list shows nothing on fresh clone.

Check:

ls .beads/dolt/            # Should NOT exist (pre-bootstrap)
BD_DEBUG=1 bd list         # See bootstrap output

Force bootstrap:

rm -rf .beads/dolt         # Remove broken state
bd list                    # Re-triggers bootstrap

Database Corruption

Symptom: Queries fail, inconsistent data.

Diagnosis:

bd doctor                  # Basic checks
bd doctor --deep           # Full validation
bd doctor --server         # Server mode checks (if applicable)

Recovery options:

Repair what's fixable:
```
bd doctor --fix
```

Rebuild from remote:

rm -rf .beads/dolt
bd list                  # Re-triggers bootstrap

Already Committed `.beads/dolt/` to Git

If you accidentally committed a Dolt data directory:

Update gitignore: bd doctor --fix
Remove it from git tracking: git rm --cached -r .beads/dolt/ (or .beads/embeddeddolt/)
Commit the removal: git commit -m "fix: remove accidentally committed dolt data"
To purge from history, use BFG Repo-Cleaner or git filter-repo

Lock Contention (Embedded Mode)

Symptom: "database is locked" errors.

Embedded mode is single-writer (enforced via file lock). If you need concurrent access, switch to server mode. See Migrating Between Backends.

Configuration Reference

# .beads/config.yaml

# Dolt settings
dolt:
  # Auto-commit Dolt history after writes (default: on for embedded, off for server)
  auto-commit: on        # on | off

  # Storage mode (default: embedded)
  mode: embedded         # embedded | server
  # Server mode settings (only used when mode: server)
  host: 127.0.0.1
  port: 3307
  user: root
  # Password: env var or credentials file (see below)

  # Shared server mode (GH#2377): all projects share a single Dolt server
  # at ~/.beads/shared-server/. Each project uses its own database (prefix-based).
  # Eliminates port conflicts and reduces resource usage on multi-project machines.
  shared-server: false   # true | false

Environment Variables

Variable	Purpose
`BEADS_DOLT_PASSWORD`	Server mode password (highest priority)
`BEADS_CREDENTIALS_FILE`	Path to credentials file (overrides default location)
`BEADS_DOLT_SERVER_MODE`	Enable server mode (set to "1")
`BEADS_DOLT_SERVER_HOST`	Server host (default: 127.0.0.1)
`BEADS_DOLT_SERVER_PORT`	Server port (default: 3307, or 3308 in shared mode)
`BEADS_DOLT_SERVER_TLS`	Enable TLS (set to "1" or "true")
`BEADS_DOLT_SERVER_USER`	MySQL connection user
`BEADS_DOLT_SHARED_SERVER`	Enable shared server mode (set to "1" or "true")
`DOLT_REMOTE_USER`	Push/pull auth user
`DOLT_REMOTE_PASSWORD`	Push/pull auth password
`BD_DOLT_AUTO_COMMIT`	Override auto-commit setting

Credentials File

For multi-server setups, you can store passwords in an INI-style credentials file instead of juggling environment variables per project. Passwords are looked up by [host:port] section, so each project automatically gets the right password based on its configured server.

Password resolution order:

BEADS_DOLT_PASSWORD env var (highest priority, existing behavior)
Credentials file lookup by [host:port] (using the resolved runtime port)
Empty string (no password)

Port resolution note: The [host:port] used for credential lookup matches the resolved runtime port (from the port file, env var, or config — in that priority order), not necessarily the port stored in metadata.json. This matters when using IAP tunnels: if your tunnel maps remote:3307 to localhost:3308, store your password under [127.0.0.1:3308] and the credentials file will match the actual connection.

Default location: ~/.config/beads/credentials (Linux/macOS), %APPDATA%\beads\credentials (Windows)

Override location: Set BEADS_CREDENTIALS_FILE env var.

File format:

# ~/.config/beads/credentials
[127.0.0.1:3307]
password=localDevPassword

[beads.company.com:3307]
password=teamServerPassword

[10.0.1.50:3308]
password=officePassword

Permissions: On Linux/macOS, a warning is printed to stderr if the file is readable by group or others (mirrors ssh behavior). Set permissions with:

chmod 600 ~/.config/beads/credentials

Dolt Version Control

Dolt maintains its own version history, separate from Git:

# View Dolt commit history
bd vc log

# Show diff between Dolt commits
bd vc diff HEAD~1 HEAD

# Create manual checkpoint
bd vc commit -m "Checkpoint before refactor"

Auto-Commit Behavior

In embedded mode (standalone default), each bd write command creates a Dolt commit:

bd create "New issue"    # Creates issue + Dolt commit

In server mode (orchestrator), auto-commit defaults to OFF because the server manages its own transaction lifecycle. Firing DOLT_COMMIT after every write under concurrent load causes 'database is read only' errors.

Override for batch operations (embedded) or explicit commits (server):

bd --dolt-auto-commit off create "Issue 1"
bd --dolt-auto-commit off create "Issue 2"
bd vc commit -m "Batch: created issues"

Server Management (Orchestrator)

The orchestrator provides integrated Dolt server management:

gt dolt start            # Start server (background)
gt dolt stop             # Stop server
gt dolt status           # Show server status
gt dolt logs             # View server logs
gt dolt sql              # Open SQL shell

Server runs on port 3307 (avoids MySQL conflict on 3306).

Standalone-to-managed-city handoff

When an existing standalone project is later added to a managed city or orchestrator, avoid letting two Dolt servers become sources of truth for the same beads database name. A common split-brain symptom is that .beads/dolt-server.port points at the old standalone server while the shell environment points bd at the managed server with BEADS_DOLT_PORT or BEADS_DOLT_SERVER_PORT.

Check before migrating:

bd doctor
bd dolt status

bd doctor warns when the runtime managed port differs from the local port file. The warning is intentionally diagnostic only; do not delete the local port file until the standalone store has been exported and imported into the managed server.

Safe manual handoff:

# From the standalone project, without managed-city port overrides:
unset BEADS_DOLT_PORT BEADS_DOLT_SERVER_PORT
bd backup
bd export > /tmp/beads-standalone.jsonl
bd dolt stop

# Then enter the managed-city environment and import into its Dolt server:
bd import /tmp/beads-standalone.jsonl
bd doctor

After bd doctor shows one healthy store and the imported issue count is correct, archive the old local Dolt data directory instead of deleting it immediately. Keep the backup until the managed city has been pushed or otherwise snapshotted.

Shared Server Mode

On machines with multiple beads projects, each project normally starts its own Dolt server. Shared server mode runs a single Dolt server at ~/.beads/shared-server/ that serves all projects:

# Enable for this project
bd dolt set shared-server true

# Or enable machine-wide via environment variable
export BEADS_DOLT_SHARED_SERVER=1

# Or enable during init
bd init --prefix myproject --shared-server

Benefits:

No port conflicts between projects (single server on port 3308, avoids orchestrator on 3307)
Reduced resource usage (one process instead of many)
Automatic database isolation (each project uses its own database name)

How it works:

Server state files (PID, port, lock, log) live in ~/.beads/shared-server/
Dolt data directory: ~/.beads/shared-server/dolt/
Each project's database is stored as a subdirectory (e.g., ~/.beads/shared-server/dolt/myproject/)
The file lock mechanism ensures safe concurrent access from multiple projects
Default port is 3308 (not 3307) to avoid conflict with the orchestrator. Override with BEADS_DOLT_SERVER_PORT or dolt.port in config.yaml

Important: Each project on a shared server must have a unique prefix (database name). Two projects with the same prefix share the same database — if this happens accidentally, the project identity check will detect the mismatch and refuse to connect, preventing silent data corruption. Always use distinct prefixes when running bd init --shared-server.

# Check shared server status from any project
bd dolt status

# Show full configuration including shared mode
bd dolt show

Data Location (Orchestrator)

<town-root>/.dolt-data/
├── hq/                  # Town beads (hq-*)
├── my-project/          # Project rig (mp-*)
├── beads/               # Beads rig (bd-*)
└── other-project/       # Other rig (op-*)

Central Dolt Server (macOS LaunchAgent)

If you do not use the orchestrator but still want a single persistent Dolt server for multiple projects on macOS, run a custom LaunchAgent instead of spawning per-project embedded instances.

Why Not `brew services start dolt`?

After installing Dolt with brew install dolt, the natural next step is brew services start dolt. However, the Homebrew formula runs dolt sql-server without the --config flag, and Dolt does not auto-discover config.yaml from its working directory. The config file must be passed explicitly with --config <file>.

Setup with a Custom LaunchAgent

Install Dolt and initialize its data directory:

brew install dolt
cd /opt/homebrew/var/dolt && dolt init

Configure Dolt for port 3307:

# /opt/homebrew/var/dolt/config.yaml
log_level: info

listener:
  host: 127.0.0.1
  port: 3307
  max_connections: 100

behavior:
  autocommit: true

Create the LaunchAgent plist:

cat > ~/Library/LaunchAgents/com.local.dolt-server.plist << 'EOF'
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.local.dolt-server</string>
    <key>ProgramArguments</key>
    <array>
        <string>/opt/homebrew/bin/dolt</string>
        <string>sql-server</string>
        <string>--config</string>
        <string>/opt/homebrew/var/dolt/config.yaml</string>
    </array>
    <key>WorkingDirectory</key>
    <string>/opt/homebrew/var/dolt</string>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
    <key>StandardOutPath</key>
    <string>/opt/homebrew/var/log/dolt.log</string>
    <key>StandardErrorPath</key>
    <string>/opt/homebrew/var/log/dolt-error.log</string>
</dict>
</plist>
EOF

Load and verify the service:

launchctl load ~/Library/LaunchAgents/com.local.dolt-server.plist
mysql -h 127.0.0.1 -P 3307 -u root -e "SELECT 1"

Point beads at the central server:

export BEADS_DOLT_SERVER_MODE=1
export BEADS_DOLT_SERVER_PORT=3307

Manage the service:

# Stop
launchctl unload ~/Library/LaunchAgents/com.local.dolt-server.plist

# Restart
launchctl unload ~/Library/LaunchAgents/com.local.dolt-server.plist
launchctl load ~/Library/LaunchAgents/com.local.dolt-server.plist

# Check logs
tail -f /opt/homebrew/var/log/dolt.log

Advanced Dolt Usage

The dolt CLI lets you operate directly on the database for power-user workflows. The data directory depends on your mode: .beads/embeddeddolt/ (embedded) or .beads/dolt/ (server).

Branching

cd .beads/dolt   # or .beads/embeddeddolt for embedded mode
dolt branch feature-x
dolt checkout feature-x

Time Travel

dolt log
dolt checkout <commit-hash>
dolt sql -q "SELECT * FROM issues"

Diff and Blame

dolt diff main feature-x
dolt blame issues

Migration Cleanup

After successful migration from SQLite, you may have backup files:

.beads/beads.backup-pre-dolt-20260122-213600.db
.beads/sqlite.backup-pre-dolt-20260123-192812.db

These are safe to delete once you've verified Dolt is working:

# Verify Dolt works
bd list
bd doctor

# Then clean up (after appropriate waiting period)
rm .beads/*.backup-*.db

Recommendation: Keep backups for at least a week before deleting.