simbarag/docs/deployment.md

Deployment & Migrations Guide

This document covers database migrations and deployment workflows for SimbaRAG.

Migration Workflow

Migrations are managed by Aerich, the migration tool for Tortoise ORM.

Key Principles

1. Generate migrations in Docker - Aerich needs database access to detect schema changes
2. Migrations auto-apply on startup - Both startup.sh and startup-dev.sh run aerich upgrade
3. Commit migrations to git - Migration files must be in the repo for production deploys

Generating a New Migration

Development (Recommended)

With docker-compose.dev.yml, your local services/raggr directory is synced to the container. Migrations generated inside the container appear on your host automatically.

# 1. Start the dev environment
docker compose -f docker-compose.dev.yml up -d

# 2. Generate migration (runs inside container, syncs to host)
docker compose -f docker-compose.dev.yml exec raggr aerich migrate --name describe_your_change

# 3. Verify migration was created
ls services/raggr/migrations/models/

# 4. Commit the migration
git add services/raggr/migrations/
git commit -m "Add migration: describe_your_change"

Production Container

For production, migration files are baked into the image. You must generate migrations in dev first.

# If you need to generate a migration from production (not recommended):
docker compose exec raggr aerich migrate --name describe_your_change

# Copy the file out of the container
docker cp $(docker compose ps -q raggr):/app/migrations/models/ ./services/raggr/migrations/

Applying Migrations

Migrations apply automatically on container start via the startup scripts.

Manual application (if needed):

# Dev
docker compose -f docker-compose.dev.yml exec raggr aerich upgrade

# Production
docker compose exec raggr aerich upgrade

Checking Migration Status

# View applied migrations
docker compose exec raggr aerich history

# View pending migrations
docker compose exec raggr aerich heads

Rolling Back

# Downgrade one migration
docker compose exec raggr aerich downgrade

# Downgrade to specific version
docker compose exec raggr aerich downgrade -v 1

Deployment Workflows

Development

# Start with watch mode (auto-restarts on file changes)
docker compose -f docker-compose.dev.yml up

# Or with docker compose watch (requires Docker Compose v2.22+)
docker compose -f docker-compose.dev.yml watch

The dev environment:

• Syncs services/raggr/ to /app in the container
• Rebuilds frontend on changes
• Auto-applies migrations on startup

Production

# Build and deploy
docker compose build raggr
docker compose up -d

# View logs
docker compose logs -f raggr

# Verify migrations applied
docker compose exec raggr aerich history

Fresh Deploy (New Database)

On first deploy with an empty database, startup-dev.sh runs aerich init-db instead of aerich upgrade. This creates all tables from the current models.

For production (startup.sh), ensure the database exists and run:

# If aerich table doesn't exist yet
docker compose exec raggr aerich init-db

# Or if migrating from existing schema
docker compose exec raggr aerich upgrade

Troubleshooting

"No migrations found" on startup

The migrations/models/ directory is empty or not copied into the image.

Fix: Ensure migrations are committed and the Dockerfile copies them:

COPY migrations ./migrations

Migration fails with "relation already exists"

The database has tables but aerich doesn't know about them (fresh aerich setup on existing DB).

Fix: Fake the initial migration:

# Mark initial migration as applied without running it
docker compose exec raggr aerich upgrade --fake

Model changes not detected

Aerich compares models against the last migration's state. If state is out of sync:

# Regenerate migration state (dangerous - review carefully)
docker compose exec raggr aerich migrate --name fix_state

Database connection errors

Ensure PostgreSQL is healthy before running migrations:

# Check postgres status
docker compose ps postgres

# Wait for postgres then run migrations
docker compose exec raggr bash -c "sleep 5 && aerich upgrade"

File Reference

File	Purpose
services/raggr/pyproject.toml	Aerich config ([tool.aerich] section)
services/raggr/migrations/models/	Migration files
services/raggr/startup.sh	Production startup (runs aerich upgrade)
services/raggr/startup-dev.sh	Dev startup (runs aerich upgrade or init-db)
services/raggr/app.py	Contains TORTOISE_CONFIG

Quick Reference

Task	Command
Generate migration	docker compose -f docker-compose.dev.yml exec raggr aerich migrate --name name
Apply migrations	docker compose exec raggr aerich upgrade
View history	docker compose exec raggr aerich history
Rollback	docker compose exec raggr aerich downgrade
Fresh init	docker compose exec raggr aerich init-db