## MODIFIED Requirements

### Requirement: Docker Compose configuration
The project SHALL include docker-compose.yml for simplified deployment orchestration.

#### Scenario: Service definition
- **WHEN** docker-compose.yml is parsed
- **THEN** defines service named 'candle-annotator' using Dockerfile from current directory

#### Scenario: Port mapping
- **WHEN** docker-compose up runs
- **THEN** maps host port 3000 to container port 3000

#### Scenario: Volume mounting for ML data
- **WHEN** docker-compose up runs
- **THEN** mounts named volume 'ml-data' to /app/ml-data in the candle-annotator container

#### Scenario: Frontend depends on PostgreSQL
- **WHEN** docker-compose up runs
- **THEN** the candle-annotator service starts only after the postgres service is healthy (`depends_on: postgres: condition: service_healthy`)

#### Scenario: Frontend DATABASE_URL
- **WHEN** the candle-annotator service starts
- **THEN** the `DATABASE_URL` environment variable is set to `postgresql://ml_user:ml_password@postgres:5432/candle_annotator`

#### Scenario: Restart policy
- **WHEN** container crashes or stops
- **THEN** docker-compose automatically restarts container unless explicitly stopped (restart: unless-stopped)

#### Scenario: No SQLite volume
- **WHEN** docker-compose.yml is parsed
- **THEN** there is no `candle-data` volume defined or mounted

### Requirement: Environment variable configuration
The project SHALL use environment variables for runtime configuration.

#### Scenario: .env.example file
- **WHEN** repository is cloned
- **THEN** includes .env.example file documenting all configurable environment variables with example values

#### Scenario: DATABASE_URL configuration
- **WHEN** `DATABASE_URL` environment variable is set
- **THEN** the Next.js application connects to the PostgreSQL database at the specified URL

#### Scenario: No DATABASE_PATH variable
- **WHEN** environment variables are inspected
- **THEN** there is no `DATABASE_PATH` variable (SQLite path is removed)

#### Scenario: PORT configuration
- **WHEN** PORT environment variable is set
- **THEN** Next.js server listens on specified port (default: 3000)

#### Scenario: NODE_ENV configuration
- **WHEN** NODE_ENV environment variable is set to 'production'
- **THEN** Next.js runs in production mode with optimizations enabled

### Requirement: Database persistence
The deployment SHALL ensure PostgreSQL data persists across container restarts.

#### Scenario: PostgreSQL volume
- **WHEN** docker-compose up runs
- **THEN** the `postgres-data` named volume is mounted to `/var/lib/postgresql/data` in the postgres container

#### Scenario: Container restart preserves data
- **WHEN** the postgres container is stopped and restarted
- **THEN** all database tables and data remain intact

#### Scenario: PostgreSQL database name
- **WHEN** the postgres service starts
- **THEN** the `POSTGRES_DB` environment variable is set to `candle_annotator`

### Requirement: Health check endpoint
The API SHALL provide a health check endpoint for container orchestration.

#### Scenario: Health check endpoint responds
- **WHEN** GET request sent to `/api/health`
- **THEN** system returns 200 status with JSON `{ status: 'ok', timestamp: <unix_timestamp> }`

#### Scenario: Database connection check
- **WHEN** GET request sent to `/api/health?check=db`
- **THEN** system attempts a PostgreSQL query and returns 200 if successful, 503 if database unavailable
