# Quickstart: Migration Process and UI Redesign

## Setup

1. **Install Dependencies**:
   ```bash
   pip install rapidfuzz sqlalchemy
   cd frontend && npm install
   ```

2. **Configure Environments**:
   Ensure you have at least two Superset environments configured in the application settings.

3. **Initialize Database**:
   The system will automatically create the `mappings.db` SQLite file on the first run.

## Usage

### 1. Define Mappings
1. Navigate to the **Database Mapping** tab.
2. Select your **Source** and **Target** environments.
3. Click **Fetch Databases**.
4. Review the **Suggested Mappings** (highlighted in green).
5. Manually adjust any mappings using the dropdowns.
6. Click **Save Mappings**.

### 2. Run Migration
1. Go to the **Migration** dashboard.
2. Select the **Source** and **Target** environments.
3. Select the assets (Dashboards/Datasets) you want to migrate.
4. Enable the **Replace Database** toggle.
5. Click **Start Migration**.
6. If a database is missing a mapping, a modal will appear prompting you to select a target database.

## Troubleshooting

- **Connection Error**: Ensure the backend can reach both Superset instances. Check credentials in settings.
- **Mapping Not Applied**: Verify that the "Replace Database" toggle was enabled and that the mapping exists for the specific environment pair.
- **Fuzzy Match Failure**: If names are too different, manual mapping is required. The system learns from manual overrides.