# Migration Validation Framework Architecture

## Components

- CLI: parses operator commands and coordinates workflows.
- Collectors: gather mounts, services, and disk usage from target systems.
- Snapshot files: JSON evidence used as immutable migration checkpoints.
- Comparator: evaluates drift between before and after snapshots.
- Reports: stores JSON or HTML output for audit and review.

## Data Flow

```
Operator
  -> python3 cli.py collect
  -> collectors over SSH
  -> before.json / after.json
  -> python3 cli.py compare
  -> diff.json with PASS/FAIL validation
```

## Validation Flow

```
before.json -> Comparator -> service checks
after.json  -> Comparator -> filesystem checks -> validation result
                         -> mount checks
```

The framework keeps collection and comparison separate so migration evidence can be reviewed, archived, and replayed without recollecting from production systems.