# Feature: System Initialization

## Description
System startup routine that initializes all dependent components in correct order. Loads configuration, initializes ML models, prepares database connections, sets up satellite cache, and loads place recognition indexes. This is called once at service startup.

## Component APIs Implemented
- `initialize_system() -> bool` - Executes full system initialization sequence

## External Dependencies
- **F17 Configuration Manager** - Configuration loading
- **F16 Model Manager** - ML model initialization (SuperPoint, LightGlue, LiteSAM, DINOv2)
- **F03 Flight Database** - Database connection initialization
- **F04 Satellite Data Manager** - Satellite cache initialization
- **F08 Global Place Recognition** - Faiss index loading

## Internal Methods

### Initialization Sequence
- `_load_configuration()` - Loads config via F17, validates required settings
- `_initialize_models()` - Initializes ML models via F16 with TensorRT optimization
- `_initialize_database()` - Sets up F03 database connections and schema
- `_initialize_satellite_cache()` - Prepares F04 cache with operational region data
- `_load_place_recognition_indexes()` - Loads F08 Faiss indexes into memory

### Health Checks
- `_verify_gpu_availability()` - Checks CUDA/TensorRT availability
- `_verify_model_loading()` - Validates all models loaded correctly
- `_verify_database_connection()` - Tests database connectivity
- `_verify_index_integrity()` - Validates Faiss indexes are loadable

### Error Handling
- `_handle_initialization_failure(component: str, error: Exception)` - Logs and handles component init failures
- `_rollback_partial_initialization()` - Cleans up on partial initialization failure

## Unit Tests
- Test initialize_system calls F17 config loading
- Test initialize_system calls F16 model initialization
- Test initialize_system calls F03 database initialization
- Test initialize_system calls F04 cache initialization
- Test initialize_system calls F08 index loading
- Test initialize_system returns False on config load failure
- Test initialize_system returns False on model init failure
- Test initialize_system returns False on database init failure
- Test initialization order is correct (config first, then models, etc.)
- Test partial initialization failure triggers rollback

## Integration Tests
- Test full system initialization with all real components
- Test system startup on cold start (no cached data)
- Test system startup with existing database
- Test initialization with GPU unavailable falls back gracefully
- Test initialization timeout handling
- Test system ready state after successful initialization
- Test re-initialization after failure recovery

