Backend

The backend layer handles all communication with external systems and exposes utilities consumed by the services layer.

Modules

Module	Responsibility
config.py	Loads and exposes application configuration
database.py	PostgreSQL connection pool and query helpers
fetch_experiment_ids.py	Lightweight query for available experiment IDs
generic.py	Shared utility functions (transformation, formatting)
logger_config.py	Centralised setup_logger() factory
ml.py	Feature preparation and input validation for ML models
model_handler.py	Dispatches inference requests to the correct model
model_io.py	Serialises and deserialises model artefacts from disk
prediction_db.py	Persists sensor readings and prediction results
websocket.py	WebSocket client with paginated batch fetching