These modules enable the application to define the models and connect to the database:

# The database connections and session management are managed with SQLAlchemy functions
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, ForeignKey, Float
from sqlalchemy.orm import sessionmaker, relationship
# The Geometry columns of the data tables are added to the ORM using the Geometry data type
from geoalchemy2 import Geometry