SQLAlchemy metadata is not acutally added to the extension

[brassy-endomorph]

Is your feature request related to a problem? Please describe.

We create a naming convention for indices, but we don't add it to the SQLAlchemy extension

hushline/hushline/db.py

Lines 4 to 14 in 53c65ee

	metadata = MetaData(
	naming_convention={
	"ix": "ix_%(column_0_label)s",
	"uq": "uq_%(table_name)s_%(column_0_name)s",
	"ck": "ck_%(table_name)s_%(constraint_name)s",
	"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
	"pk": "pk_%(table_name)s",
	}
	)
	db = SQLAlchemy()

Describe the solution you'd like

1. Add it
2. Autogenerate a new migrations so that existing indices pick up the new naming convention