Merged the "accounting.database" module into the "accounting" module. It has only one member as "db", the database instance, and does not need to be separated into another file.

src/accounting/currency/commands.py

@@ -24,8 +24,7 @@ import typing as t
 import click
 from flask.cli import with_appcontext
 
-from accounting import data_dir
-from accounting.database import db
+from accounting import db, data_dir
 from accounting.models import Currency, CurrencyL10n
 from accounting.utils.user import has_user, get_user_pk