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This PR fixes two bugs about database.
config.py read env values before loading .env file
pilot/database/config.py loads environment variable at project startup. This may set variables in config.py before executing the load_dotenv function in main.py. In this case, the database settings in .env file will not take effect.
sqlite database not created
pilot/database/database.py will not create sqlite database in create_database function. If DATABASE_TYPE equals "sqlite", create_database will not create the database file.
code reformat
Reformat postgres.py and db_init.py