create_app factory

Blueprints in separate files

Extensions init_app pattern

Custom exception hierarchy

Consistent error envelope

Generic exception handler logs errors

DB teardown with teardown_appcontext

DB connection via flask.g

Config supports testing

Error handlers registered in factory

Test fixtures

create_app factory

Blueprints for routes

before_request sets request ID on g

after_request returns response with request ID

Custom exception hierarchy

Consistent error envelope

Extensions init_app pattern

Error handlers in factory

Generic exception handler logs error

Config from environment

Per-request state on g not globals

create_app factory

Blueprints in separate files

Blueprints registered in factory

Custom exception hierarchy

Consistent error envelope

CLI command registered in factory

Extensions init_app pattern

Error handlers registered centrally

Generic exception handler

Config supports testing

Imports inside factory

create_app factory

Config classes

Blueprints in separate files

Blueprints registered in factory

Custom exception hierarchy

Consistent error envelope

Extensions init_app pattern

Request logging with before/after hooks

Generic exception handler

Error handlers registered centrally

Test fixtures use factory with testing config

create_app factory

Blueprints for routes

Blueprints registered in factory

Custom exception classes

Consistent error envelope

register_error_handlers called in factory

Generic exception handler with logging

Extensions in extensions.py with init_app

Config from environment

Test fixtures use factory

Routes raise exceptions not return errors