fix fallback when trying insertion of already existing transaction

fixup: fetch transactions by number and not by id

move TransactionProcessingOutput to entity file

add endpoint for retrieving fraud status of existing an transaction

fix: really use connection pooling

fix: use connexion pooling

improve logging

solve pydantic deprecation warning

improve db connection functions

fix env variable loading

use context manager for db connection and adapt dependency injection

add default value to "is_real_fraud" field

code cleaning

fix exception type detection

fix: update transaction if fraud

store the ground truth about frauds

fixup: wrong metadata key

connect to the ML prediction API

authorize credit card numbers to be sent as int

send transaction info in the request body

add Brevo support

Initial commit