InvoicePlane

About

I use InvoicePlane for my client invoicing. Self-hosted CodeIgniter app, no subscription and nobody else holding my billing history.

1.5.11 → 1.7.1 goes in one pass. The release ships every migration from 000_1.0.0.sql to 041_1.7.0.sql and applies whatever isn't already in ip_versions. No need to stage through 1.6.
Version lives in the database, not the code. To tell what a checkout is, look at the highest file in application/modules/setup/sql/.
Wiki says PHP <= 8.1 and the Dockerfile is php:8.1-fpm, but composer.json has no php constraint and their CI tests 8.2/8.3/8.4. Fine on 8.3.
ipconfig.php header changed. 1.5.11 used phpdotenv v2, 1.7.1 uses v5, which chokes on the bare PHP guard — white screen, InvalidFileException. Needs the # in front:

<?php exit('No direct script access allowed'); ?>      # 1.5.11
# <?php exit('No direct script access allowed'); ?>    # 1.7.1

CI_ENV=production is required. index.php defaults ENVIRONMENT to development, which force-enables display_errors and overrides php.ini — stack traces in public. The 1.5.11 config predates the key, so editing the old file in place leaves it out. Better to start from the 1.7.1 file and paste the old values in.
Keep ENCRYPTION_KEY identical or stored encrypted values stop decrypting.
LEGACY_CALCULATION=true keeps pre-1.6.3 VAT math so old invoice totals don't move. Simple mode is only for EU e-invoicing.
Setup's prerequisite screen checks PHP >= 5.6 and date.timezone and nothing else — it never checks extensions. Verify gd/bcmath/intl against the FPM pool yourself, not the CLI.
Release zip bundles vendor/, so no composer on the host. Only custom files were assets/core/css/custom.css, custom-pdf.css and the favicon.