fix: register debug_toolbar in INSTALLED_APPS when DEBUG is on - #161
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MIDDLEWARE conditionally added debug_toolbar's middleware when DEBUG is True, but INSTALLED_APPS never registered the app itself -- git history shows this pairing existed before and the INSTALLED_APPS half got dropped somewhere along this repo's messy merge/revert history. Broke every build since (confirmed via 3 failed CI runs today, all at the same step): the sanity-check step's `manage.py check` runs with DEBUG defaulting to True (no DEBUG env var set), and any request/check path that touches debug_toolbar's models crashes with "Model class debug_toolbar.models.HistoryEntry doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS" -- the middleware imports the app's models without the app being registered.
saqibmanan
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Sep 11, 2026
…-apps-dev fix: register debug_toolbar in INSTALLED_APPS (dev companion to #161)
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Why
Blocking today's attempt to trigger a real prod deploy — every "Build and push image" run failed at the sanity-check step (`manage.py check` with DEBUG defaulting True):
```
RuntimeError: Model class debug_toolbar.models.HistoryEntry doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
```
`MIDDLEWARE` conditionally adds debug_toolbar's middleware when `DEBUG` is True, but `INSTALLED_APPS` never registered the app itself. Checked git history — this pairing existed before (`if DEBUG: INSTALLED_APPS += ["debug_toolbar"]`) and the `INSTALLED_APPS` half got dropped somewhere along this repo's messy merge/revert history (see #153).
Fix
Register the app alongside the middleware, same conditional.
Test plan