The old UI was two pages of raw pandas tables with no navigation, no styling
and no way to see a run's comments. This replaces it with a small,
testable application and a beer-themed design.
What changed
------------
Restructure
- The domain logic now lives in `brewing.py` as pure functions over plain
data, with no Flask or Mongo dependency. The gravity maths, the ABV
formula and the run-aggregation rules are unit-testable on their own.
- `app_factory.py` replaces the module-level app, and the routes move into
blueprints under `views/`. A request-scoped Mongo repository is created per
request and closed at teardown.
- `mongo/repository.py` replaces `build_db.py` / `query_db.py` / `get_conn.py`.
Reading a document no longer requires a second query to fetch the fields.
Interface
- A dark, beer-themed design system: warm amber `#be7f39` on near-black, a
condensed display face (Anton) for headings and Inter for body text. Both
fonts and the chart library are vendored into `static/`, so the container
needs no outbound network at runtime — the old templates pulled Bootstrap
from a CDN.
- A real navigation bar, a login page, a brew-process page with a proper
form, and a run-detail page listing every reading with its comment.
- The run summary tables now show the beer name and the latest comment, which
the old pandas tables did not.
- Native form controls (checkbox, number spinners, date icon, scrollbars)
are restyled for the dark theme.
Correctness
- The alcohol calculation now uses the standard homebrew formula,
`(OG - FG) x 131.25`. The old code used `(max - min) / 7.36 + 0.5`, which is
not a recognised brewing formula and overstated every result.
- Gravity points and decimal readings now convert correctly in both
directions (`1039` <-> `1.039`).
- A run's display name resolves to the most-used label across its readings,
because `beer_type` is stored per-reading and drifts across a run.
- Re-submitting a reading for the same run and day updates it in place
rather than creating a duplicate.
Security / production
- The container ran the Werkzeug debugger with `FLASK_DEBUG=1`, exposing an
interactive console on any unhandled error. It now runs waitress with
debugging off.
- `SECRET_KEY` comes from the environment.
- The app secret is no longer a hard-coded string in source.
Housekeeping
- Removes the bokeh/duckdb/pandas dependency chain and the static file it
generated at import time; removes the dead `add_user.py` and `test.py`.
- Splits `requirements.txt` (runtime) from `requirements-dev.txt` (tests).
- Adds a pytest suite (64 tests) and a `test` job to the CI workflow so the
image is only built when the tests pass.
- Adds a README describing the data model and a RUNBOOK for the cluster side.
Data compatibility
------------------
The existing `beer_db.beer_data` documents are read as they are and are not
migrated or rewritten. No collection is dropped, and no document is modified
by this change other than through the explicit "record a reading" form, which
keeps the original `(date, beer_run_id)` uniqueness rule.
hermes
armistace