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Paddy 37c9642877 Initial commit: Arbeitsorte-Logger + data-safety/robustness/input work

Existing app (single-file Tkinter/ttkbootstrap desktop tool for logging
blood-drive work assignments and mapping them) plus the first round of
improvements:

- Data safety: atomic CSV writes (tmp + fsync + os.replace), rotating
  backups in data/backups/ (startup + before every change, keep 20),
  fallback to empty/backup on missing/empty/corrupt orte.csv.
- Geocoder robustness: per-item try/except so the worker thread survives
  failures; GeocodingUnavailable + one-time "service unreachable" dialog.
- Input: DateEntry calendar picker with parse_date() validation; manual
  lat/lon fields in the edit dialog; Tab 2 highlights/filters rows without
  coordinates and adds a right-click "Koordinaten suchen".
- Logging to data/app.log; shared autocomplete helpers; config constants;
  map fit_bounds.

docs/ describes current state, architecture, data model, setup (Linux Mint),
and the full improvement roadmap. data/orte.csv is gitignored for now.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

2026-09-07 18:28:28 +02:00

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Changelog

Notable changes to the app. Newest first.

2026-09-07 — data safety, robustness, easier input

Addressed the top three findings from improvements.md.

Data safety (`DataStore`)

All writes (append / update / delete) now rebuild the full DataFrame and go through _save_csv: rotating backup to data/backups/ (startup + before every change, keep 20, skip if unchanged) then atomic write (tmp + fsync + os.replace).
orte.csv missing / empty (EmptyDataError) / unreadable now falls back to an empty table or the newest backup instead of crashing.

Geocoder robustness (`GeocoderWorker`, `geocode_city`)

Each queue item runs inside try/except; a failing lookup or callback logs a traceback and the worker keeps going (previously an unexpected error killed the thread and silently froze all further geocoding).
geocode_city raises GeocodingUnavailable when every query failed on a service/network error. After 3 in a row the app shows a one-time "Standortdienst nicht erreichbar" dialog; entries still save without coordinates.

Easier, safer input

Date fields (entry form + edit dialog) are now ttkbootstrap.DateEntry calendar pickers, validated/normalized to ISO by parse_date() (also accepts TT.MM.JJJJ). Invalid dates are rejected with a dialog.
Edit dialog has manual Breitengrad / Längengrad fields for fixing coordinates by hand.
Tab 2: rows without coordinates shown in red, "Nur ohne Koordinaten" filter, count in the hint line, right-click Koordinaten suchen.

Housekeeping

git init + .gitignore.
Rotating log file at data/app.log (_setup_logging).
Shared helpers filter_locations / split_city_plz / parse_coord replace duplicated combobox code.
Config constants: GEOCODE_REGIONS, MAP_DEFAULT_CENTER, MAP_DEFAULT_ZOOM, MAX_BACKUPS.
generate_map fits the view to the markers.

Verification

Non-GUI smoke tests (helpers, DataStore backup/atomic/recovery, geocoder resilience) pass. The GUI could not be run on the development Mac — see dev-notes.md.

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