feat(postcodes/DACH): bulk-import 35,596 codes via OpenPLZ (#1039)#1431
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Adds two things in one PR (the script + its first run):
1. bin/scripts/sync/import_openplz_postcodes.py — pipeline that walks
the OpenPLZ REST API hierarchy for Germany, Austria, and
Switzerland, paginating Localities under each region. ODbL-1.0
licensed source matches this repo's licence exactly.
2. Three new contribution files:
contributions/postcodes/DE.json (12,815 records, 2.5 MB)
contributions/postcodes/AT.json (18,722 records, 4.0 MB)
contributions/postcodes/CH.json ( 4,059 records, 840 KB)
Total: 35,596 postcodes across DACH with 100% state_id resolution.
How state resolution works
- DE/CH: exact case-insensitive name match against states.json (with
light umlaut normalisation and a few translation aliases:
Luzern->Lucerne, Genève->Geneva, Basel-Landschaft->Basel-Land,
Fribourg/Freiburg->Fribourg, etc.)
- AT: name match catches the directly-spelt provinces (Salzburg,
Vorarlberg, Burgenland) and aliases handle translations
(Wien->Vienna, Tirol->Tyrol, Steiermark->Styria, Kärnten->Carinthia,
Niederösterreich->Lower Austria, Oberösterreich->Upper Austria).
A postcode-prefix fallback covers the rest (1xxx=Wien, 8xxx=Steiermark,
9xxx=Kärnten, etc.) — Austrian Post's well-documented prefix scheme
is more reliable than fuzzy multilingual name matching.
LI deliberately omitted
- contributions/postcodes/LI.json is already curated (#1401) with 13
high-quality 1:1 commune-to-code rows. OpenPLZ's per-code endpoint
returns multiple sub-localities per code (e.g. Vaduz-Triesen,
Vaduz-Schaan) that would muddy the existing clean mapping.
Validation (zero errors across 35,596 records)
- All codes match countries.postal_code_regex for their ISO2
- All country_id/state_id foreign keys resolve
- All state_code values agree with state.iso2
- No auto-managed fields present (id, created_at, updated_at, flag)
- Idempotent re-runs preserve any future curated rows by (code, locality_name)
License & attribution
- Source: OpenPLZ (https://openplzapi.org), ODbL-1.0
- Each row: source: "openplz" for programmatic attribution
Refs: #1039
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Second bulk postcode PR after India (#1430). Adds:
bin/scripts/sync/import_openplz_postcodes.py— pipeline that walks the OpenPLZ REST API hierarchy for Germany, Austria, and Switzerland, paginatingLocalitiesunder each region. ODbL-1.0 licensed source — an exact match for this repo's licence.Three new contribution files:
contributions/postcodes/DE.json— 12,815 records, 2.5 MBcontributions/postcodes/AT.json— 18,722 records, 4.0 MBcontributions/postcodes/CH.json— 4,059 records, 840 KBTotal: 35,596 postcodes across DACH with 100%
state_idresolution.State resolution strategy
states.json, with umlaut normalisation. 100% (16/16 federal states match cleanly).LI deliberately omitted
contributions/postcodes/LI.jsonis already curated (#1401) with 13 high-quality 1:1 commune-to-code rows. OpenPLZ's per-code endpoint returns multiple sub-localities per code (e.g. Vaduz-Triesen, Vaduz-Schaan) that would muddy the existing clean mapping.Validation (zero errors across 35,596 records)
state_idresolvedpostal_code_regexstate_code↔state.iso2agreementLicense & attribution
source: "openplz"for programmatic attributionCumulative postcode coverage after this lands
Refs: #1039