feat(postcodes/FI): 3,748 Posti.fi PCF codes (#1039)#1513
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Adds Finland's official 5-digit postal codes from Posti.fi's daily PCF (postal code file) export. Why --- Closes the FI gap on issue #1039. The previously-tracked launis/areadata source was a wrapper-only package with no bulk export. Posti's PCF DAT file is the canonical source but the URL is date-stamped (memory: known difficult). Auto-resolution of the URL via 30-day-back HEAD probe makes this a clean static fetch. Coverage -------- - 3,748 codes / 100% state FK - All 18 mainland Finnish maakunta covered - 37 Åland records skipped — they ship to AX (Åland Islands, separate CSC country) via a companion importer Source pipeline --------------- 1. URL probe back ~30 days for the latest PCF_<YYYYMMDD>.dat 2. ISO-8859-1 decode (Posti standard) 3. Fixed-width parse (220 chars/record per Posti spec) 4. Region name -> CSC iso2 via FI_REGION_TO_ISO2 (18-entry hand map — Finnish maakunta names; Helsinki-Uusimaa NUTS sub-region merges into Uusimaa per ISO 3166-2:FI) License ------- Source: Posti.fi PCF (free redistribution permitted with attribution). Each row: source: "posti-fi-pcf" Tier 5 per #1039 license-tier policy. Validation ---------- - python3 -m py_compile passes - 100% regex match (^(?:FI)*\d{5}$) - 100% state_id valid + state.country_id == 74 + state_code agrees - No auto-managed fields (id, created_at, updated_at, flag) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Posti's PCF_*.dat file is canonical but URL is date-stamped — known difficult per memorySource
https://www.posti.fi/webpcode/unzip/PCF_<YYYYMMDD>.datFormat
Fixed-width ISO-8859-1, 220 chars/record. Importer parses positional fields per Posti's published spec (record id, postal code, postal name FI/SV, abbreviations, effective date, region code, region names FI/SV, municipality code, municipality names FI/SV, language).
State FK strategy
18-entry
FI_REGION_TO_ISO2maps Finnish maakunta names to CSC iso2:Helsinki-Uusimaa(NUTS sub-region) → CSC18Uusimaa per ISO 3166-2:FIÅland is shipped separately
The 37 source records with region
FI200 / Ahvenanmaabelong to Åland Islands, which is a separate CSC country (AX, country_id=2). They will be shipped via a companion AX importer.Distribution (top 5)
All 18 mainland regions covered.
Test plan
python3 -m py_compile bin/scripts/sync/import_finland_postcodes.py^(?:FI)*\d{5}$id,created_at,updated_at,flag)🤖 Generated with Claude Code