Parsed from dump: 30 regions, 145 districts, 3994 wards, 1913 postcodes.

Added district 'Njombe' (new id 152) to region 'Njombe' — it was missing from the legacy district table but wards referenced it.
Added district 'Kibiti' (new id 153) to region 'Pwani' — it was missing from the legacy district table but wards referenced it.
Corrected district reference 'mtakuja' -> 'geita' on ward rows.
Corrected district reference 'mangeni' -> 'moshi' on ward rows.
Corrected district reference 'chunyak' -> 'chunya' on ward rows.
Corrected district reference 'mbinga mjini b' -> 'mbinga' on ward rows.
Corrected district reference 'kiliua' -> 'kaliua' on ward rows.
Corrected district reference 'llala' -> 'ilala' on ward rows.
Fixed 2 postcode rows whose code/ward columns were swapped.

Result: 30 regions (4 verification), 147 districts (0 duplicates merged, 2 added), 4058 wards (59 duplicates merged, 125 copies created for same-named districts across regions), 2023 wards carry a postcode, 186 ambiguous postcodes resolved by region prefix.

Wards whose district was not found (NOT imported — add them with bin/add.php if needed):
  - Msisi (id 137, district 'Mtitaa')
  - Arumeru (id 3988, district 'Ambureni')

Postcodes whose ward was not found (NOT imported — add the ward with bin/add.php if needed):
  - 'poli' -> 23304
  - 'seela seela sing'isi' -> 23305
  - 'sokon i' -> 23115
  - 'ngorongoro' -> 23719
  - 'mtitaa' -> 41318
  - 'chilonwa' -> 41401
  - 'idifun' -> 41415
  - 'zajilwa' -> 41430
  - 'bugulula' -> 30132
  - 'mtakuja' -> 30106
  - 'kamsisi' -> 50325
  - 'basanza' -> 47610
  - 'mabogini' -> 25201
  - 'mengeni' -> 25707
  - 'mchinga' -> 65131
  - 'mkotokuyana' -> 65308
  - 'mnero miembeni' -> 65313
  - 'naipanga' -> 65309
  - 'luchelegwa' -> 65615
  - 'gallapo' -> 27212
  - 'mogitu' -> 27303
  - 'lengatei' -> 27515
  - 'ndirgishi' -> 27520
  - 'ayamohe' -> 27401
  - 'marang' -> 27415
  - 'loiborsiret' -> 27615
  - 'neruma' -> 31518
  - 'bukabwa' -> 31205
  - 'buswahili' -> 31225
  - 'bukumi' -> 31123
  - 'nyakatende' -> 31137
  - 'nyathorogo' -> 31316
  - 'machochwe' -> 31611
  - 'ganyange' -> 31430
  - 'madibira' -> 53610
  - '53133' -> 53220
  - 'utengule /usongwe' -> 53208
  - 'kawetele' -> 53505

Postcodes attached to every same-named ward because no region prefix matched:
  - 'majengo' code 25104 (no region prefix match — attached to all 19 candidates)