dataset_id: jp-election-db.derived-extraction-data
family: "prefecture-series"
dataset: "stats"
source_release_version: "2026-05-04-v051"
source_layer: "Layer 2 Release Facts"
primary_selector_field: "prefecture_code"
primary_selector_index_dir: "by-prefecture"
row_grain: "prefecture_code x election_key"
built_at: "2026-05-03T19:00:39Z"
notes: "Non-canonical prefecture statistics series built deterministically from Layer 2 by-election facts."
source_election_set_keys:
  - "20090830_hr"
  - "20100711_hc"
  - "20121216_hr"
  - "20130721_hc"
  - "20141214_hr"
  - "20160710_hc"
  - "20171022_hr"
  - "20190721_hc"
  - "20211031_hr"
  - "20220710_hc"
  - "20241027_hr"
  - "20250720_hc"
  - "20260208_hr"
files:
  - artifact_id: latest_nationwide
    path: products/jp-election/derived/extraction/prefecture-series/stats/latest/nationwide.csv
    sha256: 73f444e04101b7963a2a27008930b55ba3e34a01d646c29606f34db349a4c277
    size_bytes: 104385
    row_count: 1222
    notes: "Stable latest nationwide CSV."
summary:
  primary_selector_field: "prefecture_code"
  primary_selector_index_dir: "by-prefecture"
  selector_file_count: 47