dataset_id: jp-election-db.derived-extraction-data
family: "prefecture-series"
dataset: "party-votes"
source_release_version: "by-election-current-2026-06-17"
source_layer: "Layer 2 Release Facts"
primary_selector_field: "prefecture_code"
primary_selector_index_dir: "by-prefecture"
row_grain: "prefecture_code x election_key x party_id"
built_at: "2026-06-16T16:24:05Z"
notes: "Non-canonical prefecture party-vote 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/party-votes/latest/nationwide.csv
    sha256: 8ca13692ca429cf4b8cbdd9c77f6e0b69d7e695790e88b58db5c45a8dfe69b80
    size_bytes: 918026
    row_count: 10275
    notes: "Stable latest nationwide CSV."
summary:
  primary_selector_field: "prefecture_code"
  primary_selector_index_dir: "by-prefecture"
  selector_file_count: 47