data-dictionary.md

Data dictionary

Version 1.1.0. data-dictionary.json holds the same descriptions in machine-readable form.

id and user_id are local keys of this dataset. github_id and repository_id are GitHub's numeric IDs. crosswalk.sql defines a view that adds owner logins, repository names and URLs to every repository row.

Biographies, company, location, external links and the counts of followed accounts, organizations and sponsors were in the source database and are not released.

All columns are nullable in the Parquet schema. NULL values occur only in followers_count, concentration, effective_breadth and exclusion_reason.

users

One row per account. 3,671,497 rows.

Field	Type	Meaning
id	integer	Local key of the account in this dataset. Not the GitHub ID
github_id	integer	GitHub's numeric ID of the account
github_name	string	Login stored at collection time. The account may have been renamed since
created_at	string	Time the collector inserted the account (8 or 9 December 2025). Not the GitHub registration date
last_updated	string	Time of the collector's last update of the account, or the placeholder 6200-01-01. Not the time the repositories were fetched
h_index	integer	h-index stored by the collector. portfolios.h_observed recomputes it from the repository rows
repositories_fetched	integer	Raw collector flag: 1 after a repository fetch ended, -1 while one was in progress
followers_count	integer	Follower count. NULL when profile_available is false
followers_count_raw	integer	Follower count as stored. When profile_available is false it is a default value, not an observed count
retrieval_status	string	Repository retrieval class derived from the collector's flags: complete, failed or unknown. Not checked against GitHub
profile_available	boolean	False when the stored biography is NULL or all stored profile fields are defaults. The follower count is then treated as missing
bio_was_null	boolean	True when the stored biography was NULL. The biography text is not released
profile_default_signature	boolean	True when the stored profile fields all had their default values
retrieval_inference_basis	string	How retrieval_status was derived. Always collector_code_inference
retrieval_evidence_ref	string	Location in the collector source that supports the class
rowset_completeness_independently_certified	boolean	Always false. No account's repository list was checked against GitHub

repositories

One row per repository under one account. 53,990,808 rows.

Field	Type	Meaning
id	integer	Local key of the row
user_id	integer	Local key of the owner. Joins users.id
repository_id	integer	GitHub's numeric ID of the repository. Twenty IDs appear under more than one account
name	string	Repository name as stored
created_at	string	Creation time of the repository on GitHub. Not the time it was fetched
stars	integer	Star count when the repository was fetched

portfolios

One row per account, computed from its repository rows. 3,671,497 rows.

Field	Type	Meaning
user_id	integer	Local key of the account. Joins users.id
github_id	integer	GitHub's numeric ID of the account
n_repositories	integer	Number of stored repository rows of the account, including repositories with no stars
total_stars	integer	Sum of stars over those rows
max_stars	integer	Largest star count among those rows. 0 for an account with no rows
sum_squared_stars	integer	Sum of squared star counts over those rows
h_observed	integer	h-index recomputed from the repository rows
h_stored	integer	h-index stored by the collector (users.h_index)
starred_repositories	integer	Number of rows with at least one star
concentration	float	Sum of squared star shares (Herfindahl index). NULL when total_stars is 0
effective_breadth	float	1 / concentration. NULL when total_stars is 0
retrieval_status	string	Same as users.retrieval_status
profile_available	boolean	Same as users.profile_available
valid_portfolio	boolean	True when the account's rows passed the structural checks. It says nothing about completeness
eligible	boolean	True when retrieval_status is complete. The reuse examples use these accounts
exclusion_reason	string	Why the account is left out of the reuse examples. NULL for accounts that are used. All rows stay in the release