# 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 |