{
  "api_version": "1.0.0",
  "schema_version": "1.0.0",
  "count": 9,
  "timeline_scope": "Repository verification history and dated external events supported by the canonical guides. Unknown first-observation dates are not inferred.",
  "timelines": [
    {
      "achievement_slug": "pull-shark",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "The earliest public appearance and initial rollout date are not established by the current evidence set."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "guide-verification",
          "evidence_level": "confirmed",
          "summary": "Canonical trigger wording and community-reported tier thresholds were reviewed."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "confirmed",
          "summary": "Evidence record EVD-2026-001 was accepted with documented tier limitations."
        }
      ]
    },
    {
      "achievement_slug": "quickdraw",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "The exact qualifying time window and earliest award date remain undocumented by GitHub."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "guide-verification",
          "evidence_level": "community-reported",
          "summary": "The guide retained a provisional short-window description rather than asserting a fixed threshold."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "community-reported",
          "summary": "Evidence record EVD-2026-002 was marked provisional and awaiting independent reproduction."
        }
      ]
    },
    {
      "achievement_slug": "yolo",
      "last_reviewed": "2026-07-20",
      "history_limitations": [
        "Submitted COMMENT, REQUEST_CHANGES, APPROVE, dismissed, automated, and differing-merger review states remain unresolved."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "guide-verification",
          "evidence_level": "official",
          "summary": "GitHub's live achievement fragment established the broad 'Merged without a review' trigger."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "official",
          "summary": "Evidence record EVD-2026-003 was reconciled against GitHub's first-party product fragment."
        },
        {
          "date": "2026-07-20",
          "type": "review-request-boundary",
          "evidence_level": "observed",
          "summary": "A GitHub-linked qualifying pull request had a requested reviewer but zero submitted reviews, separating review requests from submitted review objects."
        }
      ]
    },
    {
      "achievement_slug": "pair-extraordinaire",
      "last_reviewed": "2026-07-20",
      "history_limitations": [
        "Exact numerical tier boundaries, rebase or fast-forward behavior, stripped trailers, email mismatch, later history rewrites, and private-repository behavior remain unresolved."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "official-source-review",
          "evidence_level": "official",
          "summary": "GitHub's multiple-author commit syntax and live Pair Extraordinaire trigger fragment were linked as attribution evidence."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "official",
          "summary": "Evidence record EVD-2026-004 retained numerical tier limitations while the broad trigger advanced to official."
        },
        {
          "date": "2026-07-20",
          "type": "squash-attribution-boundary",
          "evidence_level": "observed",
          "summary": "Two independent GitHub-linked squash merges retained account-linked Co-authored-by trailers in their final commits."
        }
      ]
    },
    {
      "achievement_slug": "galaxy-brain",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "The initial rollout date and full tier thresholds are not officially documented."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "guide-verification",
          "evidence_level": "observed",
          "summary": "Accepted answers were retained as distinct from other Discussion moderation states."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "observed",
          "summary": "Evidence record EVD-2026-005 was accepted with limitations and incomplete reproduction."
        }
      ]
    },
    {
      "achievement_slug": "starstruck",
      "last_reviewed": "2026-07-20",
      "history_limitations": [
        "Transfer timing, forks, archival, falling star counts, deletion, restoration, and award or tier revocation remain unresolved."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "official-fragment-review",
          "evidence_level": "official",
          "summary": "GitHub's live x4 fragment established the 16, 128, 512, and 4096 star milestones."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "official",
          "summary": "Evidence record EVD-2026-006 was reconciled against GitHub's first-party trigger and milestone history."
        },
        {
          "date": "2026-07-20",
          "type": "organization-ownership-boundary",
          "evidence_level": "observed",
          "summary": "Two GitHub-owned fragments retained personal creator attribution for repositories currently owned by organizations."
        }
      ]
    },
    {
      "achievement_slug": "public-sponsor",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "GitHub documents Sponsors but does not publish a complete achievement-award contract or rollout date."
      ],
      "events": [
        {
          "date": "2026-07-19",
          "type": "official-source-review",
          "evidence_level": "official",
          "summary": "GitHub Sponsors documentation was retained as product context rather than proof of the achievement trigger."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "community-reported",
          "summary": "Evidence record EVD-2026-007 was accepted with privacy and eligibility limitations."
        }
      ]
    },
    {
      "achievement_slug": "arctic-code-vault-contributor",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "The complete archived qualification list and account-level award chronology are not reproduced in this repository."
      ],
      "events": [
        {
          "date": "2020-01-01",
          "date_precision": "year",
          "type": "historical-qualification",
          "evidence_level": "confirmed",
          "summary": "The qualifying GitHub Arctic Code Vault archival event occurred during 2020; no more precise date is asserted here."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "confirmed",
          "summary": "Evidence record EVD-2026-008 was accepted as a historical, non-repeatable qualification."
        }
      ]
    },
    {
      "achievement_slug": "mars-2020-contributor",
      "last_reviewed": "2026-07-19",
      "history_limitations": [
        "The complete internal repository qualification list and account-level award chronology are not available as a current public contract."
      ],
      "events": [
        {
          "date": "2020-01-01",
          "date_precision": "year",
          "type": "historical-qualification",
          "evidence_level": "confirmed",
          "summary": "The mission-linked qualification is associated with Mars 2020; no more precise achievement-award date is asserted here."
        },
        {
          "date": "2026-07-19",
          "type": "evidence-baseline",
          "evidence_level": "confirmed",
          "summary": "Evidence record EVD-2026-009 was accepted as a historical, non-repeatable qualification."
        }
      ]
    }
  ]
}