Data notes · definitions, export gaps, restored days
“Active” = real sessions (session_start / engagement) — push-inflated activity is excluded by
construction. Gaps in lines are missing BigQuery export days (Jul 25–28 unrecoverable), not zeros. Since 2026-09-18 a reader is a user with read, continue_read or select_chapter that day, and fic opens include chapter selects; days restored from older snapshots show gaps for those reading metrics rather than the old, lower values. Chapter-break and
search metrics exist from Aug 9 (iOS) and reach Android as 1.6.55 rolls out. The newest cohort day's D1 is
provisional until the following day completes.