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Reporter IndividualGhost1905 upgraded to 0.2.4.1 (which shipped the per-event aggregation rewrite from #1378) and saw Quick Stats split between consistent values (Total Prints, Print Time, Filament Used, Energy, Success Rate matched the archive list) and zero-or-empty ones (Filament Cost, Time Accuracy). Root cause: #1378's migration added six columns to print_log_entries - archive_id, cost, energy_kwh, energy_cost, failure_reason, created_by_id - but never backfilled them. Pre-upgrade rows kept NULL on all six. The new Quick Stats query sums PrintLogEntry.cost (gets 0 on legacy data); the time-accuracy query JOINs PrintArchive ON archive_id (drops every legacy run from the average). Counts and the pre-existing per-row fields (status, duration_seconds, filament_used_grams) kept working - which is why some panels looked right and others didn't. Two-step backfill added inside run_migrations next to the existing column-add block, as DML inside begin_nested() (not _safe_execute, which is documented DDL-only): Step 1: link each orphan log entry to its archive via print_name + printer_id (highest archive id wins on tiebreak - newest matches the overwrite-then-stop shape pre-#1378 reprints left behind). Step 2: copy archive.cost / energy_kwh / energy_cost onto the latest matching log entry per archive, BUT only for archives where no log entry yet carries a cost. That second clause is the idempotency anchor and the double-count guard for users running this after #1378 has already written cost-bearing rows for new runs - those archives are left untouched. Earlier reprints stay NULL, matching the "first/latest writes, rest stay NULL" convention #1378 introduced for new prints. Sum across the legacy reprint chain reproduces sum-of-archive-cost exactly, so Quick Stats Filament Cost matches the pre-upgrade total instead of dropping to zero. SQL is plain ANSI - correlated UPDATE with LIMIT 1 in the SET subquery, WHERE id IN (SELECT MAX(id) ... GROUP BY archive_id HAVING SUM(CASE WHEN cost IS NOT NULL THEN 1 ELSE 0 END) = 0). Verified end-to-end on SQLite (4 new unit tests in test_print_log_backfill_migration.py: link-via-name, latest-run-gets- cost, idempotent, skip-archives-with-any-costed-run) and against a live postgres:16-alpine + asyncpg container (first-pass and second- pass produce identical state). The other widgets the reporter listed (Printer Stats, Filament Trends, By Material, Success by Material, Color Distribution) iterate the archives list on the frontend rather than calling /stats - they read consistent pre-upgrade data and aren't part of this fix; the inconsistency between them and Quick Stats resolves once the backfill brings Quick Stats in line.