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stats_links.py: pure functions returning a filter per stats category (sessions for game/platform/month, games played, total/refunded/dropped/ unfinished/finished/finished-released/bought-and-finished/backlog purchases). Each is verified to produce a queryset whose count equals the stat it links from, on single-game data (the modeling norm). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RF5L4HtbcykTfY9YUYGds3