Proxy chains any inbound XFF with the connection IP before relaying upstream; UseForwardedHeaders resolves it to the limiter's partition key. Documents the EventRepository first-play counter race (unique index is the backstop).
Player-service play-session tracker (floor + 3-bucket classify), SharePopover share tracker with debounce, sendBeacon interop, proxied rate-limited POST api/event/{play,share}, append-only event logs + incremental play_counter with server-side release resolution. Migration authored, not applied. No anonId, no read surface.