{
  "id": 13218205,
  "title": "How to Budget Realtime Score Retention Across Cellular Handoffs: API Boundary Patterns",
  "url": "https://urgent.news/2026/10/09/how-to-budget-realtime-score-retention-across-cellular-handoffs-api",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-09T21:25:27.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/fitzgeraldblake3561/how-to-budget-realtime-score-retention-across-cellular-handoffs-api-boundary-patterns-j7p"
  },
  "original_language": "en",
  "account": "When a cellular connection is lost, sports scores must be retained so that reconnection is quick and cost-effective. A replayable log with a cursor enables the client to switch from live delivery to a bounded backfill. The API boundary should focus on event identity and retention, not on ensuring a single connection survives tower changes. For each event, keep a minimal envelope containing the game ID, sequence number, event type, server timestamp, and payload data. The retention window depends on the use case—90 seconds for a casual scoreboard, several minutes for betting or officiating. Store the retention number in the contract for operations to monitor.\n\nThe storage cost can be reduced by keeping compact events for 90 seconds instead of full score snapshots for every reconnection. However, this approach requires an indexed query by game ID and sequence to avoid scans due to clock skew or duplicate timestamps. Budget storage by events per game and replay bytes per reconnect, then load-test the busiest interval.\n\nMobile network handoffs and API boundaries should guarantee ordering within a game, durable event IDs, and a clear recovery response. They should not promise packet delivery or uninterrupted TCP/WebSocket sessions. Treat connections as disposable, as cellular changes can invalidate addresses, pause radio traffic, or shift devices between IPv4 and IPv6 paths.\n\nA workable contract involves a live stream and a backfill endpoint. The client sends its last applied cursor, and the server returns the missing events or notifies the cursor is outside the replay window with a fresh snapshot. Use stable route names, such as GET /score-feed/live for the stream and GET /score-feed/replay?game_id=...&after=... for recovery. The replay response must have an unambiguous boundary to avoid deduplication issues when the client receives the same sequence number twice after a reconnect.\n\nIn Python, the client uses a push transport for normal operation and performs a bounded replay request after a disconnect. The client does not poll for the latest score every few seconds. Implement idempotent replay to handle client crashes without applying duplicate events. Test various failure scenarios, such as radio disable/enable, airplane mode, captive portals, IPv6-only networks, and devices sleeping longer than the replay window.",
  "summary": "Short answer: make the feed a replayable log with an explicit cursor, and let the client switch from live delivery to bounded backfill whenever a mobile handoff breaks the stream. The API boundary should describe event identity and retention, not promise that one connection survives every tower change. Start with the retention bill A sports score feed has two very different costs: delivering…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}