import { D1Store } from '@/core/store';
// Reconnectable SSE batches with Last-Event-ID replay. Closing each batch avoids
// tying a Worker invocation to an unbounded loop; EventSource reconnects in 3s.
export async function GET(request:Request){
 try{const s=await new D1Store().load();const raw=request.headers.get('last-event-id')??new URL(request.url).searchParams.get('after')??'0';const after=Math.max(0,Number(raw)||0);let data='retry: 3000\n\n';if(after&&s.events[0]?.seq>after+1)data+='event: gap\ndata: {"reload":true}\n\n';for(const e of s.events.filter(e=>e.seq>after))data+=`id: ${e.seq}\nevent: realm\ndata: ${JSON.stringify(e)}\n\n`;return new Response(data+': heartbeat\n\n',{headers:{'Content-Type':'text/event-stream','Cache-Control':'no-cache'}});}catch{return Response.json({error:'Event stream unavailable'},{status:503});}
}