Preserve fleet match timing across empty telemetry

docs/guides/beta-test-plans.md

@@ -190,6 +190,12 @@ an end closes the match. Receipt order determines the latest report. This small
 protocol does not attempt to identify delayed events from earlier games or
 provide exactly-once delivery across games.
 
+Match timing is independent of player count: an empty `game_start` still records
+the start, and empty rosters or RCON polls do not erase it. Fleet can display a
+fresh reported round even when the start was missed; match duration stays unknown
+in that case. When match history identifies a new match from subsequent gameplay,
+Fleet clears the previous match's timing rather than carrying it into the new one.
+
 Reports also feed the persistent [Leaderboard](leaderboard.md), independently
 of beta activity. That page documents cumulative stat accounting, round credit,
 and the limits of identifying matches from this protocol.

src/lib/fleet-overview.ts

@@ -105,14 +105,13 @@ export function currentRound(
         (report.event !== 'round_change' && report.event !== 'heartbeat') ||
         !freshServer(server, now) ||
         !server.active_since ||
-        !server.game_started_at ||
         server.game_ended_at ||
         (server.last_players ?? 0) === 0
     )
         return null;
     const received = Date.parse(report.receivedAt);
     return freshTelemetry(report, now, server.telemetry_after) &&
-        received >= Date.parse(server.game_started_at) &&
+        (!server.game_started_at || received >= Date.parse(server.game_started_at)) &&
         received >= Date.parse(server.active_since)
         ? report.round
         : null;

src/lib/server-observation.ts

@@ -176,8 +176,8 @@ export function selectServerObservation<T extends ServerObservation>(
             })),
             active_since: players > 0 ? timing.activeSince : null,
             inactive_since: players === 0 ? timing.inactiveSince : null,
-            game_started_at: players === 0 ? null : timing.gameStartedAt,
-            game_ended_at: players === 0 ? null : timing.gameEndedAt
+            game_started_at: timing.gameStartedAt,
+            game_ended_at: timing.gameEndedAt
         };
     }
     // A current authenticated RCON reply can establish game liveness when

src/lib/server/fleet/status-updates.ts

@@ -20,15 +20,13 @@ export function successfulStatusFields(
     };
 }
 
-/** Occupancy timers and match clearing follow the same source as the UI. */
+/** Occupancy follows the UI's source; only gameplay evidence changes match timing. */
 export function activityFields(current: ServerRow, status: ServerObservation): Partial<ServerRow> {
     if (status.health !== 'online' || status.last_players === null) return {};
     return status.last_players > 0
         ? { active_since: current.active_since ?? status.last_seen_at, inactive_since: null }
         : {
               active_since: null,
-              inactive_since: current.inactive_since ?? status.last_seen_at,
-              game_started_at: null,
-              game_ended_at: null
+              inactive_since: current.inactive_since ?? status.last_seen_at
           };
 }

src/lib/server/fleet/telemetry.ts

@@ -25,46 +25,55 @@ export function saveTelemetry(report: GameTelemetry): GameTelemetry {
             ? JSON.parse(row.payload)
             : undefined;
         recordLeaderboardTelemetry(handle, report);
-        // Record each occupancy transition at receipt, before a heartbeat can
-        // replace game_start or an empty report between status polls.
-        const after = latestGameSubmission(report.server);
-        if (!after || Date.parse(report.receivedAt) > Date.parse(after)) {
-            if (report.players.length > 0) {
-                handle
+        const match = handle
             .prepare(
-                        'UPDATE servers SET active_since = COALESCE(active_since, ?), inactive_since = NULL WHERE name = ?'
+                'SELECT id, started_at, start_observed FROM leaderboard_matches WHERE server = ? ORDER BY id DESC LIMIT 1'
             )
-                    .run(report.receivedAt, report.server);
-                if (report.event === 'game_start') {
-                    handle
-                        .prepare(
-                            'UPDATE servers SET game_started_at = ?, game_ended_at = NULL WHERE name = ?'
-                        )
-                        .run(report.receivedAt, report.server);
-                } else if (report.event === 'game_end') {
-                    handle
-                        .prepare('UPDATE servers SET game_ended_at = ? WHERE name = ?')
-                        .run(report.receivedAt, report.server);
-                }
-            } else {
-                handle
-                    .prepare(
-                        `UPDATE servers SET active_since = NULL, inactive_since = COALESCE(inactive_since, ?),
-                    game_started_at = NULL, game_ended_at = NULL WHERE name = ?`
-                    )
-                    .run(report.receivedAt, report.server);
-            }
-        }
+            .get(report.server) as { id: number; started_at: string; start_observed: number };
+        const sameMatch = previous?.timing?.matchId === match.id;
         const serverTiming = handle
             .prepare(
                 `SELECT active_since AS activeSince, inactive_since AS inactiveSince,
             game_started_at AS gameStartedAt, game_ended_at AS gameEndedAt FROM servers WHERE name = ?`
             )
             .get(report.server) as ServerTiming;
-        const match = handle
-            .prepare('SELECT id FROM leaderboard_matches WHERE server = ? ORDER BY id DESC LIMIT 1')
-            .get(report.server) as { id: number };
-        const sameMatch = previous?.timing?.matchId === match.id;
+        // Record each occupancy transition at receipt, before a heartbeat can
+        // replace game_start or an empty report between status polls.
+        const after = latestGameSubmission(report.server);
+        if (!after || Date.parse(report.receivedAt) > Date.parse(after)) {
+            const occupied = report.players.length > 0;
+            serverTiming.activeSince = occupied
+                ? (serverTiming.activeSince ?? report.receivedAt)
+                : null;
+            serverTiming.inactiveSince = occupied
+                ? null
+                : (serverTiming.inactiveSince ?? report.receivedAt);
+            // Match boundaries follow history, independently of roster occupancy.
+            // Recover starts discarded by older receivers only when a start was
+            // actually observed; an inferred match has no known start time.
+            const startedAt =
+                report.event === 'game_start'
+                    ? report.receivedAt
+                    : ((sameMatch ? serverTiming.gameStartedAt : null) ??
+                      (match.start_observed ? match.started_at : null));
+            serverTiming.gameStartedAt =
+                startedAt && (!after || Date.parse(startedAt) > Date.parse(after))
+                    ? startedAt
+                    : null;
+            serverTiming.gameEndedAt = report.event === 'game_end' ? report.receivedAt : null;
+            handle
+                .prepare(
+                    `UPDATE servers SET active_since = ?, inactive_since = ?,
+                game_started_at = ?, game_ended_at = ? WHERE name = ?`
+                )
+                .run(
+                    serverTiming.activeSince,
+                    serverTiming.inactiveSince,
+                    serverTiming.gameStartedAt,
+                    serverTiming.gameEndedAt,
+                    report.server
+                );
+        }
         // A gap beyond the normal heartbeat window cannot establish continuity.
         const continuous =
             previous && Date.parse(report.receivedAt) - Date.parse(previous.receivedAt) <= 120_000;

src/lib/ui/components/ServerCard.svelte

@@ -100,10 +100,10 @@
             : null
     );
     const currentRound = $derived(
-        !gameEndedAt ? (round !== undefined ? round : reportedRound) : null
+        players !== 0 && !gameEndedAt ? (round !== undefined ? round : reportedRound) : null
     );
     const gameElapsed = $derived(
-        gameStartedAt && !gameEndedAt ? elapsedSince(gameStartedAt, $uiNow) : null
+        players !== 0 && gameStartedAt && !gameEndedAt ? elapsedSince(gameStartedAt, $uiNow) : null
     );
     const emptyElapsed = $derived(elapsedSince(inactiveSince, $uiNow));
     // These lobbies have four slots when the live status omits the limit.

tests/unit/fleet-overview.test.ts

@@ -119,6 +119,14 @@ describe('Fleet discovery and match freshness', () => {
         (event) => {
             const report = { ...gameEvent(event, 38, 4, server.name), receivedAt: iso(-1000) };
             expect(currentRound(server, report, now)).toBe(38);
+            const unknownStart = { ...server, game_started_at: null };
+            expect(currentRound(unknownStart, report, now)).toBe(38);
+            expect(
+                currentRound({ ...unknownStart, telemetry_after: iso() }, report, now)
+            ).toBeNull();
+            expect(
+                currentRound(unknownStart, { ...report, receivedAt: iso(-121_000) }, now)
+            ).toBeNull();
             for (const change of [
                 { receivedAt: iso(-121_000) },
                 { receivedAt: iso(-61_000) },

tests/unit/server-observation.test.ts

@@ -434,7 +434,7 @@ describe('shared server observation', () => {
         expect(freshTelemetry({ ...report(), players: [{}] } as never, now)).toBe(false);
     });
 
-    it('uses game-start rosters without inventing scores and clears match times on an empty report', () => {
+    it('uses game-start rosters without inventing scores and preserves match times on an empty report', () => {
         const start = { ...gameEvent('game_start', 0, 2, 'managed'), receivedAt: at() };
         const active = selectServerObservation(server(), start, now);
         expect(active.roster?.[0]).toMatchObject({ score: null, ping: null });
@@ -444,8 +444,8 @@ describe('shared server observation', () => {
         ).toMatchObject({
             last_players: 0,
             roster: [],
-            game_started_at: null,
-            game_ended_at: null
+            game_started_at: at(),
+            game_ended_at: at()
         });
     });
 });

tests/unit/server-status.test.ts

@@ -608,7 +608,7 @@ describe('database fleet and container readiness', () => {
         }
     );
 
-    it('keeps game_end through occupied polls until game_start or an empty lobby', async () => {
+    it('keeps game_end through RCON polls and recovers when telemetry observes a new match', async () => {
         const { inspect, rcon, fanoutStatus, getServer } = await setup();
         inspect.mockResolvedValue({ ok: true, state: 'running' });
         const reply = (players: number) => ({
@@ -621,9 +621,11 @@ describe('database fleet and container readiness', () => {
         await postTelemetry(gameEvent('game_end', 10, 1, 'managed'));
         const ended = getServer('managed')?.game_ended_at;
         expect(ended).toEqual(expect.any(String));
-        await postTelemetry(gameEvent('heartbeat', 10, 1, 'managed'));
         await fanoutStatus();
         expect(getServer('managed')?.game_ended_at).toBe(ended);
+        await postTelemetry(gameEvent('heartbeat', 1, 1, 'managed'));
+        await fanoutStatus();
+        expect(getServer('managed')).toMatchObject({ game_started_at: null, game_ended_at: null });
         await postTelemetry(gameEvent('game_start', 0, 1, 'managed'));
         expect(getServer('managed')?.game_ended_at).toBeNull();
         await postTelemetry(gameEvent('game_end', 10, 1, 'managed'));
@@ -638,6 +640,54 @@ describe('database fleet and container readiness', () => {
         expect(getServer('managed')?.game_ended_at).toBeNull();
     });
 
+    it.each([0, 1])(
+        'preserves a match starting with %i players through empty reports, polls, a gap, and reload',
+        async (startPlayers) => {
+            const { inspect, rcon, fanoutStatus, getServer } = await setup();
+            const { GET } = await import('../../src/routes/api/servers/+server.js');
+            const { currentRound } = await import('../../src/lib/fleet-overview.js');
+            const { closeDb } = await import('../../src/lib/server/db/index.js');
+            const beginning = Date.parse('2026-10-09T12:00:00Z');
+            const at = (seconds: number) => new Date(beginning + seconds * 1000).toISOString();
+            vi.useFakeTimers({ toFake: ['Date'] });
+            vi.setSystemTime(beginning);
+            inspect.mockResolvedValue({ ok: true, state: 'running' });
+            rcon.mockResolvedValue({
+                ok: true,
+                endpoint: { host: 'localhost', port: 28960 },
+                status: { players: 0, map: 'zombie_theater', gametype: 'zom', roster: [] }
+            });
+            const start = await (
+                await postTelemetry(gameEvent('game_start', 0, startPlayers, 'managed'))
+            ).json();
+            expect(start.telemetry.timing.server.gameStartedAt).toBe(at(0));
+            vi.setSystemTime(beginning + 1000);
+            await postTelemetry(gameEvent('round_change', 1, 0, 'managed'));
+            for (const seconds of [30, 121]) {
+                vi.setSystemTime(beginning + seconds * 1000);
+                await fanoutStatus();
+                expect(getServer('managed')).toMatchObject({
+                    active_since: null,
+                    game_started_at: at(0),
+                    game_ended_at: null
+                });
+            }
+            vi.setSystemTime(beginning + 180_000);
+            await postTelemetry(gameEvent('heartbeat', 4, 1, 'managed'));
+            await fanoutStatus();
+            closeDb();
+            const server = (await (await GET()).json()).servers[0];
+            expect(server).toMatchObject({
+                health: 'online',
+                last_players: 1,
+                active_since: at(180),
+                game_started_at: at(0),
+                game_ended_at: null
+            });
+            expect(currentRound(server, server.telemetry, Date.now())).toBe(4);
+        }
+    );
+
     it('keeps the first occupied report as the active timer when more telemetry arrives before polling', async () => {
         const { inspect, rcon, fanoutStatus, getServer } = await setup();
         const { GET } = await import('../../src/routes/api/servers/+server.js');

tests/unit/telemetry.test.ts

@@ -18,6 +18,45 @@ afterEach(async () => fixture.cleanup());
 
 const payload = gameEvent('round_change', 17);
 
+it.each(['game_end', 'round reset', 'map change'])(
+    'drops the previous match timing when game_start is missed after %s',
+    async (boundary) => {
+        const { saveTelemetry } = await import('../../src/lib/server/fleet/telemetry.js');
+        const { getServer } = await import('../../src/lib/server/fleet/servers.js');
+        const at = (seconds: number) =>
+            new Date(Date.parse('2026-10-09T12:00:00Z') + seconds * 1000).toISOString();
+        saveTelemetry({ ...gameEvent('game_start', 0, 1), receivedAt: at(0) });
+        const previous = saveTelemetry({ ...gameEvent('heartbeat', 7, 1), receivedAt: at(30) });
+        if (boundary === 'game_end') {
+            const ended = saveTelemetry({ ...gameEvent('game_end', 7, 0), receivedAt: at(31) });
+            expect(ended.timing?.server?.gameEndedAt).toBe(at(31));
+        }
+        const next = saveTelemetry({
+            ...gameEvent('heartbeat', boundary === 'map change' ? 8 : 1, 1),
+            ...(boundary === 'map change' ? { map: 'zombie_moon' } : {}),
+            receivedAt: at(60)
+        });
+        expect(next.timing?.matchId).not.toBe(previous.timing?.matchId);
+        expect(next.timing?.server).toMatchObject({ gameStartedAt: null, gameEndedAt: null });
+        expect(getServer(payload.server)).toMatchObject({
+            game_started_at: null,
+            game_ended_at: null
+        });
+    }
+);
+
+it('repairs a previously discarded start from an observed match without inventing one', async () => {
+    const { saveTelemetry } = await import('../../src/lib/server/fleet/telemetry.js');
+    const { db } = await import('../../src/lib/server/db/index.js');
+    const at = (seconds: number) =>
+        new Date(Date.parse('2026-10-09T12:00:00Z') + seconds * 1000).toISOString();
+    saveTelemetry({ ...gameEvent('game_start', 0, 0), receivedAt: at(0) });
+    // Simulate the old ingestion behavior for an empty start.
+    db().prepare('UPDATE servers SET game_started_at = NULL WHERE name = ?').run(payload.server);
+    const report = saveTelemetry({ ...gameEvent('heartbeat', 4, 1), receivedAt: at(120) });
+    expect(report.timing?.server?.gameStartedAt).toBe(at(0));
+});
+
 it('does not let a request received before a lifecycle submission restore cleared timers', async () => {
     const { db } = await import('../../src/lib/server/db/index.js');
     const { saveTelemetry } = await import('../../src/lib/server/fleet/telemetry.js');

tests/unit/ui-server-card.test.ts

@@ -88,6 +88,15 @@ describe('compact server cards', () => {
         expect(body).not.toContain('36ms');
     });
 
+    it('shows a known round without a match clock and hides match metrics for an empty lobby', () => {
+        const occupied = html({ gameStartedAt: null, round: 31 });
+        expect(occupied).toMatch(/<dt[^>]*>Round<\/dt>\s*<dd[^>]*>31<\/dd>/);
+        expect(occupied).toMatch(/<dt[^>]*>Match time<\/dt>\s*<dd[^>]*>—<\/dd>/);
+        const empty = html({ players: 0, round: 31, compactEmpty: false });
+        expect(empty).toMatch(/<dt[^>]*>Round<\/dt>\s*<dd[^>]*>—<\/dd>/);
+        expect(empty).toMatch(/<dt[^>]*>Match time<\/dt>\s*<dd[^>]*>—<\/dd>/);
+    });
+
     it('places Pin outside the only link and retains its pressed state and server name', () => {
         const body = html({ pinned: true, onPin: () => {} });
         expect(body).toMatch(/<article\b/);

tests/unit/ui-server-clock.test.ts

@@ -460,26 +460,26 @@ describe('Fleet report clock', () => {
             report('heartbeat', 34, 0, {
                 activeSince: null,
                 inactiveSince: at(34),
-                gameStartedAt: null,
+                gameStartedAt: at(32),
                 gameEndedAt: null
             })
         ).toMatchObject({
             active_since: null,
             inactive_since: at(34),
-            game_started_at: null,
+            game_started_at: at(32),
             game_ended_at: null
         });
         expect(
             report('heartbeat', 35, 1, {
                 activeSince: at(35),
                 inactiveSince: null,
-                gameStartedAt: null,
+                gameStartedAt: at(32),
                 gameEndedAt: null
             })
         ).toMatchObject({
             active_since: at(35),
             inactive_since: null,
-            game_started_at: null,
+            game_started_at: at(32),
             game_ended_at: null
         });
     });