Address code-review findings on draft schedule Gantt

- Use make_interval(months => $n) instead of parameterized interval
  multiplication so Postgres can infer the bound param's type (the prior
  form risked a "could not determine data type of parameter" runtime error)
- Fix subject/verb grammar in the coverage-gap warning for a single sport
  ("1 sport has" vs "N sports have")
- Stack overlapping draft windows for the same sport into separate lanes
  via greedy interval scheduling so bars no longer render on top of one
  another; row height grows with the number of concurrent windows
- Add a test covering overlapping windows rendering as separate bars

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fd51U9DPMNz4KzBeucR6CK

app/components/admin/DraftScheduleGantt.tsx

@@ -46,6 +46,40 @@ const STATUS_LABELS: Record<DraftScheduleWindow["status"], string> = {
 
 const clampPct = (n: number) => Math.max(0, Math.min(100, n));
 
+// Row layout (px). A single-lane row is LANE_HEIGHT + ROW_V_PAD tall; extra
+// concurrent windows add one lane each so overlapping bars never stack on top
+// of one another.
+const LANE_HEIGHT = 30;
+const LANE_GAP = 8;
+const ROW_V_PAD = 14;
+
+const rowHeight = (laneCount: number) => Math.max(laneCount, 1) * LANE_HEIGHT + ROW_V_PAD;
+
+/**
+ * Greedy interval-scheduling: assign each window to the first lane whose last
+ * bar ends before this one starts, otherwise open a new lane. Windows arrive
+ * sorted by draftOn (see findDraftScheduleForHorizon).
+ */
+function assignLanes(
+  windows: DraftScheduleWindow[],
+  start: Date
+): { placed: Array<{ window: DraftScheduleWindow; lane: number }>; laneCount: number } {
+  const laneEnds: number[] = [];
+  const placed = windows.map((window) => {
+    const startDay = differenceInCalendarDays(parseISO(window.draftOn), start);
+    const endDay = differenceInCalendarDays(parseISO(window.draftOff), start);
+    let lane = laneEnds.findIndex((laneEnd) => laneEnd < startDay);
+    if (lane === -1) {
+      lane = laneEnds.length;
+      laneEnds.push(endDay);
+    } else {
+      laneEnds[lane] = endDay;
+    }
+    return { window, lane };
+  });
+  return { placed, laneCount: Math.max(laneEnds.length, 1) };
+}
+
 export function DraftScheduleGantt({ sports, today, months }: DraftScheduleGanttProps) {
   const start = parseISO(today);
   const end = addMonths(start, months);
@@ -58,6 +92,12 @@ export function DraftScheduleGantt({ sports, today, months }: DraftScheduleGantt
     .map((date) => ({ date, left: pct(date) }))
     .filter((m) => m.left >= 0 && m.left <= 100);
 
+  // Pre-compute lane assignment + height for each sport row.
+  const rows = sports.map((sport) => {
+    const { placed, laneCount } = assignLanes(sport.windows, start);
+    return { sport, placed, height: rowHeight(laneCount) };
+  });
+
   if (sports.length === 0) {
     return (
       <Card>
@@ -106,10 +146,11 @@ export function DraftScheduleGantt({ sports, today, months }: DraftScheduleGantt
             {/* Sport labels column */}
             <div className="w-40 shrink-0">
               <div className="h-8" aria-hidden="true" />
-              {sports.map((sport) => (
+              {rows.map(({ sport, height }) => (
                 <div
                   key={sport.id}
-                  className="flex h-11 items-center border-b border-border/50 pr-2"
+                  style={{ height }}
+                  className="flex items-center border-b border-border/50 pr-2"
                 >
                   <span className="truncate text-sm font-medium" title={sport.name}>
                     {sport.name}
@@ -150,17 +191,18 @@ export function DraftScheduleGantt({ sports, today, months }: DraftScheduleGantt
               </div>
 
               {/* Rows */}
-              {sports.map((sport) => (
+              {rows.map(({ sport, placed, height }) => (
                 <div
                   key={sport.id}
-                  className="relative h-11 border-b border-border/50"
+                  style={{ height }}
+                  className="relative border-b border-border/50"
                 >
-                  {sport.windows.length === 0 ? (
+                  {placed.length === 0 ? (
                     <span className="absolute left-2 top-1/2 -translate-y-1/2 text-xs italic text-muted-foreground/70">
                       No draft window
                     </span>
                   ) : (
-                    sport.windows.map((w) => {
+                    placed.map(({ window: w, lane }) => {
                       const left = clampPct(pct(parseISO(w.draftOn)));
                       const right = clampPct(pct(parseISO(w.draftOff)));
                       const width = Math.max(right - left, 0.75);
@@ -168,10 +210,12 @@ export function DraftScheduleGantt({ sports, today, months }: DraftScheduleGantt
                         <Link
                           key={w.id}
                           to={`/admin/sports-seasons/${w.id}`}
-                          className="absolute top-1/2 flex h-6 -translate-y-1/2 items-center overflow-hidden rounded px-1.5 text-xs font-medium text-background transition-opacity hover:opacity-80"
+                          className="absolute flex items-center overflow-hidden rounded px-1.5 text-xs font-medium text-background transition-opacity hover:opacity-80"
                           style={{
                             left: `${left}%`,
                             width: `${width}%`,
+                            top: ROW_V_PAD / 2 + lane * LANE_HEIGHT,
+                            height: LANE_HEIGHT - LANE_GAP,
                             backgroundColor: STATUS_COLORS[w.status],
                           }}
                           title={`${w.name} (${w.year}) · ${w.draftOn} → ${w.draftOff}`}

app/components/admin/__tests__/DraftScheduleGantt.test.tsx

@@ -36,6 +36,35 @@ describe("DraftScheduleGantt", () => {
     expect(bar).toHaveAttribute("href", "/admin/sports-seasons/ss-1");
   });
 
+  it("renders overlapping windows as separate, clickable bars", () => {
+    const overlappingWindow = {
+      id: "ss-2",
+      name: "2027 NBA Playoffs",
+      year: 2027,
+      status: "active" as const,
+      draftOn: "2026-08-15",
+      draftOff: "2026-10-01",
+      sport: { id: "nba", name: "NBA", slug: "nba", iconUrl: null },
+    };
+
+    renderGantt([
+      {
+        id: "nba",
+        name: "NBA",
+        slug: "nba",
+        iconUrl: null,
+        windows: [nbaWindow, overlappingWindow],
+      },
+    ]);
+
+    expect(
+      screen.getByRole("link", { name: /2026 NBA Playoffs/ })
+    ).toHaveAttribute("href", "/admin/sports-seasons/ss-1");
+    expect(
+      screen.getByRole("link", { name: /2027 NBA Playoffs/ })
+    ).toHaveAttribute("href", "/admin/sports-seasons/ss-2");
+  });
+
   it("shows a 'No draft window' hint for a sport with no windows", () => {
     renderGantt([
       { id: "golf", name: "Golf", slug: "golf", iconUrl: null, windows: [] },

app/models/sports-season.ts

@@ -194,7 +194,7 @@ export async function findDraftScheduleForHorizon(
   monthsAhead: number
 ): Promise<DraftScheduleWindow[]> {
   const db = database();
-  const horizonEnd = sql`CURRENT_DATE + (${monthsAhead} * interval '1 month')`;
+  const horizonEnd = sql`CURRENT_DATE + make_interval(months => ${monthsAhead})`;
   const seasons = await db.query.sportsSeasons.findMany({
     where: (ss, { and }) =>
       and(

app/routes/admin.draft-schedule.tsx

@@ -91,7 +91,8 @@ export default function AdminDraftSchedule({ loaderData }: Route.ComponentProps)
             </CardTitle>
             <CardDescription className="text-amber-700 dark:text-amber-400/80">
               {sportsWithoutCoverage.length} sport
-              {sportsWithoutCoverage.length !== 1 ? "s" : ""} have no draft window
+              {sportsWithoutCoverage.length !== 1 ? "s" : ""}{" "}
+              {sportsWithoutCoverage.length !== 1 ? "have" : "has"} no draft window
               open or upcoming in the next {months} months.
             </CardDescription>
           </CardHeader>