app/models/__tests__/scoring-event-delete.test.ts

@@ -63,4 +63,101 @@ describe("deleteScoringEvent", () => {
       ])
     );
   });
+
+  describe("shared tournament handling", () => {
+    // Builds a mock db for a non-qualifying schedule_event linked to a tournament,
+    // so the delete skips the QP/league branches and exercises only the
+    // shared-tournament bookkeeping.
+    function makeSharedDb({
+      deletedEvent,
+      remaining,
+      siblingTournamentId = "tournament-1",
+    }: {
+      deletedEvent: { tournamentId: string | null; isPrimary: boolean };
+      remaining: Array<{ id: string; isPrimary: boolean }>;
+      siblingTournamentId?: string;
+    }) {
+      const findFirst = vi
+        .fn()
+        // 1st call: the event being deleted
+        .mockResolvedValueOnce({
+          id: "event-1",
+          sportsSeasonId: "sports-season-1",
+          eventType: "schedule_event",
+          isQualifyingEvent: false,
+          ...deletedEvent,
+        })
+        // subsequent calls: setPrimaryEvent looking up the promoted event
+        .mockResolvedValue({ id: "promoted", tournamentId: siblingTournamentId });
+
+      const deleteWhere = vi.fn().mockResolvedValue(undefined);
+      const updateWhere = vi.fn().mockResolvedValue(undefined);
+      const db = {
+        query: {
+          scoringEvents: {
+            findFirst,
+            findMany: vi.fn().mockResolvedValue(remaining),
+          },
+        },
+        transaction: vi.fn(async (callback) => callback(db)),
+        delete: vi.fn(() => ({ where: deleteWhere })),
+        update: vi.fn(() => ({ set: vi.fn(() => ({ where: updateWhere })) })),
+      } as any;
+      return { db, deleteWhere };
+    }
+
+    it("keeps the tournament and promotes nothing when a non-primary window is deleted", async () => {
+      const { db } = makeSharedDb({
+        deletedEvent: { tournamentId: "tournament-1", isPrimary: false },
+        remaining: [{ id: "event-2", isPrimary: true }],
+      });
+
+      const result = await deleteScoringEvent("event-1", db);
+
+      expect(result.remainingWindows).toBe(1);
+      expect(result.promotedPrimaryId).toBeNull();
+      expect(result.deletedTournament).toBe(false);
+    });
+
+    it("promotes the earliest remaining window when the primary window is deleted", async () => {
+      const { db } = makeSharedDb({
+        deletedEvent: { tournamentId: "tournament-1", isPrimary: true },
+        // findMany is ordered asc(createdAt); first is the earliest.
+        remaining: [
+          { id: "event-2", isPrimary: false },
+          { id: "event-3", isPrimary: false },
+        ],
+      });
+
+      const result = await deleteScoringEvent("event-1", db);
+
+      expect(result.promotedPrimaryId).toBe("event-2");
+      expect(result.remainingWindows).toBe(2);
+    });
+
+    it("leaves the orphaned tournament intact when the last window is deleted without the flag", async () => {
+      const { db } = makeSharedDb({
+        deletedEvent: { tournamentId: "tournament-1", isPrimary: true },
+        remaining: [],
+      });
+
+      const result = await deleteScoringEvent("event-1", db);
+
+      expect(result.remainingWindows).toBe(0);
+      expect(result.deletedTournament).toBe(false);
+    });
+
+    it("deletes the orphaned tournament when the last window is deleted with the flag", async () => {
+      const { db } = makeSharedDb({
+        deletedEvent: { tournamentId: "tournament-1", isPrimary: true },
+        remaining: [],
+      });
+
+      const result = await deleteScoringEvent("event-1", db, {
+        deleteOrphanTournament: true,
+      });
+
+      expect(result.deletedTournament).toBe(true);
+    });
+  });
 });

app/models/__tests__/tournament.test.ts

@@ -11,6 +11,7 @@ import {
   findTournamentBySportNameYear,
   upsertTournament,
   updateTournamentStatus,
+  deleteTournament,
 } from "../tournament";
 import { database } from "~/database/context";
 
@@ -172,3 +173,26 @@ describe("updateTournamentStatus", () => {
     expect(result.status).toBe("in_progress");
   });
 });
+
+describe("deleteTournament", () => {
+  it("deletes the tournament row by id", async () => {
+    const where = vi.fn().mockResolvedValue(undefined);
+    const db = { delete: vi.fn().mockReturnValue({ where }) };
+    vi.mocked(database).mockReturnValue(db as never);
+
+    await deleteTournament(TOURNAMENT_ID);
+
+    expect(db.delete).toHaveBeenCalledTimes(1);
+    expect(where).toHaveBeenCalledTimes(1);
+  });
+
+  it("uses a provided db when passed (transaction)", async () => {
+    const where = vi.fn().mockResolvedValue(undefined);
+    const providedDb = { delete: vi.fn().mockReturnValue({ where }) };
+
+    await deleteTournament(TOURNAMENT_ID, providedDb as never);
+
+    expect(providedDb.delete).toHaveBeenCalledTimes(1);
+    expect(vi.mocked(database)).not.toHaveBeenCalled();
+  });
+});

app/models/scoring-event.ts

@@ -5,6 +5,7 @@ import type { BracketRegion } from "~/lib/bracket-templates";
 import { recalculateAffectedLeagues } from "./scoring-calculator";
 import { hasProcessedQualifyingPlacement, recalculateParticipantQP } from "./qualifying-points";
 import { findParticipantNamesByIds } from "./season-participant";
+import { deleteTournament } from "./tournament";
 import type { EventType } from "./scoring-event-types";
 export { type EventType, getEventTypeLabel } from "./scoring-event-types";
 
@@ -201,17 +202,46 @@ export async function completeScoringEvent(
  * sports season (placements are stored there with no FK back to the event) and
  * recalculates league standings.
  */
+export interface DeleteScoringEventOptions {
+  /**
+   * When this was the last window linked to its shared tournament, also delete
+   * the now-orphaned canonical tournament (and its results). No-op when other
+   * windows remain. Off by default so deleting one season's event never touches
+   * the shared tournament unless explicitly requested.
+   */
+  deleteOrphanTournament?: boolean;
+}
+
+export interface DeleteScoringEventResult {
+  /** The shared tournament this event was linked to, if any. */
+  tournamentId: string | null;
+  /** How many other windows still link to that tournament after the delete. */
+  remainingWindows: number;
+  /** Event promoted to primary because the deleted event was the primary window. */
+  promotedPrimaryId: string | null;
+  /** Whether the orphaned canonical tournament was deleted. */
+  deletedTournament: boolean;
+}
+
 export async function deleteScoringEvent(
   eventId: string,
-  providedDb?: ReturnType<typeof database>
-) {
+  providedDb?: ReturnType<typeof database>,
+  opts?: DeleteScoringEventOptions
+): Promise<DeleteScoringEventResult> {
   const db = providedDb || database();
 
   const event = await db.query.scoringEvents.findFirst({
     where: eq(schema.scoringEvents.id, eventId),
   });
 
-  if (!event) return;
+  if (!event) {
+    return {
+      tournamentId: null,
+      remainingWindows: 0,
+      promotedPrimaryId: null,
+      deletedTournament: false,
+    };
+  }
 
   // For qualifying events: capture affected participant IDs before the cascade deletes
   // eventResults (which is how we know who had QP awarded from this event).
@@ -260,6 +290,41 @@ export async function deleteScoringEvent(
 
     await recalculateAffectedLeagues(event.sportsSeasonId, db);
   }
+
+  // Shared-tournament bookkeeping: keep the primary window valid and optionally
+  // clean up a canonical tournament left with no windows.
+  let remainingWindows = 0;
+  let promotedPrimaryId: string | null = null;
+  let deletedTournament = false;
+
+  if (event.tournamentId) {
+    const remaining = await db.query.scoringEvents.findMany({
+      where: eq(schema.scoringEvents.tournamentId, event.tournamentId),
+      orderBy: asc(schema.scoringEvents.createdAt),
+    });
+    remainingWindows = remaining.length;
+
+    if (remaining.length > 0) {
+      // Auto-heal: if the deleted event was the primary window (or no sibling is
+      // flagged primary anymore), promote the earliest remaining window so the
+      // shared major stays scorable and fan-out stays deterministic.
+      const hasPrimary = remaining.some((e) => e.isPrimary);
+      if (event.isPrimary || !hasPrimary) {
+        await setPrimaryEvent(remaining[0].id, db);
+        promotedPrimaryId = remaining[0].id;
+      }
+    } else if (opts?.deleteOrphanTournament) {
+      await deleteTournament(event.tournamentId, db);
+      deletedTournament = true;
+    }
+  }
+
+  return {
+    tournamentId: event.tournamentId,
+    remainingWindows,
+    promotedPrimaryId,
+    deletedTournament,
+  };
 }
 
 /**

app/models/tournament.ts

@@ -136,3 +136,17 @@ export async function updateTournamentStatus(
     .returning();
   return tournament;
 }
+
+/**
+ * Delete a canonical tournament. The DB cascades remove its tournament_results;
+ * any surviving scoring_events have their tournamentId set to NULL (onDelete:
+ * "set null"). Callers should only use this once the last linked window has been
+ * removed, so no scoring events are left pointing at it.
+ */
+export async function deleteTournament(
+  id: string,
+  providedDb?: ReturnType<typeof database>
+): Promise<void> {
+  const db = providedDb || database();
+  await db.delete(schema.tournaments).where(eq(schema.tournaments.id, id));
+}

app/routes/admin.sports-seasons.$id.events.server.ts

@@ -8,6 +8,7 @@ import {
   deleteScoringEvent,
   bulkCreateScoringEvents,
   ensurePrimaryEvent,
+  getSportsSeasonsByTournament,
   type CreateScoringEventData,
 } from "~/models/scoring-event";
 import { isBracketMajor } from "~/lib/event-utils";
@@ -59,11 +60,39 @@ export async function loader({ params }: Route.LoaderArgs) {
   );
   const availableTournaments = allTournamentsForSport.filter((t) => !linkedTournamentIds.has(t.id));
 
+  // Shared-tournament context for the delete confirmation dialog: for each event
+  // linked to a canonical tournament, how many OTHER seasons ("windows") also use
+  // it, and the tournament's name. Lets the UI explain exactly what a delete does.
+  const sharedInfo = new Map<string, { name: string; windowCount: number }>();
+  await Promise.all(
+    [...linkedTournamentIds].map(async (tid) => {
+      const [tournament, windows] = await Promise.all([
+        allTournamentsForSport.find((t) => t.id === tid)
+          ? Promise.resolve(allTournamentsForSport.find((t) => t.id === tid)!)
+          : getTournamentById(tid),
+        getSportsSeasonsByTournament(tid),
+      ]);
+      sharedInfo.set(tid, {
+        name: tournament?.name ?? "shared tournament",
+        windowCount: windows.length,
+      });
+    })
+  );
+
+  const eventsWithSharing = events.map((e) => {
+    const info = e.tournamentId ? sharedInfo.get(e.tournamentId) : null;
+    return {
+      ...e,
+      tournamentName: info?.name ?? null,
+      otherWindowCount: info ? Math.max(0, info.windowCount - 1) : 0,
+    };
+  });
+
   return {
     sportsSeason: sportsSeason as typeof sportsSeason & {
       sport: { id: string; name: string; type: string; slug: string };
     },
-    events,
+    events: eventsWithSharing,
     qpStandings,
     scoringRules,
     availableTournaments,
@@ -215,8 +244,19 @@ export async function action({ request, params }: Route.ActionArgs) {
     }
 
     try {
-      await deleteScoringEvent(eventId);
-      return { success: "Event deleted successfully" };
+      const result = await deleteScoringEvent(eventId, undefined, {
+        deleteOrphanTournament: formData.get("deleteTournament") === "1",
+      });
+      let success = "Event deleted";
+      if (result.deletedTournament) {
+        success = "Event deleted and its shared tournament removed";
+      } else if (result.tournamentId && result.remainingWindows > 0) {
+        success = `Event removed from this season (shared tournament kept — still used by ${result.remainingWindows} season${result.remainingWindows !== 1 ? "s" : ""})`;
+        if (result.promotedPrimaryId) {
+          success += "; another season was promoted to primary";
+        }
+      }
+      return { success };
     } catch (error) {
       logger.error("Error deleting event:", error);
       return { error: "Failed to delete event" };

app/routes/admin.sports-seasons.$id.events.tsx

@@ -305,7 +305,11 @@ export default function SportsSeasonEvents({
                 </p>
               ) : (
                 <div className="space-y-3">
-                  {events.map((event: { id: string; name: string; eventType: string; eventDate?: string | null; eventStartsAt?: Date | string | null; isComplete: boolean }) => (
+                  {events.map((event: { id: string; name: string; eventType: string; eventDate?: string | null; eventStartsAt?: Date | string | null; isComplete: boolean; tournamentId: string | null; isPrimary: boolean; tournamentName: string | null; otherWindowCount: number }) => {
+                  const isLinked = !!event.tournamentId;
+                  const hasOtherWindows = event.otherWindowCount > 0;
+                  const isLastWindow = isLinked && !hasOtherWindows;
+                  return (
                     <Card key={event.id} className="hover:border-primary/50 transition-colors">
                       <CardContent className="pt-6">
                         <div className="flex items-start justify-between gap-4">
@@ -352,28 +356,65 @@ export default function SportsSeasonEvents({
                               </Button>
                             </AlertDialogTrigger>
                             <AlertDialogContent>
-                              <AlertDialogHeader>
-                                <AlertDialogTitle>Delete "{event.name}"?</AlertDialogTitle>
-                                <AlertDialogDescription>
-                                  This will also delete all results for this event. This action cannot be undone.
-                                </AlertDialogDescription>
-                              </AlertDialogHeader>
-                              <AlertDialogFooter>
-                                <AlertDialogCancel>Cancel</AlertDialogCancel>
-                                <Form method="post">
-                                  <input type="hidden" name="intent" value="delete-event" />
-                                  <input type="hidden" name="eventId" value={event.id} />
+                              <Form method="post">
+                                <input type="hidden" name="intent" value="delete-event" />
+                                <input type="hidden" name="eventId" value={event.id} />
+                                <AlertDialogHeader>
+                                  <AlertDialogTitle>Delete "{event.name}"?</AlertDialogTitle>
+                                  <AlertDialogDescription asChild>
+                                    {!isLinked ? (
+                                      <span>
+                                        This will also delete all results for this event. This action cannot be undone.
+                                      </span>
+                                    ) : hasOtherWindows ? (
+                                      <span>
+                                        This event is part of the shared tournament{" "}
+                                        <span className="font-medium">"{event.tournamentName}"</span>, also used by{" "}
+                                        <span className="font-medium">
+                                          {event.otherWindowCount} other season{event.otherWindowCount !== 1 ? "s" : ""}
+                                        </span>
+                                        . Deleting removes it from <span className="font-medium">this season only</span> — the
+                                        tournament and the other seasons keep their data.
+                                        {event.isPrimary && (
+                                          <> This is the primary scoring window, so another season will be promoted to primary automatically.</>
+                                        )}
+                                      </span>
+                                    ) : (
+                                      <span>
+                                        This is the only season linked to the shared tournament{" "}
+                                        <span className="font-medium">"{event.tournamentName}"</span>. Deleting removes this
+                                        event and its results. This action cannot be undone.
+                                      </span>
+                                    )}
+                                  </AlertDialogDescription>
+                                </AlertDialogHeader>
+                                {isLastWindow && (
+                                  <label className="flex items-start gap-2 text-sm my-2 cursor-pointer">
+                                    <input
+                                      type="checkbox"
+                                      name="deleteTournament"
+                                      value="1"
+                                      className="mt-0.5 h-4 w-4 rounded border-input"
+                                    />
+                                    <span>
+                                      Also delete the shared tournament and its recorded results
+                                    </span>
+                                  </label>
+                                )}
+                                <AlertDialogFooter>
+                                  <AlertDialogCancel>Cancel</AlertDialogCancel>
                                   <AlertDialogAction type="submit" className="bg-destructive text-destructive-foreground hover:bg-destructive/90">
                                     Delete
                                   </AlertDialogAction>
-                                </Form>
-                              </AlertDialogFooter>
+                                </AlertDialogFooter>
+                              </Form>
                             </AlertDialogContent>
                           </AlertDialog>
                         </div>
                       </CardContent>
                     </Card>
-                  ))}
+                  );
+                  })}
                 </div>
               )}
             </CardContent>

app/routes/admin.tournaments.$id.tsx

@@ -21,6 +21,7 @@ import {
   getSportsSeasonsByTournament,
   getPrimaryEventForTournament,
   setPrimaryEvent,
+  deleteScoringEvent,
 } from "~/models/scoring-event";
 import { isBracketMajor } from "~/lib/event-utils";
 import {
@@ -30,6 +31,17 @@ import {
   CardHeader,
   CardTitle,
 } from "~/components/ui/card";
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+  AlertDialogTrigger,
+} from "~/components/ui/alert-dialog";
 import { Badge } from "~/components/ui/badge";
 import { Button } from "~/components/ui/button";
 import {
@@ -214,6 +226,26 @@ export async function action(args: Route.ActionArgs) {
     }
   }
 
+  if (intent === "unlink-window") {
+    const eventId = formData.get("eventId");
+    if (typeof eventId !== "string" || !eventId) {
+      return { success: false as const, error: "Event ID is required", syncReport: null };
+    }
+    try {
+      // Remove that season's scoring event. The tournament stays (we're on its
+      // page); if this was the primary window, another is auto-promoted.
+      await deleteScoringEvent(eventId);
+      return { success: true as const, error: null, syncReport: null };
+    } catch (error) {
+      logger.error("unlink-window failed:", error);
+      return {
+        success: false as const,
+        error: error instanceof Error ? error.message : "Failed to remove season",
+        syncReport: null,
+      };
+    }
+  }
+
   return {
     success: false as const,
     error: "Invalid intent",
@@ -236,6 +268,7 @@ export default function AdminTournamentDetail({
   } = loaderData;
   const retryFetcher = useFetcher<typeof action>();
   const primaryFetcher = useFetcher<typeof action>();
+  const unlinkFetcher = useFetcher<typeof action>();
 
   // For bracket majors, scoring lives on the primary window's bracket/stage UI.
   const primaryScoringHref =
@@ -419,6 +452,51 @@ export default function AdminTournamentDetail({
                       >
                         {link.sportsSeason.status}
                       </Badge>
+                      <AlertDialog>
+                        <AlertDialogTrigger asChild>
+                          <Button
+                            type="button"
+                            variant="ghost"
+                            size="sm"
+                            className="text-destructive hover:text-destructive"
+                            disabled={unlinkFetcher.state !== "idle"}
+                          >
+                            Remove
+                          </Button>
+                        </AlertDialogTrigger>
+                        <AlertDialogContent>
+                          <AlertDialogHeader>
+                            <AlertDialogTitle>
+                              Remove {link.sportsSeason.sport.name} - {link.sportsSeason.name}?
+                            </AlertDialogTitle>
+                            <AlertDialogDescription asChild>
+                              <span>
+                                This deletes that season's scoring event (and its results) but keeps{" "}
+                                <span className="font-medium">{tournament.name}</span> and the other linked seasons.
+                                {link.isPrimary && linkedSportsSeasons.length > 1 && (
+                                  <> Because this is the primary scoring window, another season will be promoted to primary automatically.</>
+                                )}
+                                {linkedSportsSeasons.length === 1 && (
+                                  <> This is the only linked season — the tournament will remain but have no windows until you link one again.</>
+                                )}
+                              </span>
+                            </AlertDialogDescription>
+                          </AlertDialogHeader>
+                          <AlertDialogFooter>
+                            <AlertDialogCancel>Cancel</AlertDialogCancel>
+                            <unlinkFetcher.Form method="post">
+                              <input type="hidden" name="intent" value="unlink-window" />
+                              <input type="hidden" name="eventId" value={link.id} />
+                              <AlertDialogAction
+                                type="submit"
+                                className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
+                              >
+                                Remove
+                              </AlertDialogAction>
+                            </unlinkFetcher.Form>
+                          </AlertDialogFooter>
+                        </AlertDialogContent>
+                      </AlertDialog>
                     </div>
                   </div>
                 ))}