feat: add competition heats system backend

- Add 3 new database tables: divisions, competition_types, event_user_heats
- Add seed data for 6 divisions (NEW, NOV, INT, ADV, ALL, CHA) and 2 competition types (J&J, STR)
- Add API endpoints for divisions and competition types
- Add heats management endpoints in events route (POST/GET/DELETE)
- Implement unique constraint: cannot have same role in same division+competition type
- Add participant verification before allowing heats management
- Support heat numbers 1-9 with optional Leader/Follower role

backend/prisma/migrations/20251114142504_add_competition_heats_system/migration.sql

@@ -0,0 +1,66 @@
+-- CreateTable
+CREATE TABLE "divisions" (
+    "id" SERIAL NOT NULL,
+    "name" VARCHAR(50) NOT NULL,
+    "abbreviation" VARCHAR(3) NOT NULL,
+    "display_order" INTEGER NOT NULL,
+
+    CONSTRAINT "divisions_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "competition_types" (
+    "id" SERIAL NOT NULL,
+    "name" VARCHAR(50) NOT NULL,
+    "abbreviation" VARCHAR(3) NOT NULL,
+
+    CONSTRAINT "competition_types_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "event_user_heats" (
+    "id" SERIAL NOT NULL,
+    "user_id" INTEGER NOT NULL,
+    "event_id" INTEGER NOT NULL,
+    "division_id" INTEGER NOT NULL,
+    "competition_type_id" INTEGER NOT NULL,
+    "heat_number" INTEGER NOT NULL,
+    "role" VARCHAR(10),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "event_user_heats_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "divisions_name_key" ON "divisions"("name");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "divisions_abbreviation_key" ON "divisions"("abbreviation");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "competition_types_name_key" ON "competition_types"("name");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "competition_types_abbreviation_key" ON "competition_types"("abbreviation");
+
+-- CreateIndex
+CREATE INDEX "event_user_heats_user_id_event_id_idx" ON "event_user_heats"("user_id", "event_id");
+
+-- CreateIndex
+CREATE INDEX "event_user_heats_event_id_idx" ON "event_user_heats"("event_id");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "event_user_heats_user_id_event_id_division_id_competition_t_key" ON "event_user_heats"("user_id", "event_id", "division_id", "competition_type_id", "role");
+
+-- AddForeignKey
+ALTER TABLE "event_user_heats" ADD CONSTRAINT "event_user_heats_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "event_user_heats" ADD CONSTRAINT "event_user_heats_event_id_fkey" FOREIGN KEY ("event_id") REFERENCES "events"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "event_user_heats" ADD CONSTRAINT "event_user_heats_division_id_fkey" FOREIGN KEY ("division_id") REFERENCES "divisions"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "event_user_heats" ADD CONSTRAINT "event_user_heats_competition_type_id_fkey" FOREIGN KEY ("competition_type_id") REFERENCES "competition_types"("id") ON DELETE RESTRICT ON UPDATE CASCADE;