diff --git a/src/lib/server/db/schema.ts b/src/lib/server/db/schema.ts
index 0cb8087..6caa026 100644
--- a/src/lib/server/db/schema.ts
+++ b/src/lib/server/db/schema.ts
@@ -157,3 +157,56 @@ export const matchGameScore = pgTable(
 	},
 	(t) => [index('idx_mgs_game').on(t.matchGameId)]
 );
+
+import { relations } from 'drizzle-orm';
+
+// ── Relations ───────────────────────────────────────────────────────────
+
+export const teamRelations = relations(team, ({ many }) => ({
+	members: many(teamMember)
+}));
+
+export const teamMemberRelations = relations(teamMember, ({ one }) => ({
+	team: one(team, { fields: [teamMember.teamId], references: [team.id] })
+}));
+
+export const mappoolRelations = relations(mappool, ({ many }) => ({
+	slots: many(mappoolSlot)
+}));
+
+export const mappoolSlotRelations = relations(mappoolSlot, ({ one }) => ({
+	mappool: one(mappool, { fields: [mappoolSlot.mappoolId], references: [mappool.id] })
+}));
+
+export const matchRelations = relations(match, ({ one, many }) => ({
+	mappool: one(mappool, { fields: [match.mappoolId], references: [mappool.id] }),
+	participants: many(matchParticipant),
+	games: many(matchGame)
+}));
+
+export const matchParticipantRelations = relations(matchParticipant, ({ one, many }) => ({
+	match: one(match, { fields: [matchParticipant.matchId], references: [match.id] }),
+	team: one(team, { fields: [matchParticipant.teamId], references: [team.id] }),
+	players: many(matchParticipantPlayer)
+}));
+
+export const matchParticipantPlayerRelations = relations(matchParticipantPlayer, ({ one }) => ({
+	participant: one(matchParticipant, {
+		fields: [matchParticipantPlayer.participantId],
+		references: [matchParticipant.id]
+	})
+}));
+
+export const matchGameRelations = relations(matchGame, ({ one, many }) => ({
+	match: one(match, { fields: [matchGame.matchId], references: [match.id] }),
+	slot: one(mappoolSlot, { fields: [matchGame.mappoolSlotId], references: [mappoolSlot.id] }),
+	scores: many(matchGameScore)
+}));
+
+export const matchGameScoreRelations = relations(matchGameScore, ({ one }) => ({
+	game: one(matchGame, { fields: [matchGameScore.matchGameId], references: [matchGame.id] }),
+	player: one(matchParticipantPlayer, {
+		fields: [matchGameScore.playerId],
+		references: [matchParticipantPlayer.id]
+	})
+}));
diff --git a/src/routes/api/mappools/+server.ts b/src/routes/api/mappools/+server.ts
new file mode 100644
index 0000000..6e40215
--- /dev/null
+++ b/src/routes/api/mappools/+server.ts
@@ -0,0 +1,33 @@
+import { json, error } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { mappool } from '$lib/server/db/schema';
+import type { RequestHandler } from './$types';
+
+// List all mappools
+export const GET: RequestHandler = async ({ locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	const mappools = await db.query.mappool.findMany({
+		orderBy: (m, { desc }) => [desc(m.createdAt)]
+	});
+
+	return json(mappools);
+};
+
+// Create a mappool
+export const POST: RequestHandler = async ({ request, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	const { name } = await request.json();
+	if (!name?.trim()) error(400, 'Name is required');
+
+	const [created] = await db
+		.insert(mappool)
+		.values({
+			name: name.trim(),
+			createdBy: locals.user.id
+		})
+		.returning();
+
+	return json(created, { status: 201 });
+};
diff --git a/src/routes/api/mappools/[id]/+server.ts b/src/routes/api/mappools/[id]/+server.ts
new file mode 100644
index 0000000..72fdcd0
--- /dev/null
+++ b/src/routes/api/mappools/[id]/+server.ts
@@ -0,0 +1,31 @@
+import { json, error } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { mappool, mappoolSlot } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+import type { RequestHandler } from './$types';
+
+// Get a mappool with its slots
+export const GET: RequestHandler = async ({ params, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	const pool = await db.query.mappool.findFirst({
+		where: eq(mappool.id, params.id)
+	});
+
+	if (!pool) error(404, 'Mappool not found');
+
+	const slots = await db.query.mappoolSlot.findMany({
+		where: eq(mappoolSlot.mappoolId, params.id),
+		orderBy: (s, { asc }) => [asc(s.category), asc(s.orderInCategory)]
+	});
+
+	return json({ ...pool, slots });
+};
+
+// Delete a mappool
+export const DELETE: RequestHandler = async ({ params, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	await db.delete(mappool).where(eq(mappool.id, params.id));
+	return json({ ok: true });
+};
diff --git a/src/routes/api/mappools/[id]/slots/+server.ts b/src/routes/api/mappools/[id]/slots/+server.ts
new file mode 100644
index 0000000..8bb257c
--- /dev/null
+++ b/src/routes/api/mappools/[id]/slots/+server.ts
@@ -0,0 +1,38 @@
+import { json, error } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { mappoolSlot } from '$lib/server/db/schema';
+import { eq, and } from 'drizzle-orm';
+import { getBeatmap } from '$lib/server/osu/api';
+import type { RequestHandler } from './$types';
+
+// Add a slot to a mappool
+export const POST: RequestHandler = async ({ params, request, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	const { beatmapId, category, mods } = await request.json();
+
+	if (!beatmapId || !category) {
+		error(400, 'beatmapId and category are required');
+	}
+
+	// Count existing slots in this category to auto-increment order
+	const existing = await db.query.mappoolSlot.findMany({
+		where: and(
+			eq(mappoolSlot.mappoolId, params.id),
+			eq(mappoolSlot.category, category.toUpperCase())
+		)
+	});
+
+	const [created] = await db
+		.insert(mappoolSlot)
+		.values({
+			mappoolId: params.id,
+			beatmapId: String(beatmapId),
+			category: category.toUpperCase(),
+			orderInCategory: existing.length + 1,
+			mods: mods ?? []
+		})
+		.returning();
+
+	return json(created, { status: 201 });
+};
diff --git a/src/routes/api/mappools/[id]/slots/[slotId]/+server.ts b/src/routes/api/mappools/[id]/slots/[slotId]/+server.ts
new file mode 100644
index 0000000..f53f26f
--- /dev/null
+++ b/src/routes/api/mappools/[id]/slots/[slotId]/+server.ts
@@ -0,0 +1,12 @@
+import { json, error } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { mappoolSlot } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+import type { RequestHandler } from './$types';
+
+export const DELETE: RequestHandler = async ({ params, locals }) => {
+	if (!locals.user) error(401, 'Not logged in');
+
+	await db.delete(mappoolSlot).where(eq(mappoolSlot.id, params.slotId));
+	return json({ ok: true });
+};