diff --git a/app/features/tournament-lfg/TournamentLFGRepository.server.test.ts b/app/features/tournament-lfg/TournamentLFGRepository.server.test.ts
new file mode 100644
index 000000000..97205e502
--- /dev/null
+++ b/app/features/tournament-lfg/TournamentLFGRepository.server.test.ts
@@ -0,0 +1,631 @@
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
+import { db } from "~/db/sql";
+import { dbInsertUsers, dbReset } from "~/utils/Test";
+import * as TournamentLFGRepository from "./TournamentLFGRepository.server";
+
+const createTournament = () =>
+	db
+		.insertInto("Tournament")
+		.values({
+			mapPickingStyle: "TO",
+			settings: JSON.stringify({ bracketProgression: [] }),
+		})
+		.returning("id")
+		.executeTakeFirstOrThrow();
+
+const createGroup = (tournamentId: number, userId: number) =>
+	TournamentLFGRepository.createGroup({ tournamentId, userId });
+
+describe("createGroup", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(2);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("creates a group with owner member", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(1);
+		expect(groups[0].id).toBe(group.id);
+	});
+
+	test("owner has OWNER role", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+
+		expect(members[0].role).toBe("OWNER");
+	});
+});
+
+describe("findGroupsByTournamentId", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(3);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("returns groups for given tournament", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+		await createGroup(tournament.id, 2);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(2);
+	});
+
+	test("returns empty array when no groups exist", async () => {
+		const tournament = await createTournament();
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(0);
+	});
+
+	test("returns groups with member data", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+
+		expect(members[0].id).toBe(1);
+		expect(members[0].username).toBeDefined();
+		expect(members[0].role).toBe("OWNER");
+	});
+
+	test("does not return groups from other tournaments", async () => {
+		const tournament1 = await createTournament();
+		const tournament2 = await createTournament();
+		await createGroup(tournament1.id, 1);
+		await createGroup(tournament2.id, 2);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament1.id,
+		);
+
+		expect(groups).toHaveLength(1);
+	});
+});
+
+describe("addLike / deleteLike", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(2);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("adds a like between two groups", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group1.id);
+
+		expect(likes.given).toHaveLength(1);
+		expect(likes.given[0].groupId).toBe(group2.id);
+	});
+
+	test("duplicate like does not throw", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group1.id);
+
+		expect(likes.given).toHaveLength(1);
+	});
+
+	test("deleteLike removes the like", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+		await TournamentLFGRepository.deleteLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group1.id);
+
+		expect(likes.given).toHaveLength(0);
+	});
+});
+
+describe("allLikesByGroupId", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(3);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("separates likes into given and received", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+		const group3 = await createGroup(tournament.id, 3);
+
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group2.id,
+		});
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group3.id,
+			targetGroupId: group1.id,
+		});
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group1.id);
+
+		expect(likes.given).toHaveLength(1);
+		expect(likes.given[0].groupId).toBe(group2.id);
+		expect(likes.received).toHaveLength(1);
+		expect(likes.received[0].groupId).toBe(group3.id);
+	});
+
+	test("returns empty given/received when no likes", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group.id);
+
+		expect(likes.given).toHaveLength(0);
+		expect(likes.received).toHaveLength(0);
+	});
+});
+
+describe("morphGroups", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(5);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("merges two groups, other group is deleted", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.morphGroups({
+			survivingGroupId: group1.id,
+			otherGroupId: group2.id,
+			maxGroupSize: 4,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(1);
+		expect(groups[0].id).toBe(group1.id);
+		const members = groups[0].members;
+		expect(members).toHaveLength(2);
+	});
+
+	test("demotes other group's OWNER to MANAGER", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.morphGroups({
+			survivingGroupId: group1.id,
+			otherGroupId: group2.id,
+			maxGroupSize: 4,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+		const user2Member = members.find((m) => m.id === 2);
+
+		expect(user2Member?.role).toBe("MANAGER");
+	});
+
+	test("throws when merged size exceeds maxGroupSize", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+
+		await expect(
+			TournamentLFGRepository.morphGroups({
+				survivingGroupId: group1.id,
+				otherGroupId: group2.id,
+				maxGroupSize: 1,
+			}),
+		).rejects.toThrow("Group has too many members after merge");
+	});
+
+	test("clears likes on surviving group after merge", async () => {
+		const tournament = await createTournament();
+		const group1 = await createGroup(tournament.id, 1);
+		const group2 = await createGroup(tournament.id, 2);
+		const group3 = await createGroup(tournament.id, 3);
+
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group1.id,
+			targetGroupId: group3.id,
+		});
+		await TournamentLFGRepository.addLike({
+			likerGroupId: group3.id,
+			targetGroupId: group1.id,
+		});
+
+		await TournamentLFGRepository.morphGroups({
+			survivingGroupId: group1.id,
+			otherGroupId: group2.id,
+			maxGroupSize: 4,
+		});
+
+		const likes = await TournamentLFGRepository.allLikesByGroupId(group1.id);
+
+		expect(likes.given).toHaveLength(0);
+		expect(likes.received).toHaveLength(0);
+	});
+});
+
+describe("updateMemberNote", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(1);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("sets and clears a member note", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await TournamentLFGRepository.updateMemberNote({
+			groupId: group.id,
+			userId: 1,
+			value: "Looking for support",
+		});
+
+		let groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		let members = groups[0].members;
+		expect(members[0].note).toBe("Looking for support");
+
+		await TournamentLFGRepository.updateMemberNote({
+			groupId: group.id,
+			userId: 1,
+			value: null,
+		});
+
+		groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		members = groups[0].members;
+		expect(members[0].note).toBeNull();
+	});
+});
+
+describe("updateMemberRole", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(2);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("changes role from REGULAR to MANAGER", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await db
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: group.id,
+				tournamentId: tournament.id,
+				userId: 2,
+				role: "REGULAR",
+			})
+			.execute();
+
+		await TournamentLFGRepository.updateMemberRole({
+			userId: 2,
+			groupId: group.id,
+			role: "MANAGER",
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+		const user2Member = members.find((m) => m.id === 2);
+
+		expect(user2Member?.role).toBe("MANAGER");
+	});
+
+	test("throws when attempting to set OWNER role", () => {
+		expect(() =>
+			TournamentLFGRepository.updateMemberRole({
+				userId: 1,
+				groupId: 1,
+				role: "OWNER",
+			}),
+		).toThrow("Can't set role to OWNER with this function");
+	});
+});
+
+describe("updateStayAsSub", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(1);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("toggles isStayAsSub on/off", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await TournamentLFGRepository.updateStayAsSub({
+			groupId: group.id,
+			userId: 1,
+			value: true,
+		});
+
+		let subs = await TournamentLFGRepository.getSubsForTournament(
+			tournament.id,
+		);
+		expect(subs).toContain(1);
+
+		await TournamentLFGRepository.updateStayAsSub({
+			groupId: group.id,
+			userId: 1,
+			value: false,
+		});
+
+		subs = await TournamentLFGRepository.getSubsForTournament(tournament.id);
+		expect(subs).not.toContain(1);
+	});
+});
+
+describe("leaveGroup", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(3);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("removes member from group", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await db
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: group.id,
+				tournamentId: tournament.id,
+				userId: 2,
+				role: "REGULAR",
+			})
+			.execute();
+
+		await TournamentLFGRepository.leaveGroup({
+			userId: 2,
+			tournamentId: tournament.id,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+
+		expect(members).toHaveLength(1);
+		expect(members[0].id).toBe(1);
+	});
+
+	test("deletes group when last member leaves", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+
+		await TournamentLFGRepository.leaveGroup({
+			userId: 1,
+			tournamentId: tournament.id,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(0);
+	});
+
+	test("promotes MANAGER to OWNER when owner leaves", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await db
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: group.id,
+				tournamentId: tournament.id,
+				userId: 2,
+				role: "MANAGER",
+			})
+			.execute();
+
+		await db
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: group.id,
+				tournamentId: tournament.id,
+				userId: 3,
+				role: "REGULAR",
+			})
+			.execute();
+
+		await TournamentLFGRepository.leaveGroup({
+			userId: 1,
+			tournamentId: tournament.id,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+		const newOwner = members.find((m) => m.id === 2);
+
+		expect(newOwner?.role).toBe("OWNER");
+	});
+
+	test("promotes first member to OWNER when owner leaves and no manager exists", async () => {
+		const tournament = await createTournament();
+		const group = await createGroup(tournament.id, 1);
+
+		await db
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: group.id,
+				tournamentId: tournament.id,
+				userId: 2,
+				role: "REGULAR",
+			})
+			.execute();
+
+		await TournamentLFGRepository.leaveGroup({
+			userId: 1,
+			tournamentId: tournament.id,
+		});
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+		const members = groups[0].members;
+
+		expect(members[0].role).toBe("OWNER");
+	});
+});
+
+describe("getSubsForTournament", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(2);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("returns userIds with isStayAsSub", async () => {
+		const tournament = await createTournament();
+		await TournamentLFGRepository.createGroup({
+			tournamentId: tournament.id,
+			userId: 1,
+			isStayAsSub: true,
+		});
+		await createGroup(tournament.id, 2);
+
+		const subs = await TournamentLFGRepository.getSubsForTournament(
+			tournament.id,
+		);
+
+		expect(subs).toEqual([1]);
+	});
+
+	test("returns empty when nobody opted in", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+
+		const subs = await TournamentLFGRepository.getSubsForTournament(
+			tournament.id,
+		);
+
+		expect(subs).toHaveLength(0);
+	});
+});
+
+describe("cleanupForTournamentStart", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(2);
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("deletes all groups for a tournament", async () => {
+		const tournament = await createTournament();
+		await createGroup(tournament.id, 1);
+		await createGroup(tournament.id, 2);
+
+		await TournamentLFGRepository.cleanupForTournamentStart(tournament.id);
+
+		const groups = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament.id,
+		);
+
+		expect(groups).toHaveLength(0);
+	});
+
+	test("does not affect groups from other tournaments", async () => {
+		const tournament1 = await createTournament();
+		const tournament2 = await createTournament();
+		await createGroup(tournament1.id, 1);
+		await createGroup(tournament2.id, 2);
+
+		await TournamentLFGRepository.cleanupForTournamentStart(tournament1.id);
+
+		const groups1 = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament1.id,
+		);
+		const groups2 = await TournamentLFGRepository.findGroupsByTournamentId(
+			tournament2.id,
+		);
+
+		expect(groups1).toHaveLength(0);
+		expect(groups2).toHaveLength(1);
+	});
+});
diff --git a/app/features/tournament-lfg/TournamentLFGRepository.server.ts b/app/features/tournament-lfg/TournamentLFGRepository.server.ts
index 66431f27b..59d85ba65 100644
--- a/app/features/tournament-lfg/TournamentLFGRepository.server.ts
+++ b/app/features/tournament-lfg/TournamentLFGRepository.server.ts
@@ -1,2 +1,361 @@
-// Phase 4: Implement repository functions here
-// See SQGroupRepository.server.ts for pattern reference
+import type { Transaction } from "kysely";
+import { jsonBuildObject } from "kysely/helpers/sqlite";
+import { db } from "~/db/sql";
+import type { DB, Tables } from "~/db/tables";
+import { shortNanoid } from "~/utils/id";
+import invariant from "~/utils/invariant";
+import { userChatNameColorForJson } from "~/utils/kysely.server";
+import { errorIsSqliteForeignKeyConstraintFailure } from "~/utils/sql";
+
+type CreateGroupArgs = {
+	tournamentId: number;
+	userId: number;
+	isStayAsSub?: boolean;
+};
+export function createGroup(args: CreateGroupArgs) {
+	return db.transaction().execute(async (trx) => {
+		const createdGroup = await trx
+			.insertInto("TournamentLFGGroup")
+			.values({
+				tournamentId: args.tournamentId,
+				chatCode: shortNanoid(),
+			})
+			.returning("id")
+			.executeTakeFirstOrThrow();
+
+		await trx
+			.insertInto("TournamentLFGGroupMember")
+			.values({
+				groupId: createdGroup.id,
+				tournamentId: args.tournamentId,
+				userId: args.userId,
+				role: "OWNER",
+				isStayAsSub: args.isStayAsSub ? 1 : 0,
+			})
+			.execute();
+
+		return createdGroup;
+	});
+}
+
+type TournamentLFGMemberObject = {
+	id: Tables["User"]["id"];
+	username: Tables["User"]["username"];
+	discordId: Tables["User"]["discordId"];
+	discordAvatar: Tables["User"]["discordAvatar"];
+	customUrl: Tables["User"]["customUrl"];
+	languages: Tables["User"]["languages"];
+	vc: Tables["User"]["vc"];
+	role: Tables["TournamentLFGGroupMember"]["role"];
+	note: Tables["TournamentLFGGroupMember"]["note"];
+	isStayAsSub: Tables["TournamentLFGGroupMember"]["isStayAsSub"];
+	weapons: Tables["User"]["qWeaponPool"];
+	chatNameColor: string | null;
+	plusTier: Tables["PlusTier"]["tier"] | null;
+};
+
+export async function findGroupsByTournamentId(tournamentId: number) {
+	return db
+		.selectFrom("TournamentLFGGroup")
+		.innerJoin(
+			"TournamentLFGGroupMember",
+			"TournamentLFGGroupMember.groupId",
+			"TournamentLFGGroup.id",
+		)
+		.innerJoin("User", "User.id", "TournamentLFGGroupMember.userId")
+		.leftJoin("PlusTier", "PlusTier.userId", "User.id")
+		.select(({ fn, eb }) => [
+			"TournamentLFGGroup.id",
+			"TournamentLFGGroup.chatCode",
+			"TournamentLFGGroup.tournamentTeamId",
+			"TournamentLFGGroup.visibility",
+			fn
+				.agg("json_group_array", [
+					jsonBuildObject({
+						id: eb.ref("User.id"),
+						username: eb.ref("User.username"),
+						discordId: eb.ref("User.discordId"),
+						discordAvatar: eb.ref("User.discordAvatar"),
+						customUrl: eb.ref("User.customUrl"),
+						languages: eb.ref("User.languages"),
+						vc: eb.ref("User.vc"),
+						role: eb.ref("TournamentLFGGroupMember.role"),
+						note: eb.ref("TournamentLFGGroupMember.note"),
+						isStayAsSub: eb.ref("TournamentLFGGroupMember.isStayAsSub"),
+						weapons: eb.ref("User.qWeaponPool"),
+						chatNameColor: userChatNameColorForJson,
+						plusTier: eb.ref("PlusTier.tier"),
+					}),
+				])
+				.$castTo<TournamentLFGMemberObject[]>()
+				.as("members"),
+		])
+		.where("TournamentLFGGroup.tournamentId", "=", tournamentId)
+		.groupBy("TournamentLFGGroup.id")
+		.execute();
+}
+
+export function morphGroups({
+	survivingGroupId,
+	otherGroupId,
+	maxGroupSize,
+}: {
+	survivingGroupId: number;
+	otherGroupId: number;
+	maxGroupSize: number;
+}) {
+	return db.transaction().execute(async (trx) => {
+		await trx
+			.updateTable("TournamentLFGGroup")
+			.set({ chatCode: shortNanoid() })
+			.where("TournamentLFGGroup.id", "=", survivingGroupId)
+			.execute();
+
+		const otherGroupMembers = await trx
+			.selectFrom("TournamentLFGGroupMember")
+			.select([
+				"TournamentLFGGroupMember.userId",
+				"TournamentLFGGroupMember.role",
+			])
+			.where("TournamentLFGGroupMember.groupId", "=", otherGroupId)
+			.execute();
+
+		for (const member of otherGroupMembers) {
+			await trx
+				.updateTable("TournamentLFGGroupMember")
+				.set({
+					role: member.role === "OWNER" ? "MANAGER" : member.role,
+					groupId: survivingGroupId,
+				})
+				.where("TournamentLFGGroupMember.groupId", "=", otherGroupId)
+				.where("TournamentLFGGroupMember.userId", "=", member.userId)
+				.execute();
+		}
+
+		await deleteLikesByGroupId(survivingGroupId, trx);
+
+		await trx
+			.deleteFrom("TournamentLFGGroup")
+			.where("TournamentLFGGroup.id", "=", otherGroupId)
+			.execute();
+
+		invariant(
+			await isGroupCorrect(survivingGroupId, trx, maxGroupSize),
+			"Group has too many members after merge",
+		);
+	});
+}
+
+export async function addLike({
+	likerGroupId,
+	targetGroupId,
+}: {
+	likerGroupId: number;
+	targetGroupId: number;
+}) {
+	try {
+		await db
+			.insertInto("TournamentLFGLike")
+			.values({ likerGroupId, targetGroupId })
+			.onConflict((oc) =>
+				oc.columns(["likerGroupId", "targetGroupId"]).doNothing(),
+			)
+			.execute();
+	} catch (error) {
+		if (errorIsSqliteForeignKeyConstraintFailure(error)) {
+			return;
+		}
+		throw error;
+	}
+}
+
+export function deleteLike({
+	likerGroupId,
+	targetGroupId,
+}: {
+	likerGroupId: number;
+	targetGroupId: number;
+}) {
+	return db
+		.deleteFrom("TournamentLFGLike")
+		.where("likerGroupId", "=", likerGroupId)
+		.where("targetGroupId", "=", targetGroupId)
+		.execute();
+}
+
+export async function allLikesByGroupId(groupId: number) {
+	const rows = await db
+		.selectFrom("TournamentLFGLike")
+		.select([
+			"TournamentLFGLike.likerGroupId",
+			"TournamentLFGLike.targetGroupId",
+		])
+		.where((eb) =>
+			eb.or([
+				eb("TournamentLFGLike.likerGroupId", "=", groupId),
+				eb("TournamentLFGLike.targetGroupId", "=", groupId),
+			]),
+		)
+		.execute();
+
+	return {
+		given: rows
+			.filter((row) => row.likerGroupId === groupId)
+			.map((row) => ({ groupId: row.targetGroupId })),
+		received: rows
+			.filter((row) => row.targetGroupId === groupId)
+			.map((row) => ({ groupId: row.likerGroupId })),
+	};
+}
+
+export function updateMemberNote({
+	groupId,
+	userId,
+	value,
+}: {
+	groupId: number;
+	userId: number;
+	value: string | null;
+}) {
+	return db
+		.updateTable("TournamentLFGGroupMember")
+		.set({ note: value })
+		.where("groupId", "=", groupId)
+		.where("userId", "=", userId)
+		.execute();
+}
+
+export function updateMemberRole({
+	userId,
+	groupId,
+	role,
+}: {
+	userId: number;
+	groupId: number;
+	role: Tables["TournamentLFGGroupMember"]["role"];
+}) {
+	if (role === "OWNER") {
+		throw new Error("Can't set role to OWNER with this function");
+	}
+
+	return db
+		.updateTable("TournamentLFGGroupMember")
+		.set({ role })
+		.where("userId", "=", userId)
+		.where("groupId", "=", groupId)
+		.execute();
+}
+
+export function updateStayAsSub({
+	groupId,
+	userId,
+	value,
+}: {
+	groupId: number;
+	userId: number;
+	value: boolean;
+}) {
+	return db
+		.updateTable("TournamentLFGGroupMember")
+		.set({ isStayAsSub: value ? 1 : 0 })
+		.where("groupId", "=", groupId)
+		.where("userId", "=", userId)
+		.execute();
+}
+
+export function leaveGroup({
+	userId,
+	tournamentId,
+}: {
+	userId: number;
+	tournamentId: number;
+}) {
+	return db.transaction().execute(async (trx) => {
+		const userGroup = await trx
+			.selectFrom("TournamentLFGGroupMember")
+			.select([
+				"TournamentLFGGroupMember.groupId",
+				"TournamentLFGGroupMember.role",
+			])
+			.where("TournamentLFGGroupMember.userId", "=", userId)
+			.where("TournamentLFGGroupMember.tournamentId", "=", tournamentId)
+			.executeTakeFirstOrThrow();
+
+		await trx
+			.deleteFrom("TournamentLFGGroupMember")
+			.where("userId", "=", userId)
+			.where("groupId", "=", userGroup.groupId)
+			.execute();
+
+		const remainingMembers = await trx
+			.selectFrom("TournamentLFGGroupMember")
+			.select(["userId", "role"])
+			.where("groupId", "=", userGroup.groupId)
+			.execute();
+
+		if (remainingMembers.length === 0) {
+			await trx
+				.deleteFrom("TournamentLFGGroup")
+				.where("id", "=", userGroup.groupId)
+				.execute();
+			return;
+		}
+
+		if (userGroup.role === "OWNER") {
+			const newOwner =
+				remainingMembers.find((m) => m.role === "MANAGER") ??
+				remainingMembers[0];
+
+			await trx
+				.updateTable("TournamentLFGGroupMember")
+				.set({ role: "OWNER" })
+				.where("userId", "=", newOwner.userId)
+				.where("groupId", "=", userGroup.groupId)
+				.execute();
+		}
+	});
+}
+
+export function cleanupForTournamentStart(tournamentId: number) {
+	return db
+		.deleteFrom("TournamentLFGGroup")
+		.where("TournamentLFGGroup.tournamentId", "=", tournamentId)
+		.execute();
+}
+
+export async function getSubsForTournament(tournamentId: number) {
+	const rows = await db
+		.selectFrom("TournamentLFGGroupMember")
+		.select("TournamentLFGGroupMember.userId")
+		.where("TournamentLFGGroupMember.tournamentId", "=", tournamentId)
+		.where("TournamentLFGGroupMember.isStayAsSub", "=", 1)
+		.execute();
+
+	return rows.map((row) => row.userId);
+}
+
+function deleteLikesByGroupId(groupId: number, trx: Transaction<DB>) {
+	return trx
+		.deleteFrom("TournamentLFGLike")
+		.where((eb) =>
+			eb.or([
+				eb("TournamentLFGLike.likerGroupId", "=", groupId),
+				eb("TournamentLFGLike.targetGroupId", "=", groupId),
+			]),
+		)
+		.execute();
+}
+
+async function isGroupCorrect(
+	groupId: number,
+	trx: Transaction<DB>,
+	maxGroupSize: number,
+): Promise<boolean> {
+	const members = await trx
+		.selectFrom("TournamentLFGGroupMember")
+		.select("TournamentLFGGroupMember.userId")
+		.where("TournamentLFGGroupMember.groupId", "=", groupId)
+		.execute();
+
+	return members.length <= maxGroupSize;
+}
diff --git a/app/features/tournament-lfg/tournament-lfg-schemas.server.ts b/app/features/tournament-lfg/tournament-lfg-schemas.server.ts
index 664e68748..56ab4cb2c 100644
--- a/app/features/tournament-lfg/tournament-lfg-schemas.server.ts
+++ b/app/features/tournament-lfg/tournament-lfg-schemas.server.ts
@@ -33,10 +33,7 @@ export const lookingSchema = z.union([
 		value: z.preprocess(
 			falsyToNull,
 			// xxx: use SendouForm style? (but would need SQ to be migrated too)
-			z
-				.string()
-				.max(TOURNAMENT_LFG.PUBLIC_NOTE_MAX_LENGTH)
-				.nullable(),
+			z.string().max(TOURNAMENT_LFG.PUBLIC_NOTE_MAX_LENGTH).nullable(),
 		),
 	}),
 	z.object({
diff --git a/app/routes.ts b/app/routes.ts
index 88468af24..be93c3bbc 100644
--- a/app/routes.ts
+++ b/app/routes.ts
@@ -108,6 +108,8 @@ export default [
 		route("results", "features/tournament/routes/to.$id.results.tsx"),
 		route("streams", "features/tournament/routes/to.$id.streams.tsx"),
 
+		route("looking", "features/tournament-lfg/routes/to.$id.looking.tsx"),
+
 		route("subs", "features/tournament-subs/routes/to.$id.subs.tsx"),
 		route("subs/new", "features/tournament-subs/routes/to.$id.subs.new.tsx"),
 
diff --git a/db-test.sqlite3 b/db-test.sqlite3
index 7861ee433..87474164b 100644
Binary files a/db-test.sqlite3 and b/db-test.sqlite3 differ