[rooms] room progression

apps/rooms/migrations/0025_room_xp.sql

@@ -0,0 +1,17 @@
+-- Room experience — the XP a player has earned in one room.
+--
+-- Generated from packages/domain/src/room-xp-db.ts (ROOM_XP_SCHEMA_DDL) — keep in sync.
+--
+-- One row per (room, player), read by `GET /rooms/:id/experience/player` as `Experience`.
+-- A player with no row reads as 0 XP; reads never insert. The `ConcurrencyCode` that
+-- response carries is minted per response, not stored.
+--
+-- Whether a room has progression on, and its daily cap, live on the room blob
+-- (`progressionEnabled` / `progressionDailyLimit`, set by `POST /rooms/:id/experience`).
+
+CREATE TABLE IF NOT EXISTS room_xp (
+  room_id INTEGER NOT NULL,
+  player_id INTEGER NOT NULL,
+  xp INTEGER NOT NULL DEFAULT 0,
+  PRIMARY KEY (room_id, player_id)
+);

apps/rooms/src/openapi.ts

@@ -395,17 +395,34 @@ export const SearchSuggestions = z
 
 /**
  * `GET /rooms/{roomId}/experience` — whether players earn XP in a room and how much of it
- * counts in a day. A bare two-key object, no envelope.
- *
- * Nothing here meters per-room XP: progression is the `api` worker's, and it applies no
- * room-scoped daily cap. So this is the config the client reads, not a limit this server
- * enforces — the same answer for every room.
+ * counts in a day. A bare two-key object, no envelope. Read off the room blob
+ * (`progressionEnabled` / `progressionDailyLimit`), which `POST /rooms/{roomId}/experience`
+ * sets; a room that has never been configured is off with a 0 cap.
  */
 export const RoomExperience = z.object({
-	Enabled: z.boolean().describe('Whether XP is earned in the room at all. Always false here'),
+	Enabled: z.boolean().describe('Whether XP is earned in the room at all'),
 	DailyLimit: z.int().describe('XP from this room that counts toward a player’s day'),
 })
 
+/** `POST /rooms/{roomId}/experience/player` — add XP to the caller’s total in the room. */
+export const ExperienceIncrementRequest = z.object({
+	increment: z.string().describe('XP to add, as an integer; a missing or non-numeric one adds 0'),
+	concurrencyCode: z
+		.string()
+		.optional()
+		.describe(
+			'The GUID from the last read. Accepted and ignored — nothing is stored to check it against'
+		),
+})
+
+/** `POST /rooms/{roomId}/experience` — the client’s .NET-style form body. */
+export const ExperienceRequest = z.object({
+	enabled: z.string().describe('`True` / `False`'),
+	dailyLimit: z
+		.string()
+		.describe('XP from this room that counts toward a player’s day, as an integer'),
+})
+
 /**
  * `GET /dormroom/me` — the dorm's `RoomId` as a BARE JSON number, not a room and not an
  * envelope around one. The caller follows it with `GET /rooms/{roomId}` when it wants the
@@ -1074,12 +1091,27 @@ export const PlayerDataRequest = z.object({
 })
 
 /**
- * `GET /rooms/{roomId}/experience/player` — the caller's per-room experience/progression
- * entries. Stubbed empty; the element shape is unknown until something stores one.
+ * `GET /rooms/{roomId}/experience/player` — the caller's experience in this room, from the
+ * `room_xp` row for (room, caller). No row is 0 XP. `ConcurrencyCode` is minted per
+ * response, not stored.
  */
-export const RoomExperiencePlayer = z
-	.array(z.unknown())
-	.describe('Always empty — no per-room experience is tracked')
+export const RoomExperiencePlayer = z.object({
+	RoomExperienceEnabled: z.boolean().describe('The room’s `Enabled`, echoed'),
+	Experience: z.int().describe('XP the caller has earned in this room; 0 when none is recorded'),
+	ConcurrencyCode: z.string().describe('A GUID minted for this response; not stored'),
+})
+
+/**
+ * What `POST /rooms/{roomId}/experience/player` answers: the read’s DTO wrapped in the
+ * leaderboard write’s bare envelope — PascalCase `Success`/`Error` with a lowercase
+ * `error_id` — with `Value` first. The read serves the DTO BARE; only the write wraps it.
+ */
+export const RoomExperiencePlayerEnvelope = z.object({
+	Value: RoomExperiencePlayer.describe('The caller’s experience in the room, after the add'),
+	Success: z.boolean(),
+	Error: z.string().nullable().describe('Null on success'),
+	error_id: z.string().nullable().describe('Null. Lowercase, unlike its siblings'),
+})
 
 /**
  * `GET /showcase/{playerId}` — the rooms a player showcases on their profile. Stubbed

apps/rooms/src/rooms.app.ts

@@ -40,6 +40,7 @@ import {
 	getRoomBans,
 	getRoomById,
 	getRoomByName,
+	getRoomExperience,
 	getRoomsByCreator,
 	getRoomsByIds,
 	getSimilarRooms,
@@ -50,6 +51,7 @@ import {
 	getSubRoomSaves,
 	getTrendingRooms,
 	getVisitedRooms,
+	incrementRoomExperience,
 	inviteRoomRole,
 	isMissingStudioAssetTable,
 	isPlayerBannedFromRoom,
@@ -64,6 +66,7 @@ import {
 	removeRoomRole,
 	Role,
 	roomNameRejection,
+	roomProgression,
 	roomRoles,
 	saveSubRoomData,
 	searchRooms,
@@ -72,6 +75,7 @@ import {
 	setRoomImage,
 	setRoomLeaderboard,
 	setRoomName,
+	setRoomProgression,
 	setRoomRole,
 	setSubRoomPermissions,
 	sha256HexToBase64,
@@ -112,6 +116,8 @@ import {
 	CuratedPlaylists,
 	DescriptionRequest,
 	DormRoomId,
+	ExperienceIncrementRequest,
+	ExperienceRequest,
 	FeaturedRoomGroupDto,
 	FORBIDDEN_RESPONSE,
 	form,
@@ -150,6 +156,7 @@ import {
 	RoomEnvelope,
 	RoomExperience,
 	RoomExperiencePlayer,
+	RoomExperiencePlayerEnvelope,
 	roomIdParam,
 	RoomLookup,
 	RoomPascalEnvelope,
@@ -1023,6 +1030,9 @@ function leaderboardEnvelope(c: Context<App>, error: string | null = null) {
 	return c.json({ Success: error === null, Error: error, error_id: null })
 }
 
+/** The same bare envelope for the room progression write (`POST /rooms/:id/experience`). */
+const experienceEnvelope = leaderboardEnvelope
+
 /** Rooms created/owned by the authed caller (shared by the createdby routes). */
 async function ownedRooms(c: Context<App>) {
 	const accountId = await authedAccountId(c)
@@ -1044,19 +1054,6 @@ async function ownedRoomsExcludingDorm(c: Context<App>) {
 /** Suggestions `/rooms/autocomplete_search` returns when the client names no `take`. */
 const DEFAULT_SUGGESTION_COUNT = 10
 
-/**
- * The XP settings every room reports (`GET /rooms/{roomId}/experience`). Constants because
- * nothing stores them per room and nothing enforces them: the `api` worker's progression
- * grants XP without a room-scoped daily cap, so these are what the client is told, not a
- * limit this server applies.
- *
- * Disabled, which is the honest answer here — no room awards XP. `DailyLimit` is kept at
- * the reference's number rather than zeroed: it is the cap that WOULD apply, and the client
- * reads both keys whatever `Enabled` says.
- */
-const ROOM_XP_ENABLED = false
-const ROOM_XP_DAILY_LIMIT = 1000
-
 const app = new Hono<App>()
 	.use(
 		'*',
@@ -4504,14 +4501,9 @@ const app = new Hono<App>()
 	)
 
 	// A room's XP settings — whether players earn experience there and how much of it counts
-	// toward their day. Fixed values, the same for every room: progression lives in the `api`
-	// worker and applies no per-room daily cap, so there is nothing room-scoped to read and
-	// nothing here enforces the number. It is what the client displays and meters against.
-	//
-	// A bare two-key object, no `{ success, error, value }` envelope, and no auth — nothing
-	// in the answer is per-player (`experience/player` below is the per-player half). The
-	// room isn't looked up either: the answer would be the same for a room that doesn't
-	// exist, so a lookup would only add a way to fail.
+	// toward their day. Stored on the room blob by the POST below; a room that was never
+	// configured is off with a 0 cap. A bare two-key object, no envelope, and no auth —
+	// nothing in the answer is per-player (`experience/player` below is that half).
 	.get(
 		'/rooms/:roomId{[0-9]+}/experience',
 		describeRoute({
@@ -4519,33 +4511,172 @@ const app = new Hono<App>()
 			summary: 'A room’s XP settings',
 			description: [
 				'Whether players earn XP in the room (`Enabled`) and how much of it counts toward a',
-				'day (`DailyLimit`), as a bare two-key object. Fixed values, and `Enabled` is FALSE —',
-				'no room awards XP here. Progression is the `api` worker’s and applies no per-room',
-				'cap, so nothing is stored per room and nothing enforces the limit; the client is what',
-				'reads it. No auth: the answer is the same for every caller and every room.',
+				'day (`DailyLimit`), as a bare two-key object — the `progressionEnabled` and',
+				'`progressionDailyLimit` the room’s owner set with `POST /rooms/{roomId}/experience`.',
+				'A room that was never configured is off with a 0 cap. No auth: the answer is the',
+				'same for every caller. 404 for a room that does not exist.',
 			].join(' '),
 			parameters: [roomIdParam],
-			responses: { 200: json(RoomExperience, 'The room’s XP settings — always the same') },
+			responses: {
+				200: json(RoomExperience, 'The room’s XP settings'),
+				404: { description: 'No such room' },
+			},
 		}),
-		(c) => c.json({ Enabled: ROOM_XP_ENABLED, DailyLimit: ROOM_XP_DAILY_LIMIT })
+		async (c) => {
+			const roomId = Number.parseInt(c.req.param('roomId'), 10)
+			const room = await getRoomById(c.env.DB, roomId)
+			if (!room) return c.body(null, 404)
+			return c.json(roomProgression(room))
+		}
 	)
 
-	// The caller's per-room experience/progression. Stub → empty list.
+	// Turn a room's progression on or off and set its daily cap. Auth-gated (401) and
+	// owner/co-owner-only (403), like the leaderboard write, and answers the same bare
+	// `{ Success, Error, error_id }` envelope. Body is the client's .NET-style form:
+	// `enabled=True&dailyLimit=1000`.
+	.post(
+		'/rooms/:roomId{[0-9]+}/experience',
+		describeRoute({
+			tags: ['Room settings'],
+			summary: 'Set a room’s XP settings',
+			description: [
+				'Sets `progressionEnabled` and `progressionDailyLimit` on the room, which',
+				'`GET /rooms/{roomId}/experience` reads back as `Enabled`/`DailyLimit`. Owner or',
+				'co-owner only (403 otherwise). `enabled` is the client’s `True`/`False` string —',
+				'anything but a `true` reads false; `dailyLimit` is an integer, and a missing or',
+				'non-numeric one is 0.',
+				'',
+				'Answers a bare `{ Success, Error, error_id }` — PascalCase with a lowercase',
+				'`error_id`, like the leaderboard write, carrying no entity. An unknown room is a',
+				'rejection envelope, not a 404.',
+			].join('\n'),
+			security: AUTHED,
+			parameters: [roomIdParam],
+			requestBody: form(ExperienceRequest, 'The room’s XP settings'),
+			responses: {
+				200: json(LeaderboardResultEnvelope, 'Stored, or a rejection with `Success: false`'),
+				401: UNAUTHORIZED_RESPONSE,
+				403: FORBIDDEN_RESPONSE,
+			},
+		}),
+		async (c) => {
+			const accountId = await authedAccountId(c)
+			if (accountId === null) return unauthorized(c)
+
+			const roomId = Number.parseInt(c.req.param('roomId'), 10)
+			const room = await getRoomById(c.env.DB, roomId)
+			if (!room) return experienceEnvelope(c, 'This room does not exist!')
+			if (!canManageRoom(room, accountId)) return c.body(null, 403)
+
+			const body = (await c.req.parseBody().catch(() => ({}))) as Record<string, unknown>
+			const enabled = typeof body.enabled === 'string' && body.enabled.toLowerCase() === 'true'
+			const dailyLimit =
+				typeof body.dailyLimit === 'string' ? Number.parseInt(body.dailyLimit, 10) : Number.NaN
+
+			await setRoomProgression(c.env.DB, roomId, enabled, Number.isNaN(dailyLimit) ? 0 : dailyLimit)
+			return experienceEnvelope(c)
+		}
+	)
+
+	// The caller's experience in this room: the `room_xp` row for (room, caller), with the
+	// room's switch echoed so the client knows whether what it earns here counts. A player
+	// with no row is 0 XP — reading never writes a row. `ConcurrencyCode` is a GUID minted
+	// per response; it only travels in requests and is not stored.
 	.get(
 		'/rooms/:roomId{[0-9]+}/experience/player',
 		describeRoute({
 			tags: ['Rooms'],
 			summary: 'The caller’s per-room experience',
 			description: [
-				'Per-room experience/progression for the calling player. Nothing tracks any yet, so',
-				'this is an empty list — which the client reads as “no progress in this room”, where',
-				'a 404 would stall the room load. No auth: the answer is the same for every caller',
-				'until something writes here.',
+				'The calling player’s XP in this room (`Experience`), the room’s `Enabled` echoed as',
+				'`RoomExperienceEnabled`, and a `ConcurrencyCode` GUID minted for this response (not',
+				'stored). A player who has earned nothing here reads as 0 — no row is written on a read.',
+				'Auth-gated (401); 404 for a room that does not exist.',
 			].join(' '),
+			security: AUTHED,
 			parameters: [roomIdParam],
-			responses: { 200: json(RoomExperiencePlayer, 'An empty list') },
+			responses: {
+				200: json(RoomExperiencePlayer, 'The caller’s experience in the room'),
+				401: UNAUTHORIZED_RESPONSE,
+				404: { description: 'No such room' },
+			},
 		}),
-		(c) => c.json([])
+		async (c) => {
+			const accountId = await authedAccountId(c)
+			if (accountId === null) return unauthorized(c)
+
+			const roomId = Number.parseInt(c.req.param('roomId'), 10)
+			const room = await getRoomById(c.env.DB, roomId)
+			if (!room) return c.body(null, 404)
+
+			return c.json({
+				RoomExperienceEnabled: roomProgression(room).Enabled,
+				Experience: await getRoomExperience(c.env.DB, roomId, accountId),
+				ConcurrencyCode: crypto.randomUUID(),
+			})
+		}
+	)
+
+	// Add to the caller's XP in this room. Auth-gated (401), 404 for no such room. Body is
+	// the client's form `increment=2500&concurrencyCode=<guid>`; the code is accepted and
+	// ignored (nothing is stored to check it against). Answers the read's DTO — with the
+	// NEW total and a fresh code — WRAPPED in the leaderboard write's `{ Value, Success,
+	// Error, error_id }` envelope; the read serves it bare. The room's switch and daily cap
+	// are not enforced here — the increment lands whatever they say.
+	.post(
+		'/rooms/:roomId{[0-9]+}/experience/player',
+		describeRoute({
+			tags: ['Rooms'],
+			summary: 'Add to the caller’s per-room experience',
+			description: [
+				'Adds `increment` to the calling player’s XP in this room, creating their `room_xp`',
+				'row on the first write, and answers the read’s DTO with the new total and a fresh',
+				'`ConcurrencyCode`, wrapped in `{ Value, Success, Error, error_id }` — the read serves',
+				'it bare. The posted `concurrencyCode` is accepted and ignored.',
+				'A missing or non-numeric `increment` adds 0. Neither the room’s `Enabled` nor its',
+				'`DailyLimit` is enforced. Auth-gated (401); 404 for a room that does not exist.',
+			].join(' '),
+			security: AUTHED,
+			parameters: [roomIdParam],
+			requestBody: form(ExperienceIncrementRequest, 'The XP to add'),
+			responses: {
+				200: json(
+					RoomExperiencePlayerEnvelope,
+					'The caller’s experience in the room, after the add'
+				),
+				401: UNAUTHORIZED_RESPONSE,
+				404: { description: 'No such room' },
+			},
+		}),
+		async (c) => {
+			const accountId = await authedAccountId(c)
+			if (accountId === null) return unauthorized(c)
+
+			const roomId = Number.parseInt(c.req.param('roomId'), 10)
+			const room = await getRoomById(c.env.DB, roomId)
+			if (!room) return c.body(null, 404)
+
+			const body = (await c.req.parseBody().catch(() => ({}))) as Record<string, unknown>
+			const increment =
+				typeof body.increment === 'string' ? Number.parseInt(body.increment, 10) : Number.NaN
+
+			const experience = await incrementRoomExperience(
+				c.env.DB,
+				roomId,
+				accountId,
+				Number.isNaN(increment) ? 0 : increment
+			)
+			return c.json({
+				Value: {
+					RoomExperienceEnabled: roomProgression(room).Enabled,
+					Experience: experience,
+					ConcurrencyCode: crypto.randomUUID(),
+				},
+				Success: true,
+				Error: null,
+				error_id: null,
+			})
+		}
 	)
 
 	// Single room by id. 404 when the room isn't in D1. A Studio save's

apps/rooms/src/test/integration/api.test.ts

@@ -22,6 +22,7 @@ import {
 	ROOM_INSTANCE_SCHEMA_DDL,
 	ROOM_INVITE_SCHEMA_DDL,
 	ROOM_SCHEMA_DDL,
+	ROOM_XP_SCHEMA_DDL,
 	seedRoomWithSubRooms,
 	sha256HexToBase64,
 	STUDIO_UNITY_ASSET_SCHEMA_DDL,
@@ -132,6 +133,8 @@ beforeAll(async () => {
 	for (const stmt of ROOM_INVITE_SCHEMA_DDL) await env.DB.prepare(stmt).run()
 	// Baked unity asset bundles — what `POST /unity_assets/baked/bulk` serves.
 	for (const stmt of UNITY_ASSET_SCHEMA_DDL) await env.DB.prepare(stmt).run()
+	// Per-room XP — what `GET /rooms/:id/experience/player` reads.
+	for (const stmt of ROOM_XP_SCHEMA_DDL) await env.DB.prepare(stmt).run()
 	// Seed each room and split its subrooms into the subroom table (mirrors 0007's backfill).
 	for (const r of importRooms) await seedRoomWithSubRooms(env.DB, r as Record<string, unknown>)
 
@@ -201,14 +204,6 @@ describe('rooms endpoints', () => {
 		})
 	})
 
-	// Stub. Registered (not 404) matters more than the body: the client asks for this on
-	// room entry, and an unregistered path stalls the load rather than erroring visibly.
-	it('GET /rooms/:id/experience/player returns [] for any room', async () => {
-		const res = await SELF.fetch(`${ORIGIN}/rooms/92/experience/player`)
-		expect(res.status).toBe(200)
-		expect(await res.json()).toEqual([])
-	})
-
 	// Stub, same reasoning: the profile asks for a showcase for any player, and an
 	// unregistered path leaves the profile half-drawn. No auth, and no such player is
 	// still [] rather than a 404.
@@ -548,25 +543,16 @@ describe('rooms endpoints', () => {
 		await env.DB.prepare('DELETE FROM room WHERE room_id BETWEEN 30401 AND 30407').run()
 	})
 
-	it('GET /rooms/:roomId/experience serves the fixed XP settings, no auth', async () => {
+	it('GET /rooms/:roomId/experience serves the room’s stored XP settings, no auth', async () => {
 		const res = await SELF.fetch(`${ORIGIN}/rooms/2/experience`)
 		expect(res.status).toBe(200)
-		// A bare two-key object — no `{ success, error, value }` envelope around it. Disabled:
-		// no room awards XP here, and DailyLimit is the cap that would apply if one did.
-		expect(await res.json()).toEqual({ Enabled: false, DailyLimit: 1000 })
+		// A bare two-key object — no `{ success, error, value }` envelope around it. A room
+		// nobody has configured is off with a 0 cap.
+		expect(await res.json()).toEqual({ Enabled: false, DailyLimit: 0 })
 
-		// Nothing is stored per room, so every room answers the same — including one that
-		// doesn't exist, which is never looked up.
-		expect(await (await SELF.fetch(`${ORIGIN}/rooms/77/experience`)).json()).toEqual({
-			Enabled: false,
-			DailyLimit: 1000,
-		})
-		expect(await (await SELF.fetch(`${ORIGIN}/rooms/99999/experience`)).json()).toEqual({
-			Enabled: false,
-			DailyLimit: 1000,
-		})
-
-		// The id is digits-only, like the other room-scoped routes.
+		// A room that doesn't exist is a 404, and the id is digits-only like the other
+		// room-scoped routes.
+		expect((await SELF.fetch(`${ORIGIN}/rooms/99999/experience`)).status).toBe(404)
 		expect((await SELF.fetch(`${ORIGIN}/rooms/abc/experience`)).status).toBe(404)
 	})
 
@@ -2721,6 +2707,110 @@ describe('rooms endpoints', () => {
 		await env.DB.prepare('DELETE FROM room_leaderboard WHERE room_id IN (2, 3)').run()
 	})
 
+	it('POST /rooms/:id/experience sets a room’s progression, which the GETs read back', async () => {
+		// RecCenter (room 2) is owned by account 1, with account 2 as co-owner.
+		const getXp = async (roomId: number, sub?: string) =>
+			SELF.fetch(`${ORIGIN}/rooms/${roomId}/experience/player`, {
+				headers: sub ? await bearer(sub) : {},
+			})
+		// The real client body, verbatim.
+		const body = { enabled: 'True', dailyLimit: '1000' }
+		// The same bare envelope as the leaderboard write.
+		const OK = { Success: true, Error: null, error_id: null }
+
+		// No token → 401; a valid token but no role on the room → 403.
+		expect((await postForm('/rooms/2/experience', body)).status).toBe(401)
+		expect((await postForm('/rooms/2/experience', body, '999')).status).toBe(403)
+		// Unknown room → failure envelope, not a 404.
+		expect(await (await postForm('/rooms/99999/experience', body, '1')).json()).toEqual({
+			Success: false,
+			Error: 'This room does not exist!',
+			error_id: null,
+		})
+
+		// The owner turns it on, and the room-level GET reads it back as a bare pair.
+		const ok = await postForm('/rooms/2/experience', body, '1')
+		expect(ok.status).toBe(200)
+		expect(await ok.json()).toEqual(OK)
+		expect(await (await SELF.fetch(`${ORIGIN}/rooms/2/experience`)).json()).toEqual({
+			Enabled: true,
+			DailyLimit: 1000,
+		})
+		// It lands on the room blob under the names the room DTO carries.
+		const room = (await (await SELF.fetch(`${ORIGIN}/rooms/2`)).json()) as Record<string, unknown>
+		expect(room).toMatchObject({ progressionEnabled: true, progressionDailyLimit: 1000 })
+
+		// The per-player read is auth-gated, 404 for no such room, and echoes the switch. A
+		// player with no XP recorded here is 0 — and nothing is written by reading. The
+		// `ConcurrencyCode` is a GUID minted per response, not stored.
+		expect((await getXp(2)).status).toBe(401)
+		expect((await getXp(99999, '999')).status).toBe(404)
+		const fresh = (await (await getXp(2, '999')).json()) as {
+			RoomExperienceEnabled: boolean
+			Experience: number
+			ConcurrencyCode: string
+		}
+		expect(fresh).toMatchObject({ RoomExperienceEnabled: true, Experience: 0 })
+		expect(fresh.ConcurrencyCode).toMatch(/^[0-9a-f-]{36}$/)
+		expect(
+			await env.DB.prepare('SELECT 1 FROM room_xp WHERE room_id = 2 AND player_id = 999').first()
+		).toBeNull()
+
+		// The increment write creates the row on first use and answers the read's DTO with the
+		// new total, wrapped in the leaderboard write's envelope — the read serves it bare. The
+		// real client body, verbatim; the code is accepted and ignored.
+		const add = { increment: '2500', concurrencyCode: '79e10fb4-1956-4251-b482-9f21d76c3776' }
+		const addXp = async (roomId: number, fields: Record<string, string>, sub: string) =>
+			(await (await postForm(`/rooms/${roomId}/experience/player`, fields, sub)).json()) as {
+				Value: { RoomExperienceEnabled: boolean; Experience: number; ConcurrencyCode: string }
+				Success: boolean
+				Error: string | null
+				error_id: string | null
+			}
+		expect((await postForm('/rooms/2/experience/player', add)).status).toBe(401)
+		expect((await postForm('/rooms/99999/experience/player', add, '999')).status).toBe(404)
+		const added = await addXp(2, add, '999')
+		expect(added).toMatchObject({
+			Value: { RoomExperienceEnabled: true, Experience: 2500 },
+			Success: true,
+			Error: null,
+			error_id: null,
+		})
+		expect(added.Value.ConcurrencyCode).toMatch(/^[0-9a-f-]{36}$/)
+		// It accumulates, per (room, player); the read serves the running total.
+		expect((await addXp(2, { increment: '250' }, '999')).Value.Experience).toBe(2750)
+		expect((await addXp(3, { increment: '1' }, '999')).Value.Experience).toBe(1)
+		expect(await (await getXp(2, '999')).json()).toMatchObject({
+			RoomExperienceEnabled: true,
+			Experience: 2750,
+		})
+		// A missing increment adds nothing.
+		expect((await addXp(2, {}, '999')).Value.Experience).toBe(2750)
+
+		// A stored row serves its XP.
+		await env.DB.prepare('UPDATE room_xp SET xp = 1250 WHERE room_id = 2 AND player_id = 999').run()
+		expect(await (await getXp(2, '999')).json()).toMatchObject({
+			RoomExperienceEnabled: true,
+			Experience: 1250,
+		})
+
+		// The co-owner may turn it off; `enabled` parses case-insensitively, and a missing
+		// or non-numeric `dailyLimit` is 0. Off is echoed to the per-player read.
+		expect(await (await postForm('/rooms/2/experience', { enabled: 'false' }, '2')).json()).toEqual(
+			OK
+		)
+		expect(await (await SELF.fetch(`${ORIGIN}/rooms/2/experience`)).json()).toEqual({
+			Enabled: false,
+			DailyLimit: 0,
+		})
+		expect(await (await getXp(2, '999')).json()).toMatchObject({
+			RoomExperienceEnabled: false,
+			Experience: 1250,
+		})
+
+		await env.DB.prepare('DELETE FROM room_xp WHERE player_id = 999').run()
+	})
+
 	it('POST /rooms/:id/bans takes a reason and a duration', async () => {
 		type Ban = { Reason: string | null; ExpiresAt: string | null; CreatedAt: string }
 		type Sent = { playerIds: number[]; data: { duration: number; isBan: boolean; message: string } }
@@ -5841,6 +5931,8 @@ describe('rooms endpoints', () => {
 			'POST /rooms/bulk',
 			'POST /rooms/{roomId}/bans',
 			'POST /rooms/{roomId}/clone',
+			'POST /rooms/{roomId}/experience',
+			'POST /rooms/{roomId}/experience/player',
 			'POST /rooms/{roomId}/leaderboards/{leaderboardId}',
 			'POST /rooms/{roomId}/subrooms',
 			'POST /rooms/{roomId}/subrooms/{subRoomId}/clone',