diff --git a/clientapi/clientapi.go b/clientapi/clientapi.go
index 174eb1bf1..8ea84249a 100644
--- a/clientapi/clientapi.go
+++ b/clientapi/clientapi.go
@@ -18,9 +18,9 @@ import (
 	"github.com/Shopify/sarama"
 	"github.com/gorilla/mux"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
-	"github.com/matrix-org/dendrite/clientapi/consumers"
 	"github.com/matrix-org/dendrite/clientapi/producers"
 	"github.com/matrix-org/dendrite/clientapi/routing"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
 	"github.com/matrix-org/dendrite/internal/config"
@@ -30,14 +30,12 @@ import (
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
 	"github.com/matrix-org/dendrite/userapi/storage/devices"
 	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/sirupsen/logrus"
 )
 
 // AddPublicRoutes sets up and registers HTTP handlers for the ClientAPI component.
 func AddPublicRoutes(
 	router *mux.Router,
 	cfg *config.Dendrite,
-	consumer sarama.Consumer,
 	producer sarama.SyncProducer,
 	deviceDB devices.Database,
 	accountsDB accounts.Database,
@@ -45,6 +43,7 @@ func AddPublicRoutes(
 	rsAPI roomserverAPI.RoomserverInternalAPI,
 	eduInputAPI eduServerAPI.EDUServerInputAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 	transactionsCache *transactions.Cache,
 	fsAPI federationSenderAPI.FederationSenderInternalAPI,
 	userAPI userapi.UserInternalAPI,
@@ -54,16 +53,9 @@ func AddPublicRoutes(
 		Topic:    string(cfg.Kafka.Topics.OutputClientData),
 	}
 
-	roomEventConsumer := consumers.NewOutputRoomEventConsumer(
-		cfg, consumer, accountsDB, rsAPI,
-	)
-	if err := roomEventConsumer.Start(); err != nil {
-		logrus.WithError(err).Panicf("failed to start room server consumer")
-	}
-
 	routing.Setup(
 		router, cfg, eduInputAPI, rsAPI, asAPI,
 		accountsDB, deviceDB, userAPI, federation,
-		syncProducer, transactionsCache, fsAPI,
+		syncProducer, transactionsCache, fsAPI, stateAPI,
 	)
 }
diff --git a/clientapi/consumers/roomserver.go b/clientapi/consumers/roomserver.go
deleted file mode 100644
index beeda042b..000000000
--- a/clientapi/consumers/roomserver.go
+++ /dev/null
@@ -1,92 +0,0 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package consumers
-
-import (
-	"context"
-	"encoding/json"
-
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/config"
-	"github.com/matrix-org/dendrite/roomserver/api"
-	"github.com/matrix-org/dendrite/userapi/storage/accounts"
-	"github.com/matrix-org/gomatrixserverlib"
-
-	"github.com/Shopify/sarama"
-	log "github.com/sirupsen/logrus"
-)
-
-// OutputRoomEventConsumer consumes events that originated in the room server.
-type OutputRoomEventConsumer struct {
-	rsAPI      api.RoomserverInternalAPI
-	rsConsumer *internal.ContinualConsumer
-	db         accounts.Database
-	serverName string
-}
-
-// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
-func NewOutputRoomEventConsumer(
-	cfg *config.Dendrite,
-	kafkaConsumer sarama.Consumer,
-	store accounts.Database,
-	rsAPI api.RoomserverInternalAPI,
-) *OutputRoomEventConsumer {
-
-	consumer := internal.ContinualConsumer{
-		Topic:          string(cfg.Kafka.Topics.OutputRoomEvent),
-		Consumer:       kafkaConsumer,
-		PartitionStore: store,
-	}
-	s := &OutputRoomEventConsumer{
-		rsConsumer: &consumer,
-		db:         store,
-		rsAPI:      rsAPI,
-		serverName: string(cfg.Matrix.ServerName),
-	}
-	consumer.ProcessMessage = s.onMessage
-
-	return s
-}
-
-// Start consuming from room servers
-func (s *OutputRoomEventConsumer) Start() error {
-	return s.rsConsumer.Start()
-}
-
-// onMessage is called when the sync server receives a new event from the room server output log.
-// It is not safe for this function to be called from multiple goroutines, or else the
-// sync stream position may race and be incorrectly calculated.
-func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
-	// Parse out the event JSON
-	var output api.OutputEvent
-	if err := json.Unmarshal(msg.Value, &output); err != nil {
-		// If the message was invalid, log it and move on to the next message in the stream
-		log.WithError(err).Errorf("roomserver output log: message parse failure")
-		return nil
-	}
-
-	if output.Type != api.OutputTypeNewRoomEvent {
-		log.WithField("type", output.Type).Debug(
-			"roomserver output log: ignoring unknown output type",
-		)
-		return nil
-	}
-
-	return s.db.UpdateMemberships(
-		context.TODO(),
-		gomatrixserverlib.UnwrapEventHeaders(output.NewRoomEvent.AddsState()),
-		output.NewRoomEvent.RemovesStateEventIDs,
-	)
-}
diff --git a/clientapi/routing/memberships.go b/clientapi/routing/memberships.go
index 1c9800b66..9c4cf7497 100644
--- a/clientapi/routing/memberships.go
+++ b/clientapi/routing/memberships.go
@@ -18,9 +18,8 @@ import (
 	"encoding/json"
 	"net/http"
 
-	"github.com/matrix-org/dendrite/userapi/storage/accounts"
-
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/config"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
@@ -95,20 +94,19 @@ func GetMemberships(
 func GetJoinedRooms(
 	req *http.Request,
 	device *userapi.Device,
-	accountsDB accounts.Database,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) util.JSONResponse {
-	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err := stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("gomatrixserverlib.SplitID failed")
-		return jsonerror.InternalServerError()
-	}
-	joinedRooms, err := accountsDB.GetRoomIDsByLocalPart(req.Context(), localpart)
-	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountsDB.GetRoomIDsByLocalPart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}
 	return util.JSONResponse{
 		Code: http.StatusOK,
-		JSON: getJoinedRoomsResponse{joinedRooms},
+		JSON: getJoinedRoomsResponse{res.RoomIDs},
 	}
 }
diff --git a/clientapi/routing/profile.go b/clientapi/routing/profile.go
index 7c2cd19bc..1df4c9b33 100644
--- a/clientapi/routing/profile.go
+++ b/clientapi/routing/profile.go
@@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/config"
 	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/dendrite/roomserver/api"
@@ -93,8 +94,8 @@ func GetAvatarURL(
 // SetAvatarURL implements PUT /profile/{userID}/avatar_url
 // nolint:gocyclo
 func SetAvatarURL(
-	req *http.Request, accountDB accounts.Database, device *userapi.Device,
-	userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
+	req *http.Request, accountDB accounts.Database, stateAPI currentstateAPI.CurrentStateInternalAPI,
+	device *userapi.Device, userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
@@ -139,9 +140,13 @@ func SetAvatarURL(
 		return jsonerror.InternalServerError()
 	}
 
-	memberships, err := accountDB.GetMembershipsByLocalpart(req.Context(), localpart)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err = stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipsByLocalpart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}
 
@@ -152,7 +157,7 @@ func SetAvatarURL(
 	}
 
 	events, err := buildMembershipEvents(
-		req.Context(), memberships, newProfile, userID, cfg, evTime, rsAPI,
+		req.Context(), res.RoomIDs, newProfile, userID, cfg, evTime, rsAPI,
 	)
 	switch e := err.(type) {
 	case nil:
@@ -207,8 +212,8 @@ func GetDisplayName(
 // SetDisplayName implements PUT /profile/{userID}/displayname
 // nolint:gocyclo
 func SetDisplayName(
-	req *http.Request, accountDB accounts.Database, device *userapi.Device,
-	userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
+	req *http.Request, accountDB accounts.Database, stateAPI currentstateAPI.CurrentStateInternalAPI,
+	device *userapi.Device, userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
@@ -253,9 +258,13 @@ func SetDisplayName(
 		return jsonerror.InternalServerError()
 	}
 
-	memberships, err := accountDB.GetMembershipsByLocalpart(req.Context(), localpart)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err = stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipsByLocalpart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}
 
@@ -266,7 +275,7 @@ func SetDisplayName(
 	}
 
 	events, err := buildMembershipEvents(
-		req.Context(), memberships, newProfile, userID, cfg, evTime, rsAPI,
+		req.Context(), res.RoomIDs, newProfile, userID, cfg, evTime, rsAPI,
 	)
 	switch e := err.(type) {
 	case nil:
@@ -335,14 +344,14 @@ func getProfile(
 
 func buildMembershipEvents(
 	ctx context.Context,
-	memberships []authtypes.Membership,
+	roomIDs []string,
 	newProfile authtypes.Profile, userID string, cfg *config.Dendrite,
 	evTime time.Time, rsAPI api.RoomserverInternalAPI,
 ) ([]gomatrixserverlib.HeaderedEvent, error) {
 	evs := []gomatrixserverlib.HeaderedEvent{}
 
-	for _, membership := range memberships {
-		verReq := api.QueryRoomVersionForRoomRequest{RoomID: membership.RoomID}
+	for _, roomID := range roomIDs {
+		verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
 		verRes := api.QueryRoomVersionForRoomResponse{}
 		if err := rsAPI.QueryRoomVersionForRoom(ctx, &verReq, &verRes); err != nil {
 			return []gomatrixserverlib.HeaderedEvent{}, err
@@ -350,7 +359,7 @@ func buildMembershipEvents(
 
 		builder := gomatrixserverlib.EventBuilder{
 			Sender:   userID,
-			RoomID:   membership.RoomID,
+			RoomID:   roomID,
 			Type:     "m.room.member",
 			StateKey: &userID,
 		}
diff --git a/clientapi/routing/routing.go b/clientapi/routing/routing.go
index 9dfff0f20..deaa7b329 100644
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@@ -23,6 +23,7 @@ import (
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/dendrite/clientapi/producers"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
 	"github.com/matrix-org/dendrite/internal/config"
@@ -58,6 +59,7 @@ func Setup(
 	syncProducer *producers.SyncAPIProducer,
 	transactionsCache *transactions.Cache,
 	federationSender federationSenderAPI.FederationSenderInternalAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) {
 
 	publicAPIMux.Handle("/client/versions",
@@ -98,7 +100,7 @@ func Setup(
 	).Methods(http.MethodPost, http.MethodOptions)
 	r0mux.Handle("/joined_rooms",
 		httputil.MakeAuthAPI("joined_rooms", userAPI, func(req *http.Request, device *api.Device) util.JSONResponse {
-			return GetJoinedRooms(req, device, accountDB)
+			return GetJoinedRooms(req, device, stateAPI)
 		}),
 	).Methods(http.MethodGet, http.MethodOptions)
 	r0mux.Handle("/rooms/{roomID}/join",
@@ -307,7 +309,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SendTyping(req, device, vars["roomID"], vars["userID"], accountDB, eduAPI)
+			return SendTyping(req, device, vars["roomID"], vars["userID"], accountDB, eduAPI, stateAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 
@@ -404,7 +406,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SetAvatarURL(req, accountDB, device, vars["userID"], cfg, rsAPI)
+			return SetAvatarURL(req, accountDB, stateAPI, device, vars["userID"], cfg, rsAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 	// Browsers use the OPTIONS HTTP method to check if the CORS policy allows
@@ -426,7 +428,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SetDisplayName(req, accountDB, device, vars["userID"], cfg, rsAPI)
+			return SetDisplayName(req, accountDB, stateAPI, device, vars["userID"], cfg, rsAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 	// Browsers use the OPTIONS HTTP method to check if the CORS policy allows
diff --git a/clientapi/routing/sendtyping.go b/clientapi/routing/sendtyping.go
index 9b6a0b39b..54a822860 100644
--- a/clientapi/routing/sendtyping.go
+++ b/clientapi/routing/sendtyping.go
@@ -13,15 +13,15 @@
 package routing
 
 import (
-	"database/sql"
 	"net/http"
 
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
-	"github.com/matrix-org/dendrite/clientapi/userutil"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/eduserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
+	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 )
 
@@ -36,6 +36,7 @@ func SendTyping(
 	req *http.Request, device *userapi.Device, roomID string,
 	userID string, accountDB accounts.Database,
 	eduAPI api.EDUServerInputAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) util.JSONResponse {
 	if device.UserID != userID {
 		return util.JSONResponse{
@@ -44,23 +45,38 @@ func SendTyping(
 		}
 	}
 
-	localpart, err := userutil.ParseUsernameParam(userID, nil)
+	// Verify that the user is a member of this room
+	tuple := gomatrixserverlib.StateKeyTuple{
+		EventType: gomatrixserverlib.MRoomMember,
+		StateKey:  userID,
+	}
+	var res currentstateAPI.QueryCurrentStateResponse
+	err := stateAPI.QueryCurrentState(req.Context(), &currentstateAPI.QueryCurrentStateRequest{
+		RoomID:      roomID,
+		StateTuples: []gomatrixserverlib.StateKeyTuple{tuple},
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("userutil.ParseUsernameParam failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryCurrentState failed")
 		return jsonerror.InternalServerError()
 	}
-
-	// Verify that the user is a member of this room
-	_, err = accountDB.GetMembershipInRoomByLocalpart(req.Context(), localpart, roomID)
-	if err == sql.ErrNoRows {
+	ev := res.StateEvents[tuple]
+	if ev == nil {
 		return util.JSONResponse{
 			Code: http.StatusForbidden,
 			JSON: jsonerror.Forbidden("User not in this room"),
 		}
-	} else if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipInRoomByLocalPart failed")
+	}
+	membership, err := ev.Membership()
+	if err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("Member event isn't valid")
 		return jsonerror.InternalServerError()
 	}
+	if membership != gomatrixserverlib.Join {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("User not in this room"),
+		}
+	}
 
 	// parse the incoming http request
 	var r typingContentJSON
diff --git a/cmd/dendrite-client-api-server/main.go b/cmd/dendrite-client-api-server/main.go
index fe5f30a0e..f46dae502 100644
--- a/cmd/dendrite-client-api-server/main.go
+++ b/cmd/dendrite-client-api-server/main.go
@@ -35,10 +35,11 @@ func main() {
 	fsAPI := base.FederationSenderHTTPClient()
 	eduInputAPI := base.EDUServerClient()
 	userAPI := base.UserAPIClient()
+	stateAPI := base.CurrentStateAPIClient()
 
 	clientapi.AddPublicRoutes(
-		base.PublicAPIMux, base.Cfg, base.KafkaConsumer, base.KafkaProducer, deviceDB, accountDB, federation,
-		rsAPI, eduInputAPI, asQuery, transactions.New(), fsAPI, userAPI,
+		base.PublicAPIMux, base.Cfg, base.KafkaProducer, deviceDB, accountDB, federation,
+		rsAPI, eduInputAPI, asQuery, stateAPI, transactions.New(), fsAPI, userAPI,
 	)
 
 	base.SetupAndServeHTTP(string(base.Cfg.Bind.ClientAPI), string(base.Cfg.Listen.ClientAPI))
diff --git a/cmd/dendrite-demo-libp2p/main.go b/cmd/dendrite-demo-libp2p/main.go
index 356ab5a7f..b7e86b77c 100644
--- a/cmd/dendrite-demo-libp2p/main.go
+++ b/cmd/dendrite-demo-libp2p/main.go
@@ -30,6 +30,7 @@ import (
 	p2pdisc "github.com/libp2p/go-libp2p/p2p/discovery"
 	"github.com/matrix-org/dendrite/appservice"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-libp2p/storage"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/federationsender"
 	"github.com/matrix-org/dendrite/internal/config"
@@ -166,6 +167,7 @@ func main() {
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}
+	stateAPI := currentstateserver.NewInternalAPI(base.Base.Cfg, base.Base.KafkaConsumer)
 
 	monolith := setup.Monolith{
 		Config:        base.Base.Cfg,
@@ -182,6 +184,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		ServerKeyAPI:        serverKeyAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,
 
 		PublicRoomsDB: publicRoomsDB,
diff --git a/cmd/dendrite-demo-yggdrasil/main.go b/cmd/dendrite-demo-yggdrasil/main.go
index db05ecb76..5de674021 100644
--- a/cmd/dendrite-demo-yggdrasil/main.go
+++ b/cmd/dendrite-demo-yggdrasil/main.go
@@ -27,6 +27,7 @@ import (
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/embed"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/signing"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/yggconn"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@@ -115,6 +116,8 @@ func main() {
 
 	embed.Embed(base.BaseMux, *instancePort, "Yggdrasil Demo")
 
+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@@ -130,6 +133,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		UserAPI:             userAPI,
+		StateAPI:            stateAPI,
 		//ServerKeyAPI:        serverKeyAPI,
 
 		PublicRoomsDB: publicRoomsDB,
diff --git a/cmd/dendrite-monolith-server/main.go b/cmd/dendrite-monolith-server/main.go
index 339bbe699..905eda2ba 100644
--- a/cmd/dendrite-monolith-server/main.go
+++ b/cmd/dendrite-monolith-server/main.go
@@ -20,6 +20,7 @@ import (
 	"os"
 
 	"github.com/matrix-org/dendrite/appservice"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@@ -122,6 +123,8 @@ func main() {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}
 
+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@@ -137,6 +140,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		ServerKeyAPI:        serverKeyAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,
 
 		PublicRoomsDB: publicRoomsDB,
diff --git a/cmd/dendritejs/main.go b/cmd/dendritejs/main.go
index 883b0fad0..11f339b0f 100644
--- a/cmd/dendritejs/main.go
+++ b/cmd/dendritejs/main.go
@@ -22,6 +22,7 @@ import (
 	"syscall/js"
 
 	"github.com/matrix-org/dendrite/appservice"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@@ -218,6 +219,8 @@ func main() {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}
 
+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@@ -232,6 +235,7 @@ func main() {
 		EDUInternalAPI:      eduInputAPI,
 		FederationSenderAPI: fedSenderAPI,
 		RoomserverAPI:       rsAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,
 		//ServerKeyAPI:        serverKeyAPI,
 
diff --git a/currentstateserver/api/api.go b/currentstateserver/api/api.go
index 10433722c..b16306ab0 100644
--- a/currentstateserver/api/api.go
+++ b/currentstateserver/api/api.go
@@ -24,7 +24,21 @@ import (
 )
 
 type CurrentStateInternalAPI interface {
+	// QueryCurrentState retrieves the requested state events. If state events are not found, they will be missing from
+	// the response.
 	QueryCurrentState(ctx context.Context, req *QueryCurrentStateRequest, res *QueryCurrentStateResponse) error
+	// QueryRoomsForUser retrieves a list of room IDs matching the given query.
+	QueryRoomsForUser(ctx context.Context, req *QueryRoomsForUserRequest, res *QueryRoomsForUserResponse) error
+}
+
+type QueryRoomsForUserRequest struct {
+	UserID string
+	// The desired membership of the user. If this is the empty string then no rooms are returned.
+	WantMembership string
+}
+
+type QueryRoomsForUserResponse struct {
+	RoomIDs []string
 }
 
 type QueryCurrentStateRequest struct {
@@ -33,12 +47,12 @@ type QueryCurrentStateRequest struct {
 }
 
 type QueryCurrentStateResponse struct {
-	StateEvents map[gomatrixserverlib.StateKeyTuple]gomatrixserverlib.HeaderedEvent
+	StateEvents map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent
 }
 
 // MarshalJSON stringifies the StateKeyTuple keys so they can be sent over the wire in HTTP API mode.
 func (r *QueryCurrentStateResponse) MarshalJSON() ([]byte, error) {
-	se := make(map[string]gomatrixserverlib.HeaderedEvent, len(r.StateEvents))
+	se := make(map[string]*gomatrixserverlib.HeaderedEvent, len(r.StateEvents))
 	for k, v := range r.StateEvents {
 		// use 0x1F (unit separator) as the delimiter between type/state key,
 		se[fmt.Sprintf("%s\x1F%s", k.EventType, k.StateKey)] = v
@@ -47,12 +61,12 @@ func (r *QueryCurrentStateResponse) MarshalJSON() ([]byte, error) {
 }
 
 func (r *QueryCurrentStateResponse) UnmarshalJSON(data []byte) error {
-	res := make(map[string]gomatrixserverlib.HeaderedEvent)
+	res := make(map[string]*gomatrixserverlib.HeaderedEvent)
 	err := json.Unmarshal(data, &res)
 	if err != nil {
 		return err
 	}
-	r.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]gomatrixserverlib.HeaderedEvent, len(res))
+	r.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent, len(res))
 	for k, v := range res {
 		fields := strings.Split(k, "\x1F")
 		r.StateEvents[gomatrixserverlib.StateKeyTuple{
diff --git a/currentstateserver/currentstateserver_test.go b/currentstateserver/currentstateserver_test.go
index 95ca609b4..a0627fea7 100644
--- a/currentstateserver/currentstateserver_test.go
+++ b/currentstateserver/currentstateserver_test.go
@@ -136,8 +136,8 @@ func TestQueryCurrentState(t *testing.T) {
 				},
 			},
 			wantRes: api.QueryCurrentStateResponse{
-				StateEvents: map[gomatrixserverlib.StateKeyTuple]gomatrixserverlib.HeaderedEvent{
-					plTuple: plEvent,
+				StateEvents: map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent{
+					plTuple: &plEvent,
 				},
 			},
 		},
diff --git a/currentstateserver/internal/api.go b/currentstateserver/internal/api.go
index d83a7a0f9..85fbf51ef 100644
--- a/currentstateserver/internal/api.go
+++ b/currentstateserver/internal/api.go
@@ -27,15 +27,24 @@ type CurrentStateInternalAPI struct {
 }
 
 func (a *CurrentStateInternalAPI) QueryCurrentState(ctx context.Context, req *api.QueryCurrentStateRequest, res *api.QueryCurrentStateResponse) error {
-	res.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]gomatrixserverlib.HeaderedEvent)
+	res.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent)
 	for _, tuple := range req.StateTuples {
 		ev, err := a.DB.GetStateEvent(ctx, req.RoomID, tuple.EventType, tuple.StateKey)
 		if err != nil {
 			return err
 		}
 		if ev != nil {
-			res.StateEvents[tuple] = *ev
+			res.StateEvents[tuple] = ev
 		}
 	}
 	return nil
 }
+
+func (a *CurrentStateInternalAPI) QueryRoomsForUser(ctx context.Context, req *api.QueryRoomsForUserRequest, res *api.QueryRoomsForUserResponse) error {
+	roomIDs, err := a.DB.GetRoomsByMembership(ctx, req.UserID, req.WantMembership)
+	if err != nil {
+		return err
+	}
+	res.RoomIDs = roomIDs
+	return nil
+}
diff --git a/currentstateserver/inthttp/client.go b/currentstateserver/inthttp/client.go
index 2267685a1..6fd9907bd 100644
--- a/currentstateserver/inthttp/client.go
+++ b/currentstateserver/inthttp/client.go
@@ -27,6 +27,7 @@ import (
 // HTTP paths for the internal HTTP APIs
 const (
 	QueryCurrentStatePath = "/currentstateserver/queryCurrentState"
+	QueryRoomsForUserPath = "/currentstateserver/queryRoomsForUser"
 )
 
 // NewCurrentStateAPIClient creates a CurrentStateInternalAPI implemented by talking to a HTTP POST API.
@@ -60,3 +61,15 @@ func (h *httpCurrentStateInternalAPI) QueryCurrentState(
 	apiURL := h.apiURL + QueryCurrentStatePath
 	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
 }
+
+func (h *httpCurrentStateInternalAPI) QueryRoomsForUser(
+	ctx context.Context,
+	request *api.QueryRoomsForUserRequest,
+	response *api.QueryRoomsForUserResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "QueryRoomsForUser")
+	defer span.Finish()
+
+	apiURL := h.apiURL + QueryRoomsForUserPath
+	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}
diff --git a/currentstateserver/inthttp/server.go b/currentstateserver/inthttp/server.go
index 83bac6ebb..fa7ecb22e 100644
--- a/currentstateserver/inthttp/server.go
+++ b/currentstateserver/inthttp/server.go
@@ -38,4 +38,17 @@ func AddRoutes(internalAPIMux *mux.Router, intAPI api.CurrentStateInternalAPI) {
 			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
 		}),
 	)
+	internalAPIMux.Handle(QueryRoomsForUserPath,
+		httputil.MakeInternalAPI("queryRoomsForUser", func(req *http.Request) util.JSONResponse {
+			request := api.QueryRoomsForUserRequest{}
+			response := api.QueryRoomsForUserResponse{}
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.MessageResponse(http.StatusBadRequest, err.Error())
+			}
+			if err := intAPI.QueryRoomsForUser(req.Context(), &request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
+		}),
+	)
 }
diff --git a/currentstateserver/storage/interface.go b/currentstateserver/storage/interface.go
index 488df9e2b..dbf223f33 100644
--- a/currentstateserver/storage/interface.go
+++ b/currentstateserver/storage/interface.go
@@ -29,4 +29,6 @@ type Database interface {
 	// If no event could be found, returns nil
 	// If there was an issue during the retrieval, returns an error
 	GetStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error)
+	// GetRoomsByMembership returns a list of room IDs matching the provided membership and user ID (as state_key).
+	GetRoomsByMembership(ctx context.Context, userID, membership string) ([]string, error)
 }
diff --git a/currentstateserver/storage/postgres/current_room_state_table.go b/currentstateserver/storage/postgres/current_room_state_table.go
index 255be42a6..95621913b 100644
--- a/currentstateserver/storage/postgres/current_room_state_table.go
+++ b/currentstateserver/storage/postgres/current_room_state_table.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"strconv"
 
 	"github.com/lib/pq"
 	"github.com/matrix-org/dendrite/currentstateserver/storage/tables"
@@ -26,7 +27,9 @@ import (
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-const currentRoomStateSchema = `
+var leaveEnum = strconv.Itoa(tables.MembershipToEnum["leave"])
+
+var currentRoomStateSchema = `
 -- Stores the current room state for every room.
 CREATE TABLE IF NOT EXISTS currentstate_current_room_state (
     -- The 'room_id' key for the state event.
@@ -41,22 +44,22 @@ CREATE TABLE IF NOT EXISTS currentstate_current_room_state (
     state_key TEXT NOT NULL,
     -- The JSON for the event. Stored as TEXT because this should be valid UTF-8.
     headered_event_json TEXT NOT NULL,
-    -- The 'content.membership' value if this event is an m.room.member event. For other
-    -- events, this will be NULL.
-    membership TEXT,
+    -- The 'content.membership' enum value if this event is an m.room.member event.
+    membership SMALLINT NOT NULL DEFAULT 0,
     -- Clobber based on 3-uple of room_id, type and state_key
     CONSTRAINT currentstate_current_room_state_unique UNIQUE (room_id, type, state_key)
 );
 -- for event deletion
 CREATE UNIQUE INDEX IF NOT EXISTS currentstate_event_id_idx ON currentstate_current_room_state(event_id, room_id, type, sender);
 -- for querying membership states of users
-CREATE INDEX IF NOT EXISTS currentstate_membership_idx ON currentstate_current_room_state(type, state_key, membership) WHERE membership IS NOT NULL AND membership != 'leave';
+CREATE INDEX IF NOT EXISTS currentstate_membership_idx ON currentstate_current_room_state(type, state_key, membership)
+WHERE membership IS NOT NULL AND membership != ` + leaveEnum + `;
 `
 
 const upsertRoomStateSQL = "" +
 	"INSERT INTO currentstate_current_room_state (room_id, event_id, type, sender, state_key, headered_event_json, membership)" +
 	" VALUES ($1, $2, $3, $4, $5, $6, $7)" +
-	" ON CONFLICT ON CONSTRAINT currentstate_room_state_unique" +
+	" ON CONFLICT ON CONSTRAINT currentstate_current_room_state_unique" +
 	" DO UPDATE SET event_id = $2, sender=$4, headered_event_json = $6, membership = $7"
 
 const deleteRoomStateByEventIDSQL = "" +
@@ -108,10 +111,10 @@ func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(
 	ctx context.Context,
 	txn *sql.Tx,
 	userID string,
-	membership string,
+	membershipEnum int,
 ) ([]string, error) {
 	stmt := sqlutil.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
-	rows, err := stmt.QueryContext(ctx, userID, membership)
+	rows, err := stmt.QueryContext(ctx, userID, membershipEnum)
 	if err != nil {
 		return nil, err
 	}
@@ -138,7 +141,7 @@ func (s *currentRoomStateStatements) DeleteRoomStateByEventID(
 
 func (s *currentRoomStateStatements) UpsertRoomState(
 	ctx context.Context, txn *sql.Tx,
-	event gomatrixserverlib.HeaderedEvent, membership *string,
+	event gomatrixserverlib.HeaderedEvent, membershipEnum int,
 ) error {
 	headeredJSON, err := json.Marshal(event)
 	if err != nil {
@@ -155,7 +158,7 @@ func (s *currentRoomStateStatements) UpsertRoomState(
 		event.Sender(),
 		*event.StateKey(),
 		headeredJSON,
-		membership,
+		membershipEnum,
 	)
 	return err
 }
diff --git a/currentstateserver/storage/shared/storage.go b/currentstateserver/storage/shared/storage.go
index 976190cb8..d78b3e0ed 100644
--- a/currentstateserver/storage/shared/storage.go
+++ b/currentstateserver/storage/shared/storage.go
@@ -17,6 +17,7 @@ package shared
 import (
 	"context"
 	"database/sql"
+	"fmt"
 
 	"github.com/matrix-org/dendrite/currentstateserver/storage/tables"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@@ -47,19 +48,31 @@ func (d *Database) StoreStateEvents(ctx context.Context, addStateEvents []gomatr
 				// ignore non state events
 				continue
 			}
-			var membership *string
+			var membershipEnum int
 			if event.Type() == "m.room.member" {
-				value, err := event.Membership()
+				membership, err := event.Membership()
 				if err != nil {
 					return err
 				}
-				membership = &value
+				enum, ok := tables.MembershipToEnum[membership]
+				if !ok {
+					return fmt.Errorf("unknown membership: %s", membership)
+				}
+				membershipEnum = enum
 			}
 
-			if err := d.CurrentRoomState.UpsertRoomState(ctx, txn, event, membership); err != nil {
+			if err := d.CurrentRoomState.UpsertRoomState(ctx, txn, event, membershipEnum); err != nil {
 				return err
 			}
 		}
 		return nil
 	})
 }
+
+func (d *Database) GetRoomsByMembership(ctx context.Context, userID, membership string) ([]string, error) {
+	enum, ok := tables.MembershipToEnum[membership]
+	if !ok {
+		return nil, fmt.Errorf("unknown membership: %s", membership)
+	}
+	return d.CurrentRoomState.SelectRoomIDsWithMembership(ctx, nil, userID, enum)
+}
diff --git a/currentstateserver/storage/sqlite3/current_room_state_table.go b/currentstateserver/storage/sqlite3/current_room_state_table.go
index c18193276..2e2b0e423 100644
--- a/currentstateserver/storage/sqlite3/current_room_state_table.go
+++ b/currentstateserver/storage/sqlite3/current_room_state_table.go
@@ -35,7 +35,7 @@ CREATE TABLE IF NOT EXISTS currentstate_current_room_state (
     sender TEXT NOT NULL,
     state_key TEXT NOT NULL,
     headered_event_json TEXT NOT NULL,
-    membership TEXT,
+    membership INTEGER NOT NULL DEFAULT 0,
     UNIQUE (room_id, type, state_key)
 );
 -- for event deletion
@@ -100,10 +100,10 @@ func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(
 	ctx context.Context,
 	txn *sql.Tx,
 	userID string,
-	membership string, // nolint: unparam
+	membershipEnum int,
 ) ([]string, error) {
 	stmt := sqlutil.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
-	rows, err := stmt.QueryContext(ctx, userID, membership)
+	rows, err := stmt.QueryContext(ctx, userID, membershipEnum)
 	if err != nil {
 		return nil, err
 	}
@@ -130,7 +130,7 @@ func (s *currentRoomStateStatements) DeleteRoomStateByEventID(
 
 func (s *currentRoomStateStatements) UpsertRoomState(
 	ctx context.Context, txn *sql.Tx,
-	event gomatrixserverlib.HeaderedEvent, membership *string,
+	event gomatrixserverlib.HeaderedEvent, membershipEnum int,
 ) error {
 	headeredJSON, err := json.Marshal(event)
 	if err != nil {
@@ -147,7 +147,7 @@ func (s *currentRoomStateStatements) UpsertRoomState(
 		event.Sender(),
 		*event.StateKey(),
 		headeredJSON,
-		membership,
+		membershipEnum,
 	)
 	return err
 }
diff --git a/currentstateserver/storage/tables/interface.go b/currentstateserver/storage/tables/interface.go
index d2e560a21..f2c8b14ed 100644
--- a/currentstateserver/storage/tables/interface.go
+++ b/currentstateserver/storage/tables/interface.go
@@ -21,11 +21,24 @@ import (
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
+var MembershipToEnum = map[string]int{
+	gomatrixserverlib.Invite: 1,
+	gomatrixserverlib.Join:   2,
+	gomatrixserverlib.Leave:  3,
+	gomatrixserverlib.Ban:    4,
+}
+var EnumToMembership = map[int]string{
+	1: gomatrixserverlib.Invite,
+	2: gomatrixserverlib.Join,
+	3: gomatrixserverlib.Leave,
+	4: gomatrixserverlib.Ban,
+}
+
 type CurrentRoomState interface {
 	SelectStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error)
 	SelectEventsWithEventIDs(ctx context.Context, txn *sql.Tx, eventIDs []string) ([]gomatrixserverlib.HeaderedEvent, error)
-	UpsertRoomState(ctx context.Context, txn *sql.Tx, event gomatrixserverlib.HeaderedEvent, membership *string) error
+	UpsertRoomState(ctx context.Context, txn *sql.Tx, event gomatrixserverlib.HeaderedEvent, membershipEnum int) error
 	DeleteRoomStateByEventID(ctx context.Context, txn *sql.Tx, eventID string) error
 	// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
-	SelectRoomIDsWithMembership(ctx context.Context, txn *sql.Tx, userID string, membership string) ([]string, error)
+	SelectRoomIDsWithMembership(ctx context.Context, txn *sql.Tx, userID string, membershipEnum int) ([]string, error)
 }
diff --git a/internal/setup/base.go b/internal/setup/base.go
index 66424a609..ddf8e0fad 100644
--- a/internal/setup/base.go
+++ b/internal/setup/base.go
@@ -22,6 +22,7 @@ import (
 	"net/url"
 	"time"
 
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/caching"
 	"github.com/matrix-org/dendrite/internal/httputil"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@@ -37,6 +38,7 @@ import (
 
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	asinthttp "github.com/matrix-org/dendrite/appservice/inthttp"
+	currentstateinthttp "github.com/matrix-org/dendrite/currentstateserver/inthttp"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	eduinthttp "github.com/matrix-org/dendrite/eduserver/inthttp"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
@@ -171,6 +173,15 @@ func (b *BaseDendrite) UserAPIClient() userapi.UserInternalAPI {
 	return userAPI
 }
 
+// CurrentStateAPIClient returns CurrentStateInternalAPI for hitting the currentstateserver over HTTP.
+func (b *BaseDendrite) CurrentStateAPIClient() currentstateAPI.CurrentStateInternalAPI {
+	stateAPI, err := currentstateinthttp.NewCurrentStateAPIClient(b.Cfg.CurrentStateAPIURL(), b.httpClient)
+	if err != nil {
+		logrus.WithError(err).Panic("UserAPIClient failed", b.httpClient)
+	}
+	return stateAPI
+}
+
 // EDUServerClient returns EDUServerInputAPI for hitting the EDU server over HTTP
 func (b *BaseDendrite) EDUServerClient() eduServerAPI.EDUServerInputAPI {
 	e, err := eduinthttp.NewEDUServerClient(b.Cfg.EDUServerURL(), b.httpClient)
diff --git a/internal/setup/monolith.go b/internal/setup/monolith.go
index 24bee9502..86275e28d 100644
--- a/internal/setup/monolith.go
+++ b/internal/setup/monolith.go
@@ -19,6 +19,7 @@ import (
 	"github.com/gorilla/mux"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	"github.com/matrix-org/dendrite/federationapi"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
@@ -56,6 +57,7 @@ type Monolith struct {
 	RoomserverAPI       roomserverAPI.RoomserverInternalAPI
 	ServerKeyAPI        serverKeyAPI.ServerKeyInternalAPI
 	UserAPI             userapi.UserInternalAPI
+	StateAPI            currentstateAPI.CurrentStateInternalAPI
 
 	// TODO: can we remove this? It's weird that we are required the database
 	// yet every other component can do that on its own. libp2p-demo uses a custom
@@ -69,9 +71,9 @@ type Monolith struct {
 // AddAllPublicRoutes attaches all public paths to the given router
 func (m *Monolith) AddAllPublicRoutes(publicMux *mux.Router) {
 	clientapi.AddPublicRoutes(
-		publicMux, m.Config, m.KafkaConsumer, m.KafkaProducer, m.DeviceDB, m.AccountDB,
+		publicMux, m.Config, m.KafkaProducer, m.DeviceDB, m.AccountDB,
 		m.FedClient, m.RoomserverAPI,
-		m.EDUInternalAPI, m.AppserviceAPI, transactions.New(),
+		m.EDUInternalAPI, m.AppserviceAPI, m.StateAPI, transactions.New(),
 		m.FederationSenderAPI, m.UserAPI,
 	)
 
diff --git a/userapi/storage/accounts/interface.go b/userapi/storage/accounts/interface.go
index 9ed33e1b9..6f6caf111 100644
--- a/userapi/storage/accounts/interface.go
+++ b/userapi/storage/accounts/interface.go
@@ -22,7 +22,6 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/userapi/api"
-	"github.com/matrix-org/gomatrixserverlib"
 )
 
 type Database interface {
@@ -36,10 +35,6 @@ type Database interface {
 	// account already exists, it will return nil, ErrUserExists.
 	CreateAccount(ctx context.Context, localpart, plaintextPassword, appserviceID string) (*api.Account, error)
 	CreateGuestAccount(ctx context.Context) (*api.Account, error)
-	UpdateMemberships(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string) error
-	GetMembershipInRoomByLocalpart(ctx context.Context, localpart, roomID string) (authtypes.Membership, error)
-	GetRoomIDsByLocalPart(ctx context.Context, localpart string) ([]string, error)
-	GetMembershipsByLocalpart(ctx context.Context, localpart string) (memberships []authtypes.Membership, err error)
 	SaveAccountData(ctx context.Context, localpart, roomID, dataType string, content json.RawMessage) error
 	GetAccountData(ctx context.Context, localpart string) (global map[string]json.RawMessage, rooms map[string]map[string]json.RawMessage, err error)
 	// GetAccountDataByType returns account data matching a given
diff --git a/userapi/storage/accounts/postgres/membership_table.go b/userapi/storage/accounts/postgres/membership_table.go
deleted file mode 100644
index 623530acc..000000000
--- a/userapi/storage/accounts/postgres/membership_table.go
+++ /dev/null
@@ -1,159 +0,0 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package postgres
-
-import (
-	"context"
-	"database/sql"
-
-	"github.com/lib/pq"
-	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
-	"github.com/matrix-org/dendrite/internal"
-)
-
-const membershipSchema = `
--- Stores data about users memberships to rooms.
-CREATE TABLE IF NOT EXISTS account_memberships (
-    -- The Matrix user ID localpart for the member
-    localpart TEXT NOT NULL,
-    -- The room this user is a member of
-    room_id TEXT NOT NULL,
-    -- The ID of the join membership event
-    event_id TEXT NOT NULL,
-
-    -- A user can only be member of a room once
-    PRIMARY KEY (localpart, room_id)
-);
-
--- Use index to process deletion by ID more efficiently
-CREATE UNIQUE INDEX IF NOT EXISTS account_membership_event_id ON account_memberships(event_id);
-`
-
-const insertMembershipSQL = `
-	INSERT INTO account_memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)
-	ON CONFLICT (localpart, room_id) DO UPDATE SET event_id = EXCLUDED.event_id
-`
-
-const selectMembershipsByLocalpartSQL = "" +
-	"SELECT room_id, event_id FROM account_memberships WHERE localpart = $1"
-
-const selectMembershipInRoomByLocalpartSQL = "" +
-	"SELECT event_id FROM account_memberships WHERE localpart = $1 AND room_id = $2"
-
-const selectRoomIDsByLocalPartSQL = "" +
-	"SELECT room_id FROM account_memberships WHERE localpart = $1"
-
-const deleteMembershipsByEventIDsSQL = "" +
-	"DELETE FROM account_memberships WHERE event_id = ANY($1)"
-
-type membershipStatements struct {
-	deleteMembershipsByEventIDsStmt       *sql.Stmt
-	insertMembershipStmt                  *sql.Stmt
-	selectMembershipInRoomByLocalpartStmt *sql.Stmt
-	selectMembershipsByLocalpartStmt      *sql.Stmt
-	selectRoomIDsByLocalPartStmt          *sql.Stmt
-}
-
-func (s *membershipStatements) prepare(db *sql.DB) (err error) {
-	_, err = db.Exec(membershipSchema)
-	if err != nil {
-		return
-	}
-	if s.deleteMembershipsByEventIDsStmt, err = db.Prepare(deleteMembershipsByEventIDsSQL); err != nil {
-		return
-	}
-	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
-		return
-	}
-	if s.selectMembershipInRoomByLocalpartStmt, err = db.Prepare(selectMembershipInRoomByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectRoomIDsByLocalPartStmt, err = db.Prepare(selectRoomIDsByLocalPartSQL); err != nil {
-		return
-	}
-	return
-}
-
-func (s *membershipStatements) insertMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) (err error) {
-	stmt := txn.Stmt(s.insertMembershipStmt)
-	_, err = stmt.ExecContext(ctx, localpart, roomID, eventID)
-	return
-}
-
-func (s *membershipStatements) deleteMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) (err error) {
-	stmt := txn.Stmt(s.deleteMembershipsByEventIDsStmt)
-	_, err = stmt.ExecContext(ctx, pq.StringArray(eventIDs))
-	return
-}
-
-func (s *membershipStatements) selectMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	membership := authtypes.Membership{Localpart: localpart, RoomID: roomID}
-	stmt := s.selectMembershipInRoomByLocalpartStmt
-	err := stmt.QueryRowContext(ctx, localpart, roomID).Scan(&membership.EventID)
-
-	return membership, err
-}
-
-func (s *membershipStatements) selectMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	stmt := s.selectMembershipsByLocalpartStmt
-	rows, err := stmt.QueryContext(ctx, localpart)
-	if err != nil {
-		return
-	}
-
-	memberships = []authtypes.Membership{}
-
-	defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsByLocalpart: rows.close() failed")
-	for rows.Next() {
-		var m authtypes.Membership
-		m.Localpart = localpart
-		if err = rows.Scan(&m.RoomID, &m.EventID); err != nil {
-			return
-		}
-		memberships = append(memberships, m)
-	}
-	return memberships, rows.Err()
-}
-
-func (s *membershipStatements) selectRoomIDsByLocalPart(
-	ctx context.Context, localPart string,
-) ([]string, error) {
-	stmt := s.selectRoomIDsByLocalPartStmt
-	rows, err := stmt.QueryContext(ctx, localPart)
-	if err != nil {
-		return nil, err
-	}
-	roomIDs := []string{}
-	defer rows.Close() // nolint: errcheck
-	for rows.Next() {
-		var roomID string
-		if err = rows.Scan(&roomID); err != nil {
-			return nil, err
-		}
-		roomIDs = append(roomIDs, roomID)
-	}
-	return roomIDs, rows.Err()
-}
diff --git a/userapi/storage/accounts/postgres/storage.go b/userapi/storage/accounts/postgres/storage.go
index f0b11bfdb..c76b92f10 100644
--- a/userapi/storage/accounts/postgres/storage.go
+++ b/userapi/storage/accounts/postgres/storage.go
@@ -37,7 +37,6 @@ type Database struct {
 	sqlutil.PartitionOffsetStatements
 	accounts     accountsStatements
 	profiles     profilesStatements
-	memberships  membershipStatements
 	accountDatas accountDataStatements
 	threepids    threepidStatements
 	serverName   gomatrixserverlib.ServerName
@@ -62,10 +61,6 @@ func NewDatabase(dataSourceName string, dbProperties sqlutil.DbProperties, serve
 	if err = p.prepare(db); err != nil {
 		return nil, err
 	}
-	m := membershipStatements{}
-	if err = m.prepare(db); err != nil {
-		return nil, err
-	}
 	ac := accountDataStatements{}
 	if err = ac.prepare(db); err != nil {
 		return nil, err
@@ -74,7 +69,7 @@ func NewDatabase(dataSourceName string, dbProperties sqlutil.DbProperties, serve
 	if err = t.prepare(db); err != nil {
 		return nil, err
 	}
-	return &Database{db, partitions, a, p, m, ac, t, serverName}, nil
+	return &Database{db, partitions, a, p, ac, t, serverName}, nil
 }
 
 // GetAccountByPassword returns the account associated with the given localpart and password.
@@ -179,112 +174,6 @@ func (d *Database) createAccount(
 	return d.accounts.insertAccount(ctx, txn, localpart, hash, appserviceID)
 }
 
-// SaveMembership saves the user matching a given localpart as a member of a given
-// room. It also stores the ID of the membership event.
-// If a membership already exists between the user and the room, or if the
-// insert fails, returns the SQL error
-func (d *Database) saveMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) error {
-	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
-}
-
-// removeMembershipsByEventIDs removes the memberships corresponding to the
-// `join` membership events IDs in the eventIDs slice.
-// If the removal fails, or if there is no membership to remove, returns an error
-func (d *Database) removeMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) error {
-	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
-}
-
-// UpdateMemberships adds the "join" membership events included in a given state
-// events array, and removes those which ID is included in a given array of events
-// IDs. All of the process is run in a transaction, which commits only once/if every
-// insertion and deletion has been successfully processed.
-// Returns a SQL error if there was an issue with any part of the process
-func (d *Database) UpdateMemberships(
-	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
-) error {
-	return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
-			return err
-		}
-
-		for _, event := range eventsToAdd {
-			if err := d.newMembership(ctx, txn, event); err != nil {
-				return err
-			}
-		}
-
-		return nil
-	})
-}
-
-// GetMembershipInRoomByLocalpart returns the membership for an user
-// matching the given localpart if he is a member of the room matching roomID,
-// if not sql.ErrNoRows is returned.
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
-}
-
-// GetRoomIDsByLocalPart returns an array containing the room ids of all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetRoomIDsByLocalPart(
-	ctx context.Context, localpart string,
-) ([]string, error) {
-	return d.memberships.selectRoomIDsByLocalPart(ctx, localpart)
-}
-
-// GetMembershipsByLocalpart returns an array containing the memberships for all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
-}
-
-// newMembership saves a new membership in the database.
-// If the event isn't a valid m.room.member event with type `join`, does nothing.
-// If an error occurred, returns the SQL error
-func (d *Database) newMembership(
-	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
-) error {
-	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
-		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
-		if err != nil {
-			return err
-		}
-
-		// We only want state events from local users
-		if string(serverName) != string(d.serverName) {
-			return nil
-		}
-
-		eventID := ev.EventID()
-		roomID := ev.RoomID()
-		membership, err := ev.Membership()
-		if err != nil {
-			return err
-		}
-
-		// Only "join" membership events can be considered as new memberships
-		if membership == gomatrixserverlib.Join {
-			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 // SaveAccountData saves new account data for a given user and a given room.
 // If the account data is not specific to a room, the room ID should be an empty string
 // If an account data already exists for a given set (user, room, data type), it will
diff --git a/userapi/storage/accounts/sqlite3/membership_table.go b/userapi/storage/accounts/sqlite3/membership_table.go
deleted file mode 100644
index 67958f27d..000000000
--- a/userapi/storage/accounts/sqlite3/membership_table.go
+++ /dev/null
@@ -1,159 +0,0 @@
-// Copyright 2017 Vector Creations Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package sqlite3
-
-import (
-	"context"
-	"database/sql"
-	"strings"
-
-	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/sqlutil"
-)
-
-const membershipSchema = `
--- Stores data about users memberships to rooms.
-CREATE TABLE IF NOT EXISTS account_memberships (
-    -- The Matrix user ID localpart for the member
-    localpart TEXT NOT NULL,
-    -- The room this user is a member of
-    room_id TEXT NOT NULL,
-    -- The ID of the join membership event
-    event_id TEXT NOT NULL,
-
-    -- A user can only be member of a room once
-    PRIMARY KEY (localpart, room_id),
-
-		UNIQUE (event_id)
-);
-`
-
-const insertMembershipSQL = `
-	INSERT INTO account_memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)
-	ON CONFLICT (localpart, room_id) DO UPDATE SET event_id = EXCLUDED.event_id
-`
-
-const selectMembershipsByLocalpartSQL = "" +
-	"SELECT room_id, event_id FROM account_memberships WHERE localpart = $1"
-
-const selectMembershipInRoomByLocalpartSQL = "" +
-	"SELECT event_id FROM account_memberships WHERE localpart = $1 AND room_id = $2"
-
-const selectRoomIDsByLocalPartSQL = "" +
-	"SELECT room_id FROM account_memberships WHERE localpart = $1"
-
-const deleteMembershipsByEventIDsSQL = "" +
-	"DELETE FROM account_memberships WHERE event_id IN ($1)"
-
-type membershipStatements struct {
-	insertMembershipStmt                  *sql.Stmt
-	selectMembershipInRoomByLocalpartStmt *sql.Stmt
-	selectMembershipsByLocalpartStmt      *sql.Stmt
-	selectRoomIDsByLocalPartStmt          *sql.Stmt
-}
-
-func (s *membershipStatements) prepare(db *sql.DB) (err error) {
-	_, err = db.Exec(membershipSchema)
-	if err != nil {
-		return
-	}
-	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
-		return
-	}
-	if s.selectMembershipInRoomByLocalpartStmt, err = db.Prepare(selectMembershipInRoomByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectRoomIDsByLocalPartStmt, err = db.Prepare(selectRoomIDsByLocalPartSQL); err != nil {
-		return
-	}
-	return
-}
-
-func (s *membershipStatements) insertMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) (err error) {
-	stmt := txn.Stmt(s.insertMembershipStmt)
-	_, err = stmt.ExecContext(ctx, localpart, roomID, eventID)
-	return
-}
-
-func (s *membershipStatements) deleteMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) (err error) {
-	sqlStr := strings.Replace(deleteMembershipsByEventIDsSQL, "($1)", sqlutil.QueryVariadic(len(eventIDs)), 1)
-	iEventIDs := make([]interface{}, len(eventIDs))
-	for i, e := range eventIDs {
-		iEventIDs[i] = e
-	}
-	_, err = txn.ExecContext(ctx, sqlStr, iEventIDs...)
-	return
-}
-
-func (s *membershipStatements) selectMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	membership := authtypes.Membership{Localpart: localpart, RoomID: roomID}
-	stmt := s.selectMembershipInRoomByLocalpartStmt
-	err := stmt.QueryRowContext(ctx, localpart, roomID).Scan(&membership.EventID)
-
-	return membership, err
-}
-
-func (s *membershipStatements) selectMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	stmt := s.selectMembershipsByLocalpartStmt
-	rows, err := stmt.QueryContext(ctx, localpart)
-	if err != nil {
-		return
-	}
-
-	memberships = []authtypes.Membership{}
-
-	defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsByLocalpart: rows.close() failed")
-	for rows.Next() {
-		var m authtypes.Membership
-		m.Localpart = localpart
-		if err := rows.Scan(&m.RoomID, &m.EventID); err != nil {
-			return nil, err
-		}
-		memberships = append(memberships, m)
-	}
-
-	return
-}
-func (s *membershipStatements) selectRoomIDsByLocalPart(
-	ctx context.Context, localPart string,
-) ([]string, error) {
-	stmt := s.selectRoomIDsByLocalPartStmt
-	rows, err := stmt.QueryContext(ctx, localPart)
-	if err != nil {
-		return nil, err
-	}
-	roomIDs := []string{}
-	defer rows.Close() // nolint: errcheck
-	for rows.Next() {
-		var roomID string
-		if err = rows.Scan(&roomID); err != nil {
-			return nil, err
-		}
-		roomIDs = append(roomIDs, roomID)
-	}
-	return roomIDs, rows.Err()
-}
diff --git a/userapi/storage/accounts/sqlite3/storage.go b/userapi/storage/accounts/sqlite3/storage.go
index e965df4f9..72b27c8bf 100644
--- a/userapi/storage/accounts/sqlite3/storage.go
+++ b/userapi/storage/accounts/sqlite3/storage.go
@@ -36,7 +36,6 @@ type Database struct {
 	sqlutil.PartitionOffsetStatements
 	accounts     accountsStatements
 	profiles     profilesStatements
-	memberships  membershipStatements
 	accountDatas accountDataStatements
 	threepids    threepidStatements
 	serverName   gomatrixserverlib.ServerName
@@ -67,10 +66,6 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if err = p.prepare(db); err != nil {
 		return nil, err
 	}
-	m := membershipStatements{}
-	if err = m.prepare(db); err != nil {
-		return nil, err
-	}
 	ac := accountDataStatements{}
 	if err = ac.prepare(db); err != nil {
 		return nil, err
@@ -79,7 +74,7 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if err = t.prepare(db); err != nil {
 		return nil, err
 	}
-	return &Database{db, partitions, a, p, m, ac, t, serverName, sync.Mutex{}}, nil
+	return &Database{db, partitions, a, p, ac, t, serverName, sync.Mutex{}}, nil
 }
 
 // GetAccountByPassword returns the account associated with the given localpart and password.
@@ -193,112 +188,6 @@ func (d *Database) createAccount(
 	return d.accounts.insertAccount(ctx, txn, localpart, hash, appserviceID)
 }
 
-// SaveMembership saves the user matching a given localpart as a member of a given
-// room. It also stores the ID of the membership event.
-// If a membership already exists between the user and the room, or if the
-// insert fails, returns the SQL error
-func (d *Database) saveMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) error {
-	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
-}
-
-// removeMembershipsByEventIDs removes the memberships corresponding to the
-// `join` membership events IDs in the eventIDs slice.
-// If the removal fails, or if there is no membership to remove, returns an error
-func (d *Database) removeMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) error {
-	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
-}
-
-// UpdateMemberships adds the "join" membership events included in a given state
-// events array, and removes those which ID is included in a given array of events
-// IDs. All of the process is run in a transaction, which commits only once/if every
-// insertion and deletion has been successfully processed.
-// Returns a SQL error if there was an issue with any part of the process
-func (d *Database) UpdateMemberships(
-	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
-) error {
-	return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
-			return err
-		}
-
-		for _, event := range eventsToAdd {
-			if err := d.newMembership(ctx, txn, event); err != nil {
-				return err
-			}
-		}
-
-		return nil
-	})
-}
-
-// GetMembershipInRoomByLocalpart returns the membership for an user
-// matching the given localpart if he is a member of the room matching roomID,
-// if not sql.ErrNoRows is returned.
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
-}
-
-// GetMembershipsByLocalpart returns an array containing the memberships for all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
-}
-
-// GetRoomIDsByLocalPart returns an array containing the room ids of all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetRoomIDsByLocalPart(
-	ctx context.Context, localpart string,
-) ([]string, error) {
-	return d.memberships.selectRoomIDsByLocalPart(ctx, localpart)
-}
-
-// newMembership saves a new membership in the database.
-// If the event isn't a valid m.room.member event with type `join`, does nothing.
-// If an error occurred, returns the SQL error
-func (d *Database) newMembership(
-	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
-) error {
-	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
-		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
-		if err != nil {
-			return err
-		}
-
-		// We only want state events from local users
-		if string(serverName) != string(d.serverName) {
-			return nil
-		}
-
-		eventID := ev.EventID()
-		roomID := ev.RoomID()
-		membership, err := ev.Membership()
-		if err != nil {
-			return err
-		}
-
-		// Only "join" membership events can be considered as new memberships
-		if membership == gomatrixserverlib.Join {
-			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 // SaveAccountData saves new account data for a given user and a given room.
 // If the account data is not specific to a room, the room ID should be an empty string
 // If an account data already exists for a given set (user, room, data type), it will