diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 8b6f4db02..000000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-version: 2
-jobs:
-  dendrite:
-    docker:
-      - image: matrixdotorg/sytest-dendrite
-    working_directory: /src
-    steps:
-      - checkout
-
-      # Set up dendrite
-      - run: 
-          name: Build Dendrite
-          command: ./build.sh
-      - run: 
-          name: Copy dummy keys to root
-          command: |
-            mv .circleci/matrix_key.pem .
-            mv .circleci/server.key .
-      - run:
-          name: Run sytest with whitelisted tests
-          command: /dendrite_sytest.sh
-
-      - store_artifacts:
-          path: /logs
-          destination: logs
-      - store_test_results:
-          path: /logs
-workflows:
-  version: 2
-  build:
-    jobs:
-      - dendrite
diff --git a/.circleci/matrix_key.pem b/.circleci/matrix_key.pem
deleted file mode 100644
index 6691c74af..000000000
--- a/.circleci/matrix_key.pem
+++ /dev/null
@@ -1,5 +0,0 @@
------BEGIN MATRIX PRIVATE KEY-----
-Key-ID: ed25519:zXtB
-
-jDyHsx0EXbAfvM32yBEKQfIy1FHrmwtB1uMAbm5INBg=
------END MATRIX PRIVATE KEY-----
diff --git a/.circleci/server.key b/.circleci/server.key
deleted file mode 100644
index a5c485079..000000000
--- a/.circleci/server.key
+++ /dev/null
@@ -1,52 +0,0 @@
------BEGIN PRIVATE KEY-----
-MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQCanRCqP11MLIQh
-nC26+A1oyBsFfH7auZ3pqE/WFDrCCIoc7ek7cF3fZU7q8OYI+Q9L5V8fobuLb6FB
-iXD5zZ6pBAI0VNjAS8yi8VluXIv6pJKsVY3k2hGiU7xRoEhkzckZBaEiruspQbcX
-ziNoWoueVBB1a4Eproqzy225cTcoprHsJIPXj0HpW/jKcmahmlM/OrqRAxTwxpb/
-moI6MWIeN4n7h55N6dU1ScVvBS7gZpZQ28d8akuvG3m8kE8q1OPFYGvrNeowD4sp
-qDPFijhbygwpzDQlAWriPcqV9KhuGRnYRGTGvuluOttmpgNhNFVxVAlwZJuMVAMU
-Jhek66ntKsxWkF5LsO8ls20hmHyyAsL7+rb2ZjuRtEwE8SwOstU2AIIXoSTtqXjX
-zC8Ew0VB9MCInJoJC/+iKTLoDqXRZeDKGFx1A2F3Y+Er+Z41HcwgqKRsPqZ066yR
-6iKAb5rzJutnEARtbSrNipy9nHE5hIgKJzgOnggcegypcAj3nqbfFFCZA2CFNXoG
-XFkmBHEpz38pPLI5z6HpeZRRySoIyahk9IfSwM3aB1aUi//8CcpAodGvYGNQkQ3W
-HkrZmM4MtC25I5RyMpYJQWKFpx1cOVPf2ASqaJ+IX1JJTv9dSdYHY/rxsxaiXiry
-+uI7UITRvUKgAOrExfSAXco73bgUFwIDAQABAoICAQCP9QX7PhxEPH6aPKxnlWYG
-1aozJYOHa6QYVlpfXV6IIyNVZD7w1OLSiaU9IydL23nelKZI8XGJllpyhuHl9Qlx
-HQZga0+VW/4hCM7X7tt2d50JUG9ZUaFxnr2M0swU73X6Ej/B51OVilZLl+dn1kaB
-GIxqh7ovcRA774EuVLei5fJriGQpZH1eJgAznujoNqSkDq5/Lntk48LcIqR2Qly0
-/ck/pTpEGSAnCZUGlbDbxyjWCIxozx/A3rguVb8ghi+9KtXQntZ6AT71fmMV3mgz
-LqC8miFDA1rdY+MoVDAusrhZoPSkCEWYGL0HijNDYlLbvf874rDhq6diL0V8jOAd
-PGOx5BY6VUWbSQAUtKpMuNSL6tidkOACGPwbuH7OIaG+yGZ0/Oiy3fureiAEg5VU
-piyp6F7p1g0vgQEnj4CHiCQlX48bjC/mm8758DeaH8H5T++A8MOgRhgFVb9f01R+
-NMzszMziuVNDYe01cwdY1TXUx5b0o+opsbPm6sNp/7afL9Hou1epP9zQC0I8ulfP
-fgrKTddMwlNjoBuDMQ8GqoK275YU4wtyhUMfjr3xQ0JwP46cZbhhc4nh6qcRSNTf
-yVuKv/pT/bJcSmg5JOCS8qdK0BQhAvUin9HvgSAV9QmZVpxzT/xhqwuRlLDKW+VR
-XyPt996f3L4CTXI9h88AQQKCAQEAycBChu3/ZKl8a90anOlv9PwmaaXfLBKH9Rkw
-aeZrMilxTJAb+LEsmtj35rF5KPeBP6ARpX5gmvKJVzCDHT9YgNs+6C3E+l2f1/3a
-TcjZKPTukT2gJdCgejhEgTzAwEse322GSptuyidtNpY7NgbAxP4VdDMOmPYbzufb
-5BqxmfiGsfXgdvQkj8/MzHuGhhft4SU6ED/Ax+EPUWVV7kBr2995kGDF5z5CuJkb
-SJjmVxAJZP/kC2Z/iPnP51G0hiCxHp7+gPY4mvvkHvhJGnGH/vutjRjoe28BENlP
-MgB68S1/U3NGSUzWv86pT1OdHd+qynWj/NzF7Gp/T/ju8VZBXwKCAQEAxDAMSOfF
-dizsU7cJbf6vxi6XJHjhwWUWD2vMznKz1D4mkByeY8aSOc8kQZsE5nd4ZgwkYTaZ
-gItjGjM5y5dpKurfKdqQ+dA6PS03h3p+tp1lZp9/dI9X/DfkTO/LUdrfkVVcbQhE
-zqc6C35qO98rhJdsRwhOF28mOc/4bbs0XjC5dEoBGyFt7Fbn2mYoCo4FSHl7WIq6
-TZR9pLAvxjqEZ6Dwrzpp9wtdLIQYPga+KVKcDT/DStThXDTCNt5PyDE9c8eImFww
-u0T87Er5hSEQgodURxDOZh+9ktIfXzMtxiAJ3iDCEPc3NNnLCWfKMhwGsVTCCXj6
-WuHTOe79tOaQSQKCAQEAqBN52PsRl4TzWNEcyLhZQxmFzuIXKJpPlctkX/VMPL/1
-2bj89JR1+pLjA9e6fnyjuqPZz6uXQ77m2DJcKNOLId6Fa9wljAbPkZu0cLTw5YQX
-8/wJHTfPWcLin2BDnG94yt5t0F3pUJTEEYPa1EmP8w1SRjn64Ue3JwpWUJREfWdk
-n4GdfLwscXrGvVvzWGc7ECR5WOwj6OEAZ+kqS5BzyvtERRm6BcoCv9Mdvb9Tthhw
-Gypri2vat/yWTbnt0QgPRtliYYG+6q8K/xoNnPAUQkLd9PxZQevaUXUY2yk3QxGK
-T7VrSsmu5qB+wM2ByU9686xJ7/DlGu4mHjPerEQVtQKCAQBcM3iSitpyP4qRjWQR
-HbDeIudFbMosaaWEedU28REynkLhV5HYsmnmYUNY0dHrvhoHW419YnuhveBFX+25
-kN8MHHXk5aNcxE+akLWYJimHCVGueScdUIC5OEtDHS8guQx48PUPCOPNeyn8XNzw
-ZmG9Xqy0dWK+AK6mXOcUKvbhjWSbEmySo5NVj0JHkdsfmr9A4Fbntcr4yuCBlYve
-TYIMccark3hZci3HzgzWmbSlFv3f/Cd787A19VWRE8nK+9k1oIDBmhIM8M8s/c9m
-kbOApLkm7O8Tb7dYWQgFZbgNdOEuU5bhAk4fuHuDYBPWmPVMQdkvOnvuWlM61ubF
-LdaBAoIBACDpbb5AQIYsWWOnoXuuGh+YY4kmnaBFpsbgEYkZSy92AaLr4Ibf49WN
-oqNDX73YaJlURaGPYMC9J2Huq7TZcewH3SwkVA3N5UmDoijkM4juRfADAfVIMxB5
-+9paWeEfnYC/o377FTJIJ9hHJWIaWSoiJZLYDBmoYdxmk8DSHAJCeWsjYDzPybsH
-7RyMPIa1u7lVdgOPEOBi1OIg7ASLxGKiHQtrYHq99GcaVvU/UxoNRMcSnPfY3G8R
-pGah+EndSCb2F20ouDyvlKfOylAltH2BeNc3B4PeP7ZhlVr7bfyOAfC2Z7FNDm3J
-+yaBExKfroZjsksctNAcAbgpuvhLLG8=
------END PRIVATE KEY-----
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index dc962fee7..fa815f15b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -25,7 +25,9 @@ run](scripts/build-test-lint.sh).
 When a Pull Request is submitted, continuous integration jobs are run
 automatically to ensure the code builds and is relatively well-written. Checks
 are run on [Buildkite](https://buildkite.com/matrix-dot-org/dendrite/) and
-[CircleCI](https://circleci.com/gh/matrix-org/dendrite/).
+[CircleCI](https://circleci.com/gh/matrix-org/dendrite/). The Buildkite
+pipeline can be found in Matrix.org's [pipelines
+repository](https://github.com/matrix-org/pipelines).
 
 If a job fails, click the "details" button and you should be taken to the job's
 logs.
diff --git a/clientapi/auth/storage/accounts/account_data_table.go b/clientapi/auth/storage/accounts/account_data_table.go
index 0d73cb312..0d6ad0933 100644
--- a/clientapi/auth/storage/accounts/account_data_table.go
+++ b/clientapi/auth/storage/accounts/account_data_table.go
@@ -120,28 +120,17 @@ func (s *accountDataStatements) selectAccountData(
 
 func (s *accountDataStatements) selectAccountDataByType(
 	ctx context.Context, localpart, roomID, dataType string,
-) (data []gomatrixserverlib.ClientEvent, err error) {
-	data = []gomatrixserverlib.ClientEvent{}
-
+) (data *gomatrixserverlib.ClientEvent, err error) {
 	stmt := s.selectAccountDataByTypeStmt
-	rows, err := stmt.QueryContext(ctx, localpart, roomID, dataType)
-	if err != nil {
+	var content []byte
+
+	if err = stmt.QueryRowContext(ctx, localpart, roomID, dataType).Scan(&content); err != nil {
 		return
 	}
 
-	for rows.Next() {
-		var content []byte
-
-		if err = rows.Scan(&content); err != nil {
-			return
-		}
-
-		ac := gomatrixserverlib.ClientEvent{
-			Type:    dataType,
-			Content: content,
-		}
-
-		data = append(data, ac)
+	data = &gomatrixserverlib.ClientEvent{
+		Type:    dataType,
+		Content: content,
 	}
 
 	return
diff --git a/clientapi/auth/storage/accounts/storage.go b/clientapi/auth/storage/accounts/storage.go
index 41d75daad..020a38376 100644
--- a/clientapi/auth/storage/accounts/storage.go
+++ b/clientapi/auth/storage/accounts/storage.go
@@ -263,11 +263,11 @@ func (d *Database) GetAccountData(ctx context.Context, localpart string) (
 
 // GetAccountDataByType returns account data matching a given
 // localpart, room ID and type.
-// If no account data could be found, returns an empty array
+// If no account data could be found, returns nil
 // Returns an error if there was an issue with the retrieval
 func (d *Database) GetAccountDataByType(
 	ctx context.Context, localpart, roomID, dataType string,
-) (data []gomatrixserverlib.ClientEvent, err error) {
+) (data *gomatrixserverlib.ClientEvent, err error) {
 	return d.accountDatas.selectAccountDataByType(
 		ctx, localpart, roomID, dataType,
 	)
diff --git a/clientapi/routing/room_tagging.go b/clientapi/routing/room_tagging.go
index 6e7324cd8..487081c53 100644
--- a/clientapi/routing/room_tagging.go
+++ b/clientapi/routing/room_tagging.go
@@ -59,7 +59,7 @@ func GetTags(
 		return httputil.LogThenError(req, err)
 	}
 
-	if len(data) == 0 {
+	if data == nil {
 		return util.JSONResponse{
 			Code: http.StatusOK,
 			JSON: struct{}{},
@@ -68,7 +68,7 @@ func GetTags(
 
 	return util.JSONResponse{
 		Code: http.StatusOK,
-		JSON: data[0].Content,
+		JSON: data.Content,
 	}
 }
 
@@ -103,8 +103,8 @@ func PutTag(
 	}
 
 	var tagContent gomatrix.TagContent
-	if len(data) > 0 {
-		if err = json.Unmarshal(data[0].Content, &tagContent); err != nil {
+	if data != nil {
+		if err = json.Unmarshal(data.Content, &tagContent); err != nil {
 			return httputil.LogThenError(req, err)
 		}
 	} else {
@@ -155,7 +155,7 @@ func DeleteTag(
 	}
 
 	// If there are no tags in the database, exit
-	if len(data) == 0 {
+	if data == nil {
 		// Spec only defines 200 responses for this endpoint so we don't return anything else.
 		return util.JSONResponse{
 			Code: http.StatusOK,
@@ -164,7 +164,7 @@ func DeleteTag(
 	}
 
 	var tagContent gomatrix.TagContent
-	err = json.Unmarshal(data[0].Content, &tagContent)
+	err = json.Unmarshal(data.Content, &tagContent)
 	if err != nil {
 		return httputil.LogThenError(req, err)
 	}
@@ -204,7 +204,7 @@ func obtainSavedTags(
 	userID string,
 	roomID string,
 	accountDB *accounts.Database,
-) (string, []gomatrixserverlib.ClientEvent, error) {
+) (string, *gomatrixserverlib.ClientEvent, error) {
 	localpart, _, err := gomatrixserverlib.SplitID('@', userID)
 	if err != nil {
 		return "", nil, err
diff --git a/syncapi/sync/requestpool.go b/syncapi/sync/requestpool.go
index 6b95f4698..94a369001 100644
--- a/syncapi/sync/requestpool.go
+++ b/syncapi/sync/requestpool.go
@@ -196,13 +196,13 @@ func (rp *RequestPool) appendAccountData(
 		events := []gomatrixserverlib.ClientEvent{}
 		// Request the missing data from the database
 		for _, dataType := range dataTypes {
-			evs, err := rp.accountDB.GetAccountDataByType(
+			event, err := rp.accountDB.GetAccountDataByType(
 				req.ctx, localpart, roomID, dataType,
 			)
 			if err != nil {
 				return nil, err
 			}
-			events = append(events, evs...)
+			events = append(events, *event)
 		}
 
 		// Append the data to the response
diff --git a/testfile b/testfile
index 963c1f7ce..5ad3426e9 100644
--- a/testfile
+++ b/testfile
@@ -171,6 +171,7 @@ Outbound federation can query profile data
 /event/ on joined room works
 /event/ does not allow access to events before the user joined
 Federation key API allows unsigned requests for keys
+Can paginate public room list
 GET /directory/room/:room_alias yields room ID
 PUT /directory/room/:room_alias creates alias
 Room aliases can contain Unicode