diff --git a/appservice/consumers/roomserver.go b/appservice/consumers/roomserver.go
index b9a567954..6d3ea808f 100644
--- a/appservice/consumers/roomserver.go
+++ b/appservice/consumers/roomserver.go
@@ -34,7 +34,7 @@ import (
 type OutputRoomEventConsumer struct {
 	roomServerConsumer *common.ContinualConsumer
 	db                 accounts.Database
-	asDB               *storage.Database
+	asDB               storage.Database
 	query              api.RoomserverQueryAPI
 	alias              api.RoomserverAliasAPI
 	serverName         string
@@ -47,7 +47,7 @@ func NewOutputRoomEventConsumer(
 	cfg *config.Dendrite,
 	kafkaConsumer sarama.Consumer,
 	store accounts.Database,
-	appserviceDB *storage.Database,
+	appserviceDB storage.Database,
 	queryAPI api.RoomserverQueryAPI,
 	aliasAPI api.RoomserverAliasAPI,
 	workerStates []types.ApplicationServiceWorkerState,
diff --git a/appservice/storage/appservice_events_table.go b/appservice/storage/postgres/appservice_events_table.go
similarity index 99%
rename from appservice/storage/appservice_events_table.go
rename to appservice/storage/postgres/appservice_events_table.go
index 285bbf483..d72faeeae 100644
--- a/appservice/storage/appservice_events_table.go
+++ b/appservice/storage/postgres/appservice_events_table.go
@@ -1,4 +1,5 @@
 // Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/appservice/storage/postgres/storage.go b/appservice/storage/postgres/storage.go
new file mode 100644
index 000000000..c47564689
--- /dev/null
+++ b/appservice/storage/postgres/storage.go
@@ -0,0 +1,111 @@
+// Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+
+	// Import postgres database driver
+	_ "github.com/lib/pq"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// Database stores events intended to be later sent to application services
+type Database struct {
+	events eventsStatements
+	txnID  txnStatements
+	db     *sql.DB
+}
+
+// NewDatabase opens a new database
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var result Database
+	var err error
+	if result.db, err = sql.Open("postgres", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = result.prepare(); err != nil {
+		return nil, err
+	}
+	return &result, nil
+}
+
+func (d *Database) prepare() error {
+	if err := d.events.prepare(d.db); err != nil {
+		return err
+	}
+
+	return d.txnID.prepare(d.db)
+}
+
+// StoreEvent takes in a gomatrixserverlib.Event and stores it in the database
+// for a transaction worker to pull and later send to an application service.
+func (d *Database) StoreEvent(
+	ctx context.Context,
+	appServiceID string,
+	event *gomatrixserverlib.Event,
+) error {
+	return d.events.insertEvent(ctx, appServiceID, event)
+}
+
+// GetEventsWithAppServiceID returns a slice of events and their IDs intended to
+// be sent to an application service given its ID.
+func (d *Database) GetEventsWithAppServiceID(
+	ctx context.Context,
+	appServiceID string,
+	limit int,
+) (int, int, []gomatrixserverlib.Event, bool, error) {
+	return d.events.selectEventsByApplicationServiceID(ctx, appServiceID, limit)
+}
+
+// CountEventsWithAppServiceID returns the number of events destined for an
+// application service given its ID.
+func (d *Database) CountEventsWithAppServiceID(
+	ctx context.Context,
+	appServiceID string,
+) (int, error) {
+	return d.events.countEventsByApplicationServiceID(ctx, appServiceID)
+}
+
+// UpdateTxnIDForEvents takes in an application service ID and a
+// and stores them in the DB, unless the pair already exists, in
+// which case it updates them.
+func (d *Database) UpdateTxnIDForEvents(
+	ctx context.Context,
+	appserviceID string,
+	maxID, txnID int,
+) error {
+	return d.events.updateTxnIDForEvents(ctx, appserviceID, maxID, txnID)
+}
+
+// RemoveEventsBeforeAndIncludingID removes all events from the database that
+// are less than or equal to a given maximum ID. IDs here are implemented as a
+// serial, thus this should always delete events in chronological order.
+func (d *Database) RemoveEventsBeforeAndIncludingID(
+	ctx context.Context,
+	appserviceID string,
+	eventTableID int,
+) error {
+	return d.events.deleteEventsBeforeAndIncludingID(ctx, appserviceID, eventTableID)
+}
+
+// GetLatestTxnID returns the latest available transaction id
+func (d *Database) GetLatestTxnID(
+	ctx context.Context,
+) (int, error) {
+	return d.txnID.selectTxnID(ctx)
+}
diff --git a/appservice/storage/txn_id_counter_table.go b/appservice/storage/postgres/txn_id_counter_table.go
similarity index 94%
rename from appservice/storage/txn_id_counter_table.go
rename to appservice/storage/postgres/txn_id_counter_table.go
index 7b0fa3786..a96a0e360 100644
--- a/appservice/storage/txn_id_counter_table.go
+++ b/appservice/storage/postgres/txn_id_counter_table.go
@@ -1,4 +1,5 @@
 // Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,7 +13,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package storage
+package postgres
 
 import (
 	"context"
diff --git a/appservice/storage/sqlite3/appservice_events_table.go b/appservice/storage/sqlite3/appservice_events_table.go
new file mode 100644
index 000000000..846f09f7f
--- /dev/null
+++ b/appservice/storage/sqlite3/appservice_events_table.go
@@ -0,0 +1,249 @@
+// Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+	"encoding/json"
+	"time"
+
+	"github.com/matrix-org/gomatrixserverlib"
+	log "github.com/sirupsen/logrus"
+)
+
+const appserviceEventsSchema = `
+-- Stores events to be sent to application services
+CREATE TABLE IF NOT EXISTS appservice_events (
+	-- An auto-incrementing id unique to each event in the table
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	-- The ID of the application service the event will be sent to
+	as_id TEXT NOT NULL,
+	-- JSON representation of the event
+	event_json TEXT NOT NULL,
+	-- The ID of the transaction that this event is a part of
+	txn_id INTEGER NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS appservice_events_as_id ON appservice_events(as_id);
+`
+
+const selectEventsByApplicationServiceIDSQL = "" +
+	"SELECT id, event_json, txn_id " +
+	"FROM appservice_events WHERE as_id = $1 ORDER BY txn_id DESC, id ASC"
+
+const countEventsByApplicationServiceIDSQL = "" +
+	"SELECT COUNT(id) FROM appservice_events WHERE as_id = $1"
+
+const insertEventSQL = "" +
+	"INSERT INTO appservice_events(as_id, event_json, txn_id) " +
+	"VALUES ($1, $2, $3)"
+
+const updateTxnIDForEventsSQL = "" +
+	"UPDATE appservice_events SET txn_id = $1 WHERE as_id = $2 AND id <= $3"
+
+const deleteEventsBeforeAndIncludingIDSQL = "" +
+	"DELETE FROM appservice_events WHERE as_id = $1 AND id <= $2"
+
+const (
+	// A transaction ID number that no transaction should ever have. Used for
+	// checking again the default value.
+	invalidTxnID = -2
+)
+
+type eventsStatements struct {
+	selectEventsByApplicationServiceIDStmt *sql.Stmt
+	countEventsByApplicationServiceIDStmt  *sql.Stmt
+	insertEventStmt                        *sql.Stmt
+	updateTxnIDForEventsStmt               *sql.Stmt
+	deleteEventsBeforeAndIncludingIDStmt   *sql.Stmt
+}
+
+func (s *eventsStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(appserviceEventsSchema)
+	if err != nil {
+		return
+	}
+
+	if s.selectEventsByApplicationServiceIDStmt, err = db.Prepare(selectEventsByApplicationServiceIDSQL); err != nil {
+		return
+	}
+	if s.countEventsByApplicationServiceIDStmt, err = db.Prepare(countEventsByApplicationServiceIDSQL); err != nil {
+		return
+	}
+	if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
+		return
+	}
+	if s.updateTxnIDForEventsStmt, err = db.Prepare(updateTxnIDForEventsSQL); err != nil {
+		return
+	}
+	if s.deleteEventsBeforeAndIncludingIDStmt, err = db.Prepare(deleteEventsBeforeAndIncludingIDSQL); err != nil {
+		return
+	}
+
+	return
+}
+
+// selectEventsByApplicationServiceID takes in an application service ID and
+// returns a slice of events that need to be sent to that application service,
+// as well as an int later used to remove these same events from the database
+// once successfully sent to an application service.
+func (s *eventsStatements) selectEventsByApplicationServiceID(
+	ctx context.Context,
+	applicationServiceID string,
+	limit int,
+) (
+	txnID, maxID int,
+	events []gomatrixserverlib.Event,
+	eventsRemaining bool,
+	err error,
+) {
+	// Retrieve events from the database. Unsuccessfully sent events first
+	eventRows, err := s.selectEventsByApplicationServiceIDStmt.QueryContext(ctx, applicationServiceID)
+	if err != nil {
+		return
+	}
+	defer func() {
+		err = eventRows.Close()
+		if err != nil {
+			log.WithFields(log.Fields{
+				"appservice": applicationServiceID,
+			}).WithError(err).Fatalf("appservice unable to select new events to send")
+		}
+	}()
+	events, maxID, txnID, eventsRemaining, err = retrieveEvents(eventRows, limit)
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+func retrieveEvents(eventRows *sql.Rows, limit int) (events []gomatrixserverlib.Event, maxID, txnID int, eventsRemaining bool, err error) {
+	// Get current time for use in calculating event age
+	nowMilli := time.Now().UnixNano() / int64(time.Millisecond)
+
+	// Iterate through each row and store event contents
+	// If txn_id changes dramatically, we've switched from collecting old events to
+	// new ones. Send back those events first.
+	lastTxnID := invalidTxnID
+	for eventsProcessed := 0; eventRows.Next(); {
+		var event gomatrixserverlib.Event
+		var eventJSON []byte
+		var id int
+		err = eventRows.Scan(
+			&id,
+			&eventJSON,
+			&txnID,
+		)
+		if err != nil {
+			return nil, 0, 0, false, err
+		}
+
+		// Unmarshal eventJSON
+		if err = json.Unmarshal(eventJSON, &event); err != nil {
+			return nil, 0, 0, false, err
+		}
+
+		// If txnID has changed on this event from the previous event, then we've
+		// reached the end of a transaction's events. Return only those events.
+		if lastTxnID > invalidTxnID && lastTxnID != txnID {
+			return events, maxID, lastTxnID, true, nil
+		}
+		lastTxnID = txnID
+
+		// Limit events that aren't part of an old transaction
+		if txnID == -1 {
+			// Return if we've hit the limit
+			if eventsProcessed++; eventsProcessed > limit {
+				return events, maxID, lastTxnID, true, nil
+			}
+		}
+
+		if id > maxID {
+			maxID = id
+		}
+
+		// Portion of the event that is unsigned due to rapid change
+		// TODO: Consider removing age as not many app services use it
+		if err = event.SetUnsignedField("age", nowMilli-int64(event.OriginServerTS())); err != nil {
+			return nil, 0, 0, false, err
+		}
+
+		events = append(events, event)
+	}
+
+	return
+}
+
+// countEventsByApplicationServiceID inserts an event mapped to its corresponding application service
+// IDs into the db.
+func (s *eventsStatements) countEventsByApplicationServiceID(
+	ctx context.Context,
+	appServiceID string,
+) (int, error) {
+	var count int
+	err := s.countEventsByApplicationServiceIDStmt.QueryRowContext(ctx, appServiceID).Scan(&count)
+	if err != nil && err != sql.ErrNoRows {
+		return 0, err
+	}
+
+	return count, nil
+}
+
+// insertEvent inserts an event mapped to its corresponding application service
+// IDs into the db.
+func (s *eventsStatements) insertEvent(
+	ctx context.Context,
+	appServiceID string,
+	event *gomatrixserverlib.Event,
+) (err error) {
+	// Convert event to JSON before inserting
+	eventJSON, err := json.Marshal(event)
+	if err != nil {
+		return err
+	}
+
+	_, err = s.insertEventStmt.ExecContext(
+		ctx,
+		appServiceID,
+		eventJSON,
+		-1, // No transaction ID yet
+	)
+	return
+}
+
+// updateTxnIDForEvents sets the transactionID for a collection of events. Done
+// before sending them to an AppService. Referenced before sending to make sure
+// we aren't constructing multiple transactions with the same events.
+func (s *eventsStatements) updateTxnIDForEvents(
+	ctx context.Context,
+	appserviceID string,
+	maxID, txnID int,
+) (err error) {
+	_, err = s.updateTxnIDForEventsStmt.ExecContext(ctx, txnID, appserviceID, maxID)
+	return
+}
+
+// deleteEventsBeforeAndIncludingID removes events matching given IDs from the database.
+func (s *eventsStatements) deleteEventsBeforeAndIncludingID(
+	ctx context.Context,
+	appserviceID string,
+	eventTableID int,
+) (err error) {
+	_, err = s.deleteEventsBeforeAndIncludingIDStmt.ExecContext(ctx, appserviceID, eventTableID)
+	return
+}
diff --git a/appservice/storage/sqlite3/storage.go b/appservice/storage/sqlite3/storage.go
new file mode 100644
index 000000000..56ab55f2f
--- /dev/null
+++ b/appservice/storage/sqlite3/storage.go
@@ -0,0 +1,111 @@
+// Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+
+	// Import SQLite database driver
+	"github.com/matrix-org/gomatrixserverlib"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// Database stores events intended to be later sent to application services
+type Database struct {
+	events eventsStatements
+	txnID  txnStatements
+	db     *sql.DB
+}
+
+// NewDatabase opens a new database
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var result Database
+	var err error
+	if result.db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = result.prepare(); err != nil {
+		return nil, err
+	}
+	return &result, nil
+}
+
+func (d *Database) prepare() error {
+	if err := d.events.prepare(d.db); err != nil {
+		return err
+	}
+
+	return d.txnID.prepare(d.db)
+}
+
+// StoreEvent takes in a gomatrixserverlib.Event and stores it in the database
+// for a transaction worker to pull and later send to an application service.
+func (d *Database) StoreEvent(
+	ctx context.Context,
+	appServiceID string,
+	event *gomatrixserverlib.Event,
+) error {
+	return d.events.insertEvent(ctx, appServiceID, event)
+}
+
+// GetEventsWithAppServiceID returns a slice of events and their IDs intended to
+// be sent to an application service given its ID.
+func (d *Database) GetEventsWithAppServiceID(
+	ctx context.Context,
+	appServiceID string,
+	limit int,
+) (int, int, []gomatrixserverlib.Event, bool, error) {
+	return d.events.selectEventsByApplicationServiceID(ctx, appServiceID, limit)
+}
+
+// CountEventsWithAppServiceID returns the number of events destined for an
+// application service given its ID.
+func (d *Database) CountEventsWithAppServiceID(
+	ctx context.Context,
+	appServiceID string,
+) (int, error) {
+	return d.events.countEventsByApplicationServiceID(ctx, appServiceID)
+}
+
+// UpdateTxnIDForEvents takes in an application service ID and a
+// and stores them in the DB, unless the pair already exists, in
+// which case it updates them.
+func (d *Database) UpdateTxnIDForEvents(
+	ctx context.Context,
+	appserviceID string,
+	maxID, txnID int,
+) error {
+	return d.events.updateTxnIDForEvents(ctx, appserviceID, maxID, txnID)
+}
+
+// RemoveEventsBeforeAndIncludingID removes all events from the database that
+// are less than or equal to a given maximum ID. IDs here are implemented as a
+// serial, thus this should always delete events in chronological order.
+func (d *Database) RemoveEventsBeforeAndIncludingID(
+	ctx context.Context,
+	appserviceID string,
+	eventTableID int,
+) error {
+	return d.events.deleteEventsBeforeAndIncludingID(ctx, appserviceID, eventTableID)
+}
+
+// GetLatestTxnID returns the latest available transaction id
+func (d *Database) GetLatestTxnID(
+	ctx context.Context,
+) (int, error) {
+	return d.txnID.selectTxnID(ctx)
+}
diff --git a/appservice/storage/sqlite3/txn_id_counter_table.go b/appservice/storage/sqlite3/txn_id_counter_table.go
new file mode 100644
index 000000000..b1ee60766
--- /dev/null
+++ b/appservice/storage/sqlite3/txn_id_counter_table.go
@@ -0,0 +1,60 @@
+// Copyright 2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+)
+
+const txnIDSchema = `
+-- Keeps a count of the current transaction ID
+CREATE TABLE IF NOT EXISTS appservice_counters (
+  name TEXT PRIMARY KEY NOT NULL,
+  last_id INTEGER DEFAULT 1
+);
+INSERT OR IGNORE INTO appservice_counters (name, last_id) VALUES('txn_id', 1);
+`
+
+const selectTxnIDSQL = `
+  SELECT last_id FROM appservice_counters WHERE name='txn_id';
+  UPDATE appservice_counters SET last_id=last_id+1 WHERE name='txn_id';
+`
+
+type txnStatements struct {
+	selectTxnIDStmt *sql.Stmt
+}
+
+func (s *txnStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(txnIDSchema)
+	if err != nil {
+		return
+	}
+
+	if s.selectTxnIDStmt, err = db.Prepare(selectTxnIDSQL); err != nil {
+		return
+	}
+
+	return
+}
+
+// selectTxnID selects the latest ascending transaction ID
+func (s *txnStatements) selectTxnID(
+	ctx context.Context,
+) (txnID int, err error) {
+	err = s.selectTxnIDStmt.QueryRowContext(ctx).Scan(&txnID)
+	return
+}
diff --git a/appservice/storage/storage.go b/appservice/storage/storage.go
index b68989fb1..ce3776bc3 100644
--- a/appservice/storage/storage.go
+++ b/appservice/storage/storage.go
@@ -1,4 +1,4 @@
-// Copyright 2018 New Vector Ltd
+// Copyright 2020 The Matrix.org Foundation C.I.C.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,95 +16,33 @@ package storage
 
 import (
 	"context"
-	"database/sql"
+	"net/url"
 
-	// Import postgres database driver
-	_ "github.com/lib/pq"
+	"github.com/matrix-org/dendrite/appservice/storage/postgres"
+	"github.com/matrix-org/dendrite/appservice/storage/sqlite3"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
-// Database stores events intended to be later sent to application services
-type Database struct {
-	events eventsStatements
-	txnID  txnStatements
-	db     *sql.DB
+type Database interface {
+	StoreEvent(ctx context.Context, appServiceID string, event *gomatrixserverlib.Event) error
+	GetEventsWithAppServiceID(ctx context.Context, appServiceID string, limit int) (int, int, []gomatrixserverlib.Event, bool, error)
+	CountEventsWithAppServiceID(ctx context.Context, appServiceID string) (int, error)
+	UpdateTxnIDForEvents(ctx context.Context, appserviceID string, maxID, txnID int) error
+	RemoveEventsBeforeAndIncludingID(ctx context.Context, appserviceID string, eventTableID int) error
+	GetLatestTxnID(ctx context.Context) (int, error)
 }
 
-// NewDatabase opens a new database
-func NewDatabase(dataSourceName string) (*Database, error) {
-	var result Database
-	var err error
-	if result.db, err = sql.Open("postgres", dataSourceName); err != nil {
-		return nil, err
+func NewDatabase(dataSourceName string) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return postgres.NewDatabase(dataSourceName)
 	}
-	if err = result.prepare(); err != nil {
-		return nil, err
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName)
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName)
+	default:
+		return postgres.NewDatabase(dataSourceName)
 	}
-	return &result, nil
-}
-
-func (d *Database) prepare() error {
-	if err := d.events.prepare(d.db); err != nil {
-		return err
-	}
-
-	return d.txnID.prepare(d.db)
-}
-
-// StoreEvent takes in a gomatrixserverlib.Event and stores it in the database
-// for a transaction worker to pull and later send to an application service.
-func (d *Database) StoreEvent(
-	ctx context.Context,
-	appServiceID string,
-	event *gomatrixserverlib.Event,
-) error {
-	return d.events.insertEvent(ctx, appServiceID, event)
-}
-
-// GetEventsWithAppServiceID returns a slice of events and their IDs intended to
-// be sent to an application service given its ID.
-func (d *Database) GetEventsWithAppServiceID(
-	ctx context.Context,
-	appServiceID string,
-	limit int,
-) (int, int, []gomatrixserverlib.Event, bool, error) {
-	return d.events.selectEventsByApplicationServiceID(ctx, appServiceID, limit)
-}
-
-// CountEventsWithAppServiceID returns the number of events destined for an
-// application service given its ID.
-func (d *Database) CountEventsWithAppServiceID(
-	ctx context.Context,
-	appServiceID string,
-) (int, error) {
-	return d.events.countEventsByApplicationServiceID(ctx, appServiceID)
-}
-
-// UpdateTxnIDForEvents takes in an application service ID and a
-// and stores them in the DB, unless the pair already exists, in
-// which case it updates them.
-func (d *Database) UpdateTxnIDForEvents(
-	ctx context.Context,
-	appserviceID string,
-	maxID, txnID int,
-) error {
-	return d.events.updateTxnIDForEvents(ctx, appserviceID, maxID, txnID)
-}
-
-// RemoveEventsBeforeAndIncludingID removes all events from the database that
-// are less than or equal to a given maximum ID. IDs here are implemented as a
-// serial, thus this should always delete events in chronological order.
-func (d *Database) RemoveEventsBeforeAndIncludingID(
-	ctx context.Context,
-	appserviceID string,
-	eventTableID int,
-) error {
-	return d.events.deleteEventsBeforeAndIncludingID(ctx, appserviceID, eventTableID)
-}
-
-// GetLatestTxnID returns the latest available transaction id
-func (d *Database) GetLatestTxnID(
-	ctx context.Context,
-) (int, error) {
-	return d.txnID.selectTxnID(ctx)
 }
diff --git a/appservice/workers/transaction_scheduler.go b/appservice/workers/transaction_scheduler.go
index 0330eb9ea..faa1e4a96 100644
--- a/appservice/workers/transaction_scheduler.go
+++ b/appservice/workers/transaction_scheduler.go
@@ -43,7 +43,7 @@ var (
 // size), then send that off to the AS's /transactions/{txnID} endpoint. It also
 // handles exponentially backing off in case the AS isn't currently available.
 func SetupTransactionWorkers(
-	appserviceDB *storage.Database,
+	appserviceDB storage.Database,
 	workerStates []types.ApplicationServiceWorkerState,
 ) error {
 	// Create a worker that handles transmitting events to a single homeserver
@@ -58,7 +58,7 @@ func SetupTransactionWorkers(
 
 // worker is a goroutine that sends any queued events to the application service
 // it is given.
-func worker(db *storage.Database, ws types.ApplicationServiceWorkerState) {
+func worker(db storage.Database, ws types.ApplicationServiceWorkerState) {
 	log.WithFields(log.Fields{
 		"appservice": ws.AppService.ID,
 	}).Info("starting application service")
@@ -149,7 +149,7 @@ func backoff(ws *types.ApplicationServiceWorkerState, err error) {
 // transaction, and JSON-encodes the results.
 func createTransaction(
 	ctx context.Context,
-	db *storage.Database,
+	db storage.Database,
 	appserviceID string,
 ) (
 	transactionJSON []byte,
diff --git a/clientapi/auth/storage/accounts/sqlite3/filter_table.go b/clientapi/auth/storage/accounts/sqlite3/filter_table.go
index 691ead775..7f1a0c249 100644
--- a/clientapi/auth/storage/accounts/sqlite3/filter_table.go
+++ b/clientapi/auth/storage/accounts/sqlite3/filter_table.go
@@ -18,6 +18,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"fmt"
 
 	"github.com/matrix-org/gomatrixserverlib"
 )
@@ -47,14 +48,10 @@ const selectFilterIDByContentSQL = "" +
 const insertFilterSQL = "" +
 	"INSERT INTO account_filter (filter, localpart) VALUES ($1, $2)"
 
-const selectLastInsertedFilterIDSQL = "" +
-	"SELECT id FROM account_filter WHERE rowid = last_insert_rowid()"
-
 type filterStatements struct {
-	selectFilterStmt               *sql.Stmt
-	selectLastInsertedFilterIDStmt *sql.Stmt
-	selectFilterIDByContentStmt    *sql.Stmt
-	insertFilterStmt               *sql.Stmt
+	selectFilterStmt            *sql.Stmt
+	selectFilterIDByContentStmt *sql.Stmt
+	insertFilterStmt            *sql.Stmt
 }
 
 func (s *filterStatements) prepare(db *sql.DB) (err error) {
@@ -65,9 +62,6 @@ func (s *filterStatements) prepare(db *sql.DB) (err error) {
 	if s.selectFilterStmt, err = db.Prepare(selectFilterSQL); err != nil {
 		return
 	}
-	if s.selectLastInsertedFilterIDStmt, err = db.Prepare(selectLastInsertedFilterIDSQL); err != nil {
-		return
-	}
 	if s.selectFilterIDByContentStmt, err = db.Prepare(selectFilterIDByContentSQL); err != nil {
 		return
 	}
@@ -128,12 +122,14 @@ func (s *filterStatements) insertFilter(
 	}
 
 	// Otherwise insert the filter and return the new ID
-	if _, err = s.insertFilterStmt.ExecContext(ctx, filterJSON, localpart); err != nil {
+	res, err := s.insertFilterStmt.ExecContext(ctx, filterJSON, localpart)
+	if err != nil {
 		return "", err
 	}
-	row := s.selectLastInsertedFilterIDStmt.QueryRowContext(ctx)
-	if err := row.Scan(&filterID); err != nil {
+	rowid, err := res.LastInsertId()
+	if err != nil {
 		return "", err
 	}
+	filterID = fmt.Sprintf("%d", rowid)
 	return
 }
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 29b27dde2..5810825a4 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,8 +1,4 @@
-<<<<<<< HEAD
 FROM docker.io/golang:1.13.7-alpine3.11
-=======
-FROM docker.io/golang:1.13.6-alpine
->>>>>>> master
 
 RUN mkdir /build
 
diff --git a/mediaapi/storage/sqlite3/media_repository_table.go b/mediaapi/storage/sqlite3/media_repository_table.go
new file mode 100644
index 000000000..8e2e6236a
--- /dev/null
+++ b/mediaapi/storage/sqlite3/media_repository_table.go
@@ -0,0 +1,115 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+	"time"
+
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const mediaSchema = `
+-- The media_repository table holds metadata for each media file stored and accessible to the local server,
+-- the actual file is stored separately.
+CREATE TABLE IF NOT EXISTS mediaapi_media_repository (
+    -- The id used to refer to the media.
+    -- For uploads to this server this is a base64-encoded sha256 hash of the file data
+    -- For media from remote servers, this can be any unique identifier string
+    media_id TEXT NOT NULL,
+    -- The origin of the media as requested by the client. Should be a homeserver domain.
+    media_origin TEXT NOT NULL,
+    -- The MIME-type of the media file as specified when uploading.
+    content_type TEXT NOT NULL,
+    -- Size of the media file in bytes.
+    file_size_bytes INTEGER NOT NULL,
+    -- When the content was uploaded in UNIX epoch ms.
+    creation_ts INTEGER NOT NULL,
+    -- The file name with which the media was uploaded.
+    upload_name TEXT NOT NULL,
+    -- Alternate RFC 4648 unpadded base64 encoding string representation of a SHA-256 hash sum of the file data.
+    base64hash TEXT NOT NULL,
+    -- The user who uploaded the file. Should be a Matrix user ID.
+    user_id TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS mediaapi_media_repository_index ON mediaapi_media_repository (media_id, media_origin);
+`
+
+const insertMediaSQL = `
+INSERT INTO mediaapi_media_repository (media_id, media_origin, content_type, file_size_bytes, creation_ts, upload_name, base64hash, user_id)
+    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+`
+
+const selectMediaSQL = `
+SELECT content_type, file_size_bytes, creation_ts, upload_name, base64hash, user_id FROM mediaapi_media_repository WHERE media_id = $1 AND media_origin = $2
+`
+
+type mediaStatements struct {
+	insertMediaStmt *sql.Stmt
+	selectMediaStmt *sql.Stmt
+}
+
+func (s *mediaStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(mediaSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertMediaStmt, insertMediaSQL},
+		{&s.selectMediaStmt, selectMediaSQL},
+	}.prepare(db)
+}
+
+func (s *mediaStatements) insertMedia(
+	ctx context.Context, mediaMetadata *types.MediaMetadata,
+) error {
+	mediaMetadata.CreationTimestamp = types.UnixMs(time.Now().UnixNano() / 1000000)
+	_, err := s.insertMediaStmt.ExecContext(
+		ctx,
+		mediaMetadata.MediaID,
+		mediaMetadata.Origin,
+		mediaMetadata.ContentType,
+		mediaMetadata.FileSizeBytes,
+		mediaMetadata.CreationTimestamp,
+		mediaMetadata.UploadName,
+		mediaMetadata.Base64Hash,
+		mediaMetadata.UserID,
+	)
+	return err
+}
+
+func (s *mediaStatements) selectMedia(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) (*types.MediaMetadata, error) {
+	mediaMetadata := types.MediaMetadata{
+		MediaID: mediaID,
+		Origin:  mediaOrigin,
+	}
+	err := s.selectMediaStmt.QueryRowContext(
+		ctx, mediaMetadata.MediaID, mediaMetadata.Origin,
+	).Scan(
+		&mediaMetadata.ContentType,
+		&mediaMetadata.FileSizeBytes,
+		&mediaMetadata.CreationTimestamp,
+		&mediaMetadata.UploadName,
+		&mediaMetadata.Base64Hash,
+		&mediaMetadata.UserID,
+	)
+	return &mediaMetadata, err
+}
diff --git a/mediaapi/storage/sqlite3/prepare.go b/mediaapi/storage/sqlite3/prepare.go
new file mode 100644
index 000000000..a6bc24c98
--- /dev/null
+++ b/mediaapi/storage/sqlite3/prepare.go
@@ -0,0 +1,38 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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.
+
+// FIXME: This should be made common!
+
+package sqlite3
+
+import (
+	"database/sql"
+)
+
+// a statementList is a list of SQL statements to prepare and a pointer to where to store the resulting prepared statement.
+type statementList []struct {
+	statement **sql.Stmt
+	sql       string
+}
+
+// prepare the SQL for each statement in the list and assign the result to the prepared statement.
+func (s statementList) prepare(db *sql.DB) (err error) {
+	for _, statement := range s {
+		if *statement.statement, err = db.Prepare(statement.sql); err != nil {
+			return
+		}
+	}
+	return
+}
diff --git a/mediaapi/storage/sqlite3/sql.go b/mediaapi/storage/sqlite3/sql.go
new file mode 100644
index 000000000..9cd78b8ee
--- /dev/null
+++ b/mediaapi/storage/sqlite3/sql.go
@@ -0,0 +1,36 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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 (
+	"database/sql"
+)
+
+type statements struct {
+	media     mediaStatements
+	thumbnail thumbnailStatements
+}
+
+func (s *statements) prepare(db *sql.DB) (err error) {
+	if err = s.media.prepare(db); err != nil {
+		return
+	}
+	if err = s.thumbnail.prepare(db); err != nil {
+		return
+	}
+
+	return
+}
diff --git a/mediaapi/storage/sqlite3/storage.go b/mediaapi/storage/sqlite3/storage.go
new file mode 100644
index 000000000..6477f8305
--- /dev/null
+++ b/mediaapi/storage/sqlite3/storage.go
@@ -0,0 +1,106 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+
+	// Import the postgres database driver.
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// Database is used to store metadata about a repository of media files.
+type Database struct {
+	statements statements
+	db         *sql.DB
+}
+
+// Open opens a postgres database.
+func Open(dataSourceName string) (*Database, error) {
+	var d Database
+	var err error
+	if d.db, err = sql.Open("sqlite3", dataSourceName); err != nil {
+		return nil, err
+	}
+	if err = d.statements.prepare(d.db); err != nil {
+		return nil, err
+	}
+	return &d, nil
+}
+
+// StoreMediaMetadata inserts the metadata about the uploaded media into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreMediaMetadata(
+	ctx context.Context, mediaMetadata *types.MediaMetadata,
+) error {
+	return d.statements.media.insertMedia(ctx, mediaMetadata)
+}
+
+// GetMediaMetadata returns metadata about media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this media.
+func (d *Database) GetMediaMetadata(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) (*types.MediaMetadata, error) {
+	mediaMetadata, err := d.statements.media.selectMedia(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return mediaMetadata, err
+}
+
+// StoreThumbnail inserts the metadata about the thumbnail into the database.
+// Returns an error if the combination of MediaID and Origin are not unique in the table.
+func (d *Database) StoreThumbnail(
+	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
+) error {
+	return d.statements.thumbnail.insertThumbnail(ctx, thumbnailMetadata)
+}
+
+// GetThumbnail returns metadata about a specific thumbnail.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there is no metadata associated with this thumbnail.
+func (d *Database) GetThumbnail(
+	ctx context.Context,
+	mediaID types.MediaID,
+	mediaOrigin gomatrixserverlib.ServerName,
+	width, height int,
+	resizeMethod string,
+) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata, err := d.statements.thumbnail.selectThumbnail(
+		ctx, mediaID, mediaOrigin, width, height, resizeMethod,
+	)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnailMetadata, err
+}
+
+// GetThumbnails returns metadata about all thumbnails for a specific media stored on this server.
+// The media could have been uploaded to this server or fetched from another server and cached here.
+// Returns nil metadata if there are no thumbnails associated with this media.
+func (d *Database) GetThumbnails(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) ([]*types.ThumbnailMetadata, error) {
+	thumbnails, err := d.statements.thumbnail.selectThumbnails(ctx, mediaID, mediaOrigin)
+	if err != nil && err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return thumbnails, err
+}
diff --git a/mediaapi/storage/sqlite3/thumbnail_table.go b/mediaapi/storage/sqlite3/thumbnail_table.go
new file mode 100644
index 000000000..95332c9d4
--- /dev/null
+++ b/mediaapi/storage/sqlite3/thumbnail_table.go
@@ -0,0 +1,162 @@
+// Copyright 2017-2018 New Vector Ltd
+// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
+//
+// 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"
+	"time"
+
+	"github.com/matrix-org/dendrite/mediaapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const thumbnailSchema = `
+-- The mediaapi_thumbnail table holds metadata for each thumbnail file stored and accessible to the local server,
+-- the actual file is stored separately.
+CREATE TABLE IF NOT EXISTS mediaapi_thumbnail (
+    media_id TEXT NOT NULL,
+    media_origin TEXT NOT NULL,
+    content_type TEXT NOT NULL,
+    file_size_bytes INTEGER NOT NULL,
+    creation_ts INTEGER NOT NULL,
+    width INTEGER NOT NULL,
+    height INTEGER NOT NULL,
+    resize_method TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS mediaapi_thumbnail_index ON mediaapi_thumbnail (media_id, media_origin, width, height, resize_method);
+`
+
+const insertThumbnailSQL = `
+INSERT INTO mediaapi_thumbnail (media_id, media_origin, content_type, file_size_bytes, creation_ts, width, height, resize_method)
+    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+`
+
+// Note: this selects one specific thumbnail
+const selectThumbnailSQL = `
+SELECT content_type, file_size_bytes, creation_ts FROM mediaapi_thumbnail WHERE media_id = $1 AND media_origin = $2 AND width = $3 AND height = $4 AND resize_method = $5
+`
+
+// Note: this selects all thumbnails for a media_origin and media_id
+const selectThumbnailsSQL = `
+SELECT content_type, file_size_bytes, creation_ts, width, height, resize_method FROM mediaapi_thumbnail WHERE media_id = $1 AND media_origin = $2
+`
+
+type thumbnailStatements struct {
+	insertThumbnailStmt  *sql.Stmt
+	selectThumbnailStmt  *sql.Stmt
+	selectThumbnailsStmt *sql.Stmt
+}
+
+func (s *thumbnailStatements) prepare(db *sql.DB) (err error) {
+	_, err = db.Exec(thumbnailSchema)
+	if err != nil {
+		return
+	}
+
+	return statementList{
+		{&s.insertThumbnailStmt, insertThumbnailSQL},
+		{&s.selectThumbnailStmt, selectThumbnailSQL},
+		{&s.selectThumbnailsStmt, selectThumbnailsSQL},
+	}.prepare(db)
+}
+
+func (s *thumbnailStatements) insertThumbnail(
+	ctx context.Context, thumbnailMetadata *types.ThumbnailMetadata,
+) error {
+	thumbnailMetadata.MediaMetadata.CreationTimestamp = types.UnixMs(time.Now().UnixNano() / 1000000)
+	_, err := s.insertThumbnailStmt.ExecContext(
+		ctx,
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.MediaMetadata.ContentType,
+		thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		thumbnailMetadata.MediaMetadata.CreationTimestamp,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	)
+	return err
+}
+
+func (s *thumbnailStatements) selectThumbnail(
+	ctx context.Context,
+	mediaID types.MediaID,
+	mediaOrigin gomatrixserverlib.ServerName,
+	width, height int,
+	resizeMethod string,
+) (*types.ThumbnailMetadata, error) {
+	thumbnailMetadata := types.ThumbnailMetadata{
+		MediaMetadata: &types.MediaMetadata{
+			MediaID: mediaID,
+			Origin:  mediaOrigin,
+		},
+		ThumbnailSize: types.ThumbnailSize{
+			Width:        width,
+			Height:       height,
+			ResizeMethod: resizeMethod,
+		},
+	}
+	err := s.selectThumbnailStmt.QueryRowContext(
+		ctx,
+		thumbnailMetadata.MediaMetadata.MediaID,
+		thumbnailMetadata.MediaMetadata.Origin,
+		thumbnailMetadata.ThumbnailSize.Width,
+		thumbnailMetadata.ThumbnailSize.Height,
+		thumbnailMetadata.ThumbnailSize.ResizeMethod,
+	).Scan(
+		&thumbnailMetadata.MediaMetadata.ContentType,
+		&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+		&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+	)
+	return &thumbnailMetadata, err
+}
+
+func (s *thumbnailStatements) selectThumbnails(
+	ctx context.Context, mediaID types.MediaID, mediaOrigin gomatrixserverlib.ServerName,
+) ([]*types.ThumbnailMetadata, error) {
+	rows, err := s.selectThumbnailsStmt.QueryContext(
+		ctx, mediaID, mediaOrigin,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close() // nolint: errcheck
+
+	var thumbnails []*types.ThumbnailMetadata
+	for rows.Next() {
+		thumbnailMetadata := types.ThumbnailMetadata{
+			MediaMetadata: &types.MediaMetadata{
+				MediaID: mediaID,
+				Origin:  mediaOrigin,
+			},
+		}
+		err = rows.Scan(
+			&thumbnailMetadata.MediaMetadata.ContentType,
+			&thumbnailMetadata.MediaMetadata.FileSizeBytes,
+			&thumbnailMetadata.MediaMetadata.CreationTimestamp,
+			&thumbnailMetadata.ThumbnailSize.Width,
+			&thumbnailMetadata.ThumbnailSize.Height,
+			&thumbnailMetadata.ThumbnailSize.ResizeMethod,
+		)
+		if err != nil {
+			return nil, err
+		}
+		thumbnails = append(thumbnails, &thumbnailMetadata)
+	}
+
+	return thumbnails, rows.Err()
+}
diff --git a/mediaapi/storage/storage.go b/mediaapi/storage/storage.go
index 2c7f937dd..1d35a95ed 100644
--- a/mediaapi/storage/storage.go
+++ b/mediaapi/storage/storage.go
@@ -19,6 +19,7 @@ import (
 	"net/url"
 
 	"github.com/matrix-org/dendrite/mediaapi/storage/postgres"
+	"github.com/matrix-org/dendrite/mediaapi/storage/sqlite3"
 	"github.com/matrix-org/dendrite/mediaapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
@@ -40,6 +41,8 @@ func Open(dataSourceName string) (Database, error) {
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.Open(dataSourceName)
+	case "file":
+		return sqlite3.Open(dataSourceName)
 	default:
 		return postgres.Open(dataSourceName)
 	}
diff --git a/publicroomsapi/storage/sqlite3/public_rooms_table.go b/publicroomsapi/storage/sqlite3/public_rooms_table.go
index 06c74a331..3fe3d3cab 100644
--- a/publicroomsapi/storage/sqlite3/public_rooms_table.go
+++ b/publicroomsapi/storage/sqlite3/public_rooms_table.go
@@ -39,26 +39,15 @@ var editableAttributes = []string{
 const publicRoomsSchema = `
 -- Stores all of the rooms with data needed to create the server's room directory
 CREATE TABLE IF NOT EXISTS publicroomsapi_public_rooms(
-	-- The room's ID
 	room_id TEXT NOT NULL PRIMARY KEY,
-	-- Number of joined members in the room
 	joined_members INTEGER NOT NULL DEFAULT 0,
-	-- Aliases of the room (empty array if none)
-	aliases TEXT[] NOT NULL DEFAULT '{}'::TEXT[],
-	-- Canonical alias of the room (empty string if none)
+	aliases TEXT NOT NULL DEFAULT '',
 	canonical_alias TEXT NOT NULL DEFAULT '',
-	-- Name of the room (empty string if none)
 	name TEXT NOT NULL DEFAULT '',
-	-- Topic of the room (empty string if none)
 	topic TEXT NOT NULL DEFAULT '',
-	-- Is the room world readable?
 	world_readable BOOLEAN NOT NULL DEFAULT false,
-	-- Can guest join the room?
 	guest_can_join BOOLEAN NOT NULL DEFAULT false,
-	-- URL of the room avatar (empty string if none)
 	avatar_url TEXT NOT NULL DEFAULT '',
-	-- Visibility of the room: true means the room is publicly visible, false
-	-- means the room is private
 	visibility BOOLEAN NOT NULL DEFAULT false
 );
 `
@@ -71,13 +60,13 @@ const selectPublicRoomsSQL = "" +
 	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
 	" FROM publicroomsapi_public_rooms WHERE visibility = true" +
 	" ORDER BY joined_members DESC" +
-	" OFFSET $1"
+	" LIMIT 30 OFFSET $1"
 
 const selectPublicRoomsWithLimitSQL = "" +
 	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
 	" FROM publicroomsapi_public_rooms WHERE visibility = true" +
 	" ORDER BY joined_members DESC" +
-	" OFFSET $1 LIMIT $2"
+	" LIMIT $2 OFFSET $1"
 
 const selectPublicRoomsWithFilterSQL = "" +
 	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
@@ -85,9 +74,9 @@ const selectPublicRoomsWithFilterSQL = "" +
 	" WHERE visibility = true" +
 	" AND (LOWER(name) LIKE LOWER($1)" +
 	" OR LOWER(topic) LIKE LOWER($1)" +
-	" OR LOWER(ARRAY_TO_STRING(aliases, ',')) LIKE LOWER($1))" +
+	" OR LOWER(aliases) LIKE LOWER($1))" + // TODO: Is there a better way to search aliases?
 	" ORDER BY joined_members DESC" +
-	" OFFSET $2"
+	" LIMIT 30 OFFSET $2"
 
 const selectPublicRoomsWithLimitAndFilterSQL = "" +
 	"SELECT room_id, joined_members, aliases, canonical_alias, name, topic, world_readable, guest_can_join, avatar_url" +
@@ -95,9 +84,9 @@ const selectPublicRoomsWithLimitAndFilterSQL = "" +
 	" WHERE visibility = true" +
 	" AND (LOWER(name) LIKE LOWER($1)" +
 	" OR LOWER(topic) LIKE LOWER($1)" +
-	" OR LOWER(ARRAY_TO_STRING(aliases, ',')) LIKE LOWER($1))" +
+	" OR LOWER(aliases) LIKE LOWER($1))" + // TODO: Is there a better way to search aliases?
 	" ORDER BY joined_members DESC" +
-	" OFFSET $2 LIMIT $3"
+	" LIMIT $3 OFFSET $2"
 
 const selectRoomVisibilitySQL = "" +
 	"SELECT visibility FROM publicroomsapi_public_rooms" +
@@ -187,7 +176,7 @@ func (s *publicRoomsStatements) selectPublicRooms(
 			)
 		} else {
 			rows, err = s.selectPublicRoomsWithLimitAndFilterStmt.QueryContext(
-				ctx, pattern, offset, limit,
+				ctx, pattern, limit, offset,
 			)
 		}
 	} else {
@@ -195,7 +184,7 @@ func (s *publicRoomsStatements) selectPublicRooms(
 			rows, err = s.selectPublicRoomsStmt.QueryContext(ctx, offset)
 		} else {
 			rows, err = s.selectPublicRoomsWithLimitStmt.QueryContext(
-				ctx, offset, limit,
+				ctx, limit, offset,
 			)
 		}
 	}
diff --git a/publicroomsapi/storage/storage.go b/publicroomsapi/storage/storage.go
index a6e18fbcb..29a6619fa 100644
--- a/publicroomsapi/storage/storage.go
+++ b/publicroomsapi/storage/storage.go
@@ -20,6 +20,7 @@ import (
 
 	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/publicroomsapi/storage/postgres"
+	"github.com/matrix-org/dendrite/publicroomsapi/storage/sqlite3"
 	"github.com/matrix-org/dendrite/publicroomsapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
@@ -43,6 +44,8 @@ func NewPublicRoomsServerDatabase(dataSourceName string) (Database, error) {
 	switch uri.Scheme {
 	case "postgres":
 		return postgres.NewPublicRoomsServerDatabase(dataSourceName)
+	case "file":
+		return sqlite3.NewPublicRoomsServerDatabase(dataSourceName)
 	default:
 		return postgres.NewPublicRoomsServerDatabase(dataSourceName)
 	}
diff --git a/roomserver/storage/sqlite3/invite_table.go b/roomserver/storage/sqlite3/invite_table.go
index 5a0f0bf79..641f80156 100644
--- a/roomserver/storage/sqlite3/invite_table.go
+++ b/roomserver/storage/sqlite3/invite_table.go
@@ -52,16 +52,18 @@ const selectInviteActiveForUserInRoomSQL = "" +
 // However the matrix protocol doesn't give us a way to reliably identify the
 // invites that were retired, so we are forced to retire all of them.
 const updateInviteRetiredSQL = `
-	UPDATE roomserver_invites SET retired = TRUE
-	  WHERE room_nid = $1 AND target_nid = $2 AND NOT retired;
-	SELECT invite_event_id FROM roomserver_invites
-		WHERE rowid = last_insert_rowid();
+	UPDATE roomserver_invites SET retired = TRUE WHERE room_nid = $1 AND target_nid = $2 AND NOT retired
+`
+
+const selectInvitesAboutToRetireSQL = `
+SELECT invite_event_id FROM roomserver_invites WHERE room_nid = $1 AND target_nid = $2 AND NOT retired
 `
 
 type inviteStatements struct {
 	insertInviteEventStmt               *sql.Stmt
 	selectInviteActiveForUserInRoomStmt *sql.Stmt
 	updateInviteRetiredStmt             *sql.Stmt
+	selectInvitesAboutToRetireStmt      *sql.Stmt
 }
 
 func (s *inviteStatements) prepare(db *sql.DB) (err error) {
@@ -74,6 +76,7 @@ func (s *inviteStatements) prepare(db *sql.DB) (err error) {
 		{&s.insertInviteEventStmt, insertInviteEventSQL},
 		{&s.selectInviteActiveForUserInRoomStmt, selectInviteActiveForUserInRoomSQL},
 		{&s.updateInviteRetiredStmt, updateInviteRetiredSQL},
+		{&s.selectInvitesAboutToRetireStmt, selectInvitesAboutToRetireSQL},
 	}.prepare(db)
 }
 
@@ -102,7 +105,8 @@ func (s *inviteStatements) updateInviteRetired(
 	ctx context.Context,
 	txn *sql.Tx, roomNID types.RoomNID, targetUserNID types.EventStateKeyNID,
 ) (eventIDs []string, err error) {
-	stmt := common.TxStmt(txn, s.updateInviteRetiredStmt)
+	// gather all the event IDs we will retire
+	stmt := txn.Stmt(s.selectInvitesAboutToRetireStmt)
 	rows, err := stmt.QueryContext(ctx, roomNID, targetUserNID)
 	if err != nil {
 		return nil, err
@@ -110,11 +114,15 @@ func (s *inviteStatements) updateInviteRetired(
 	defer (func() { err = rows.Close() })()
 	for rows.Next() {
 		var inviteEventID string
-		if err := rows.Scan(&inviteEventID); err != nil {
+		if err = rows.Scan(&inviteEventID); err != nil {
 			return nil, err
 		}
 		eventIDs = append(eventIDs, inviteEventID)
 	}
+
+	// now retire the invites
+	stmt = txn.Stmt(s.updateInviteRetiredStmt)
+	_, err = stmt.ExecContext(ctx, roomNID, targetUserNID)
 	return
 }
 
diff --git a/roomserver/storage/sqlite3/room_aliases_table.go b/roomserver/storage/sqlite3/room_aliases_table.go
index a5fd5449a..71238b0e4 100644
--- a/roomserver/storage/sqlite3/room_aliases_table.go
+++ b/roomserver/storage/sqlite3/room_aliases_table.go
@@ -103,6 +103,8 @@ func (s *roomAliasesStatements) selectAliasesFromRoomID(
 		return
 	}
 
+	defer rows.Close() // nolint: errcheck
+
 	for rows.Next() {
 		var alias string
 		if err = rows.Scan(&alias); err != nil {
diff --git a/roomserver/storage/sqlite3/state_block_table.go b/roomserver/storage/sqlite3/state_block_table.go
index ac593546a..d75abceec 100644
--- a/roomserver/storage/sqlite3/state_block_table.go
+++ b/roomserver/storage/sqlite3/state_block_table.go
@@ -30,7 +30,7 @@ import (
 
 const stateDataSchema = `
   CREATE TABLE IF NOT EXISTS roomserver_state_block (
-    state_block_nid INTEGER PRIMARY KEY AUTOINCREMENT,
+    state_block_nid INTEGER NOT NULL,
     event_type_nid INTEGER NOT NULL,
     event_state_key_nid INTEGER NOT NULL,
     event_nid INTEGER NOT NULL,
@@ -43,10 +43,7 @@ const insertStateDataSQL = "" +
 	" VALUES ($1, $2, $3, $4)"
 
 const selectNextStateBlockNIDSQL = `
-	SELECT COALESCE((
-		SELECT seq+1 AS state_block_nid FROM sqlite_sequence
-		WHERE name = 'roomserver_state_block'), 1
-	) AS state_block_nid
+SELECT IFNULL(MAX(state_block_nid), 0) + 1 FROM roomserver_state_block
 `
 
 // Bulk state lookup by numeric state block ID.
@@ -98,11 +95,19 @@ func (s *stateBlockStatements) prepare(db *sql.DB) (err error) {
 
 func (s *stateBlockStatements) bulkInsertStateData(
 	ctx context.Context, txn *sql.Tx,
-	stateBlockNID types.StateBlockNID,
 	entries []types.StateEntry,
-) error {
+) (types.StateBlockNID, error) {
+	if len(entries) == 0 {
+		return 0, nil
+	}
+	var stateBlockNID types.StateBlockNID
+	err := txn.Stmt(s.selectNextStateBlockNIDStmt).QueryRowContext(ctx).Scan(&stateBlockNID)
+	if err != nil {
+		return 0, err
+	}
+
 	for _, entry := range entries {
-		_, err := common.TxStmt(txn, s.insertStateDataStmt).ExecContext(
+		_, err := txn.Stmt(s.insertStateDataStmt).ExecContext(
 			ctx,
 			int64(stateBlockNID),
 			int64(entry.EventTypeNID),
@@ -110,20 +115,10 @@ func (s *stateBlockStatements) bulkInsertStateData(
 			int64(entry.EventNID),
 		)
 		if err != nil {
-			return err
+			return 0, err
 		}
 	}
-	return nil
-}
-
-func (s *stateBlockStatements) selectNextStateBlockNID(
-	ctx context.Context,
-	txn *sql.Tx,
-) (types.StateBlockNID, error) {
-	var stateBlockNID int64
-	selectStmt := common.TxStmt(txn, s.selectNextStateBlockNIDStmt)
-	err := selectStmt.QueryRowContext(ctx).Scan(&stateBlockNID)
-	return types.StateBlockNID(stateBlockNID), err
+	return stateBlockNID, nil
 }
 
 func (s *stateBlockStatements) bulkSelectStateBlockEntries(
diff --git a/roomserver/storage/sqlite3/storage.go b/roomserver/storage/sqlite3/storage.go
index e20e8aed7..aebb308c4 100644
--- a/roomserver/storage/sqlite3/storage.go
+++ b/roomserver/storage/sqlite3/storage.go
@@ -54,7 +54,12 @@ func Open(dataSourceName string) (*Database, error) {
 	}
 	//d.db.Exec("PRAGMA journal_mode=WAL;")
 	//d.db.Exec("PRAGMA read_uncommitted = true;")
-	d.db.SetMaxOpenConns(2)
+
+	// FIXME: We are leaking connections somewhere. Setting this to 2 will eventually
+	// cause the roomserver to be unresponsive to new events because something will
+	// acquire the global mutex and never unlock it because it is waiting for a connection
+	// which it will never obtain.
+	d.db.SetMaxOpenConns(20)
 	if err = d.statements.prepare(d.db); err != nil {
 		return nil, err
 	}
@@ -253,12 +258,13 @@ func (d *Database) Events(
 ) ([]types.Event, error) {
 	var eventJSONs []eventJSONPair
 	var err error
-	results := make([]types.Event, len(eventNIDs))
+	var results []types.Event
 	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
 		eventJSONs, err = d.statements.bulkSelectEventJSON(ctx, txn, eventNIDs)
 		if err != nil || len(eventJSONs) == 0 {
 			return nil
 		}
+		results = make([]types.Event, len(eventJSONs))
 		for i, eventJSON := range eventJSONs {
 			result := &results[i]
 			result.EventNID = eventJSON.EventNID
@@ -286,13 +292,10 @@ func (d *Database) AddState(
 	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
 		if len(state) > 0 {
 			var stateBlockNID types.StateBlockNID
-			stateBlockNID, err = d.statements.selectNextStateBlockNID(ctx, txn)
+			stateBlockNID, err = d.statements.bulkInsertStateData(ctx, txn, state)
 			if err != nil {
 				return err
 			}
-			if err = d.statements.bulkInsertStateData(ctx, txn, stateBlockNID, state); err != nil {
-				return err
-			}
 			stateBlockNIDs = append(stateBlockNIDs[:len(stateBlockNIDs):len(stateBlockNIDs)], stateBlockNID)
 		}
 		stateNID, err = d.statements.insertState(ctx, txn, roomNID, stateBlockNIDs)
@@ -602,8 +605,9 @@ func (d *Database) StateEntriesForTuples(
 // MembershipUpdater implements input.RoomEventDatabase
 func (d *Database) MembershipUpdater(
 	ctx context.Context, roomID, targetUserID string,
-) (types.MembershipUpdater, error) {
-	txn, err := d.db.Begin()
+) (updater types.MembershipUpdater, err error) {
+	var txn *sql.Tx
+	txn, err = d.db.Begin()
 	if err != nil {
 		return nil, err
 	}
@@ -611,6 +615,18 @@ func (d *Database) MembershipUpdater(
 	defer func() {
 		if !succeeded {
 			txn.Rollback() // nolint: errcheck
+		} else {
+			// TODO: We should be holding open this transaction but we cannot have
+			// multiple write transactions on sqlite. The code will perform additional
+			// write transactions independent of this one which will consistently cause
+			// 'database is locked' errors. For now, we'll break up the transaction and
+			// hope we don't race too catastrophically. Long term, we should be able to
+			// thread in txn objects where appropriate (either at the interface level or
+			// bring matrix business logic into the storage layer).
+			txerr := txn.Commit()
+			if err == nil && txerr != nil {
+				err = txerr
+			}
 		}
 	}()
 
@@ -624,7 +640,7 @@ func (d *Database) MembershipUpdater(
 		return nil, err
 	}
 
-	updater, err := d.membershipUpdaterTxn(ctx, txn, roomNID, targetUserNID)
+	updater, err = d.membershipUpdaterTxn(ctx, txn, roomNID, targetUserNID)
 	if err != nil {
 		return nil, err
 	}
@@ -658,7 +674,8 @@ func (d *Database) membershipUpdaterTxn(
 	}
 
 	return &membershipUpdater{
-		transaction{ctx, txn}, d, roomNID, targetUserNID, membership,
+		// purposefully set the txn to nil so if we try to use it we panic and fail fast
+		transaction{ctx, nil}, d, roomNID, targetUserNID, membership,
 	}, nil
 }
 
diff --git a/show-expected-fail-tests.sh b/show-expected-fail-tests.sh
index d3872ad59..9cd51b007 100755
--- a/show-expected-fail-tests.sh
+++ b/show-expected-fail-tests.sh
@@ -76,14 +76,30 @@ while read -r test_name; do
 	fi
 done <<< "${passed_but_expected_fail}"
 
+# TODO: Check that the same test doesn't exist in both the whitelist and blacklist
+# TODO: Check that the same test doesn't appear twice in the whitelist|blacklist
+
+# Trim test output strings
+tests_to_add=$(echo -e $tests_to_add | xargs)
+already_in_whitelist=$(echo -e $already_in_whitelist | xargs)
+
+# Format output with markdown for buildkite annotation rendering purposes
+if [ -n "${tests_to_add}" ] && [ -n "${already_in_whitelist}" ]; then
+	echo "### 📜 SyTest Whitelist Maintenance"
+fi
+
 if [ -n "${tests_to_add}" ]; then
-	echo "ERROR: The following passed tests are not present in $2. Please append them to the file:"
+	echo "**ERROR**: The following tests passed but are not present in \`$2\`. Please append them to the file:"
+    echo "\`\`\`"
 	echo -e "${tests_to_add}"
+    echo "\`\`\`"
 fi
 
 if [ -n "${already_in_whitelist}" ]; then
-	echo "WARN: Tests in the whitelist still marked as expected fail:"
+	echo "**WARN**: Tests in the whitelist still marked as **expected fail**:"
+    echo "\`\`\`"
 	echo -e "${already_in_whitelist}"
+    echo "\`\`\`"
 fi
 
 exit ${fail_build}
diff --git a/syncapi/consumers/roomserver.go b/syncapi/consumers/roomserver.go
index ba1b7dc59..5dbef4b7d 100644
--- a/syncapi/consumers/roomserver.go
+++ b/syncapi/consumers/roomserver.go
@@ -158,6 +158,7 @@ func (s *OutputRoomEventConsumer) onNewInviteEvent(
 		// panic rather than continue with an inconsistent database
 		log.WithFields(log.Fields{
 			"event":      string(msg.Event.JSON()),
+			"pdupos":     pduPos,
 			log.ErrorKey: err,
 		}).Panicf("roomserver output log: write invite failure")
 		return nil
diff --git a/syncapi/storage/sqlite3/account_data_table.go b/syncapi/storage/sqlite3/account_data_table.go
index 3274e66ea..71105d0c3 100644
--- a/syncapi/storage/sqlite3/account_data_table.go
+++ b/syncapi/storage/sqlite3/account_data_table.go
@@ -19,15 +19,13 @@ import (
 	"context"
 	"database/sql"
 
-	"github.com/lib/pq"
-	"github.com/matrix-org/dendrite/common"
 	"github.com/matrix-org/dendrite/syncapi/types"
 	"github.com/matrix-org/gomatrixserverlib"
 )
 
 const accountDataSchema = `
 CREATE TABLE IF NOT EXISTS syncapi_account_data_type (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    id INTEGER PRIMARY KEY,
     user_id TEXT NOT NULL,
     room_id TEXT NOT NULL,
     type TEXT NOT NULL,
@@ -43,9 +41,7 @@ const insertAccountDataSQL = "" +
 const selectAccountDataInRangeSQL = "" +
 	"SELECT room_id, type FROM syncapi_account_data_type" +
 	" WHERE user_id = $1 AND id > $2 AND id <= $3" +
-	" AND ( $4 IS NULL OR     type IN ($4)  )" +
-	" AND ( $5 IS NULL OR NOT(type IN ($5)) )" +
-	" ORDER BY id ASC LIMIT $6"
+	" ORDER BY id ASC"
 
 const selectMaxAccountDataIDSQL = "" +
 	"SELECT MAX(id) FROM syncapi_account_data_type"
@@ -53,8 +49,8 @@ const selectMaxAccountDataIDSQL = "" +
 type accountDataStatements struct {
 	streamIDStatements           *streamIDStatements
 	insertAccountDataStmt        *sql.Stmt
-	selectAccountDataInRangeStmt *sql.Stmt
 	selectMaxAccountDataIDStmt   *sql.Stmt
+	selectAccountDataInRangeStmt *sql.Stmt
 }
 
 func (s *accountDataStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
@@ -66,10 +62,10 @@ func (s *accountDataStatements) prepare(db *sql.DB, streamID *streamIDStatements
 	if s.insertAccountDataStmt, err = db.Prepare(insertAccountDataSQL); err != nil {
 		return
 	}
-	if s.selectAccountDataInRangeStmt, err = db.Prepare(selectAccountDataInRangeSQL); err != nil {
+	if s.selectMaxAccountDataIDStmt, err = db.Prepare(selectMaxAccountDataIDSQL); err != nil {
 		return
 	}
-	if s.selectMaxAccountDataIDStmt, err = db.Prepare(selectMaxAccountDataIDSQL); err != nil {
+	if s.selectAccountDataInRangeStmt, err = db.Prepare(selectAccountDataInRangeSQL); err != nil {
 		return
 	}
 	return
@@ -83,8 +79,7 @@ func (s *accountDataStatements) insertAccountData(
 	if err != nil {
 		return
 	}
-	insertStmt := common.TxStmt(txn, s.insertAccountDataStmt)
-	_, err = insertStmt.ExecContext(ctx, pos, userID, roomID, dataType)
+	_, err = txn.Stmt(s.insertAccountDataStmt).ExecContext(ctx, pos, userID, roomID, dataType)
 	return
 }
 
@@ -103,14 +98,13 @@ func (s *accountDataStatements) selectAccountDataInRange(
 		oldPos--
 	}
 
-	rows, err := s.selectAccountDataInRangeStmt.QueryContext(ctx, userID, oldPos, newPos,
-		pq.StringArray(filterConvertTypeWildcardToSQL(accountDataFilterPart.Types)),
-		pq.StringArray(filterConvertTypeWildcardToSQL(accountDataFilterPart.NotTypes)),
-		accountDataFilterPart.Limit,
-	)
+	rows, err := s.selectAccountDataInRangeStmt.QueryContext(ctx, userID, oldPos, newPos)
 	if err != nil {
 		return
 	}
+	defer rows.Close() // nolint: errcheck
+
+	var entries int
 
 	for rows.Next() {
 		var dataType string
@@ -120,22 +114,41 @@ func (s *accountDataStatements) selectAccountDataInRange(
 			return
 		}
 
+		// check if we should add this by looking at the filter.
+		// It would be nice if we could do this in SQL-land, but the mix of variadic
+		// and positional parameters makes the query annoyingly hard to do, it's easier
+		// and clearer to do it in Go-land. If there are no filters for [not]types then
+		// this gets skipped.
+		for _, includeType := range accountDataFilterPart.Types {
+			if includeType != dataType { // TODO: wildcard support
+				continue
+			}
+		}
+		for _, excludeType := range accountDataFilterPart.NotTypes {
+			if excludeType == dataType { // TODO: wildcard support
+				continue
+			}
+		}
+
 		if len(data[roomID]) > 0 {
 			data[roomID] = append(data[roomID], dataType)
 		} else {
 			data[roomID] = []string{dataType}
 		}
+		entries++
+		if entries >= accountDataFilterPart.Limit {
+			break
+		}
 	}
 
-	return
+	return data, nil
 }
 
 func (s *accountDataStatements) selectMaxAccountDataID(
 	ctx context.Context, txn *sql.Tx,
 ) (id int64, err error) {
 	var nullableID sql.NullInt64
-	stmt := common.TxStmt(txn, s.selectMaxAccountDataIDStmt)
-	err = stmt.QueryRowContext(ctx).Scan(&nullableID)
+	err = txn.Stmt(s.selectMaxAccountDataIDStmt).QueryRowContext(ctx).Scan(&nullableID)
 	if nullableID.Valid {
 		id = nullableID.Int64
 	}
diff --git a/syncapi/storage/sqlite3/current_room_state_table.go b/syncapi/storage/sqlite3/current_room_state_table.go
index 4ce946667..eb969c956 100644
--- a/syncapi/storage/sqlite3/current_room_state_table.go
+++ b/syncapi/storage/sqlite3/current_room_state_table.go
@@ -19,6 +19,7 @@ import (
 	"context"
 	"database/sql"
 	"encoding/json"
+	"strings"
 
 	"github.com/lib/pq"
 	"github.com/matrix-org/dendrite/common"
@@ -88,7 +89,6 @@ type currentRoomStateStatements struct {
 	selectRoomIDsWithMembershipStmt *sql.Stmt
 	selectCurrentStateStmt          *sql.Stmt
 	selectJoinedUsersStmt           *sql.Stmt
-	selectEventsWithEventIDsStmt    *sql.Stmt
 	selectStateEventStmt            *sql.Stmt
 }
 
@@ -113,9 +113,6 @@ func (s *currentRoomStateStatements) prepare(db *sql.DB, streamID *streamIDState
 	if s.selectJoinedUsersStmt, err = db.Prepare(selectJoinedUsersSQL); err != nil {
 		return
 	}
-	if s.selectEventsWithEventIDsStmt, err = db.Prepare(selectEventsWithEventIDsSQL); err != nil {
-		return
-	}
 	if s.selectStateEventStmt, err = db.Prepare(selectStateEventSQL); err != nil {
 		return
 	}
@@ -233,8 +230,12 @@ func (s *currentRoomStateStatements) upsertRoomState(
 func (s *currentRoomStateStatements) selectEventsWithEventIDs(
 	ctx context.Context, txn *sql.Tx, eventIDs []string,
 ) ([]types.StreamEvent, error) {
-	stmt := common.TxStmt(txn, s.selectEventsWithEventIDsStmt)
-	rows, err := stmt.QueryContext(ctx, pq.StringArray(eventIDs))
+	iEventIDs := make([]interface{}, len(eventIDs))
+	for k, v := range eventIDs {
+		iEventIDs[k] = v
+	}
+	query := strings.Replace(selectEventsWithEventIDsSQL, "($1)", common.QueryVariadic(len(iEventIDs)), 1)
+	rows, err := txn.QueryContext(ctx, query, iEventIDs...)
 	if err != nil {
 		return nil, err
 	}
diff --git a/syncapi/storage/sqlite3/invites_table.go b/syncapi/storage/sqlite3/invites_table.go
index 74dba245b..baf8871bd 100644
--- a/syncapi/storage/sqlite3/invites_table.go
+++ b/syncapi/storage/sqlite3/invites_table.go
@@ -26,7 +26,7 @@ import (
 
 const inviteEventsSchema = `
 CREATE TABLE IF NOT EXISTS syncapi_invite_events (
-	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	id INTEGER PRIMARY KEY,
 	event_id TEXT NOT NULL,
 	room_id TEXT NOT NULL,
 	target_user_id TEXT NOT NULL,
@@ -39,11 +39,8 @@ CREATE INDEX IF NOT EXISTS syncapi_invites_event_id_idx ON syncapi_invite_events
 
 const insertInviteEventSQL = "" +
 	"INSERT INTO syncapi_invite_events" +
-	" (room_id, event_id, target_user_id, event_json)" +
-	" VALUES ($1, $2, $3, $4)"
-
-const selectLastInsertedInviteEventSQL = "" +
-	"SELECT id FROM syncapi_invite_events WHERE rowid = last_insert_rowid()"
+	" (id, room_id, event_id, target_user_id, event_json)" +
+	" VALUES ($1, $2, $3, $4, $5)"
 
 const deleteInviteEventSQL = "" +
 	"DELETE FROM syncapi_invite_events WHERE event_id = $1"
@@ -57,12 +54,11 @@ const selectMaxInviteIDSQL = "" +
 	"SELECT MAX(id) FROM syncapi_invite_events"
 
 type inviteEventsStatements struct {
-	streamIDStatements                *streamIDStatements
-	insertInviteEventStmt             *sql.Stmt
-	selectLastInsertedInviteEventStmt *sql.Stmt
-	selectInviteEventsInRangeStmt     *sql.Stmt
-	deleteInviteEventStmt             *sql.Stmt
-	selectMaxInviteIDStmt             *sql.Stmt
+	streamIDStatements            *streamIDStatements
+	insertInviteEventStmt         *sql.Stmt
+	selectInviteEventsInRangeStmt *sql.Stmt
+	deleteInviteEventStmt         *sql.Stmt
+	selectMaxInviteIDStmt         *sql.Stmt
 }
 
 func (s *inviteEventsStatements) prepare(db *sql.DB, streamID *streamIDStatements) (err error) {
@@ -74,9 +70,6 @@ func (s *inviteEventsStatements) prepare(db *sql.DB, streamID *streamIDStatement
 	if s.insertInviteEventStmt, err = db.Prepare(insertInviteEventSQL); err != nil {
 		return
 	}
-	if s.selectLastInsertedInviteEventStmt, err = db.Prepare(selectLastInsertedInviteEventSQL); err != nil {
-		return
-	}
 	if s.selectInviteEventsInRangeStmt, err = db.Prepare(selectInviteEventsInRangeSQL); err != nil {
 		return
 	}
@@ -90,19 +83,16 @@ func (s *inviteEventsStatements) prepare(db *sql.DB, streamID *streamIDStatement
 }
 
 func (s *inviteEventsStatements) insertInviteEvent(
-	ctx context.Context, inviteEvent gomatrixserverlib.Event,
-) (streamPos types.StreamPosition, err error) {
-	_, err = s.insertInviteEventStmt.ExecContext(
+	ctx context.Context, txn *sql.Tx, inviteEvent gomatrixserverlib.Event, streamPos types.StreamPosition,
+) (err error) {
+	_, err = txn.Stmt(s.insertInviteEventStmt).ExecContext(
 		ctx,
+		streamPos,
 		inviteEvent.RoomID(),
 		inviteEvent.EventID(),
 		*inviteEvent.StateKey(),
 		inviteEvent.JSON(),
 	)
-	if err != nil {
-		return
-	}
-	err = s.selectLastInsertedInviteEventStmt.QueryRowContext(ctx).Scan(&streamPos)
 	return
 }
 
diff --git a/syncapi/storage/sqlite3/output_room_events_table.go b/syncapi/storage/sqlite3/output_room_events_table.go
index 8c01f2ced..4535688df 100644
--- a/syncapi/storage/sqlite3/output_room_events_table.go
+++ b/syncapi/storage/sqlite3/output_room_events_table.go
@@ -54,9 +54,6 @@ const insertEventSQL = "" +
 	") VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12) " +
 	"ON CONFLICT (event_id) DO UPDATE SET exclude_from_sync = $11"
 
-const selectLastInsertedEventSQL = "" +
-	"SELECT id FROM syncapi_output_room_events WHERE rowid = last_insert_rowid()"
-
 const selectEventsSQL = "" +
 	"SELECT id, event_json, session_id, exclude_from_sync, transaction_id FROM syncapi_output_room_events WHERE event_id = $1"
 
@@ -105,7 +102,6 @@ const selectStateInRangeSQL = "" +
 type outputRoomEventsStatements struct {
 	streamIDStatements            *streamIDStatements
 	insertEventStmt               *sql.Stmt
-	selectLastInsertedEventStmt   *sql.Stmt
 	selectEventsStmt              *sql.Stmt
 	selectMaxEventIDStmt          *sql.Stmt
 	selectRecentEventsStmt        *sql.Stmt
@@ -123,9 +119,6 @@ func (s *outputRoomEventsStatements) prepare(db *sql.DB, streamID *streamIDState
 	if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
 		return
 	}
-	if s.selectLastInsertedEventStmt, err = db.Prepare(selectLastInsertedEventSQL); err != nil {
-		return
-	}
 	if s.selectEventsStmt, err = db.Prepare(selectEventsSQL); err != nil {
 		return
 	}
@@ -270,7 +263,6 @@ func (s *outputRoomEventsStatements) insertEvent(
 	}
 
 	insertStmt := common.TxStmt(txn, s.insertEventStmt)
-	selectStmt := common.TxStmt(txn, s.selectLastInsertedEventStmt)
 	_, err = insertStmt.ExecContext(
 		ctx,
 		streamPos,
@@ -286,10 +278,6 @@ func (s *outputRoomEventsStatements) insertEvent(
 		txnID,
 		excludeFromSync,
 	)
-	if err != nil {
-		return
-	}
-	err = selectStmt.QueryRowContext(ctx).Scan(&streamPos)
 	return
 }
 
diff --git a/syncapi/storage/sqlite3/syncserver.go b/syncapi/storage/sqlite3/syncserver.go
index 8cfc1884f..6ad3419c7 100644
--- a/syncapi/storage/sqlite3/syncserver.go
+++ b/syncapi/storage/sqlite3/syncserver.go
@@ -193,24 +193,20 @@ func (d *SyncServerDatasource) WriteEvent(
 			ctx, txn, ev, addStateEventIDs, removeStateEventIDs, transactionID, excludeFromSync,
 		)
 		if err != nil {
-			fmt.Println("d.events.insertEvent:", err)
 			return err
 		}
 		pduPosition = pos
 
 		if err = d.topology.insertEventInTopology(ctx, txn, ev); err != nil {
-			fmt.Println("d.topology.insertEventInTopology:", err)
 			return err
 		}
 
 		if err = d.handleBackwardExtremities(ctx, txn, ev); err != nil {
-			fmt.Println("d.handleBackwardExtremities:", err)
 			return err
 		}
 
 		if len(addStateEvents) == 0 && len(removeStateEventIDs) == 0 {
 			// Nothing to do, the event may have just been a message event.
-			fmt.Println("nothing to do")
 			return nil
 		}
 
@@ -340,8 +336,12 @@ func (d *SyncServerDatasource) GetEventsInRange(
 }
 
 // SyncPosition returns the latest positions for syncing.
-func (d *SyncServerDatasource) SyncPosition(ctx context.Context) (types.PaginationToken, error) {
-	return d.syncPositionTx(ctx, nil)
+func (d *SyncServerDatasource) SyncPosition(ctx context.Context) (tok types.PaginationToken, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		tok, err = d.syncPositionTx(ctx, txn)
+		return err
+	})
+	return
 }
 
 // BackwardExtremitiesForRoom returns the event IDs of all of the backward
@@ -380,8 +380,12 @@ func (d *SyncServerDatasource) EventPositionInTopology(
 }
 
 // SyncStreamPosition returns the latest position in the sync stream. Returns 0 if there are no events yet.
-func (d *SyncServerDatasource) SyncStreamPosition(ctx context.Context) (types.StreamPosition, error) {
-	return d.syncStreamPositionTx(ctx, nil)
+func (d *SyncServerDatasource) SyncStreamPosition(ctx context.Context) (pos types.StreamPosition, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		pos, err = d.syncStreamPositionTx(ctx, txn)
+		return err
+	})
+	return
 }
 
 func (d *SyncServerDatasource) syncStreamPositionTx(
@@ -625,18 +629,15 @@ func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
 	if err != nil {
 		return
 	}
-	fmt.Println("Joined rooms:", joinedRoomIDs)
 
 	stateFilterPart := gomatrixserverlib.DefaultStateFilter() // TODO: use filter provided in request
 
 	// Build up a /sync response. Add joined rooms.
 	for _, roomID := range joinedRoomIDs {
-		fmt.Println("WE'RE ON", roomID)
 
 		var stateEvents []gomatrixserverlib.Event
 		stateEvents, err = d.roomstate.selectCurrentState(ctx, txn, roomID, &stateFilterPart)
 		if err != nil {
-			fmt.Println("d.roomstate.selectCurrentState:", err)
 			return
 		}
 		//fmt.Println("State events:", stateEvents)
@@ -648,7 +649,6 @@ func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
 			numRecentEventsPerRoom, true, true,
 		)
 		if err != nil {
-			fmt.Println("d.events.selectRecentEvents:", err)
 			return
 		}
 		//fmt.Println("Recent stream events:", recentStreamEvents)
@@ -658,10 +658,9 @@ func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
 		var backwardTopologyPos types.StreamPosition
 		backwardTopologyPos, err = d.topology.selectPositionInTopology(ctx, txn, recentStreamEvents[0].EventID())
 		if err != nil {
-			fmt.Println("d.topology.selectPositionInTopology:", err)
 			return nil, types.PaginationToken{}, []string{}, err
 		}
-		fmt.Println("Backward topology position:", backwardTopologyPos)
+
 		if backwardTopologyPos-1 <= 0 {
 			backwardTopologyPos = types.StreamPosition(1)
 		} else {
@@ -683,7 +682,6 @@ func (d *SyncServerDatasource) getResponseWithPDUsForCompleteSync(
 	}
 
 	if err = d.addInvitesToResponse(ctx, txn, userID, 0, toPos.PDUPosition, res); err != nil {
-		fmt.Println("d.addInvitesToResponse:", err)
 		return
 	}
 
@@ -744,18 +742,10 @@ func (d *SyncServerDatasource) GetAccountDataInRange(
 func (d *SyncServerDatasource) UpsertAccountData(
 	ctx context.Context, userID, roomID, dataType string,
 ) (sp types.StreamPosition, err error) {
-	txn, err := d.db.BeginTx(ctx, nil)
-	if err != nil {
-		return types.StreamPosition(0), err
-	}
-	var succeeded bool
-	defer func() {
-		txerr := common.EndTransaction(txn, &succeeded)
-		if err == nil && txerr != nil {
-			err = txerr
-		}
-	}()
-	sp, err = d.accountData.insertAccountData(ctx, txn, userID, roomID, dataType)
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		sp, err = d.accountData.insertAccountData(ctx, txn, userID, roomID, dataType)
+		return err
+	})
 	return
 }
 
@@ -764,8 +754,15 @@ func (d *SyncServerDatasource) UpsertAccountData(
 // Returns an error if there was a problem communicating with the database.
 func (d *SyncServerDatasource) AddInviteEvent(
 	ctx context.Context, inviteEvent gomatrixserverlib.Event,
-) (types.StreamPosition, error) {
-	return d.invites.insertInviteEvent(ctx, inviteEvent)
+) (streamPos types.StreamPosition, err error) {
+	err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
+		streamPos, err = d.streamID.nextStreamID(ctx, txn)
+		if err != nil {
+			return err
+		}
+		return d.invites.insertInviteEvent(ctx, txn, inviteEvent, streamPos)
+	})
+	return
 }
 
 // RetireInviteEvent removes an old invite event from the database.
diff --git a/sytest-whitelist b/sytest-whitelist
index 47fd58286..eb91b3f0c 100644
--- a/sytest-whitelist
+++ b/sytest-whitelist
@@ -183,7 +183,6 @@ GET /directory/room/:room_alias yields room ID
 PUT /directory/room/:room_alias creates alias
 Room aliases can contain Unicode
 Creators can delete alias
-Alias creators can delete canonical alias with no ops
 Regular users cannot create room aliases within the AS namespace
 Deleting a non-existent alias should return a 404
 Users can't delete other's aliases