diff --git a/.buildkite/postgres-config.yaml b/.buildkite/postgres-config.yaml
index a35fec394d..2acbe66f4c 100644
--- a/.buildkite/postgres-config.yaml
+++ b/.buildkite/postgres-config.yaml
@@ -1,7 +1,7 @@
 # Configuration file used for testing the 'synapse_port_db' script.
 # Tells the script to connect to the postgresql database that will be available in the
 # CI's Docker setup at the point where this file is considered.
-server_name: "test"
+server_name: "localhost:8800"
 
 signing_key_path: "/src/.buildkite/test.signing.key"
 
diff --git a/.buildkite/sqlite-config.yaml b/.buildkite/sqlite-config.yaml
index 635b921764..6d9bf80d84 100644
--- a/.buildkite/sqlite-config.yaml
+++ b/.buildkite/sqlite-config.yaml
@@ -1,7 +1,7 @@
 # Configuration file used for testing the 'synapse_port_db' script.
 # Tells the 'update_database' script to connect to the test SQLite database to upgrade its
 # schema and run background updates on it.
-server_name: "test"
+server_name: "localhost:8800"
 
 signing_key_path: "/src/.buildkite/test.signing.key"
 
diff --git a/scripts/synapse_port_db b/scripts/synapse_port_db
index 72061177c9..e393a9b2f7 100755
--- a/scripts/synapse_port_db
+++ b/scripts/synapse_port_db
@@ -55,6 +55,7 @@ from synapse.storage.data_stores.main.stats import StatsStore
 from synapse.storage.data_stores.main.user_directory import (
     UserDirectoryBackgroundUpdateStore,
 )
+from synapse.storage.database import Database
 from synapse.storage.engines import create_engine
 from synapse.storage.prepare_database import prepare_database
 from synapse.util import Clock
@@ -139,39 +140,6 @@ class Store(
     UserDirectoryBackgroundUpdateStore,
     StatsStore,
 ):
-    def __init__(self, db_conn, hs):
-        super().__init__(db_conn, hs)
-        self.db_pool = hs.get_db_pool()
-
-    @defer.inlineCallbacks
-    def runInteraction(self, desc, func, *args, **kwargs):
-        def r(conn):
-            try:
-                i = 0
-                N = 5
-                while True:
-                    try:
-                        txn = conn.cursor()
-                        return func(
-                            LoggingTransaction(txn, desc, self.database_engine, [], []),
-                            *args,
-                            **kwargs
-                        )
-                    except self.database_engine.module.DatabaseError as e:
-                        if self.database_engine.is_deadlock(e):
-                            logger.warning("[TXN DEADLOCK] {%s} %d/%d", desc, i, N)
-                            if i < N:
-                                i += 1
-                                conn.rollback()
-                                continue
-                        raise
-            except Exception as e:
-                logger.debug("[TXN FAIL] {%s} %s", desc, e)
-                raise
-
-        with PreserveLoggingContext():
-            return (yield self.db_pool.runWithConnection(r))
-
     def execute(self, f, *args, **kwargs):
         return self.db.runInteraction(f.__name__, f, *args, **kwargs)
 
@@ -512,7 +480,7 @@ class Porter(object):
 
         hs = MockHomeserver(self.hs_config, engine, conn, db_pool)
 
-        store = Store(conn, hs)
+        store = Store(Database(hs), conn, hs)
 
         yield store.db.runInteraction(
             "%s_engine.check_database" % config["name"], engine.check_database,
diff --git a/synapse/storage/data_stores/main/__init__.py b/synapse/storage/data_stores/main/__init__.py
index 66f8a9f3a7..c577c0df5f 100644
--- a/synapse/storage/data_stores/main/__init__.py
+++ b/synapse/storage/data_stores/main/__init__.py
@@ -124,7 +124,7 @@ class DataStore(
             raise Exception(
                 "Found users in database not native to %s!\n"
                 "You cannot changed a synapse server_name after it's been configured"
-                % (self.hostname,)
+                % (hs.hostname,)
             )
 
         self._stream_id_gen = StreamIdGenerator(