teach synapse_port_db about new sequences

This makes sure we that the port script sets up the
"application_services_txns" sequence (matrix-org#12209). and the
"un_partial_stated_event_stream_sequence" sequence (matrix-org#14545), which fixes
errors like the one below from appearing when trying to connect to the
postgresql database after running the script:

    Postgres sequence 'application_services_txn_id_seq' is inconsistent with associated
    table 'application_services_txns'. This can happen if Synapse has been downgraded and
    then upgraded again, or due to a bad migration.

    To fix this error, shut down Synapse (including any and all workers)
    and run the following SQL:

        SELECT setval('application_services_txn_id_seq', (
            SELECT GREATEST(MAX(txn_id), 0) FROM application_services_txns
        ));

    See docs/postgres.md for more information.

Signed-off-by: Guacamolie <guac@amolie.nl>

changelog.d/15965.bugfix

@@ -0,0 +1 @@
+Fix `synapse_port_db` not configuring the `application_services_txns` and `un_partial_stated_event_stream_sequence` sequences. Contributed by @vanguacamolie.

synapse/_scripts/synapse_port_db.py

@@ -769,6 +769,10 @@ def alter_table(txn: LoggingTransaction) -> None:
             await self._setup_state_group_id_seq()
             await self._setup_user_id_seq()
             await self._setup_events_stream_seqs()
+            await self._setup_sequence(
+                "un_partial_stated_event_stream_sequence",
+                ("un_partial_stated_event_stream",),
+            )
             await self._setup_sequence(
                 "device_inbox_sequence", ("device_inbox", "device_federation_outbox")
             )
@@ -779,6 +783,7 @@ def alter_table(txn: LoggingTransaction) -> None:
             await self._setup_sequence("receipts_sequence", ("receipts_linearized",))
             await self._setup_sequence("presence_stream_sequence", ("presence_stream",))
             await self._setup_auth_chain_sequence()
+            await self._setup_application_services_sequence()
 
             # Step 3. Get tables.
             self.progress.set_state("Fetching tables")
@@ -1133,6 +1138,27 @@ def r(txn: LoggingTransaction) -> None:
                 r,
             )
 
+    async def _setup_application_services_sequence(self) -> None:
+        curr_tnx_id: Optional[
+            int
+        ] = await self.sqlite_store.db_pool.simple_select_one_onecol(
+            table="application_services_txns",
+            keyvalues={},
+            retcol="COALESCE(max(txn_id), 0)",
+        )
+
+        def r(txn: LoggingTransaction) -> None:
+            txn.execute(
+                "ALTER SEQUENCE application_services_txn_id_seq RESTART WITH %s",
+                (curr_tnx_id + 1,),
+            )
+
+        if curr_tnx_id is not None:
+            await self.postgres_store.db_pool.runInteraction(
+                "_setup_application_services_sequence",
+                r,
+            )
+
 
 ##############################################
 # The following is simply UI stuff