message: Use '*' for global, as null is not a unique value
diff: @@ -432,6 +432,7 @@ export class PgDataStore implements DataStore {
  }
  public async getIpv6Counter(server: IrcServer, homeserver: string|null): Promise<number> {
  + homeserver = homeserver || "*";
  const res = await this.pgPool.query(
  "SELECT count FROM ipv6_counter WHERE server = $1 AND homeserver = $2",
  [server.domain, homeserver]
  @@ -449,7 +450,7 @@ export class PgDataStore implements DataStore {
  "server"
  ],
  ),
  - [counter, server.domain, homeserver],
  + [counter, server.domain, homeserver || "*"],
  );
  }
  