Limit database connections (#980, #564) (#998)

* Limit database connections (#564)

- Add new options to the config file database:
      max_open_conns: 100
      max_idle_conns: 2
      conn_max_lifetime: -1
- Implement connection parameter setup on the *DB (database/sql) in internal/sqlutil/trace.go:Open()
- Propagate the values in the form of DbProperties interface via all the
  Open() and NewDatabase() functions

Signed-off-by: Tomas Jirka <tomas.jirka@email.cz>

* Fix wasm builds

* Remove file accidentally added from working tree

Co-authored-by: Tomas Jirka <tomas.jirka@email.cz>

appservice/appservice.go

@@ -48,7 +48,7 @@ func SetupAppServiceAPIComponent(
 	transactionsCache *transactions.Cache,
 ) appserviceAPI.AppServiceQueryAPI {
 	// Create a connection to the appservice postgres DB
-	appserviceDB, err := storage.NewDatabase(string(base.Cfg.Database.AppService))
+	appserviceDB, err := storage.NewDatabase(string(base.Cfg.Database.AppService), base.Cfg.DbProperties())
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to appservice db")
 	}