Scala, Slick :too many clients already - scala

Question

ive come across this problem :
Caused by: org.postgresql.util.PSQLException: FATAL: sorry, too many clients already
The app works, but i can only make like 3 or 4 requests and then im getting this error, so whats happening (im guessing) is im creating new connections per request and id like to keep one connection per app lifecycle, any idea how to modify the code to do so?
Tried injecting UsersDao to my controller instead of using it as an object but that changes nothing
Im really new to scala so any help is appreciated
Dao
import config.DatabaseConfig
import domain.{User, UsersTable}
import slick.jdbc.PostgresProfile.api._
import slick.sql.SqlAction
import scala.concurrent.Future
trait BaseDao extends DatabaseConfig {
val usersTable = TableQuery[UsersTable]
protected implicit def executeFromDb[A](action: SqlAction[A, NoStream, _ <: slick.dbio.Effect]): Future[A] = {
println(db)
db.run(action)
}
}
object UsersDao extends BaseDao {
def findAll: Future[Seq[User]] = usersTable.result
def create(user: User): Future[Long] = usersTable.returning(usersTable.map(_.id)) += user
def findByFirstName(firstName: String): Future[Seq[User]] = usersTable.filter(_.firstName === firstName).result
def findById(userId: Long): Future[User] = usersTable.filter(_.id === userId).result.head
def delete(userId: Long): Future[Int] = usersTable.filter(_.id === userId).delete
}
DatabaseConfig
trait DatabaseConfig extends Config {
val driver = slick.jdbc.PostgresProfile
import driver.api._
def db = Database.forConfig("dbname")
implicit val session: Session = db.createSession()
}
Controller
import domain.User
import javax.inject.{Inject, Singleton}
import play.api.libs.json.Json
import play.api.mvc._
import repository.UsersDao
import scala.concurrent.{ExecutionContext, Future}
#Singleton
class UserController #Inject() ()(cc: ControllerComponents, parsers: PlayBodyParsers)(implicit exec: ExecutionContext) extends AbstractController(cc) {
def addUser = Action.async(parse.json[User]) { req => {
UsersDao.create(req.body).map({ user =>
Ok(Json.toJson(user))
})
}
}