Fixed API issues and added a test file

database.sql

@@ -1,14 +1,14 @@
 SET default_storage_engine = InnoDB;
-DROP DATABASE IF EXISTS `hsp-gdh`;
-CREATE DATABASE IF NOT EXISTS `hsp-gdh`
+DROP DATABASE IF EXISTS `hsp_gdh`;
+CREATE DATABASE IF NOT EXISTS `hsp_gdh`
   CHARACTER SET utf8mb4
   COLLATE utf8mb4_unicode_ci;
 
-DROP USER IF EXISTS 'hsp-gdh';
-CREATE USER 'hsp-gdh'@'%' IDENTIFIED BY 'PASSWORD';
-GRANT ALL PRIVILEGES ON airjet.* TO 'hsp-gdh'@'%';
+DROP USER IF EXISTS 'hsp_gdh';
+CREATE USER 'hsp_gdh'@'%' IDENTIFIED BY 'PASSWORD';
+GRANT ALL PRIVILEGES ON hsp_gdh.* TO 'hsp_gdh'@'%';
 
-USE `hsp-gdh`;
+USE `hsp_gdh`;
 
 CREATE TABLE roles (
   id INT UNSIGNED NOT NULL AUTO_INCREMENT,
@@ -189,6 +189,7 @@ CREATE TABLE rooms (
     REFERENCES hospitals(id)
     ON DELETE RESTRICT
     ON UPDATE CASCADE,
+  INDEX ch_hospital_id_idx (hospital_id)
 ) ENGINE=InnoDB;
 
 CREATE TABLE hospital_doctors (