Close database connection when finished with it

lib/Class.js

@@ -81,6 +81,8 @@ class Class {
 				classId
 			]);
 
+			conn.close();
+
 			this.teacherIds = ids.map(record => record.id);
 
 			const [ teachers, subject ] = await Promise.all([

lib/PasswordReset.js

@@ -32,6 +32,8 @@ class PasswordReset {
 				token
 			]);
 
+			conn.close();
+
 			if (!record.length)
 				throw new Error('No password reset found');
 
@@ -69,6 +71,8 @@ class PasswordReset {
 
 		await conn.runQuery(sql, [ u.id ]);
 
+		conn.close();
+
 		const [ nonce, token ] = await PasswordReset.hashToken(u);
 
 		const d = new Date();

lib/Subject.js

@@ -35,6 +35,8 @@ class Subject {
 				subjectId,
 			]);
 
+			conn.close();
+
 			if (!record.length)
 				throw new Error('No subject found');
 

lib/Test.js

@@ -83,6 +83,8 @@ class Test {
 				testId,
 			]);
 
+			conn.close();
+
 			if (!record.length)
 				throw new Error('No test found');
 

lib/TestTemplate.js

@@ -59,6 +59,8 @@ class TestTemplate {
 				testTemplateId,
 			]);
 
+			conn.close();
+
 			if (!record.length)
 				throw new Error('No test template found');
 

lib/User.js

@@ -50,6 +50,8 @@ class User {
 				const res =
 					await conn.runQuery(sql, [ userId ]);
 
+				conn.close();
+
 				if (!res.length)
 					continue;