add: added channel purge button

back/libs/mysql.js

@@ -280,6 +280,21 @@ function deleteMessage(connection, message_id) {
   });
 }
 
+function deleteChannelMessages(connection, channel_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `DELETE FROM messages WHERE channel_id = ?`,
+      [channel_id], // Use parameterized query
+      (error, result) => {
+        if (error) {
+          reject(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
 function addMention(connection, message_id, user_id) {
   return new Promise((resolve, reject) => {
     connection.query(
@@ -327,6 +342,22 @@ function deleMentions(connection, message_id) {
   });
 }
 
+function deleteChannelMentions(connection, channel_id) {
+  return new Promise((resolve, reject) => {
+    connection.query(
+      `DELETE FROM mentions WHERE message_id IN 
+       (SELECT id FROM messages WHERE channel_id = ?)`,
+      [channel_id], // Use parameterized query
+      (error, result) => {
+        if (error) {
+          reject(new Error(error));
+        }
+        resolve(result);
+      }
+    );
+  });
+}
+
 module.exports = {
   getConnection,
   getUser,
@@ -345,7 +376,9 @@ module.exports = {
   getMessage,
   addMessage,
   deleteMessage,
+  deleteChannelMessages,
   addMention,
   getMentions,
   deleMentions,
+  deleteChannelMentions,
 };