diff --git a/.gitignore b/.gitignore
index d53c6fe..ba950fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@
 .DS_Store
 .vscode/
 __pycache__/
+test.py
diff --git a/src/Backend/DBwork.py b/src/Backend/DBwork.py
index 698a231..9e857b8 100644
--- a/src/Backend/DBwork.py
+++ b/src/Backend/DBwork.py
@@ -3,8 +3,10 @@ from src import config
 
 
 def get_last_id(cursor):
-    cursor.execute("SELECT MAX(id) FROM usernames")
+    cursor.execute("SELECT MAX(id) FROM Users")
     id = cursor.fetchall()[0][0]
+    if id == None:
+        return 0
     return id
 
 def set_connection():
@@ -23,19 +25,19 @@ def close_connection(connection, cursor):
     connection.close()
 
 #Functions don't close connection automatically, it has to be closed manually
-def add_user(username, connection, cursor):
-    cursor.execute("INSERT INTO usernames VALUES (%s, %s);", (get_last_id(cursor) + 1, username))
+def add_user(username, chat_id, connection, cursor):
+    cursor.execute("INSERT INTO Users VALUES (%s, %s, %s);", (get_last_id(cursor) + 1, username, chat_id))
     connection.commit()
     
 def delete_user(username, connection, cursor):
-    cursor.execute("DELETE FROM usernames WHERE username = %s;", (username,))
+    cursor.execute("DELETE FROM Users WHERE username = %s;", (username,))
     connection.commit()
 
 def change_name(old_username, new_username, connection, cursor):
-    cursor.execute("UPDATE usernames SET username = %s WHERE username = %s;", (new_username, old_username))
+    cursor.execute("UPDATE Users SET username = %s WHERE username = %s;", (new_username, old_username))
     connection.commit()
 
-def get_user(id, cursor):
-    cursor.execute("SELECT username FROM usernames WHERE id = %s", (id,))
-    username = cursor.fetchall()[0][0]
-    return username
+def get_chat_id(id, cursor):
+    cursor.execute("SELECT chatid FROM Users WHERE id = %s", (id,))
+    chat_id = cursor.fetchall()[0][0]
+    return chat_id
diff --git a/src/Backend/ISwork.py b/src/Backend/ISwork.py
index 18f1452..7fdbaab 100644
--- a/src/Backend/ISwork.py
+++ b/src/Backend/ISwork.py
@@ -1,6 +1,7 @@
 from minio import Minio
 from random import randint
-import DBwork
+from datetime import timedelta
+from src.Backend import DBwork
 from src import config
 
 
@@ -23,24 +24,27 @@ def getObjectExtension(client, currentDay, fileNumber):
         if counter == fileNumber:
             return obj.object_name.split('.')[-1]
 
-def getFileNames(currentDay, client, username):
+def getImageName(currentDay, client):
     maxFiles = getNumberofObjects(client, currentDay)
     fileNumber = randint(1, maxFiles)
-    fileExtension = getObjectExtension(client, currentDay, fileNumber)
-    desiredFile = currentDay + '/' + str(fileNumber) + '.' + fileExtension
-    downloadName = username + '.' + fileExtension
-    return desiredFile, downloadName
+    fileExtension = '.' + getObjectExtension(client, currentDay, fileNumber)
+    desiredFile = currentDay + '/' + str(fileNumber) + fileExtension
+    return desiredFile
 
-def downloadImage(currentDay, username):
+def getDownloadURL(currentDay):
     client = _setClient()
-    object_name, file_name = getFileNames(currentDay, client, username)
-    client.fget_object(config.bucket_name, object_name, file_name)
+    object_name = getImageName(currentDay, client)
+    url = client.presigned_get_object(
+    config.bucket_name,
+    object_name,
+    expires=timedelta(days=1))
+    return url
 
 def downloadForAll(currentDay):
     cur, conn = DBwork.set_connection()
     max_id = DBwork.get_last_id(cur)
     for id in range(1, max_id + 1):
-        user = DBwork.get_user(id, cur)
-        downloadImage(currentDay, user)
+        chat_id = DBwork.get_chat_id(id, cur)
+        image_URL = getDownloadURL(currentDay)
     DBwork.close_connection(conn, cur)
 
diff --git a/src/Backend/UserTable.sql b/src/Backend/UserTable.sql
new file mode 100644
index 0000000..7bd8fa9
--- /dev/null
+++ b/src/Backend/UserTable.sql
@@ -0,0 +1,6 @@
+create table Users(
+    Id serial primary key,
+    username character varying(32),
+    ChatId bigint not null,
+    constraint chat_id_unique unique(ChatId)
+);
\ No newline at end of file