Sqlite3 not inserting values into the database - sql

Question

I have made a program allows a user to manipulate a database, I have a part where the user can add multiple entries into a certain database (anywhere between 1 to 10 entries) I have created another program (below) that I use to "reset" the database, using similar principles to what my main program does.
import sqlite3, time
schoolDBConn = sqlite3.connect("SCHOOL_DB.db")
schoolDBCursor = schoolDBConn.cursor()
schoolDBCursor.execute(
"""
CREATE TABLE IF NOT EXISTS USER_DETAILS
(
username text,
password text,
clearance int,
classes int
)
"""
)
schoolDBCursor.execute("SELECT * FROM USER_DETAILS")
print(schoolDBCursor.fetchall())
if input("Delete all user_details?").upper() == "Y":
schoolDBCursor.execute("DELETE FROM USER_DETAILS")
if input("add items to user_details?").upper() == "Y":
user_list = [("foo","bar",3,0),("bar","foo",3,0),("Terri","Pass",2,0),
("Chris","Pass",2,0),("Tony","Pass",2,0),("Emma","Pass",2,0),
("Thomas","Pass",1,0),("Penny","Pass",1,0),("Kamryn","Pass",1,0),
("Kelsie","Pass",1,0),("James","Pass",1,0),("Connor","Pass",1,0),
("Steve","Pass",1,0),("Bob","Pass",2,0),("Elon","Pass",1,0)]
for i in user_list:
schoolDBCursor.execute("""INSERT INTO USER_DETAILS VALUES (?,?,?,?)""",
(i[0],i[1],i[2],i[3]))
schoolDBCursor.execute("SELECT * FROM USER_DETAILS")
print(schoolDBCursor.fetchall())
If I run this function, all the items in the existing database are printed, then if I choose to only delete what exists in the database, the print function returns nothing. If I choose to delete and then "add" the items to the database, the print function returns the items I added
However, when I re-run the program, the first print statement returns the original items in the database (not the deleted table, or the items in the users_list) and this is of course not helpful.
My main program is affected by this too, and it causes problems as I need data to be updated quickly.
I also use an application "SQlite manager" to view my tables, and they do not update in that either

Answer 1

Turns out I did not commit the data, I had to do:
schoolDBConn.commit()
or
with schoolDBConn: