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v		cbt_platform audit_logs
log_id : bigint(20) unsigned
user_id : int(10) unsigned
action : varchar(100)
details : text
ip_address : varchar(45)
user_agent : varchar(255)
created_at : timestamp

v		cbt_platform categories
category_id : tinyint(3) unsigned
category_name : varchar(20)
created_at : timestamp

v		cbt_platform classes
class_id : int(10) unsigned
category_id : tinyint(3) unsigned
level_id : tinyint(3) unsigned
arm_id : tinyint(3) unsigned
created_at : timestamp

v		cbt_platform class_arms
arm_id : tinyint(3) unsigned
arm_name : varchar(5)
created_at : timestamp

v		cbt_platform class_levels
level_id : tinyint(3) unsigned
category_id : tinyint(3) unsigned
level_name : varchar(10)
created_at : timestamp

v		cbt_platform exam_attempts
attempt_id : int(10) unsigned
parameter_id : int(10) unsigned
student_id : int(10) unsigned
attempt_number : tinyint(3) unsigned
question_order : longtext
status : enum('in_progress','submitted','auto_submitted','suspended')
started_at : datetime
last_activity_at : datetime
submitted_at : datetime
time_remaining_seconds : int(10) unsigned
current_question_index : int(10) unsigned
ip_address : varchar(45)
device_info : varchar(255)

v		cbt_platform exam_parameters
parameter_id : int(10) unsigned
school_id : int(10) unsigned
session_id : int(10) unsigned
term_id : tinyint(3) unsigned
exam_type_id : tinyint(3) unsigned
class_id : int(10) unsigned
subject_id : int(10) unsigned
teacher_id : int(10) unsigned
question_mode : enum('own','class')
is_class_bank : tinyint(1)
duration_seconds : int(10) unsigned
total_questions : int(10) unsigned
pass_mark : decimal(5,2)
max_score : decimal(6,2)
randomize_questions : tinyint(1)
randomize_options : tinyint(1)
questions_locked : tinyint(1)
answers_locked : tinyint(1)
rewrite_allowed : tinyint(1)
max_attempts : tinyint(3) unsigned
result_visible : tinyint(1)
status : enum('draft','active','suspended','closed')
created_at : timestamp
updated_at : timestamp

v		cbt_platform exam_parameter_question_shares
id : int(10) unsigned
source_parameter_id : int(10) unsigned
target_parameter_id : int(10) unsigned
question_count : int(10) unsigned
created_at : timestamp

v		cbt_platform exam_parameter_shared_arms
id : int(10) unsigned
parameter_id : int(10) unsigned
class_id : int(10) unsigned
added_at : timestamp

v		cbt_platform exam_types
exam_type_id : tinyint(3) unsigned
type_name : varchar(30)
created_at : timestamp

v		cbt_platform exam_violations
violation_id : bigint(20) unsigned
attempt_id : int(10) unsigned
violation_type : enum('tab_switch','fullscreen_exit')
occurred_at : timestamp

v		cbt_platform login_attempts
attempt_id : bigint(20) unsigned
username : varchar(50)
ip_address : varchar(45)
success : tinyint(1)
attempted_at : timestamp

v		cbt_platform notifications
notification_id : int(10) unsigned
user_id : int(10) unsigned
title : varchar(150)
message : text
type : varchar(30)
is_read : tinyint(1)
created_at : timestamp

v		cbt_platform parameter_students
id : int(10) unsigned
parameter_id : int(10) unsigned
student_id : int(10) unsigned
assigned_by : int(10) unsigned
assigned_at : timestamp

v		cbt_platform parameter_student_rewrites
id : int(10) unsigned
parameter_id : int(10) unsigned
student_id : int(10) unsigned
granted_by : int(10) unsigned
granted_at : timestamp

v		cbt_platform passages
passage_id : int(10) unsigned
parameter_id : int(10) unsigned
title : varchar(150)
body : text
image_path : varchar(255)
created_at : timestamp

v		cbt_platform password_resets
reset_id : int(10) unsigned
user_id : int(10) unsigned
token_hash : varchar(255)
expires_at : datetime
used : tinyint(1)
created_at : timestamp

v		cbt_platform questions
question_id : int(10) unsigned
parameter_id : int(10) unsigned
passage_id : int(10) unsigned
question_text : text
question_image : varchar(255)
option_count : tinyint(3) unsigned
difficulty : enum('easy','medium','hard')
topic : varchar(100)
version : int(10) unsigned
is_active : tinyint(1)
sort_order : int(10) unsigned
created_at : timestamp
updated_at : timestamp

v		cbt_platform question_options
option_id : int(10) unsigned
question_id : int(10) unsigned
option_label : char(1)
option_text : text
option_image : varchar(255)
is_correct : tinyint(1)
sort_order : tinyint(3) unsigned
created_at : timestamp

v		cbt_platform question_solutions
solution_id : int(10) unsigned
question_id : int(10) unsigned
explanation : text
image_path : varchar(255)
video_url : varchar(255)
reference_url : varchar(255)
created_at : timestamp

v		cbt_platform results
result_id : int(10) unsigned
attempt_id : int(10) unsigned
parameter_id : int(10) unsigned
student_id : int(10) unsigned
total_questions : int(10) unsigned
correct_count : int(10) unsigned
wrong_count : int(10) unsigned
skipped_count : int(10) unsigned
score : decimal(6,2)
percentage : decimal(5,2)
grade : varchar(5)
remark : varchar(50)
passed : tinyint(1)
time_used_seconds : int(10) unsigned
class_rank : int(10) unsigned
created_at : timestamp

v		cbt_platform roles
role_id : tinyint(3) unsigned
role_name : varchar(30)
description : varchar(150)
created_at : timestamp

v		cbt_platform sessions_academic
session_id : int(10) unsigned
session_name : varchar(20)
is_current : tinyint(1)
created_at : timestamp

v		cbt_platform settings
setting_key : varchar(60)
setting_value : text
created_at : timestamp

v		cbt_platform student_answers
answer_id : int(10) unsigned
attempt_id : int(10) unsigned
question_id : int(10) unsigned
selected_option_id : int(10) unsigned
option_order : longtext
status : enum('answered','skipped','marked_review')
is_correct : tinyint(1)
answered_at : datetime

v		cbt_platform subjects
subject_id : int(10) unsigned
subject_name : varchar(100)
subject_code : varchar(20)
status : enum('active','inactive')
created_at : timestamp

v		cbt_platform teacher_subjects
id : int(10) unsigned
teacher_id : int(10) unsigned
subject_id : int(10) unsigned
class_id : int(10) unsigned
created_at : timestamp

v		cbt_platform terms
term_id : tinyint(3) unsigned
term_name : varchar(20)
created_at : timestamp

v		cbt_platform users
user_id : int(10) unsigned
school_id : int(10) unsigned
section : varchar(50)
role_id : tinyint(3) unsigned
surname : varchar(60)
first_name : varchar(60)
middle_name : varchar(60)
gender : enum('male','female')
admission_number : varchar(30)
staff_id : varchar(30)
username : varchar(50)
password_hash : varchar(255)
must_change_password : tinyint(1)
phone : varchar(20)
email : varchar(120)
class_id : int(10) unsigned
session_id : int(10) unsigned
photo_path : varchar(255)
status : enum('active','inactive','suspended','graduated','deleted')
last_login_at : datetime
last_login_ip : varchar(45)
created_at : timestamp
updated_at : timestamp

Create relationship
FOREIGN KEY
on delete
on update