Normalize username and email to lowercase on user forms

User creation and editing now convert usernames and emails to lowercase in frontend forms and backend logic to ensure consistency and prevent duplicate accounts with case variations. Birthdate is also converted to ISO format during migration for data uniformity.

backend/app/migrations/migration_6.py

@@ -27,6 +27,8 @@ def process_migration_6(db: Session):
         for user in users:
             try:
                 user.username = user.username.lower()
+                if user.birthdate:
+                    user.birthdate = user.birthdate.isoformat()
                 user_converted = users_schema.UserRead.model_validate(user)
 
                 user_crud.edit_user(user.id, user_converted, db)

backend/app/users/user/crud.py

@@ -345,6 +345,8 @@ def edit_user(user_id: int, user: users_schema.UserRead, db: Session):
             # Delete the user photo in the filesystem
             users_utils.delete_user_photo_filesystem(db_user.id)
 
+        user.username = user.username.lower()
+
         # Dictionary of the fields to update if they are not None
         user_data = user.model_dump(exclude_unset=True)
         # Iterate over the fields and update the db_user dynamically

frontend/app/src/components/Settings/SettingsUsersZone/UsersAddEditUserModalComponent.vue

@@ -637,8 +637,8 @@ async function submitAddUserForm() {
     if (isPasswordValid.value) {
       const data = {
         name: newEditUserName.value,
-        username: newEditUserUsername.value,
-        email: newEditUserEmail.value,
+        username: newEditUserUsername.value.toLowerCase(),
+        email: newEditUserEmail.value.toLowerCase(),
         city: newEditUserCity.value,
         birthdate: newEditUserBirthDate.value,
         preferred_language: newEditUserPreferredLanguage.value,
@@ -680,9 +680,9 @@ async function submitEditUserForm() {
   try {
     const data = {
       id: props.user.id,
-      username: newEditUserUsername.value,
+      username: newEditUserUsername.value.toLowerCase(),
       name: newEditUserName.value,
-      email: newEditUserEmail.value,
+      email: newEditUserEmail.value.toLowerCase(),
       city: newEditUserCity.value,
       birthdate: newEditUserBirthDate.value,
       gender: newEditUserGender.value,

frontend/app/src/views/SignUpView.vue

@@ -370,8 +370,8 @@ const submitForm = async () => {
     // Prepare data for submission
     const data = {
       name: signUpName.value,
-      username: signUpUsername.value,
-      email: signUpEmail.value,
+      username: signUpUsername.value.toLowerCase(),
+      email: signUpEmail.value.toLowerCase(),
       password: signUpPassword.value,
       preferred_language: signUpPreferredLanguage.value,
       city: signUpCity.value || null,