refactored for maintainability

internal/db/user.go

@@ -112,19 +112,6 @@ func GetUserByDiscordID(ctx context.Context, tx bun.Tx, discordID string) (*User
 	return user, nil
 }
 
-// IsUsernameUnique checks if the given username is unique (not already taken)
-// Returns true if the username is available, false if it's taken
-func IsUsernameUnique(ctx context.Context, tx bun.Tx, username string) (bool, error) {
-	count, err := tx.NewSelect().
-		Model((*User)(nil)).
-		Where("username = ?", username).
-		Count(ctx)
-	if err != nil {
-		return false, errors.Wrap(err, "tx.NewSelect")
-	}
-	return count == 0, nil
-}
-
 // GetRoles loads all the roles for this user
 func (u *User) GetRoles(ctx context.Context, tx bun.Tx) ([]*Role, error) {
 	if u == nil {