What are the limits and allowed characters for Database name, Database user name and password when adding a new database at
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Database name - up to 63 alphanumeric characters. Underscore and dash are also allowed. One needs to take into account this manual page
Database user - up to 16 alphanumeric characters. Underscore and dash are also allowed.
Password length and allowed characters depend on the server Security Policy set at
Home > Tools & Settings > Security Policy > Password strength