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Test connection to a database server.
Args:
db_type (str): Database type (mysql, mariadb, postgresql)
host (str): Database host
port (int): Database port
username (str): Database username
password (str): Database password
database (str): Database name
Returns:
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temp_file (str): Path to temporary file for backup
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Perform PostgreSQL backup using pg_dump with optimized parameters.
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