Please create a config.toml into system config path:
Path example:
(Linux) /home/alice/.config/sqlui/config.toml
(Windows) C:\Users\Alice\AppData\Roaming\sqlui\config.toml
(Mac) /Users/Alice/Library/Application Support/sqlui/config.toml
config.toml example
[[endpoints]]
name = "employees"
connection_string = "mysql://root:college@localhost:3366/employees"
[[endpoints]]
name = "world"
connection_string = "mysql://root:local@localhost:3356/world"