refactor: follow clippy recommendation :

- Remove unused constructor for Table & Column
- Add .expect in databases. disconnect
- Remove usedless String::from in column serializer

src/databases/mod.rs

@@ -1,4 +1,4 @@
-use rusqlite::{Connection, Result, Error};
+use rusqlite::{Connection, Result};
 
 pub fn connect(db_connection: String) -> Result<Connection> {
     Connection::open(db_connection)
@@ -8,6 +8,6 @@ pub fn run_command(connection: &Connection, sql: String) -> Result<usize> {
     connection.execute(sql.as_str(), [])
 }
 
-pub fn disconnect(connection: Connection) -> Result<(), (Connection, Error)> {
-    connection.close()
+pub fn disconnect(connection: Connection) {
+    connection.close().expect("Error closing sqlite connection");
 }