What level of transaction isolation would be suitable in this case?

The choice of transaction isolation level depends on data consistency requirements and performance. In Go, when working with databases through drivers, standard isolation levels are usually used, such as:

• Read Uncommitted
• Read Committed
• Repeatable Read
• Serializable

If maximum integrity and prevention of phantom reads are needed, choose Serializable, but this reduces performance due to locking.

If some anomalies are acceptable but high performance is important, Read Committed can be used.

Example using database/sql:

import (
    "database/sql"
    _ "github.com/lib/pq"
)

func doTransaction(db *sql.DB) error {
    tx, err := db.BeginTx(context.Background(), &sql.TxOptions{
        Isolation: sql.LevelSerializable,
    })
    if err != nil {
        return err
    }
    // operations with tx
    return tx.Commit()
}

Choose the isolation level based on specific requirements for consistency and load.