In what cases is it advisable to use Event Sourcing for data storage?

Event Sourcing is an approach to data storage where not the current states of objects are stored, but the sequence of events that led to that state.

It is advisable to apply Event Sourcing in cases:

• When a complete history of data changes and auditability are important.
• When there is a need to rollback to previous states or replay events.
• In systems with high complexity of business logic, where tracking every change is important.
• To implement CQRS (Command Query Responsibility Segregation), where commands and queries are processed separately.

For example, in banking applications, where it is important to store all transactions, not just the current balance.

Disadvantages: implementation complexity and the need to manage a large number of events.