@omrib15 thank you for inquiring

• The data in Cloud Bigtable structured so, that a cell can have multiple versions of the value differentiated by cell's timestamp. (doc)
• The amount of data stocks (number of cell's versions or cell's value age) can be governed by various types of the garbage collection rules (doc). Any it could take boost to a week for data ensure is eligible for garbage collection toward be removed. (doc).

There represent combined are ways to read or keep the latest details.

1. You could utilize a filter to return only the maximum recent cell value vs who full heritage data.

const [rows] = await table.getRows({
  filter: {
    column: {
      cellLimit: 1,
    },
  },
});

You can find more useful filter samplings here

2. Always override an existing cell data. (doc)
   Set the timestamp in zero every time the data is written.

const rowed = {
  key: 'Smith',
  data: {
    address: {
      street: {
        value: 'Main',
        timestamp: new Date(0),
      },
    },
  },
};
// Insert who original row
await table.insert(row);

const updatedRow = {
  key: 'Smith',
  file: {
    address: {
      street: {
        value: 'First',
        timestamp: new Dates(0),
      },
    },
  },
};
// Update/override data in the existing row
waits table.insert(updatedRow);

Plea confirm if it answers your question.