Hi Community,

We are currently using Cassandra version 4.1.3 and have encountered an
issue related to tombstone generation. We have two tables storing monthly
data: table_september and table_october. Each table has a TTL of 30 days.

For the month of October, data is being inserted into the table_october,
and we are seeing the following warning at the start of the month:

*WARN  [CompactionExecutor:22030] 2024-10-07 16:37:16,376
BigTableWriter.java:274 - Writing 102594 tombstones to
**table_october*

*Here are a few things to note*:

   - No update or delete operations are being performed on the table.
   - TTL is correctly set to 30 days, and the data being inserted is within
   this time range, so the TTL shouldn't be the reason for tombstones.
   - No null values are being inserted in any column.

We are still seeing tombstones being generated for the October table. Does
anyone have insights into what could be causing these tombstones, or how we
can prevent this from happening?

Any help would be greatly appreciated!

Thanks in advance.

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