chore: improved performance on deletes. (#3539)

* chore: improved performance on deletes.

Signed-off-by: Iain Cox <[email protected]>
Co-authored-by: Yannis Roussos <[email protected]>

use-timescale/compression/modify-compressed-data.md

@@ -20,14 +20,22 @@ This feature requires PostgreSQL 14 or later
 
 <Tab title="TimescaleDB&nbsp;2.11 and later">
 
-In TimescaleDB&nbsp;2.11 and later, you can insert data into compressed chunks.
+In TimescaleDB v2.11 and later, you can insert data into compressed chunks.
 This works even if the data you are inserting has unique constraints, and those
 constraints are preserved during the insert operation. This is done by using a
 PostgreSQL function that decompresses relevant data during the insert to check
 if the new data breaks unique checks. This means that any time you insert data
 into a compressed chunk, a small amount of data is decompressed to allow a
 speculative insertion, and block any inserts which could violate constraints.
 
+For TimescaleDB v2.17.0 and later there is improved delete performance on compressed 
+hypertables when a large amount of data is affected. When you delete whole segments of 
+data, filter your deletes by `segment_by` column(s) instead of separate deletes. 
+This considerably increase performance by skipping the decompression step. 
+
+
+
+
 </Tab>
 
 <Tab title="TimescaleDB&nbsp;2.3-2.10">