timescale · surister · Jul 28, 2026 · Jul 21, 2026 · Jul 21, 2026 · Jul 21, 2026
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@@ -2,6 +2,72 @@
 
 **Please note: When updating your database, you should connect using `psql` with the `-X` flag to prevent any `.psqlrc` commands from accidentally triggering the load of a previous TimescaleDB version.**
 
+## 2.29.0 (2026-07-28)
+
+This release contains performance improvements and bug fixes since the 2.28.3 release. We recommend that you upgrade at the next available opportunity.
+
+**Release Highlights**
+* **Chunk exclusion for DML operations** drastically improves the performance of `UPDATE` and `DELETE` statements on hypertables. By acquiring exclusive locks only on the specific chunks being modified rather than the entire hypertable, this enhancement eliminates massive lock contention and keeps high-concurrency workloads running smoothly without unnecessary slowdowns.
+* Intelligent **row-by-row decompression** enables the query planner to decompress data row-by-row rather than in large batches when an operation prioritizes a fast initial response (such as queries with `LIMIT` clauses). This dramatically reduces memory overhead and query latency, ensuring lightning-fast performance when you only need to retrieve a small subset of records from your compressed hypertables.
+
+**Important: PostgreSQL 15 Support Removed**
+TimescaleDB 2.29.0 removes support for PostgreSQL 15. This release supports PostgreSQL 16, 17, and 18. If you are still running PostgreSQL 15, upgrade PostgreSQL before upgrading to TimescaleDB 2.29.0.
+
+**Backward-Incompatible Changes**
+* [#10041](https://github.com/timescale/timescaledb/pull/10041) Remove support for PostgreSQL 15
+
+**Features**
+* [#9315](https://github.com/timescale/timescaledb/pull/9315) Speed up `DML` operations on hypertables by using the optimized TimescaleDB hypertable expansion code instead of the generic PostgreSQL inheritance hierarchy expansion
+* [#9534](https://github.com/timescale/timescaledb/pull/9534) Speed up expression evaluation in the columnar pipeline by caching common subexpressions
+* [#9684](https://github.com/timescale/timescaledb/pull/9684) Add `_timescaledb_functions.decompress_batch()` SQL function
+* [#9732](https://github.com/timescale/timescaledb/pull/9732) Speed up some queries with small `LIMIT` by switching to row-by-row query execution pipeline
+* [#9917](https://github.com/timescale/timescaledb/pull/9917) Decompress less data in `DML` on compressed hypertables by accounting for prepared statement parameters
+* [#9957](https://github.com/timescale/timescaledb/pull/9957) Add `compact_chunk()` function
+* [#10048](https://github.com/timescale/timescaledb/pull/10048) Support concurrent refresh policies on hierarchical continuous aggregates
+* [#10081](https://github.com/timescale/timescaledb/pull/10081) Add `samplerate` argument to `_timescaledb_functions.estimate_uncompressed_size()`
+* [#10100](https://github.com/timescale/timescaledb/pull/10100) Skip classifying compressed relations to speed up planning
+* [#10118](https://github.com/timescale/timescaledb/pull/10118) Don't track compressed relations as separate chunk
+* [#10119](https://github.com/timescale/timescaledb/pull/10119) Reduce memory usage of `INSERT` queries using direct compress and spanning multiple chunks
+* [#10163](https://github.com/timescale/timescaledb/pull/10163) Add a compaction policy for unordered chunks
+* [#10204](https://github.com/timescale/timescaledb/pull/10204) Don't create separate hypertable catalog entry for hypertables with compression
+* [#10217](https://github.com/timescale/timescaledb/pull/10217) Initial placeholder version of granular refresh API
+* [#10225](https://github.com/timescale/timescaledb/pull/10225) Add `config_merge` parameter to `alter_job()` for merging `jsonb` into the existing job configuration
+* [#10226](https://github.com/timescale/timescaledb/pull/10226) Add `recompress_unordered` columnstore policy option
+* [#10231](https://github.com/timescale/timescaledb/pull/10231) Use `regclass` for storing relation reference in chunk table
+* [#10237](https://github.com/timescale/timescaledb/pull/10237) Add helper functions for decoding hypertable status
+* [#10240](https://github.com/timescale/timescaledb/pull/10240) Add the `tsdb.direct_compress` storage parameter that allows enabling direct compress for a given hypertable independent of global settings
+* [#10266](https://github.com/timescale/timescaledb/pull/10266) Add `max_batches` to `compact_chunk()`
+* [#10299](https://github.com/timescale/timescaledb/pull/10299) Add `continuous_aggs_tenant_tracking` and `hypertable_cagg_settings` catalogs
+
+**Bugfixes**
+* [#10013](https://github.com/timescale/timescaledb/pull/10013) Make ownership error messages on continuous aggregates consistent
+* [#10052](https://github.com/timescale/timescaledb/pull/10052) Result of `MIN` / `MAX` aggregate functions in columnar aggregation pipeline possibly inconsistent with plain PostgreSQL result
+* [#10071](https://github.com/timescale/timescaledb/pull/10071) Prune the real-time branch of hierarchical continuous aggregates at any nesting depth
+* [#10143](https://github.com/timescale/timescaledb/pull/10143) Fix division by zero when planning `time_bucket` with zero width
+* [#10199](https://github.com/timescale/timescaledb/pull/10199) Fix `initial_start` handling in `build_job_info`
+* [#10213](https://github.com/timescale/timescaledb/pull/10213) Cache sort pathkeys per hypertable
+* [#10221](https://github.com/timescale/timescaledb/pull/10221) Fix incremental refresh skipping the last bucket
+* [#10278](https://github.com/timescale/timescaledb/pull/10278) Drop `job_errors` view in `bgw_job_stat_history` migration
+* [#10280](https://github.com/timescale/timescaledb/pull/10280) `RETURNING` clause returned no rows for `INSERT` using direct compress
+* [#10281](https://github.com/timescale/timescaledb/pull/10281) Disable direct compress when the destination table has an exclusion constraint so the constraint is still enforced
+* [#10282](https://github.com/timescale/timescaledb/pull/10282) Only count directly compressed rows toward the command tag when the `INSERT` sets it
+* [#10286](https://github.com/timescale/timescaledb/pull/10286) Propagate `VACUUM` on a chunk to the compressed relation when running on the chunk directly
+* [#10302](https://github.com/timescale/timescaledb/pull/10302) Fix useless-join removal and self-join elimination for hypertables
+* [#10313](https://github.com/timescale/timescaledb/pull/10313) Allow running `ALTER EXTENSION timescaledb UPDATE` inside a transaction block
+* [#10315](https://github.com/timescale/timescaledb/pull/10315) Fix overlap detection with running max
+* [#10324](https://github.com/timescale/timescaledb/pull/10324) Fix stale index entries after `rebuild_sparse_index()` on compressed chunks
+
+**GUCs**
+* `timescaledb.enable_hypertable_expansion_for_dml`: allow using the optimized TimescaleDB hypertable expansion code for `UPDATE` and `DELETE` instead of the generic PostgreSQL inheritance hierarchy expansion. On by default.
+
+**Thanks**
+* @FrancescEthon and @ManuelEthon for reporting the issue
+* @h0rn3t for reporting a problem with `VACUUM` not propagating to the compressed relation
+* @MaximeEthon for reporting an issue with prepared statement parameters in DML decompression
+* @proddata for reporting a problem when upgrading from 2.15.3 to 2.28.2
+* @tureba for reporting and fixing stale sparse-index entries after rebuild
+* @viniciusrsouza for reporting an issue with hierarchical continuous aggregates
+
 ## 2.28.3 (2026-07-16)
 
 This release contains performance improvements and bug fixes since the 2.28.2 release. We recommend that you upgrade at the next available opportunity.