2025 Changelog

Backported in #83633: When distributed_ddl_output_mode='*_only_active', don't wait for new or recovered replicas that have replication lag bigger than max_replication_lag_to_enqueue. This should help to avoid DDL task is not finished on some hosts when a new replica becomes active after finishing initialization or recovery, but it accumulated huge replication log while initializing. Also, implement SYSTEM SYNC DATABASE REPLICA STRICT query that waits for replication log to become below max_replication_lag_to_enqueue. #83302 (Alexander Tokmakov).

Backported in #83570: Fix backup of an empty Memory table, causing the backup restore to fail with with BACKUP_ENTRY_NOT_FOUND error. #82791 (Julia Kartseva).
Backported in #83670: Fix incorrect memory around max_untracked_memory. #83607 (Azat Khuzhin).
Backported in #83661: INSERT SELECT with UNION ALL could lead to a null pointer dereference in a corner case. This closes #83618. #83643 (Alexey Milovidov).
Backported in #83741: Fix endless loop in estimateCompressionRatio() with block_size_bytes=0. #83704 (Azat Khuzhin).

Backported in #83649: Apply fix for CVE-2025-6375 in Poco from upstream. #82647 (Konstantin Bogdanov).

Backported in #83567: Bring back --pre-pull command to the integration tests jobs, it was deleted in #73291. #83528 (Mikhail f. Shiryaev).