Introduced smart statement timeout, which is needed to limit the execution time when manually training aqo on special queries with a poor cardinality forecast and which aqo can dynamically change during this training.

Added aqo_query_stat_update, aqo_data_update and aqo_query_texts_update functions to update or insert a record in data files underlying the respective view.

Added aqo_memory_usage function to display the memory size required for aqo.

Renamed aqo_enable_query and aqo_disable_query functions to aqo_enable_class and aqo_disable_class, respectively.

Optimized pg_probackup input/output engine to improve performance.

Added support for lz4 and zstd compression algorithms.

Ended support for Postgres Pro 9.6.

Added computation of statistics on removal of all-frozen and all-visible marks in the visibility map.

Added the pgpro_stats_vacuum_database view, showing statistics about vacuuming each database in a cluster.

Fixed possible crash of a server where pgpro_stats.track was set to all that could occur when pgpro_stats processed a function body as a multistatement query.

Fixed inappropriate issuing of an “unrecognized expression node type: ...” warning in case a query plan contained a GatherMerge node.

Fixed too long execution of a query containing texts of JSON or XML documents of a special kind. The slowdown was possible because normalization of the query plan text could mistakenly include replacement of constants inside those documents.