Sun, 09 Jul 2023 14:33:45 +0200 wenzelm clarified "vacuum" operation for various database versions (PostgreSQL <= 10 is strictly speaking obsolete, but still used on some test machines);
Sat, 08 Jul 2023 19:32:57 +0200 wenzelm eliminate somewhat obsolete augment_tables (see ff164add75cd), to support obsolete versions 10 and 9.x;
Sat, 08 Jul 2023 19:28:26 +0200 wenzelm clarified operation: sequential vacuum to support obsolete versions 10 and 9.x;
Sat, 08 Jul 2023 19:14:09 +0200 wenzelm clarified operation: empty means "empty" instead of "full";
Sat, 08 Jul 2023 16:48:15 +0200 wenzelm merged
Sat, 08 Jul 2023 16:07:45 +0200 wenzelm proper data_domain for symmetric difference;
Sat, 08 Jul 2023 15:52:57 +0200 wenzelm tuned: avoid redundant db access;
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