mailstore is a funny little table recording the revision of the database schema.
Almost every version of Archiveopteryx changes the database schema in some way. Most changes are extensions, some are bugfixes or architectural changes. The aox upgrade schema command changes the schema (preserving all data) and uses the mailstore table to keep track of the schema revision.
create table mailstore ( -- Grant: select, update revision integer not null primary key );
The mailstore table was introduced in version 0.93.
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Last modified: 2010-11-19