Dear development team, As per the PostgreSQL release documents: E.1. Release 12 https://www.postgresql.org/docs/12/release-12.html#id-1.11.6.5.5
PostgreSQL Version 12 removes: obsolete pg_constraint.consrc column obsolete pg_attrdef.adsrc column Akonadi executes this query that fails due to changes in the PostgreSQL schema DB=akonadi USER=akonadi SELECT pg_attribute.attname, pg_attribute.atttypid::int, pg_attribute.attnotnull, pg_attribute.attlen, pg_attribute.atttypmod, pg_attrdef.adsrc FROM pg_class, pg_attribute LEFT JOIN pg_attrdef ON (pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum) WHERE pg_table_is_visible(pg_class.oid) AND pg_class.relname = 'schemaversiontable' AND pg_attribute.attnum > 0 AND pg_attribute.attrelid = pg_class.oid AND pg_attribute.attisdropped = false ORDER BY pg_attribute.attnum DB=akonadi USER=akonadi SELECT ERROR: 42703: column pg_attrdef.adsrc does not exist at character 128 DB=akonadi USER=akonadi SELECT pg_attribute.attname, pg_attribute.atttypid::int, pg_attribute.attnotnull, pg_attribute.attlen, pg_attribute.atttypmod, pg_attrdef.adsrc FROM pg_class, pg_attribute LEFT JOIN pg_attrdef ON (pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum) WHERE pg_table_is_visible(pg_class.oid) AND pg_class.relname = 'schemaversiontable' AND pg_attribute.attnum > 0 AND pg_attribute.attrelid = pg_class.oid AND pg_attribute.attisdropped = false ORDER BY pg_attribute.attnum DB=akonadi USER=akonadi ALTER TABLE SchemaVersionTable ADD COLUMN version INTEGER NOT NULL DEFAULT 0 DB=akonadi USER=akonadi ALTER TABLE ERROR: 42701: column "version" of relation "schemaversiontable" already exists This causes akonadi to repeatedly try to update the SchemaVersionTable and quits with error. org.kde.pim.akonadiserver: Starting up the Akonadi Server... org.kde.pim.akonadiserver: Running DB initializer org.kde.pim.akonadiserver: "\nSql error: ERROR: column \"version\" of relation \"schemaversiontable\" already exists\n(42701) QPSQL: Unable to create query\nQuery: ALTER TABLE SchemaVersionTable ADD COLUMN version INTEGER NOT NULL DEFAULT 0" org.kde.pim.akonadiserver: Unable to initialize database. org.kde.pim.akonadiserver: Shutting down AkonadiServer... The schema information for these dropped columes can be obtained using the functions pg_constraint.consrc pg_get_constraintdef(pg_constraint.oid) pg_attrdef.adsrc pg_get_expr(pg_attrdef.adbin, pg_class.oid) So the Akonadi query: SELECT pg_attribute.attname, pg_attribute.atttypid::int, pg_attribute.attnotnull, pg_attribute.attlen, pg_attribute.atttypmod, pg_attrdef.adsrc FROM pg_class, pg_attribute LEFT JOIN pg_attrdef ON (pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum) WHERE pg_table_is_visible(pg_class.oid) AND pg_class.relname = 'schemaversiontable' AND pg_attribute.attnum > 0 AND pg_attribute.attrelid = pg_class.oid AND pg_attribute.attisdropped = false ORDER BY pg_attribute.attnum ; should probably be changed to something like: SELECT pg_attribute.attname, pg_attribute.atttypid::int, pg_attribute.attnotnull, pg_attribute.attlen, pg_attribute.atttypmod, pg_get_expr(pg_attrdef.adbin, pg_class.oid) AS adsrc FROM pg_class LEFT JOIN pg_attribute ON ( pg_attribute.attrelid = pg_class.oid ) LEFT JOIN pg_attrdef ON ( pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum ) WHERE pg_table_is_visible(pg_class.oid) AND pg_class.relname = 'schemaversiontable' AND pg_attribute.attnum > 0 AND pg_attribute.attisdropped = false ORDER BY pg_attribute.attnum; This will produce something like the following table: attname | atttypid | attnotnull | attlen | atttypmod | adsrc ------------+----------+------------+--------+-----------+------- version | 23 | t | 4 | -1 | 0 generation | 23 | t | 4 | -1 | 0 (2 rows)