QFQ

MariaDB > 10.2.4 (Debian Buster comes with 10.3) has STRICT_TRANS_TABLES set by default. (see https://mariadb.com/kb/en/library/documentation/mariadb-administration/variables-and-modes/sql-mode/)
This breaks QFQ as no defaults are set for text columns in Form or FormElement.

Setting a default for these tables does work but has the ugly side-effect that on load the QFQ-Form Editor shows two single quotes as default value for all text fields...
A better solution is to allow all non-mandatory fields without default values to be NULL.

ALTER TABLE `Form`
CHANGE `noteInternal` `noteInternal` text COLLATE 'utf8_general_ci' NULL AFTER `title`,
CHANGE `multiSql` `multiSql` text COLLATE 'utf8_general_ci' NULL AFTER `multiMode`,
CHANGE `parameter` `parameter` text COLLATE 'utf8_general_ci' NULL AFTER `bsNoteColumns`,
CHANGE `parameterLanguageA` `parameterLanguageA` text COLLATE 'utf8_general_ci' NULL AFTER `parameter`,
CHANGE `parameterLanguageB` `parameterLanguageB` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageA`,
CHANGE `parameterLanguageC` `parameterLanguageC` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageB`,
CHANGE `parameterLanguageD` `parameterLanguageD` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageC`;

ALTER TABLE `FormElement`
CHANGE `modeSql` `modeSql` text COLLATE 'utf8_general_ci' NULL AFTER `mode`,
CHANGE `note` `note` text COLLATE 'utf8_general_ci' NULL AFTER `rowLabelInputNote`,
CHANGE `adminNote` `adminNote` text COLLATE 'utf8_general_ci' NULL AFTER `note`,
CHANGE `value` `value` text COLLATE 'utf8_general_ci' NULL AFTER `placeholder`,
CHANGE `sql1` `sql1` text COLLATE 'utf8_general_ci' NULL AFTER `value`,
CHANGE `parameter` `parameter` text COLLATE 'utf8_general_ci' NULL AFTER `sql1`,
CHANGE `parameterLanguageA` `parameterLanguageA` text COLLATE 'utf8_general_ci' NULL AFTER `parameter`,
CHANGE `parameterLanguageB` `parameterLanguageB` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageA`,
CHANGE `parameterLanguageC` `parameterLanguageC` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageB`,
CHANGE `parameterLanguageD` `parameterLanguageD` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageC`,
CHANGE `clientJs` `clientJs` text COLLATE 'utf8_general_ci' NULL AFTER `parameterLanguageD`;

an alternative workaround is to deactivate STRICT_TRANS_TABLES by setting
[init] => SET names utf8; SET sql_mode = "ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION";
in the extension config of qfq (this might also be needed for existing installations as upgrading large databases where no care was used on allowing NULL or setting defaults is a pain)