| A | ↘ | B | PostgreSQL got worse |
| ⇢ | A | AbstractDatabase::connect() added | |
| ⇢ | A | PostgreSQL::userExists() added | |
| ⇢ | A | PostgreSQL::databaseExists() added | |
| ⇢ | A | AllConfig::getSystemConfig() added | |
| B | ↗ | A | PostgreSQL::createDatabase() improved |
| B | ↗ | A | PostgreSQL::createDBUser() improved |
| D | ↗ | B | PostgreSQL::setupDatabase() improved |
| B | ↛ | MySQL::connect() removed |