7.8.1

#27999

Save composition references in different tables

#28036

Migration processors for model mapping

#28050

Extract TL-Sync into own project

#28011

Incorrect classification of association endings in compositions

#28030

No replay for version upgrade from TL-6 to TL-7.8

#28048

Sequence of migration instructions is incorrect

#28075

Missing "abstract" property for TLProperty's

#28043

Error in SQL migration utility

#28072

Migration for #27517 (User Management) crashes with inconsistencies