* Declare return types on functions
And a very few other type related minor fixes
* Minor syntax fixes
* Remove unnecessary escape chars in regexes
* Remove unnecessary awaits
* Replace deprecated req.connection with req.socket
* Replace deprecated upload with uploadOne
* Remove unnecessary eslint-disable-next-line comments
* Comment empty functions / catch or finally clauses
* Fix irregular whitespaces
* Add missing returns (null)
* Remove unreachable code
* A few logical fixes
* Remove / Handle non-null assertions which are certainly unnecessary (e.g. in
tests)
* Start on database-error abstraction layer
* Add SQLite error abstraction
* Enable SQLite foreign key support
* Cleanup sqlite dialect slightly
Does it matter? Not really!
* Add MySQL error abstraction
* WIP Almost done with MSSQL
* Add correct error handling for MS SQL
* Fix mysql errors by not relying on value order
* Don't rely on sql in postgres exception translation
* Fix sqlite error parsing
* Remove foreign key constraint from activity to collections
A collection can be DB-only, but we still want to track activity for non-meta collections
* Translate error on update as well
