Possibillity to delete markets
The markets are adding up and adding needless weight to the database. There should be a delete button that
- Deletes all contracts with marketid=
- Deletes all contractsets with marketid=
- Deletes all user cash holdings for market
- Deletes all user contract holdings for contracts in database
- Deletes tag from all users if no other market is using it?
This has been done manually earlier. See #98 (closed)