...
- There is a new table: filter - it allows to store custom user filters
- There is a new table: user_filter - it allows to link filter with user; it is possible to share filter between different user - this is why filters require linking table between user and filter
Refined schema (step 10)
user_filter
- There are fixes inside user_filter table
- There is a new explicit ID column
- relations are non-identifying (user - user_filter - filter)
