The other option is to have a column on the mailbox table to flag that
it is a default_mailbox -- but then I'd have to ensure there's only
one column for each "person" flagged that way.
- is_default BOOL column in mailbox table
- conditional index :
UNIQUE INDEX ON mailboxes( owner ) WHERE is_default = 't'
Second question. So, after a while the obvious problem happens and
users have too many mailboxes and they want a way to group them into
Looks like a tree. Why not use a LTREE ?
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TIP 9: In versions below 8.0, the planner will ignore your desire to
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