Notifications - Step 1

[andreynering]

First step to resolve #145

This deprecates #321

I plan 2 steps:

• Create database table and create/update notifications (this one)
• Actually have UI for notifications

[tboerger]

Just put the constants in a single block

[andreynering]

It's necessary for iota and different types, as discussed below.

[tboerger]

Really a separate type for simple integers?

[lunny]

I really like this. :)

[tboerger]

If the type got additional functions it makes sense to me, but not for the current status

[andreynering]

I also prefer enum, and others too, since I was asked to use this in the previous PR.

[tboerger]

Generally not bad, but you should select more collections from the db instead of firing lots of small queries

[andreynering]

you should select more collections from the db instead of firing lots of small queries

Updated. No more queries inside the loop.

[lunny]

Except that then LGTM

[lunny]

put sess.Close() before sess.Begin()

[andreynering]

Deprecated by #523