Update queries for new db structure

[lostystyg]

The new db structure was introduced in #502. This issue is a part of #425.

Progress

Base

• [x] TransactionRepository (inserting/deletion/grabbing txs)
• [x] Chain repository (indexing blocks)
• [x] Staker
• [ ] Migration

Consensus

It was decided to fully rework consensus queries (especially for tx validation rules)

• Social
  • [ ] Account
  • [ ] Collections
  • [ ] Posts
  • [ ] Comments
  • [ ] ...
• [ ] Moderation
• [ ] Staker Lottery
• [ ] Reputations/Badges

API

• [x] Explorer
• [x] Push notifications
• [x] Web post processing (tags, content search)
• [x] Events
• [x] Activities
• [ ] WebRpc
• [ ] Search rpc
• [ ] RatingsRepository
• [ ] Content rpc (feeds, hot posts, etc)
• [ ] Comments rpc
• [ ] Scores rpc
• [ ] Account rpc (subscribers, settings, blockings, etc)
• [ ] Notifications (getmissedinfo)

Db indices

A big part of this task is to reinvent a new set of indices to be used in queries.