Preliminary Hivemind ci

See merge request !31

api tests started with cmake

See merge request !29

Updated version of tests_api

See merge request !27

Dk api fixes

See merge request !26

- Added missing awaits,
- Fix for `datetime` is not JSON serializable

Fixed obvious and not so obvious errors in SQL and python code.

Version of tests_api submodule bumped to 29f1d442497f72108cb4bdf22f1984442cd5162d

See merge request !24

Dk issue 3 pyresttests

See merge request !20

Merge branch 'dk-issue-3-pyresttests' of gitlab.syncad.com:hive/hivemind into dk-issue-3-pyresttests

Added patterns for bridge api tests. Tests passes on production.

- Added missing output columns for query used at implementation of get_ranked_posts,
- Eliminated slow subquery, replaced with inner join

- fixed bugs in SQL query (typos, broken table aliases)
- used joins to eliminate 3x queries to hive_posts_data
- added missing author_rep output column in the query

[JES] Fix a bug on checking for last update time. If the initial update time was never set, the check will fail

Fix for reblog operation in custom_op

See merge request !19

- Fixed returning None type as a result of processing reblog operation.
- Added logging to log this error in the future (most likely will log
  nothing).