Merge branch 'postgres12_optimization' into 'develop'

.gitlab-ci.yaml

hive/db/schema.py

hive/db/sql_scripts/bridge_get_account_posts_by_replies.sql

hive/db/sql_scripts/bridge_get_by_feed_with_reblog.sql

hive/db/sql_scripts/bridge_get_discussion.sql

...db/sql_scripts/bridge_get_ranked_post_for_communities.sql

hive/db/sql_scripts/update_posts_rshares.sql

hive/db/sql_scripts/upgrade/upgrade_table_schema.sql

scripts/ci/setup_env.py