Cleanup inside db_upgrade.sh script, which right now is dedicated only optional (performed manually) hivemind table schema upgrades

SQL scripts containing definitions of runtime code (functions/views etc) must be ready for reinstallation each time install_app is spawned

Reimplemented main query inside bridge_get_ranked_post_by_created_for_community to enforce using correct index

Eliminated not needed JOIN to hive_accounts table inside hivemind_app.muted_accounts_by_id_view definition

bridge_get_ranked_post_by_payout_comments_for_community supplemented by null-observer case optimization

Eliminated selects to blacklisted_by_observer_view and muted_accounts_by_id_view when observer account is not specified.

setup, since setup now sets last_modified_time

docker_entrypoint.sh has started hivemind as subprocess and did not pass
signals to it

https://stackoverflow.com/questions/76462990/python-docker-sigterm-not-being-fired-on-container-stop