* Set a flag to do aclk sync thread shutdown
Attempt to dequeue a cmd in case the queue is full and someone is blocked
* Drop tables and recreate instead of deleting
* Add commands to check the database -W check-database, fix-database, compact-database
* Split the database setup to config and cleanup part
* Add checks during database setup and cleanup to detect corruption to the dimension and chart tables
* Add full database check and refactor code
* Change commands to better indicate that the operations refer to the sqlite metadata database (not the metrics dbengine database)
* Add check for table being null (request for entire database check)
* Rename command for better clarity
* Enhance the dimension delete table and adjust the trigger to include chart_id and host_id
* Add the aclk_process_dimension_deletion function
* Change variable chart_name in aclk_upd_dimension_event (it is st->id from st.type dot st.id)
* Process dimension deletion when retention updates are sent
* Do not send charts if we don't have dimensions
* Add check for uuid_parse return code
* Move retention code to the charts
* Log information about node registration and updates
* Prevent deadlock if aclk_database_enq_cmd locks for a node
* Improve message (indicate that it comes from alerts). This will be improved in a followup PR
* Disable parts that can't be used if the new cloud env is not available
* Set dimension FLAG if message has been queued
* Queue messages using the correct protocol enabled
* Cleanup unused functions
Rename functions that queue charts and dimensions
Improve the generic chart payload add function
Add a counter for pending charts/dimension payloads to avoid polling the db
Delay the retention update message until we are done with the updates
Fix full resync command to handle sequence_id = 0 correctly
Disable functions not needed when the new cloud env functionality is not compiled
* Add chart_payload count and retry count
Output information or error message if we fail to queue chart/dimension PUSH commands
Only try to queue commands if we have chart_payload_count>0
Remove the event loop shutdown opcode handle
* Improve detection of shutdown (check netdata_exit)
* Adjusting info messages
