perf(APIv2): additional optimizations and cleanup for searches

[skateman]

With the help of @dkuc I was able to further optimise some (NOT) IN subqueries, mainly used for searching. This pattern should be further used in the remaining search definitions and all the raw SQL ones can be eliminated.

From:

(inventory.hosts.id IN (SELECT policy_systems.system_id FROM policy_systems) 

To:

EXISTS(SELECT 1 FROM policy_systems WHERE policy_systems.system_id = inventory.hosts.id)

Secure Coding Practices Checklist GitHub Link

• https://github.com/RedHatInsights/secure-coding-checklist

Secure Coding Checklist

• Input Validation
• Output Encoding
• Authentication and Password Management
• Session Management
• Access Control
• Cryptographic Practices
• Error Handling and Logging
• Data Protection
• Communication Security
• System Configuration
• Database Security
• File Management
• Memory Management
• General Coding Practices