Add index on numeric_value column for clinic_activity_logs table - created-by-agentic

[shaykeren]

This PR addresses a critical performance issue in the clinic_activity_logs table query operation. The query execution time has increased from 577.3μs to 4.51s, causing a severe bottleneck in the /api/clinic-activity/query-logs endpoint.

Changes made:

1. Added an index on the numeric_value column to improve query performance
2. Created a new migration file V4__Add_clinic_activity_logs_numeric_value_index.sql

Related issues:

• Performance degradation: TraceID 0AFBB90776DA61F63045E29EAB8D7590
• Asset ID: 37326f62-3656-11f0-b001-ca59c7e8e81d

Expected improvements:

• Query execution time should return to sub-millisecond range
• Elimination of full table scans
• Better resource utilization

Testing:

• The migration has been tested locally
• Query performance improved significantly after index creation
• No negative impact on write operations observed

Note: After applying this change, please monitor the query performance and table cache hit rate to ensure the improvement is sustained.