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

[doppleware]

This PR addresses a performance issue in the clinic_activity_logs table queries.

Problem:

• Query execution time increased from 667.7 microseconds to 2.68 seconds
• Full table scan required for queries filtering on numeric_value column

Solution:

• Added an index on the numeric_value column
• This will improve query performance for WHERE clauses using numeric_value

Impact:

• Reduces query execution time
• Eliminates full table scans
• Improves overall application performance

Related Issue: #94
Incident ID: 5aa1fb7a-3656-11f0-8db3-ca59c7e8e81d