3. Troubleshooting Guides

Write a comprehensive troubleshooting guide for this error:

Error: "Connection timeout: Unable to establish database connection"
Context: Database connection in production environment
Database: PostgreSQL 14
Connection method: Connection pool

Include:
1.
Possible causes with likelihood
2.
Step-by-step diagnostic process
3.
Solution steps for each cause
4.
Prevention strategies
5.
Related errors and their solutions
6.
Monitoring recommendations
7.
When to contact support

Please provide:
- Clear, actionable steps for each solution
- Code examples where relevant
- Configuration snippets for common fixes
- A decision tree for narrowing down causes