MCP PostgreSQL Operations

# Pull Request ## Description <!-- Briefly describe what this PR does --> ## Type of Change <!-- Mark the relevant option with an "x" --> - [ ] 🐛 Bug fix (non-breaking change that fixes an issue) - [ ] ✨ New feature (non-breaking change that adds functionality) - [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected) - [ ] 📚 Documentation update - [ ] 🔧 Code refactoring (no functional changes) - [ ] 🎨 Style/formatting changes - [ ] ⚡ Performance improvement - [ ] 🧪 Adding or updating tests ## Related Issues <!-- Link to related issues using # --> Fixes #(issue number) Relates to #(issue number) ## Changes Made <!-- List the main changes in this PR --> - - - ## PostgreSQL Compatibility <!-- Mark all that apply with an "x" --> - [ ] Tested on PostgreSQL 12 - [ ] Tested on PostgreSQL 13 - [ ] Tested on PostgreSQL 14 - [ ] Tested on PostgreSQL 15 - [ ] Tested on PostgreSQL 16 - [ ] Tested on PostgreSQL 17 - [ ] Version-aware implementation (handles differences between versions) - [ ] Extension-independent (works without pg_stat_statements/pg_stat_monitor) - [ ] Extension-dependent (requires specific extensions) ## Testing <!-- Describe how you tested your changes --> ### Manual Testing - [ ] Tested with MCP Inspector (`./scripts/run-mcp-inspector-local.sh`) - [ ] Tested with direct execution - [ ] Tested with Docker environment - [ ] Tested with custom PostgreSQL instance ### Test Environment - PostgreSQL version(s): - Extensions installed: - Environment: [ ] Docker [ ] Local [ ] RDS/Aurora [ ] Other: ___ ### Test Cases <!-- List specific test cases or scenarios --> - [ ] Basic functionality works - [ ] Error handling works correctly - [ ] Edge cases handled - [ ] Performance acceptable - [ ] Output format consistent ## Documentation <!-- Mark all that apply with an "x" --> - [ ] Updated README.md - [ ] Updated Tool Compatibility Matrix - [ ] Added usage examples - [ ] Updated docstrings - [ ] No documentation needed ## Security Considerations <!-- Mark all that apply with an "x" --> - [ ] Read-only operations only - [ ] No sensitive data exposed - [ ] Proper input validation - [ ] No SQL injection risks - [ ] Follows principle of least privilege ## Screenshots/Output Examples <!-- If applicable, add screenshots or example outputs --> ## Checklist <!-- Mark completed items with an "x" --> - [ ] My code follows the project's style guidelines - [ ] I have performed a self-review of my code - [ ] My code is properly commented, particularly in complex areas - [ ] I have made corresponding changes to the documentation - [ ] My changes generate no new warnings - [ ] I have tested my code across multiple PostgreSQL versions where applicable - [ ] Any dependent changes have been merged and published ## Additional Notes <!-- Add any additional notes, concerns, or context -->