Add comprehensive session notes for widget fixes and SGE support

Documented key learnings from this session including:
- Widget configuration compatibility solutions
- SGE job status checking implementation patterns
- Mypy type checking fixes and patterns that work
- Documentation RST formatting solutions
- Specific code snippets and commit references

This provides a reference for future similar work and debugging.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jeremymanning

docs/notes/session_2025-01-29_widget_fixes_and_sge_support.md

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+# Session Notes: Widget Fixes, SGE Support, and Code Quality
+**Date**: 2025-01-29
+**Commit Range**: f45f680..e22f7b2
+
+## Major Accomplishments
+
+### 1. Widget Configuration Fixes (Issue #53)
+**Commit**: 0af5672 - "Fix widget test failure: prevent name field addition to default configs"
+
+#### Problem: Widget configurations were incompatible with ClusterConfig dataclass
+**Root Cause**: The widget was adding 'name' and 'description' fields to DEFAULT_CONFIGS, which ClusterConfig doesn't accept.
+
+**Solution**:
+```python
+# In notebook_magic.py - prevent name field from being added to default configs
+def _on_config_name_change(self, change):
+    """Handle changes to the config name field."""
+    if self.current_config_name and self.current_config_name in self.configs:
+        # Only add name field for non-default configs (avoid modifying DEFAULT_CONFIGS)
+        if self.current_config_name not in DEFAULT_CONFIGS:
+            # Update the name in the current configuration
+            self.configs[self.current_config_name]["name"] = change["new"]
+            # Update the dropdown to reflect the new display name
+            self._update_config_dropdown()
+```
+
+#### Problem: Dropdown validation errors when loading configurations
+**Root Cause**: Widget tried to set dropdown values that didn't exist in the options list.
+
+**Solution**:
+```python
+# Safe dropdown value setting with option checking
+aws_region = config.get("aws_region", "us-east-1")
+if aws_region in self.aws_region.options:
+    self.aws_region.value = aws_region
+else:
+    self.aws_region.value = self.aws_region.options[0] if self.aws_region.options else "us-east-1"
+```
+
+#### Problem: Missing cloud provider fields in ClusterConfig
+**Solution**: Added all missing fields to ClusterConfig dataclass:
+```python
+# AWS-specific settings
+aws_access_key: Optional[str] = None  # Alternative name used by widget
+aws_secret_key: Optional[str] = None  # Alternative name used by widget
+aws_instance_type: Optional[str] = None
+aws_cluster_type: Optional[str] = None  # ec2 or eks
+
+# Azure-specific settings
+azure_client_id: Optional[str] = None
+azure_client_secret: Optional[str] = None
+azure_instance_type: Optional[str] = None
+# ... etc
+```
+
+### 2. SGE Job Status Checking (Issue #52)
+**Commit**: 0026ecb - "Implement SGE job status checking support"
+
+#### Implementation: Added complete SGE support
+```python
+def _check_sge_status(self, job_id: str) -> str:
+    """Check SGE job status."""
+    cmd = f"qstat -j {job_id}"
+    try:
+        stdout, stderr = self._execute_remote_command(cmd)
+        if not stdout.strip() or "Following jobs do not exist" in stderr:
+            # Job not in queue, likely completed
+            return "completed"
+        else:
+            # Parse SGE job state from qstat output
+            # Common SGE states: r (running), qw (queued), Eqw (error), dr (deleting)
+            if "job_state                          r" in stdout:
+                return "running"
+            elif "job_state                          qw" in stdout:
+                return "queued" 
+            elif "job_state                          Eqw" in stdout:
+                return "failed"
+            elif "job_state                          dr" in stdout:
+                return "completed"
+            # Check for exit status indicating completion
+            elif "exit_status" in stdout:
+                return "completed"
+            else:
+                return "running"  # Default for unknown running states
+    except Exception:
+        return "unknown"
+```
+
+Also added SGE support to cancel_job:
+```python
+elif self.config.cluster_type == "sge":
+    self._execute_remote_command(f"qdel {job_id}")
+```
+
+### 3. Mypy Type Checking Fixes
+**Commit**: 1c08a19 - "Fix all mypy type checking errors"
+
+#### Key Patterns That Worked:
+
+1. **Optional return types for functions that can return None**:
+```python
+# Before
+def _extract_k8s_exception(self, job_id: str) -> Exception:
+
+# After  
+def _extract_k8s_exception(self, job_id: str) -> Optional[Exception]:
+```
+
+2. **Type assertions for validated parameters**:
+```python
+# When mypy can't infer that values are not None after validation
+if not all([subscription_id, client_id, client_secret, tenant_id]):
+    logger.error("Required parameters missing")
+    return False
+
+# Type assertions since we verified these are not None above
+assert isinstance(tenant_id, str)
+assert isinstance(client_id, str)
+assert isinstance(client_secret, str)
+assert isinstance(subscription_id, str)
+```
+
+3. **Type: ignore for third-party libraries without stubs**:
+```python
+import boto3  # type: ignore
+import cloudpickle  # type: ignore
+from kubernetes import client  # type: ignore
+```
+
+4. **Handling potential None values**:
+```python
+# os.cpu_count() can return None
+max_chunks = (os.cpu_count() or 1) * 2  # Allow some oversubscription
+```
+
+5. **Missing return statements in if/elif chains**:
+```python
+if cluster_type == "compute":
+    return {...}
+elif cluster_type == "gke":
+    return {...}
+else:
+    raise ValueError(f"Unknown cluster type: {cluster_type}")  # Added this
+```
+
+### 4. Documentation Build Fixes
+**Commit**: e22f7b2 - "Fix all documentation build errors"
+
+#### RST Formatting Issues That Were Fixed:
+
+1. **Code block formatting in docstrings**:
+```python
+# Before - causes "Unexpected indentation" error
+"""
+Example:
+    @cost_tracking_decorator('lambda', 'a100_40gb')
+    @cluster(cores=8, memory="32GB")
+    def my_training_function():
+        pass
+"""
+
+# After - proper RST code block syntax
+"""
+Example::
+
+    @cost_tracking_decorator('lambda', 'a100_40gb')
+    @cluster(cores=8, memory="32GB")
+    def my_training_function():
+        pass
+"""
+```
+
+2. **Module-level variable documentation**:
+```python
+# Can't use triple quotes for module constants, use #: instead
+#: Default cluster configurations available in the widget.
+#: 
+#: This dictionary contains pre-configured cluster templates for common use cases.
+#: Each configuration is a dictionary with cluster-specific settings.
+DEFAULT_CONFIGS = {
+    ...
+}
+```
+
+3. **RST title underlines must match title length**:
+```rst
+# Before - underline too short
+Configuration Methods
+--------------------
+
+# After - correct length
+Configuration Methods
+---------------------
+```
+
+## Test Results Summary
+
+- **Total Tests**: 312 (up from 306)
+- **New Tests Added**: 6 SGE-specific tests
+- **All Tests Passing**: ✅
+- **Mypy Errors**: 0 (fixed from 49)
+- **Documentation Errors**: 0 (fixed from 4)
+- **Documentation Warnings**: 0 (fixed from 15+)
+
+## Key Learnings
+
+1. **Widget Integration**: When building complex widgets, ensure that internal data structures remain compatible with the core API. Don't modify shared constants like DEFAULT_CONFIGS.
+
+2. **Dropdown Validation**: Always check if a value exists in dropdown options before setting it to prevent TraitErrors.
+
+3. **Type Annotations**: Be explicit about Optional types and use type assertions when mypy can't infer non-None values after validation.
+
+4. **Documentation**: RST is very particular about formatting - use `::` for code blocks and ensure title underlines match exactly.
+
+5. **Testing**: Adding comprehensive tests (like test_widget_fixes.py) helps catch integration issues early.
+
+## Next Steps
+
+- Monitor for any CI/CD issues with the mypy fixes
+- Consider adding more cloud provider regions/instances dynamically
+- Update documentation table to show SGE has full support