Improve PostgreSql Authentication

.vscode/settings.json

@@ -4,5 +4,13 @@
     ],
     "python.testing.unittestEnabled": false,
     "python.testing.pytestEnabled": true,
-    "cmake.ignoreCMakeListsMissing": true
+    "cmake.ignoreCMakeListsMissing": true,
+    "python.analysis.exclude": [
+        "tests/**",
+        "src/mpzsql/flightsql/generated/**"
+    ],
+    "python.analysis.ignore": [
+        "tests/**",
+        "src/mpzsql/flightsql/generated/**"
+    ]
 }

FIX_DEBUGGER_BREAKS.md

@@ -0,0 +1,60 @@
+# Fix VS Code Debugger Breaking on Caught Exceptions
+
+## Issue
+VS Code debugger is breaking at line 369 in `duckdb_backend.py` on the BinderException, even though our code properly catches and handles this exception.
+
+## Root Cause  
+The VS Code Python debugger is configured to break on **all exceptions**, including **caught exceptions**. This is why it stops at the line where the exception is raised, before our exception handler can process it.
+
+## Solution
+
+### Option 1: Configure VS Code Debugger Exception Settings
+1. **Open VS Code debugger**
+2. **In the Call Stack panel**, look for exception settings
+3. **Uncheck "Caught Exceptions"** or specifically **uncheck "BinderException"**
+4. **Keep "Uncaught Exceptions" checked** (this is what you want to catch)
+
+### Option 2: Add .vscode/launch.json Configuration
+Create/modify `.vscode/launch.json` with proper exception handling:
+
+```json
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python: Current File",
+            "type": "python",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal",
+            "justMyCode": true,
+            "exceptionHandling": {
+                "breakOnUncaughtExceptions": true,
+                "breakOnCaughtExceptions": false
+            }
+        }
+    ]
+}
+```
+
+### Option 3: Temporary Debug Workaround
+If you need to debug but want to skip the BinderException, add this temporary code:
+
+```python
+# Temporary debug bypass - remove after debugging
+import os
+if os.getenv('MPZSQL_DEBUG_SKIP_BINDER_CHECK'):
+    # Skip PREPARE check in debug mode
+    return pa.schema([])
+```
+
+Then set environment variable: `export MPZSQL_DEBUG_SKIP_BINDER_CHECK=1`
+
+## Verification
+Our code **is working correctly**. The test shows:
+- BinderException is properly caught ✅
+- Empty schema is returned as expected ✅  
+- Server doesn't crash ✅
+
+## Summary
+This is a **debugger configuration issue**, not a code issue. The exception handling is working perfectly - the debugger is just configured to break on all exceptions instead of only uncaught ones.