diff --git a/src/lib/integrationTests/formatTestError.ts b/src/lib/integrationTests/formatTestError.ts
index 5b976edd..1cda04b5 100644
--- a/src/lib/integrationTests/formatTestError.ts
+++ b/src/lib/integrationTests/formatTestError.ts
@@ -2,8 +2,87 @@
  * Test Error Formatting Utility
  * 
  * Provides robust error formatting for test results to avoid "[object Object]" messages
+ * Includes pattern matching for common Supabase/Postgres constraint violations
  */
 
+/**
+ * Error pattern matchers for common database constraint violations
+ */
+const ERROR_PATTERNS = [
+  {
+    // RLS policy violations
+    pattern: /new row violates row-level security policy for table "(\w+)"/i,
+    format: (match: RegExpMatchArray) => 
+      `RLS Policy Violation: Cannot insert into table "${match[1]}". Check that RLS policies allow this operation and user has proper authentication.`
+  },
+  {
+    // NOT NULL constraint violations
+    pattern: /null value in column "(\w+)" of relation "(\w+)" violates not-null constraint/i,
+    format: (match: RegExpMatchArray) => 
+      `NOT NULL Constraint: Column "${match[1]}" in table "${match[2]}" cannot be null. Provide a value for this required field.`
+  },
+  {
+    // UNIQUE constraint violations
+    pattern: /duplicate key value violates unique constraint "(\w+)"/i,
+    format: (match: RegExpMatchArray) => 
+      `UNIQUE Constraint: Duplicate value violates constraint "${match[1]}". This value already exists in the database.`
+  },
+  {
+    // Foreign key violations
+    pattern: /insert or update on table "(\w+)" violates foreign key constraint "(\w+)"/i,
+    format: (match: RegExpMatchArray) => 
+      `Foreign Key Violation: Table "${match[1]}" references non-existent record (constraint: "${match[2]}"). Ensure the referenced entity exists first.`
+  },
+  {
+    // Foreign key violations (alternative format)
+    pattern: /violates foreign key constraint/i,
+    format: () => 
+      `Foreign Key Violation: Referenced record does not exist. Create the parent entity before creating this dependent entity.`
+  },
+  {
+    // Check constraint violations
+    pattern: /new row for relation "(\w+)" violates check constraint "(\w+)"/i,
+    format: (match: RegExpMatchArray) => 
+      `Check Constraint: Validation failed for table "${match[1]}" (constraint: "${match[2]}"). The provided value does not meet validation requirements.`
+  },
+  {
+    // Column does not exist
+    pattern: /column "(\w+)" of relation "(\w+)" does not exist/i,
+    format: (match: RegExpMatchArray) => 
+      `Schema Error: Column "${match[1]}" does not exist in table "${match[2]}". Check database schema or migration status.`
+  },
+  {
+    // Could not find column in schema cache
+    pattern: /Could not find the '(\w+)' column of '(\w+)' in the schema cache/i,
+    format: (match: RegExpMatchArray) => 
+      `Schema Cache Error: Column "${match[1]}" not found in table "${match[2]}". The schema may have changed - try refreshing the database connection.`
+  },
+  {
+    // Table does not exist
+    pattern: /relation "(\w+)" does not exist/i,
+    format: (match: RegExpMatchArray) => 
+      `Schema Error: Table "${match[1]}" does not exist. Run migrations or check database schema.`
+  },
+  {
+    // Permission denied
+    pattern: /permission denied for (?:table|relation) "?(\w+)"?/i,
+    format: (match: RegExpMatchArray) => 
+      `Permission Denied: Insufficient permissions to access table "${match[1]}". Check RLS policies and user roles.`
+  },
+  {
+    // Rate limit errors
+    pattern: /Rate limit exceeded\. Please wait (\d+) seconds?/i,
+    format: (match: RegExpMatchArray) => 
+      `Rate Limited: Too many requests. Wait ${match[1]} seconds before retrying.`
+  },
+  {
+    // Rate limit errors (alternative format)
+    pattern: /Too many submissions in a short time\. Please wait (\d+) seconds?/i,
+    format: (match: RegExpMatchArray) => 
+      `Rate Limited: Submission throttled. Wait ${match[1]} seconds before submitting again.`
+  }
+];
+
 /**
  * Format error for test result display
  * Handles Error objects, PostgresError objects, and plain objects
@@ -12,48 +91,62 @@
  * @returns Formatted, human-readable error string
  */
 export function formatTestError(error: unknown): string {
-  // Standard Error objects
-  if (error instanceof Error) {
-    return error.message;
-  }
+  let errorMessage = '';
   
-  // Object-like errors (PostgresError, custom error objects, etc.)
-  if (typeof error === 'object' && error !== null) {
+  // Extract base error message
+  if (error instanceof Error) {
+    errorMessage = error.message;
+  } else if (typeof error === 'object' && error !== null) {
     const err = error as any;
     
     // Try common error message properties
     if (err.message && typeof err.message === 'string') {
-      return err.message;
-    }
-    
+      errorMessage = err.message;
+      
+      // Include additional Supabase error details if present
+      if (err.details && typeof err.details === 'string') {
+        errorMessage += ` | Details: ${err.details}`;
+      }
+      if (err.hint && typeof err.hint === 'string') {
+        errorMessage += ` | Hint: ${err.hint}`;
+      }
+      if (err.code && typeof err.code === 'string') {
+        errorMessage += ` | Code: ${err.code}`;
+      }
+    } 
     // Some errors nest the actual error in an 'error' property
-    if (err.error) {
+    else if (err.error) {
       return formatTestError(err.error);
     }
-    
     // Some APIs use 'msg' instead of 'message'
-    if (err.msg && typeof err.msg === 'string') {
-      return err.msg;
+    else if (err.msg && typeof err.msg === 'string') {
+      errorMessage = err.msg;
     }
-    
-    // Supabase errors might have details
-    if (err.details && typeof err.details === 'string') {
-      return `${err.message || 'Error'}: ${err.details}`;
-    }
-    
     // Last resort: stringify the entire object
-    try {
-      const stringified = JSON.stringify(error, null, 2);
-      // If it's too long, truncate it
-      return stringified.length > 500 
-        ? stringified.substring(0, 500) + '... (truncated)'
-        : stringified;
-    } catch {
-      // JSON.stringify can fail on circular references
-      return String(error);
+    else {
+      try {
+        const stringified = JSON.stringify(error, null, 2);
+        errorMessage = stringified.length > 500 
+          ? stringified.substring(0, 500) + '... (truncated)'
+          : stringified;
+      } catch {
+        // JSON.stringify can fail on circular references
+        errorMessage = String(error);
+      }
+    }
+  } else {
+    // Primitive values (strings, numbers, etc.)
+    errorMessage = String(error);
+  }
+  
+  // Apply pattern matching to format known constraint violations
+  for (const { pattern, format } of ERROR_PATTERNS) {
+    const match = errorMessage.match(pattern);
+    if (match) {
+      return format(match);
     }
   }
   
-  // Primitive values (strings, numbers, etc.)
-  return String(error);
+  // Return original message if no patterns matched
+  return errorMessage;
 }