GPT_MEMORY_ISOLATION_FIX.md

🔒 GPT Memory Isolation Fix

🎯 Problem Summary

Your application had critical memory isolation issues:

1. User Memory Bleeding: New users saw previous users' GPT responses and memory
2. Module Isolation Issues: Different GPT modules shared responses and summaries
3. Session Management Problems: Sessions weren't properly isolated per user

🛠️ Solutions Implemented

1. Database Model Updates

GPTModeSession Model

class GPTModeSession(Base):
    # Added user isolation
    user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id"), nullable=False)
    
    # Added unique constraint per user per mode per project
    __table_args__ = (
        UniqueConstraint("project_id", "user_id", "mode_name", name="uq_project_user_mode"),
    )

ConversationMemory Model

class ConversationMemory(Base):
    # Added user isolation
    user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id"), nullable=False)
    
    # Added user index for performance
    __table_args__ = (
        Index("idx_conversation_user", "user_id"),
    )

CrossModuleMemory Model

class CrossModuleMemory(Base):
    # Added user isolation
    user_id: Mapped[str] = mapped_column(String(36), ForeignKey("users.id"), nullable=False)
    
    # Added unique constraint per user per project
    __table_args__ = (
        UniqueConstraint("project_id", "user_id", name="uq_project_user_cross_module"),
    )

2. Service Layer Updates

Conversation Service

• Added user_id parameter to all memory creation methods
• Updated memory retrieval to filter by user
• Ensured cross-module memory is user-specific

LangChain Service

• Added user isolation to conversation chains
• Updated memory creation to include user context
• Ensured RAG results are user-specific

3. API Layer Updates

Assistant Router

• Added user filtering to all session queries
• Updated session creation to include user_id
• Ensured all endpoints respect user isolation

4. Database Migration

Migration Script

async def migrate_user_isolation():
    # Add user_id columns
    # Update existing records
    # Add foreign key constraints
    # Add unique constraints

🚀 Implementation Steps

Step 1: Run Database Migration

python setup_database.py

This will:

• Add user_id columns to existing tables
• Migrate existing data to link to project owners
• Add proper constraints and indexes

Step 2: Restart Application

python main.py

Step 3: Test User Isolation

Test Case 1: New User Registration

1. Register a new user
2. Create a project
3. Start a GPT mode session
4. Verify no previous memory is shown

Test Case 2: Multiple Users

1. Create two different user accounts
2. Both users create projects with same name
3. Both users start same GPT mode
4. Verify responses are completely isolated

Test Case 3: Module Switching

1. User starts one GPT module
2. Complete some questions
3. Switch to different GPT module
4. Verify no cross-module memory bleeding

🔧 Additional Features

Session Cleanup Utility

async def clear_user_sessions(user_id: str):
    """Clear all sessions for a specific user."""
    # Clear GPT mode sessions
    # Clear conversation memory
    # Clear cross-module memory

Module Isolation Verification

async def verify_module_isolation(user_id: str, project_id: str):
    """Verify that modules are properly isolated."""
    # Check session isolation
    # Check memory isolation
    # Check response isolation

📊 Expected Results

Before Fix

• ❌ New users see previous users' responses
• ❌ GPT modules share memory
• ❌ Sessions persist across users
• ❌ Cross-module contamination

After Fix

• ✅ Complete user isolation
• ✅ Module-specific memory
• ✅ Clean session management
• ✅ Proper data separation

🧪 Testing Checklist

User Isolation Tests

• New user registration shows no previous memory
• Multiple users have completely separate experiences
• User logout/login maintains proper isolation
• User deletion removes all associated data

Module Isolation Tests

• Switching between GPT modules shows no cross-contamination
• Each module maintains its own conversation history
• Module summaries are independent
• RAG results are module-specific

Session Management Tests

• Sessions are user-specific
• Session cleanup works properly
• Session persistence is isolated
• Session recovery is user-specific

🔍 Monitoring & Debugging

Database Queries for Verification

-- Check user isolation
SELECT user_id, COUNT(*) FROM gpt_mode_sessions GROUP BY user_id;

-- Check module isolation
SELECT user_id, mode_name, COUNT(*) FROM gpt_mode_sessions GROUP BY user_id, mode_name;

-- Check memory isolation
SELECT user_id, module_id, COUNT(*) FROM conversation_memory GROUP BY user_id, module_id;

Logging for Debugging

logger.info(f"User {user_id} starting session for module {module_id}")
logger.info(f"Memory created for user {user_id} in module {module_id}")
logger.info(f"Session isolated for user {user_id}")

🚨 Important Notes

1. Data Migration: Existing data will be linked to project owners
2. Performance: Added indexes may slightly impact write performance
3. Storage: User isolation may increase storage requirements
4. Backup: Always backup database before running migration

📞 Support

If you encounter any issues:

1. Check database migration logs
2. Verify user isolation constraints
3. Test with fresh user accounts
4. Review session management logs

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This fix ensures complete isolation between users and GPT modules, providing a clean, secure experience for each user.