Delete FIX_SQLALCHEMY_F405.md

FIX_SQLALCHEMY_F405.md

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-# SQLAlchemy f405 Error Fix
-
-## Error
-```
-sqlalchemy.exc.AmbiguousForeignKeysError: 
-Could not determine join condition between parent/child tables on relationship
-(Background on this error at: https://sqlalche.me/e/20/f405)
-```
-
-## Root Cause
-The `User` model was missing the `conversations` relationship, causing SQLAlchemy to be unable to properly join the tables when querying conversations.
-
-## Fix Applied
-
-**File:** `backend/models/user.py`
-
-**Added:**
-```python
-from sqlalchemy.orm import relationship
-
-# Inside User class:
-# Relationships
-conversations = relationship("Conversation", backref="user", cascade="all, delete-orphan")
-```
-
-## Why This Fixes It
-
-The SQLAlchemy f405 error occurs when there's an ambiguous or missing relationship definition. In this case:
-
-- `Conversation` model had:
-  - `user_id = ForeignKey("users.id")`
-  - Trying to create a back-reference to User
-
-- `User` model was missing the corresponding relationship definition
-
-- SQLAlchemy couldn't determine how to join the tables
-
-By adding the `conversations` relationship to the User model:
-- ✅ Complete bidirectional relationship established
-- ✅ SQLAlchemy can now properly join User ↔ Conversation
-- ✅ Cascade delete works properly (when user deleted, conversations deleted)
-- ✅ No ambiguity in foreign key relationships
-
-## Testing
-
-The uvicorn server should have automatically reloaded. Try:
-
-1. Upload an image in the chat
-2. Send a message
-3. Check that no SQLAlchemy errors appear in backend logs
-4. Verify message is saved to database
-
-## Related Models
-
-All relationships are now properly defined:
-
-```
-User
- ↓ (one-to-many)
- conversations[] ✅
- agents[] ✅
-
-Agent
- ↓ (one-to-many)
- conversations[] ✅
- compilation_jobs[] ✅
- chunks[] ✅
-
-Conversation
- ↓ (one-to-many)
- messages[] ✅
- ↑ (many-to-one)
- user ✅ (via backref)
- agent ✅ (via back_populates)
-```
-
-## Status
-✅ **FIXED** - The relationship is now complete and the error should be resolved.