# Code Review Fixes Summary

## Critical Syntax Errors Fixed

### 1. serde_json Double Serialization Syntax Errors

**Files Affected:**
- `backend/src/main.rs` (lines 747, 1478-1520)
- `backend/src/handlers_sync.rs` (lines 276, 407-414)

**Problem:**
```rust
// BEFORE (INVALID SYNTAX)
serde_json::to_string(serde_json::to_string(&form.value).unwrap()form.value).unwrap_or_default()
```

**Error**: Malformed syntax - `.unwrap()form.value)` is invalid Rust. The `.unwrap()` call was followed by `.form.value` which is not a valid method chain.

**Solution:**
```rust
// AFTER (CORRECT)
serde_json::to_string(&form.value).unwrap_or_default()
```

**Impact**: 
- Fixed compilation errors in config update handlers
- Fixed setup wizard configuration handlers
- Now properly serializes JSON values with graceful error handling

---

### 2. Duplicate Table Definition

**File Affected:**
- `database/init.sql` (removed lines 519-529)

**Problem:**
The `sync_logs` table was defined twice in the database initialization script:
1. First definition at lines 303-324
2. Duplicate definition at lines 519-529

**Solution:**
Removed the duplicate definition completely.

**Impact**:
- Prevents PostgreSQL errors during database initialization
- Eliminates redundant table creation logic

---

### 3. Error Handling Improvements

**Pattern Changed:**
```rust
// BEFORE
serde_json::to_string(...).unwrap()

// AFTER
serde_json::to_string(...).unwrap_or_default()
```

**Files Affected:**
- `backend/src/main.rs`
- `backend/src/handlers_sync.rs`

**Impact**:
- More graceful error handling
- Prevents panics during JSON serialization
- Uses sensible defaults when serialization fails

---

## Verification

✅ All syntax errors in main.rs fixed
✅ All syntax errors in handlers_sync.rs fixed  
✅ Duplicate table definition removed
✅ No remaining `.unwrap()form.value` patterns found
✅ No remaining double serialization patterns found

## Next Steps

Remaining critical issues to address (not part of this fix):
1. **Security Issue**: Hardcoded session ID in axum_main.rs:397
2. **Logic Error**: Placeholder user ID in main.rs:576
3. **Security Issue**: Missing input validation on sensitive fields
4. **Error Handling**: Multiple `.unwrap()` calls should use proper error handling
