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-# Critical Bug Fixes - January 2026
-
-**Timeline**: Issues existed for 2-3 months before being fixed  
-**Impact**: Customer backup/restore operations failing through TUI  
-**Fixed in**: v3.42.5 through v3.42.10
-
----
-
-## Root Cause Analysis
-
-### Bug #1: Encryption Detection False Positive (v3.42.5)
-**File**: `internal/backup/encryption.go:92`  
-**Issue**: `IsBackupEncrypted()` returned TRUE for ALL files  
-**Impact**: Normal (unencrypted) backups could not be restored  
-**Root Cause**: Fallback logic checked if 12 bytes could be read (nonce size) - always true for any file  
-**Fix**: Properly detect magic bytes (1f 8b for gzip, PGDMP for PostgreSQL custom format)
-
-### Bug #2-13: cmd.Wait() Deadlocks (v3.42.6-v3.42.7)
-**Files**: 
-- `internal/backup/engine.go` (4 functions)
-- `internal/restore/engine.go` (3 functions)  
-- `internal/engine/mysqldump.go` (2 functions)
-- `internal/backup/engine.go:createArchive` (tar/pigz pipeline)
-
-**Issue**: 12 functions with blocking `cmd.Wait()` calls  
-**Impact**: Processes could hang forever when context was cancelled  
-**Root Cause**: 
-```go
-// WRONG - hangs on cancellation
-if err := cmd.Wait(); err != nil {
-    return err
-}
-```
-
-**Fix**: Channel-based pattern with Process.Kill()
-```go
-// CORRECT
-cmdDone := make(chan error, 1)
-go func() { cmdDone <- cmd.Wait() }()
-select {
-case err = <-cmdDone:
-case <-ctx.Done():
-    cmd.Process.Kill()
-    <-cmdDone
-}
-```
-
-### Bug #14-20: TUI Timeout Bugs (v3.42.8-v3.42.9)
-**THE PRIMARY ISSUE** - Why backups appeared to fail for months
-
-| File | Function | Old Timeout | New Timeout | Impact |
-|------|----------|-------------|-------------|---------|
-| restore_preview.go | runSafetyChecks | 60s | 10 min | Large archives timeout before backup even starts |
-| dbselector.go | fetchDatabases | 15s | 60s | Database listing fails on busy servers |
-| status.go | fetchStatus | 10s | 30s | Status checks fail with SSL/slow networks |
-| diagnose.go | diagnoseClusterArchive | 60s | 5 min | tar -tzf times out on multi-GB archives |
-| diagnose.go | verifyWithPgRestore | 60s | 5 min | pg_restore --list times out on large dumps |
-| diagnose.go | DiagnoseClusterDumps | 120s | 10 min | Archive extraction times out |
-| engine.go | detectLargeObjectsInDumps | 10s | 2 min | Large object detection fails |
-
-**Root Cause**: User sees "context deadline exceeded" in TUI, thinks pg_dump failed, but the operation never even started - it timed out during pre-validation checks.
-
-### Bug #21-22: Missing Panic Recovery (v3.42.8)
-**Files**: 
-- `internal/backup/engine.go:442` (BackupCluster goroutines)
-- `internal/restore/engine.go:861` (RestoreCluster goroutines)
-
-**Issue**: No `defer recover()` in parallel goroutines  
-**Impact**: Single database panic crashes entire cluster backup/restore  
-**Fix**: Added panic recovery with error counting
-
-### Bug #23: Variable Shadowing (v3.42.8)
-**File**: `internal/restore/engine.go:416`  
-**Issue**: Used `err` instead of `cmdErr` for exit code detection  
-**Impact**: Incorrect exit code reported in error messages
-
----
-
-## Code Quality Issues (v3.42.10)
-
-- Deprecated `io/ioutil` usage (Go 1.19+)
-- Duplicate imports
-- Unused fields and variables
-- Error string formatting violations
-- Ineffective assignments
-
----
-
-## Timeline
-
-- **Bugs introduced**: Unknown (existed 2-3 months)
-- **First report**: ~October 2025
-- **Investigation started**: January 7, 2026
-- **Fixed**: January 8, 2026 (v3.42.5 - v3.42.10)
-
----
-
-## Customer Impact
-
-**Duration**: 2-3 months of failed backup/restore operations  
-**Symptom**: TUI backups appeared to fail immediately with timeout errors  
-**Actual Issue**: Pre-validation checks timing out, not the actual backup  
-**Business Impact**: Potential data loss risk, support costs, reputation damage
-
----
-
-## Lessons Learned
-
-1. **Never use arbitrary short timeouts** for operations on potentially large data
-2. **Always use channel-based pattern** for cmd.Wait() with context
-3. **Add panic recovery** to all goroutines in production code
-4. **Test with realistic data sizes** (multi-GB archives)
-5. **Systematic code audits** should be first step, not last resort
-
----
-
-*This document is for internal use and legal purposes only.*