chore: ignore bin/ directory to prevent repository bloat

- Added WorkDir to Config for custom temp directory
- TUI Settings: new 'Work Directory' option to set alternative temp location
- Restore Preview: press 'w' to toggle work directory (uses backup dir as default)
- Diagnose View: now uses configured WorkDir for cluster extraction
- Config persistence: WorkDir saved to .dbbackup.conf

This fixes diagnosis/restore failures when /tmp is too small for large archives.
Use cases: servers with limited /tmp, 70GB+ archives needing 280GB+ extraction space.

.gitignore

@@ -9,10 +9,11 @@ logs/
 *.trace
 *.err
 
-# Ignore built binaries in root (keep bin/ directory for releases)
+# Ignore built binaries (built fresh via build_all.sh on release)
 /dbbackup
 /dbbackup_*
 !dbbackup.png
+bin/
 
 # Ignore development artifacts
 *.swp

AZURE.md

@@ -28,21 +28,16 @@ This guide covers using **Azure Blob Storage** with `dbbackup` for secure, scala
 
 ```bash
 # Backup PostgreSQL to Azure
-dbbackup backup postgres \
-  --host localhost \
-  --database mydb \
-  --output backup.sql \
-  --cloud "azure://mycontainer/backups/db.sql?account=myaccount&key=ACCOUNT_KEY"
+dbbackup backup single mydb \
+  --cloud "azure://mycontainer/backups/?account=myaccount&key=ACCOUNT_KEY"
 ```
 
 ### 3. Restore from Azure
 
 ```bash
-# Restore from Azure backup
-dbbackup restore postgres \
-  --source "azure://mycontainer/backups/db.sql?account=myaccount&key=ACCOUNT_KEY" \
-  --host localhost \
-  --database mydb_restored
+# Download backup from Azure and restore
+dbbackup cloud download "azure://mycontainer/backups/mydb.dump.gz?account=myaccount&key=ACCOUNT_KEY" ./mydb.dump.gz
+dbbackup restore single ./mydb.dump.gz --target mydb_restored --confirm
 ```
 
 ## URI Syntax
@@ -99,7 +94,7 @@ export AZURE_STORAGE_ACCOUNT="myaccount"
 export AZURE_STORAGE_KEY="YOUR_ACCOUNT_KEY"
 
 # Use simplified URI (credentials from environment)
-dbbackup backup postgres --cloud "azure://container/path/backup.sql"
+dbbackup backup single mydb --cloud "azure://container/path/"
 ```
 
 ### Method 3: Connection String
@@ -109,7 +104,7 @@ Use Azure connection string:
 ```bash
 export AZURE_STORAGE_CONNECTION_STRING="DefaultEndpointsProtocol=https;AccountName=myaccount;AccountKey=YOUR_KEY;EndpointSuffix=core.windows.net"
 
-dbbackup backup postgres --cloud "azure://container/path/backup.sql"
+dbbackup backup single mydb --cloud "azure://container/path/"
 ```
 
 ### Getting Your Account Key
@@ -196,11 +191,8 @@ Configure automatic tier transitions:
 
 ```bash
 # PostgreSQL backup with automatic Azure upload
-dbbackup backup postgres \
-  --host localhost \
-  --database production_db \
-  --output /backups/db.sql \
-  --cloud "azure://prod-backups/postgres/$(date +%Y%m%d_%H%M%S).sql?account=myaccount&key=KEY" \
+dbbackup backup single production_db \
+  --cloud "azure://prod-backups/postgres/?account=myaccount&key=KEY" \
   --compression 6
 ```
 
@@ -208,10 +200,7 @@ dbbackup backup postgres \
 
 ```bash
 # Backup entire PostgreSQL cluster to Azure
-dbbackup backup postgres \
-  --host localhost \
-  --all-databases \
-  --output-dir /backups \
+dbbackup backup cluster \
   --cloud "azure://prod-backups/postgres/cluster/?account=myaccount&key=KEY"
 ```
 
@@ -257,13 +246,9 @@ dbbackup cleanup "azure://prod-backups/postgres/?account=myaccount&key=KEY" --ke
 #!/bin/bash
 # Azure backup script (run via cron)
 
-DATE=$(date +%Y%m%d_%H%M%S)
-AZURE_URI="azure://prod-backups/postgres/${DATE}.sql?account=myaccount&key=${AZURE_STORAGE_KEY}"
+AZURE_URI="azure://prod-backups/postgres/?account=myaccount&key=${AZURE_STORAGE_KEY}"
 
-dbbackup backup postgres \
-  --host localhost \
-  --database production_db \
-  --output /tmp/backup.sql \
+dbbackup backup single production_db \
   --cloud "${AZURE_URI}" \
   --compression 9
 
@@ -289,35 +274,25 @@ For large files (>256MB), dbbackup automatically uses Azure Block Blob staging:
 
 ```bash
 # Large database backup (automatically uses block blob)
-dbbackup backup postgres \
-  --host localhost \
-  --database huge_db \
-  --output /backups/huge.sql \
-  --cloud "azure://backups/huge.sql?account=myaccount&key=KEY"
+dbbackup backup single huge_db \
+  --cloud "azure://backups/?account=myaccount&key=KEY"
 ```
 
 ### Progress Tracking
 
 ```bash
 # Backup with progress display
-dbbackup backup postgres \
-  --host localhost \
-  --database mydb \
-  --output backup.sql \
-  --cloud "azure://backups/backup.sql?account=myaccount&key=KEY" \
-  --progress
+dbbackup backup single mydb \
+  --cloud "azure://backups/?account=myaccount&key=KEY"
 ```
 
 ### Concurrent Operations
 
 ```bash
-# Backup multiple databases in parallel
-dbbackup backup postgres \
-  --host localhost \
-  --all-databases \
-  --output-dir /backups \
+# Backup cluster with parallel jobs
+dbbackup backup cluster \
   --cloud "azure://backups/cluster/?account=myaccount&key=KEY" \
-  --parallelism 4
+  --jobs 4
 ```
 
 ### Custom Metadata
@@ -365,11 +340,8 @@ Endpoint: http://localhost:10000/devstoreaccount1
 
 ```bash
 # Backup to Azurite
-dbbackup backup postgres \
-  --host localhost \
-  --database testdb \
-  --output test.sql \
-  --cloud "azure://test-backups/test.sql?endpoint=http://localhost:10000&account=devstoreaccount1&key=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw=="
+dbbackup backup single testdb \
+  --cloud "azure://test-backups/?endpoint=http://localhost:10000&account=devstoreaccount1&key=Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw=="
 ```
 
 ### Run Integration Tests
@@ -492,8 +464,8 @@ Tests include:
 Enable debug mode:
 
 ```bash
-dbbackup backup postgres \
-  --cloud "azure://container/backup.sql?account=myaccount&key=KEY" \
+dbbackup backup single mydb \
+  --cloud "azure://container/?account=myaccount&key=KEY" \
   --debug
 ```
 

CHANGELOG.md

@@ -5,6 +5,101 @@ All notable changes to dbbackup will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.40.0] - 2026-01-05 "The Diagnostician"
+
+### Added - 🔍 Restore Diagnostics & Error Reporting
+
+**Backup Diagnosis Command:**
+- `restore diagnose <archive>` - Deep analysis of backup files before restore
+- Detects truncated dumps, corrupted archives, incomplete COPY blocks
+- PGDMP signature validation for PostgreSQL custom format
+- Gzip integrity verification with decompression test
+- `pg_restore --list` validation for custom format archives
+- `--deep` flag for exhaustive line-by-line analysis
+- `--json` flag for machine-readable output
+- Cluster archive diagnosis scans all contained dumps
+
+**Detailed Error Reporting:**
+- Comprehensive error collector captures stderr during restore
+- Ring buffer prevents OOM on high-error restores (2M+ errors)
+- Error classification with actionable hints and recommendations
+- `--save-debug-log <path>` saves JSON report on failure
+- Reports include: exit codes, last errors, line context, tool versions
+- Automatic recommendations based on error patterns
+
+**TUI Restore Enhancements:**
+- **Dump validity** safety check runs automatically before restore
+- Detects truncated/corrupted backups in restore preview
+- Press **`d`** to toggle debug log saving in Advanced Options
+- Debug logs saved to `/tmp/dbbackup-restore-debug-*.json` on failure
+- Press **`d`** in archive browser to run diagnosis on any backup
+
+**New Commands:**
+- `restore diagnose` - Analyze backup file integrity and structure
+
+**New Flags:**
+- `--save-debug-log <path>` - Save detailed JSON error report on failure
+- `--diagnose` - Run deep diagnosis before cluster restore
+- `--deep` - Enable exhaustive diagnosis (line-by-line analysis)
+- `--json` - Output diagnosis in JSON format
+- `--keep-temp` - Keep temporary files after diagnosis
+- `--verbose` - Show detailed diagnosis progress
+
+### Technical Details
+- 1,200+ lines of new diagnostic code
+- Error classification system with 15+ error patterns
+- Ring buffer stderr capture (1MB max, 10K lines)
+- Zero memory growth on high-error restores
+- Full TUI integration for diagnostics
+
+---
+
+## [3.2.0] - 2025-12-13 "The Margin Eraser"
+
+### Added - 🚀 Physical Backup Revolution
+
+**MySQL Clone Plugin Integration:**
+- Native physical backup using MySQL 8.0.17+ Clone Plugin
+- No XtraBackup dependency - pure Go implementation
+- Real-time progress monitoring via performance_schema
+- Support for both local and remote clone operations
+
+**Filesystem Snapshot Orchestration:**
+- LVM snapshot support with automatic cleanup
+- ZFS snapshot integration with send/receive
+- Btrfs subvolume snapshot support
+- Brief table lock (<100ms) for consistency
+- Automatic snapshot backend detection
+
+**Continuous Binlog Streaming:**
+- Real-time binlog capture using MySQL replication protocol
+- Multiple targets: file, compressed file, S3 direct streaming
+- Sub-second RPO without impacting database server
+- Automatic position tracking and checkpointing
+
+**Parallel Cloud Streaming:**
+- Direct database-to-S3 streaming (zero local storage)
+- Configurable worker pool for parallel uploads
+- S3 multipart upload with automatic retry
+- Support for S3, GCS, and Azure Blob Storage
+
+**Smart Engine Selection:**
+- Automatic engine selection based on environment
+- MySQL version detection and capability checking
+- Filesystem type detection for optimal snapshot backend
+- Database size-based recommendations
+
+**New Commands:**
+- `engine list` - List available backup engines
+- `engine info <name>` - Show detailed engine information
+- `backup --engine=<name>` - Use specific backup engine
+
+### Technical Details
+- 7,559 lines of new code
+- Zero new external dependencies
+- 10/10 platform builds successful
+- Full test coverage for new engines
+
 ## [3.1.0] - 2025-11-26
 
 ### Added - 🔄 Point-in-Time Recovery (PITR)
@@ -117,7 +212,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Documentation
 - Added comprehensive PITR.md guide (complete PITR documentation)
 - Updated README.md with PITR section (200+ lines)
-- Added RELEASE_NOTES_v3.1.md (full feature list)
 - Updated CHANGELOG.md with v3.1.0 details
 - Added NOTICE file for Apache License attribution
 - Created comprehensive test suite (tests/pitr_complete_test.go - 700+ lines)

CONTRIBUTING.md

@@ -17,7 +17,7 @@ Be respectful, constructive, and professional in all interactions. We're buildin
 
 **Bug Report Template:**
 ```
-**Version:** dbbackup v3.1.0
+**Version:** dbbackup v3.40.0
 **OS:** Linux/macOS/BSD
 **Database:** PostgreSQL 14 / MySQL 8.0 / MariaDB 10.6
 **Command:** The exact command that failed
@@ -274,12 +274,11 @@ Fixes #56
 
 1. Update version in `main.go`
 2. Update `CHANGELOG.md`
-3. Create release notes (`RELEASE_NOTES_vX.Y.Z.md`)
-4. Commit: `git commit -m "Release vX.Y.Z"`
-5. Tag: `git tag -a vX.Y.Z -m "Release vX.Y.Z"`
-6. Push: `git push origin main vX.Y.Z`
-7. Build binaries: `./build_all.sh`
-8. Create GitHub Release with binaries
+3. Commit: `git commit -m "Release vX.Y.Z"`
+4. Tag: `git tag -a vX.Y.Z -m "Release vX.Y.Z"`
+5. Push: `git push origin main vX.Y.Z`
+6. Build binaries: `./build_all.sh`
+7. Create GitHub Release with binaries
 
 ## Questions?
 

GCS.md

@@ -28,21 +28,16 @@ This guide covers using **Google Cloud Storage (GCS)** with `dbbackup` for secur
 
 ```bash
 # Backup PostgreSQL to GCS (using ADC)
-dbbackup backup postgres \
-  --host localhost \
-  --database mydb \
-  --output backup.sql \
-  --cloud "gs://mybucket/backups/db.sql"
+dbbackup backup single mydb \
+  --cloud "gs://mybucket/backups/"
 ```
 
 ### 3. Restore from GCS
 
 ```bash
-# Restore from GCS backup
-dbbackup restore postgres \
-  --source "gs://mybucket/backups/db.sql" \
-  --host localhost \
-  --database mydb_restored
+# Download backup from GCS and restore
+dbbackup cloud download "gs://mybucket/backups/mydb.dump.gz" ./mydb.dump.gz
+dbbackup restore single ./mydb.dump.gz --target mydb_restored --confirm
 ```
 
 ## URI Syntax
@@ -107,7 +102,7 @@ gcloud auth application-default login
 gcloud auth activate-service-account --key-file=/path/to/key.json
 
 # Use simplified URI (credentials from environment)
-dbbackup backup postgres --cloud "gs://mybucket/backups/backup.sql"
+dbbackup backup single mydb --cloud "gs://mybucket/backups/"
 ```
 
 ### Method 2: Service Account JSON
@@ -121,14 +116,14 @@ Download service account key from GCP Console:
 
 **Use in URI:**
 ```bash
-dbbackup backup postgres \
-  --cloud "gs://mybucket/backup.sql?credentials=/path/to/service-account.json"
+dbbackup backup single mydb \
+  --cloud "gs://mybucket/?credentials=/path/to/service-account.json"
 ```
 
 **Or via environment:**
 ```bash
 export GOOGLE_APPLICATION_CREDENTIALS="/path/to/service-account.json"
-dbbackup backup postgres --cloud "gs://mybucket/backup.sql"
+dbbackup backup single mydb --cloud "gs://mybucket/"
 ```
 
 ### Method 3: Workload Identity (GKE)
@@ -147,7 +142,7 @@ metadata:
 Then use ADC in your pod:
 
 ```bash
-dbbackup backup postgres --cloud "gs://mybucket/backup.sql"
+dbbackup backup single mydb --cloud "gs://mybucket/"
 ```
 
 ### Required IAM Permissions
@@ -250,11 +245,8 @@ gsutil mb -l eu gs://mybucket/
 
 ```bash
 # PostgreSQL backup with automatic GCS upload
-dbbackup backup postgres \
-  --host localhost \
-  --database production_db \
-  --output /backups/db.sql \
-  --cloud "gs://prod-backups/postgres/$(date +%Y%m%d_%H%M%S).sql" \
+dbbackup backup single production_db \
+  --cloud "gs://prod-backups/postgres/" \
   --compression 6
 ```
 
@@ -262,10 +254,7 @@ dbbackup backup postgres \
 
 ```bash
 # Backup entire PostgreSQL cluster to GCS
-dbbackup backup postgres \
-  --host localhost \
-  --all-databases \
-  --output-dir /backups \
+dbbackup backup cluster \
   --cloud "gs://prod-backups/postgres/cluster/"
 ```
 
@@ -314,13 +303,9 @@ dbbackup cleanup "gs://prod-backups/postgres/" --keep 7
 #!/bin/bash
 # GCS backup script (run via cron)
 
-DATE=$(date +%Y%m%d_%H%M%S)
-GCS_URI="gs://prod-backups/postgres/${DATE}.sql"
+GCS_URI="gs://prod-backups/postgres/"
 
-dbbackup backup postgres \
-  --host localhost \
-  --database production_db \
-  --output /tmp/backup.sql \
+dbbackup backup single production_db \
   --cloud "${GCS_URI}" \
   --compression 9
 
@@ -360,35 +345,25 @@ For large files, dbbackup automatically uses GCS chunked upload:
 
 ```bash
 # Large database backup (automatically uses chunked upload)
-dbbackup backup postgres \
-  --host localhost \
-  --database huge_db \
-  --output /backups/huge.sql \
-  --cloud "gs://backups/huge.sql"
+dbbackup backup single huge_db \
+  --cloud "gs://backups/"
 ```
 
 ### Progress Tracking
 
 ```bash
 # Backup with progress display
-dbbackup backup postgres \
-  --host localhost \
-  --database mydb \
-  --output backup.sql \
-  --cloud "gs://backups/backup.sql" \
-  --progress
+dbbackup backup single mydb \
+  --cloud "gs://backups/"
 ```
 
 ### Concurrent Operations
 
 ```bash
-# Backup multiple databases in parallel
-dbbackup backup postgres \
-  --host localhost \
-  --all-databases \
-  --output-dir /backups \
+# Backup cluster with parallel jobs
+dbbackup backup cluster \
   --cloud "gs://backups/cluster/" \
-  --parallelism 4
+  --jobs 4
 ```
 
 ### Custom Metadata
@@ -460,11 +435,8 @@ curl -X POST "http://localhost:4443/storage/v1/b?project=test-project" \
 
 ```bash
 # Backup to fake-gcs-server
-dbbackup backup postgres \
-  --host localhost \
-  --database testdb \
-  --output test.sql \
-  --cloud "gs://test-backups/test.sql?endpoint=http://localhost:4443/storage/v1"
+dbbackup backup single testdb \
+  --cloud "gs://test-backups/?endpoint=http://localhost:4443/storage/v1"
 ```
 
 ### Run Integration Tests
@@ -593,8 +565,8 @@ Tests include:
 Enable debug mode:
 
 ```bash
-dbbackup backup postgres \
-  --cloud "gs://bucket/backup.sql" \
+dbbackup backup single mydb \
+  --cloud "gs://bucket/" \
   --debug
 ```
 

MYSQL_PITR.md

@@ -110,10 +110,12 @@ dbbackup pitr mysql-enable --archive-dir /backups/binlog_archive
 ### 3. Create a Base Backup
 
 ```bash
-# Create a PITR-capable backup
-dbbackup backup single mydb --pitr
+# Create a backup - binlog position is automatically recorded
+dbbackup backup single mydb
 ```
 
+> **Note:** All backups automatically capture the current binlog position when PITR is enabled at the MySQL level. This position is stored in the backup metadata and used as the starting point for binlog replay during recovery.
+
 ### 4. Start Binlog Archiving
 
 ```bash

README.md

@@ -54,7 +54,7 @@ Download from [releases](https://git.uuxo.net/UUXO/dbbackup/releases):
 
 ```bash
 # Linux x86_64
-wget https://git.uuxo.net/UUXO/dbbackup/releases/download/v3.1.0/dbbackup-linux-amd64
+wget https://git.uuxo.net/UUXO/dbbackup/releases/download/v3.40.0/dbbackup-linux-amd64
 chmod +x dbbackup-linux-amd64
 sudo mv dbbackup-linux-amd64 /usr/local/bin/dbbackup
 ```
@@ -161,11 +161,15 @@ Cluster Restore Options
 
 Safety Checks
   [OK] Archive integrity verified
+  [OK] Dump validity verified
   [OK] Disk space: 140 GB available
   [OK] Required tools found
   [OK] Target database accessible
 
-c: Toggle cleanup | Enter: Proceed | Esc: Cancel
+Advanced Options
+  ✗ Debug Log: false (press 'd' to toggle)
+
+c: Toggle cleanup | d: Debug log | Enter: Proceed | Esc: Cancel
 ```
 
 **Backup Manager:**
@@ -180,7 +184,7 @@ FILENAME                              FORMAT                SIZE        MODIFIED
   [OK] myapp_prod_20250114.dump.gz    PostgreSQL Custom     12.3 GB     2025-01-14
   [!!] users_db_20241220.dump.gz      PostgreSQL Custom     850 MB      2024-12-20
 
-r: Restore | v: Verify | i: Info | d: Delete | R: Refresh | Esc: Back
+r: Restore | v: Verify | i: Info | d: Diagnose | D: Delete | R: Refresh | Esc: Back
 ```
 
 **Configuration Settings:**
@@ -240,6 +244,12 @@ dbbackup restore single backup.dump --target myapp_db --create --confirm
 # Restore cluster
 dbbackup restore cluster cluster_backup.tar.gz --confirm
 
+# Restore with debug logging (saves detailed error report on failure)
+dbbackup restore cluster backup.tar.gz --save-debug-log /tmp/restore-debug.json --confirm
+
+# Diagnose backup before restore
+dbbackup restore diagnose backup.dump.gz --deep
+
 # Cloud backup
 dbbackup backup single mydb --cloud s3://my-bucket/backups/
 
@@ -257,6 +267,7 @@ dbbackup backup single mydb --dry-run
 | `restore single` | Restore single database |
 | `restore cluster` | Restore full cluster |
 | `restore pitr` | Point-in-Time Recovery |
+| `restore diagnose` | Diagnose backup file integrity |
 | `verify-backup` | Verify backup integrity |
 | `cleanup` | Remove old backups |
 | `status` | Check connection status |
@@ -287,8 +298,8 @@ dbbackup backup single mydb --dry-run
 | `--cloud` | Cloud storage URI | - |
 | `--encrypt` | Enable encryption | false |
 | `--dry-run, -n` | Run preflight checks only | false |
-| `--notify` | Enable notifications | false |
 | `--debug` | Enable debug logging | false |
+| `--save-debug-log` | Save error report to file on failure | - |
 
 ## Encryption
 
@@ -436,9 +447,64 @@ dbbackup backup cluster -n  # Short flag
   Ready to backup. Remove --dry-run to execute.
 ```
 
+## Backup Diagnosis
+
+Diagnose backup files before restore to detect corruption or truncation:
+
+```bash
+# Diagnose a backup file
+dbbackup restore diagnose backup.dump.gz
+
+# Deep analysis (line-by-line COPY block verification)
+dbbackup restore diagnose backup.dump.gz --deep
+
+# JSON output for automation
+dbbackup restore diagnose backup.dump.gz --json
+
+# Diagnose cluster archive (checks all contained dumps)
+dbbackup restore diagnose cluster_backup.tar.gz --deep
+```
+
+**Checks performed:**
+- PGDMP signature validation (PostgreSQL custom format)
+- Gzip integrity verification
+- COPY block termination (detects truncated dumps)
+- `pg_restore --list` validation
+- Archive structure analysis
+
+**Example output:**
+```
+🔍 Backup Diagnosis Report
+══════════════════════════════════════════════════════════════
+
+📁 File: mydb_20260105.dump.gz
+   Format: PostgreSQL Custom (gzip)
+   Size: 2.5 GB
+
+🔬 Analysis Results:
+   ✅ Gzip integrity: Valid
+   ✅ PGDMP signature: Valid
+   ✅ pg_restore --list: Success (245 objects)
+   ❌ COPY block check: TRUNCATED
+
+⚠️  Issues Found:
+   - COPY block for table 'orders' not terminated
+   - Dump appears truncated at line 1,234,567
+
+💡 Recommendations:
+   - Re-run the backup for this database
+   - Check disk space on backup server
+   - Verify network stability during backup
+```
+
+**In Interactive Mode:**
+- Press `d` in archive browser to diagnose any backup
+- Automatic dump validity check in restore preview
+- Toggle debug logging with `d` in restore options
+
 ## Notifications
 
-Get alerted on backup events via email or webhooks.
+Get alerted on backup events via email or webhooks. Configure via environment variables.
 
 ### SMTP Email
 
@@ -451,8 +517,8 @@ export NOTIFY_SMTP_PASSWORD="secret"
 export NOTIFY_SMTP_FROM="dbbackup@example.com"
 export NOTIFY_SMTP_TO="admin@example.com,dba@example.com"
 
-# Enable notifications
-dbbackup backup single mydb --notify
+# Run backup (notifications triggered when SMTP is configured)
+dbbackup backup single mydb
 ```
 
 ### Webhooks
@@ -465,7 +531,8 @@ export NOTIFY_WEBHOOK_SECRET="signing-secret"  # Optional HMAC signing
 # Slack webhook
 export NOTIFY_WEBHOOK_URL="https://hooks.slack.com/services/T00/B00/XXX"
 
-dbbackup backup single mydb --notify
+# Run backup (notifications triggered when webhook is configured)
+dbbackup backup single mydb
 ```
 
 **Webhook payload:**

RELEASE_NOTES_v3.1.md

@@ -1,396 +0,0 @@
-# dbbackup v3.1.0 - Enterprise Backup Solution
-
-**Released:** November 26, 2025
-
----
-
-## 🎉 Major Features
-
-### Point-in-Time Recovery (PITR)
-Complete PostgreSQL Point-in-Time Recovery implementation:
-
-- **WAL Archiving**: Continuous archiving of Write-Ahead Log files
-- **WAL Monitoring**: Real-time monitoring of archive status and statistics
-- **Timeline Management**: Track and visualize PostgreSQL timeline branching
-- **Recovery Targets**: Restore to any point in time:
-  - Specific timestamp (`--target-time "2024-11-26 12:00:00"`)
-  - Transaction ID (`--target-xid 1000000`)
-  - Log Sequence Number (`--target-lsn "0/3000000"`)
-  - Named restore point (`--target-name before_migration`)
-  - Earliest consistent point (`--target-immediate`)
-- **Version Support**: Both PostgreSQL 12+ (modern) and legacy formats
-- **Recovery Actions**: Promote to primary, pause for inspection, or shutdown
-- **Comprehensive Testing**: 700+ lines of tests with 100% pass rate
-
-**New Commands:**
-- `pitr enable/disable/status` - PITR configuration management
-- `wal archive/list/cleanup/timeline` - WAL archive operations
-- `restore pitr` - Point-in-time recovery with multiple target types
-
-### Cloud Storage Integration
-Multi-cloud backend support with streaming efficiency:
-
-- **Amazon S3 / MinIO**: Full S3-compatible storage support
-- **Azure Blob Storage**: Native Azure integration
-- **Google Cloud Storage**: GCS backend support
-- **Streaming Operations**: Memory-efficient uploads/downloads
-- **Cloud-Native**: Direct backup to cloud, no local disk required
-
-**Features:**
-- Automatic multipart uploads for large files
-- Resumable downloads with retry logic
-- Cloud-side encryption support
-- Metadata preservation in cloud storage
-
-### Incremental Backups
-Space-efficient backup strategies:
-
-- **PostgreSQL**: File-level incremental backups
-  - Track changed files since base backup
-  - Automatic base backup detection
-  - Efficient restore chain resolution
-  
-- **MySQL/MariaDB**: Binary log incremental backups
-  - Capture changes via binlog
-  - Automatic log rotation handling
-  - Point-in-time restore capability
-
-**Benefits:**
-- 70-90% reduction in backup size
-- Faster backup completion times
-- Automated backup chain management
-- Intelligent dependency tracking
-
-### AES-256-GCM Encryption
-Military-grade encryption for data protection:
-
-- **Algorithm**: AES-256-GCM authenticated encryption
-- **Key Derivation**: PBKDF2-SHA256 with 600,000 iterations (OWASP 2023)
-- **Streaming**: Memory-efficient for large backups
-- **Key Sources**: File (raw/base64), environment variable, or passphrase
-- **Auto-Detection**: Restore automatically detects encrypted backups
-- **Tamper Protection**: Authenticated encryption prevents tampering
-
-**Security:**
-- Unique nonce per encryption (no key reuse)
-- Cryptographically secure random generation
-- 56-byte header with algorithm metadata
-- ~1-2 GB/s encryption throughput
-
-### Foundation Features
-Production-ready backup operations:
-
-- **SHA-256 Verification**: Cryptographic backup integrity checking
-- **Intelligent Retention**: Day-based policies with minimum backup guarantees
-- **Safe Cleanup**: Dry-run mode, safety checks, detailed reporting
-- **Multi-Database**: PostgreSQL, MySQL, MariaDB support
-- **Interactive TUI**: Beautiful terminal UI with progress tracking
-- **CLI Mode**: Full command-line interface for automation
-- **Cross-Platform**: Linux, macOS, FreeBSD, OpenBSD, NetBSD
-- **Docker Support**: Official container images
-- **100% Test Coverage**: Comprehensive test suite
-
----
-
-## ✅ Production Validated
-
-**Real-World Deployment:**
-- ✅ 2 production hosts in production environment
-- ✅ 8 databases backed up nightly
-- ✅ 30-day retention with minimum 5 backups
-- ✅ ~10MB/night backup volume
-- ✅ Scheduled at 02:09 and 02:25 CET
-- ✅ **Resolved 4-day backup failure immediately**
-
-**User Feedback (Ansible Claude):**
-> "cleanup command is SO gut, dass es alle verwenden sollten"
-
-> "--dry-run feature: chef's kiss!" 💋
-
-> "Modern tooling in place, pragmatic and maintainable"
-
-> "CLI design: Professional & polished"
-
-**Impact:**
-- Fixed failing backup infrastructure on first deployment
-- Stable operation in production environment
-- Positive feedback from DevOps team
-- Validation of feature set and UX design
-
----
-
-## 📦 Installation
-
-### Download Pre-compiled Binary
-
-**Linux (x86_64):**
-```bash
-wget https://git.uuxo.net/PlusOne/dbbackup/releases/download/v3.1.0/dbbackup-linux-amd64
-chmod +x dbbackup-linux-amd64
-sudo mv dbbackup-linux-amd64 /usr/local/bin/dbbackup
-```
-
-**Linux (ARM64):**
-```bash
-wget https://git.uuxo.net/PlusOne/dbbackup/releases/download/v3.1.0/dbbackup-linux-arm64
-chmod +x dbbackup-linux-arm64
-sudo mv dbbackup-linux-arm64 /usr/local/bin/dbbackup
-```
-
-**macOS (Intel):**
-```bash
-wget https://git.uuxo.net/PlusOne/dbbackup/releases/download/v3.1.0/dbbackup-darwin-amd64
-chmod +x dbbackup-darwin-amd64
-sudo mv dbbackup-darwin-amd64 /usr/local/bin/dbbackup
-```
-
-**macOS (Apple Silicon):**
-```bash
-wget https://git.uuxo.net/PlusOne/dbbackup/releases/download/v3.1.0/dbbackup-darwin-arm64
-chmod +x dbbackup-darwin-arm64
-sudo mv dbbackup-darwin-arm64 /usr/local/bin/dbbackup
-```
-
-### Build from Source
-
-```bash
-git clone https://git.uuxo.net/PlusOne/dbbackup.git
-cd dbbackup
-go build -o dbbackup
-sudo mv dbbackup /usr/local/bin/
-```
-
-### Docker
-
-```bash
-docker pull git.uuxo.net/PlusOne/dbbackup:v3.1.0
-docker pull git.uuxo.net/PlusOne/dbbackup:latest
-```
-
----
-
-## 🚀 Quick Start Examples
-
-### Basic Backup
-```bash
-# Simple database backup
-dbbackup backup single mydb
-
-# Backup with verification
-dbbackup backup single mydb
-dbbackup verify mydb_backup.sql.gz
-```
-
-### Cloud Backup
-```bash
-# Backup to S3
-dbbackup backup single mydb --cloud s3://my-bucket/backups/
-
-# Backup to Azure
-dbbackup backup single mydb --cloud azure://container/backups/
-
-# Backup to GCS
-dbbackup backup single mydb --cloud gs://my-bucket/backups/
-```
-
-### Encrypted Backup
-```bash
-# Generate encryption key
-head -c 32 /dev/urandom | base64 > encryption.key
-
-# Encrypted backup
-dbbackup backup single mydb --encrypt --encryption-key-file encryption.key
-
-# Restore (automatic decryption)
-dbbackup restore single mydb_backup.sql.gz --encryption-key-file encryption.key
-```
-
-### Incremental Backup
-```bash
-# Create base backup
-dbbackup backup single mydb --backup-type full
-
-# Create incremental backup
-dbbackup backup single mydb --backup-type incremental \
-  --base-backup mydb_base_20241126_120000.tar.gz
-
-# Restore (automatic chain resolution)
-dbbackup restore single mydb_incr_20241126_150000.tar.gz
-```
-
-### Point-in-Time Recovery
-```bash
-# Enable PITR
-dbbackup pitr enable --archive-dir /backups/wal_archive
-
-# Take base backup
-pg_basebackup -D /backups/base.tar.gz -Ft -z -P
-
-# Perform PITR
-dbbackup restore pitr \
-  --base-backup /backups/base.tar.gz \
-  --wal-archive /backups/wal_archive \
-  --target-time "2024-11-26 12:00:00" \
-  --target-dir /var/lib/postgresql/14/restored
-
-# Monitor WAL archiving
-dbbackup pitr status
-dbbackup wal list
-```
-
-### Retention & Cleanup
-```bash
-# Cleanup old backups (dry-run first!)
-dbbackup cleanup --retention-days 30 --min-backups 5 --dry-run
-
-# Actually cleanup
-dbbackup cleanup --retention-days 30 --min-backups 5
-```
-
-### Cluster Operations
-```bash
-# Backup entire cluster
-dbbackup backup cluster
-
-# Restore entire cluster
-dbbackup restore cluster --backups /path/to/backups/ --confirm
-```
-
----
-
-## 🔮 What's Next (v3.2)
-
-Based on production feedback from Ansible Claude:
-
-### High Priority
-1. **Config File Support** (2-3h)
-   - Persist flags like `--allow-root` in `.dbbackup.conf`
-   - Per-directory configuration management
-   - Better automation support
-
-2. **Socket Auth Auto-Detection** (1-2h)
-   - Auto-detect Unix socket authentication
-   - Skip password prompts for socket connections
-   - Improved UX for root users
-
-### Medium Priority
-3. **Inline Backup Verification** (2-3h)
-   - Automatic verification after backup
-   - Immediate corruption detection
-   - Better workflow integration
-
-4. **Progress Indicators** (4-6h)
-   - Progress bars for mysqldump operations
-   - Real-time backup size tracking
-   - ETA for large backups
-
-### Additional Features
-5. **Ansible Module** (4-6h)
-   - Native Ansible integration
-   - Declarative backup configuration
-   - DevOps automation support
-
----
-
-## 📊 Performance Metrics
-
-**Backup Performance:**
-- PostgreSQL: 50-150 MB/s (network dependent)
-- MySQL: 30-100 MB/s (with compression)
-- Encryption: ~1-2 GB/s (streaming)
-- Compression: 70-80% size reduction (typical)
-
-**PITR Performance:**
-- WAL archiving: 100-200 MB/s
-- WAL encryption: ~1-2 GB/s
-- Recovery replay: 10-100 MB/s (disk I/O dependent)
-
-**Resource Usage:**
-- Memory: ~1GB constant (streaming architecture)
-- CPU: 1-4 cores (configurable)
-- Disk I/O: Streaming (no intermediate files)
-
----
-
-## 🏗️ Architecture Highlights
-
-**Split-Brain Development:**
-- Human architects system design
-- AI implements features and tests
-- Micro-task decomposition (1-2h phases)
-- Progressive enhancement approach
-- **Result:** 52% faster development (5.75h vs 12h planned)
-
-**Key Innovations:**
-- Streaming architecture for constant memory usage
-- Interface-first design for clean modularity
-- Comprehensive test coverage (700+ test lines)
-- Production validation in parallel with development
-
----
-
-## 📄 Documentation
-
-**Core Documentation:**
-- [README.md](README.md) - Complete feature overview and setup
-- [PITR.md](PITR.md) - Comprehensive PITR guide
-- [DOCKER.md](DOCKER.md) - Docker usage and deployment
-- [CHANGELOG.md](CHANGELOG.md) - Detailed version history
-
-**Getting Started:**
-- [QUICKRUN.md](QUICKRUN.MD) - Quick start guide
-- [PROGRESS_IMPLEMENTATION.md](PROGRESS_IMPLEMENTATION.md) - Progress tracking
-
----
-
-## 📜 License
-
-Apache License 2.0
-
-Copyright 2025 dbbackup Project
-
-Licensed under the Apache License, Version 2.0. See [LICENSE](LICENSE) for details.
-
----
-
-## 🙏 Credits
-
-**Development:**
-- Built using Multi-Claude collaboration architecture
-- Split-brain development pattern (human architecture + AI implementation)
-- 5.75 hours intensive development (52% time savings)
-
-**Production Validation:**
-- Deployed in production environments
-- Real-world testing and feedback
-- DevOps validation and feature requests
-
-**Technologies:**
-- Go 1.21+
-- PostgreSQL 9.5-17
-- MySQL/MariaDB 5.7+
-- AWS SDK, Azure SDK, Google Cloud SDK
-- Cobra CLI framework
-
----
-
-## 🐛 Known Issues
-
-None reported in production deployment.
-
-If you encounter issues, please report them at:
-https://git.uuxo.net/PlusOne/dbbackup/issues
-
----
-
-## 📞 Support
-
-**Documentation:** See [README.md](README.md) and [PITR.md](PITR.md)  
-**Issues:** https://git.uuxo.net/PlusOne/dbbackup/issues  
-**Repository:** https://git.uuxo.net/PlusOne/dbbackup
-
----
-
-**Thank you for using dbbackup!** 🎉
-
-*Professional database backup and restore utility for PostgreSQL, MySQL, and MariaDB.*

SECURITY.md

@@ -85,7 +85,7 @@ We release security updates for the following versions:
 - ❌ Never store unencrypted backups on public storage
 
 **Docker Usage:**
-- ✅ Use specific version tags (`:v3.1.0` not `:latest`)
+- ✅ Use specific version tags (`:v3.2.0` not `:latest`)
 - ✅ Run as non-root user (default in our image)
 - ✅ Mount volumes read-only when possible
 - ✅ Use Docker secrets for credentials

VEEAM_ALTERNATIVE.md

@@ -43,7 +43,7 @@ What are you actually getting?
 ```bash
 # Physical backup at InnoDB page level
 # No XtraBackup. No external tools. Pure Go.
-dbbackup backup --engine=clone --output=s3://bucket/backup
+dbbackup backup single mydb --db-type mysql --cloud s3://bucket/backups/
 ```
 
 ### Filesystem Snapshots
@@ -78,10 +78,10 @@ dbbackup backup --engine=streaming --parallel-workers=8
 **Day 1**: Run dbbackup alongside existing solution
 ```bash
 # Test backup
-dbbackup backup --database=mydb --output=s3://test-bucket/
+dbbackup backup single mydb --cloud s3://test-bucket/
 
 # Verify integrity
-dbbackup verify s3://test-bucket/backup.sql.gz.enc
+dbbackup verify s3://test-bucket/mydb_20260115.dump.gz
 ```
 
 **Week 1**: Compare backup times, storage costs, recovery speed
@@ -112,10 +112,9 @@ curl -LO https://github.com/UUXO/dbbackup/releases/latest/download/dbbackup_linu
 chmod +x dbbackup_linux_amd64
 
 # Your first backup
-./dbbackup_linux_amd64 backup \
-  --database=production \
-  --engine=auto \
-  --output=s3://my-backups/$(date +%Y%m%d)/
+./dbbackup_linux_amd64 backup single production \
+  --db-type mysql \
+  --cloud s3://my-backups/
 ```
 
 ## The Bottom Line
@@ -131,4 +130,4 @@ Every dollar you spend on backup licensing is a dollar not spent on:
 
 *Apache 2.0 Licensed. Free forever. No sales calls required.*
 
-[GitHub](https://github.com/UUXO/dbbackup) | [Documentation](https://github.com/UUXO/dbbackup#readme) | [Release Notes](RELEASE_NOTES_v3.2.md)
+[GitHub](https://github.com/UUXO/dbbackup) | [Documentation](https://github.com/UUXO/dbbackup#readme) | [Changelog](CHANGELOG.md)

build_all.sh

@@ -15,7 +15,7 @@ echo "🔧 Using Go version: $GO_VERSION"
 
 # Configuration
 APP_NAME="dbbackup"
-VERSION="3.1.0"
+VERSION="3.40.0"
 BUILD_TIME=$(date -u '+%Y-%m-%d_%H:%M:%S_UTC')
 GIT_COMMIT=$(git rev-parse --short HEAD 2>/dev/null || echo "unknown")
 BIN_DIR="bin"

cmd/restore.go

@@ -33,6 +33,13 @@ var (
 	restoreNoProgress   bool
 	restoreWorkdir      string
 	restoreCleanCluster bool
+	restoreDiagnose     bool   // Run diagnosis before restore
+	restoreSaveDebugLog string // Path to save debug log on failure
+
+	// Diagnose flags
+	diagnoseJSON       bool
+	diagnoseDeep       bool
+	diagnoseKeepTemp   bool
 
 	// Encryption flags
 	restoreEncryptionKeyFile string
@@ -214,12 +221,53 @@ Examples:
 	RunE: runRestorePITR,
 }
 
+// restoreDiagnoseCmd diagnoses backup files before restore
+var restoreDiagnoseCmd = &cobra.Command{
+	Use:   "diagnose [archive-file]",
+	Short: "Diagnose backup file integrity and format",
+	Long: `Perform deep analysis of backup files to detect issues before restore.
+
+This command validates backup archives and provides detailed diagnostics
+including truncation detection, format verification, and COPY block integrity.
+
+Use this when:
+  - Restore fails with syntax errors
+  - You suspect backup corruption or truncation
+  - You want to verify backup integrity before restore
+  - Restore reports millions of errors
+
+Checks performed:
+  - File format detection (custom dump vs SQL)
+  - PGDMP signature verification
+  - Gzip integrity validation
+  - COPY block termination check
+  - pg_restore --list verification
+  - Cluster archive structure validation
+
+Examples:
+  # Diagnose a single dump file
+  dbbackup restore diagnose mydb.dump.gz
+
+  # Diagnose with verbose output
+  dbbackup restore diagnose mydb.sql.gz --verbose
+
+  # Diagnose cluster archive and all contained dumps
+  dbbackup restore diagnose cluster_backup.tar.gz --deep
+
+  # Output as JSON for scripting
+  dbbackup restore diagnose mydb.dump --json
+`,
+	Args: cobra.ExactArgs(1),
+	RunE: runRestoreDiagnose,
+}
+
 func init() {
 	rootCmd.AddCommand(restoreCmd)
 	restoreCmd.AddCommand(restoreSingleCmd)
 	restoreCmd.AddCommand(restoreClusterCmd)
 	restoreCmd.AddCommand(restoreListCmd)
 	restoreCmd.AddCommand(restorePITRCmd)
+	restoreCmd.AddCommand(restoreDiagnoseCmd)
 
 	// Single restore flags
 	restoreSingleCmd.Flags().BoolVar(&restoreConfirm, "confirm", false, "Confirm and execute restore (required)")
@@ -232,6 +280,8 @@ func init() {
 	restoreSingleCmd.Flags().BoolVar(&restoreNoProgress, "no-progress", false, "Disable progress indicators")
 	restoreSingleCmd.Flags().StringVar(&restoreEncryptionKeyFile, "encryption-key-file", "", "Path to encryption key file (required for encrypted backups)")
 	restoreSingleCmd.Flags().StringVar(&restoreEncryptionKeyEnv, "encryption-key-env", "DBBACKUP_ENCRYPTION_KEY", "Environment variable containing encryption key")
+	restoreSingleCmd.Flags().BoolVar(&restoreDiagnose, "diagnose", false, "Run deep diagnosis before restore to detect corruption/truncation")
+	restoreSingleCmd.Flags().StringVar(&restoreSaveDebugLog, "save-debug-log", "", "Save detailed error report to file on failure (e.g., /tmp/restore-debug.json)")
 
 	// Cluster restore flags
 	restoreClusterCmd.Flags().BoolVar(&restoreConfirm, "confirm", false, "Confirm and execute restore (required)")
@@ -244,6 +294,8 @@ func init() {
 	restoreClusterCmd.Flags().BoolVar(&restoreNoProgress, "no-progress", false, "Disable progress indicators")
 	restoreClusterCmd.Flags().StringVar(&restoreEncryptionKeyFile, "encryption-key-file", "", "Path to encryption key file (required for encrypted backups)")
 	restoreClusterCmd.Flags().StringVar(&restoreEncryptionKeyEnv, "encryption-key-env", "DBBACKUP_ENCRYPTION_KEY", "Environment variable containing encryption key")
+	restoreClusterCmd.Flags().BoolVar(&restoreDiagnose, "diagnose", false, "Run deep diagnosis on all dumps before restore")
+	restoreClusterCmd.Flags().StringVar(&restoreSaveDebugLog, "save-debug-log", "", "Save detailed error report to file on failure (e.g., /tmp/restore-debug.json)")
 
 	// PITR restore flags
 	restorePITRCmd.Flags().StringVar(&pitrBaseBackup, "base-backup", "", "Path to base backup file (.tar.gz) (required)")
@@ -264,6 +316,117 @@ func init() {
 	restorePITRCmd.MarkFlagRequired("base-backup")
 	restorePITRCmd.MarkFlagRequired("wal-archive")
 	restorePITRCmd.MarkFlagRequired("target-dir")
+
+	// Diagnose flags
+	restoreDiagnoseCmd.Flags().BoolVar(&diagnoseJSON, "json", false, "Output diagnosis as JSON")
+	restoreDiagnoseCmd.Flags().BoolVar(&diagnoseDeep, "deep", false, "For cluster archives, extract and diagnose all contained dumps")
+	restoreDiagnoseCmd.Flags().BoolVar(&diagnoseKeepTemp, "keep-temp", false, "Keep temporary extraction directory (for debugging)")
+	restoreDiagnoseCmd.Flags().BoolVar(&restoreVerbose, "verbose", false, "Show detailed analysis progress")
+}
+
+// runRestoreDiagnose diagnoses backup files
+func runRestoreDiagnose(cmd *cobra.Command, args []string) error {
+	archivePath := args[0]
+
+	// Convert to absolute path
+	if !filepath.IsAbs(archivePath) {
+		absPath, err := filepath.Abs(archivePath)
+		if err != nil {
+			return fmt.Errorf("invalid archive path: %w", err)
+		}
+		archivePath = absPath
+	}
+
+	// Check if file exists
+	if _, err := os.Stat(archivePath); err != nil {
+		return fmt.Errorf("archive not found: %s", archivePath)
+	}
+
+	log.Info("🔍 Diagnosing backup file", "path", archivePath)
+
+	diagnoser := restore.NewDiagnoser(log, restoreVerbose)
+
+	// Check if it's a cluster archive that needs deep analysis
+	format := restore.DetectArchiveFormat(archivePath)
+
+	if format.IsClusterBackup() && diagnoseDeep {
+		// Create temp directory for extraction
+		tempDir, err := os.MkdirTemp("", "dbbackup-diagnose-*")
+		if err != nil {
+			return fmt.Errorf("failed to create temp directory: %w", err)
+		}
+
+		if !diagnoseKeepTemp {
+			defer os.RemoveAll(tempDir)
+		} else {
+			log.Info("Temp directory preserved", "path", tempDir)
+		}
+
+		log.Info("Extracting cluster archive for deep analysis...")
+
+		// Extract and diagnose all dumps
+		results, err := diagnoser.DiagnoseClusterDumps(archivePath, tempDir)
+		if err != nil {
+			return fmt.Errorf("cluster diagnosis failed: %w", err)
+		}
+
+		// Output results
+		var hasErrors bool
+		for _, result := range results {
+			if diagnoseJSON {
+				diagnoser.PrintDiagnosisJSON(result)
+			} else {
+				diagnoser.PrintDiagnosis(result)
+			}
+			if !result.IsValid {
+				hasErrors = true
+			}
+		}
+
+		// Summary
+		if !diagnoseJSON {
+			fmt.Println("\n" + strings.Repeat("=", 70))
+			fmt.Printf("📊 CLUSTER SUMMARY: %d databases analyzed\n", len(results))
+
+			validCount := 0
+			for _, r := range results {
+				if r.IsValid {
+					validCount++
+				}
+			}
+
+			if validCount == len(results) {
+				fmt.Println("✅ All dumps are valid")
+			} else {
+				fmt.Printf("❌ %d/%d dumps have issues\n", len(results)-validCount, len(results))
+			}
+			fmt.Println(strings.Repeat("=", 70))
+		}
+
+		if hasErrors {
+			return fmt.Errorf("one or more dumps have validation errors")
+		}
+		return nil
+	}
+
+	// Single file diagnosis
+	result, err := diagnoser.DiagnoseFile(archivePath)
+	if err != nil {
+		return fmt.Errorf("diagnosis failed: %w", err)
+	}
+
+	if diagnoseJSON {
+		diagnoser.PrintDiagnosisJSON(result)
+	} else {
+		diagnoser.PrintDiagnosis(result)
+	}
+
+	if !result.IsValid {
+		return fmt.Errorf("backup file has validation errors")
+	}
+
+	log.Info("✅ Backup file appears valid")
+	return nil
 }
 
 // runRestoreSingle restores a single database
@@ -402,6 +565,12 @@ func runRestoreSingle(cmd *cobra.Command, args []string) error {
 	// Create restore engine
 	engine := restore.New(cfg, log, db)
 	
+	// Enable debug logging if requested
+	if restoreSaveDebugLog != "" {
+		engine.SetDebugLogPath(restoreSaveDebugLog)
+		log.Info("Debug logging enabled", "output", restoreSaveDebugLog)
+	}
+
 	// Setup signal handling
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -416,6 +585,37 @@ func runRestoreSingle(cmd *cobra.Command, args []string) error {
 		cancel()
 	}()
 
+	// Run pre-restore diagnosis if requested
+	if restoreDiagnose {
+		log.Info("🔍 Running pre-restore diagnosis...")
+		
+		diagnoser := restore.NewDiagnoser(log, restoreVerbose)
+		result, err := diagnoser.DiagnoseFile(archivePath)
+		if err != nil {
+			return fmt.Errorf("diagnosis failed: %w", err)
+		}
+		
+		diagnoser.PrintDiagnosis(result)
+		
+		if !result.IsValid {
+			log.Error("❌ Pre-restore diagnosis found issues")
+			if result.IsTruncated {
+				log.Error("   The backup file appears to be TRUNCATED")
+			}
+			if result.IsCorrupted {
+				log.Error("   The backup file appears to be CORRUPTED")
+			}
+			fmt.Println("\nUse --force to attempt restore anyway.")
+			
+			if !restoreForce {
+				return fmt.Errorf("aborting restore due to backup file issues")
+			}
+			log.Warn("Continuing despite diagnosis errors (--force enabled)")
+		} else {
+			log.Info("✅ Backup file passed diagnosis")
+		}
+	}
+
 	// Execute restore
 	log.Info("Starting restore...", "database", targetDB)
 
@@ -585,6 +785,12 @@ func runRestoreCluster(cmd *cobra.Command, args []string) error {
 	// Create restore engine
 	engine := restore.New(cfg, log, db)
 	
+	// Enable debug logging if requested
+	if restoreSaveDebugLog != "" {
+		engine.SetDebugLogPath(restoreSaveDebugLog)
+		log.Info("Debug logging enabled", "output", restoreSaveDebugLog)
+	}
+
 	// Setup signal handling
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -620,6 +826,52 @@ func runRestoreCluster(cmd *cobra.Command, args []string) error {
 		log.Info("Database cleanup completed")
 	}
 
+	// Run pre-restore diagnosis if requested
+	if restoreDiagnose {
+		log.Info("🔍 Running pre-restore diagnosis...")
+		
+		// Create temp directory for extraction
+		diagTempDir, err := os.MkdirTemp("", "dbbackup-diagnose-*")
+		if err != nil {
+			return fmt.Errorf("failed to create temp directory for diagnosis: %w", err)
+		}
+		defer os.RemoveAll(diagTempDir)
+		
+		diagnoser := restore.NewDiagnoser(log, restoreVerbose)
+		results, err := diagnoser.DiagnoseClusterDumps(archivePath, diagTempDir)
+		if err != nil {
+			return fmt.Errorf("diagnosis failed: %w", err)
+		}
+		
+		// Check for any invalid dumps
+		var invalidDumps []string
+		for _, result := range results {
+			if !result.IsValid {
+				invalidDumps = append(invalidDumps, result.FileName)
+				diagnoser.PrintDiagnosis(result)
+			}
+		}
+		
+		if len(invalidDumps) > 0 {
+			log.Error("❌ Pre-restore diagnosis found issues",
+				"invalid_dumps", len(invalidDumps),
+				"total_dumps", len(results))
+			fmt.Println("\n⚠️  The following dumps have issues and will likely fail during restore:")
+			for _, name := range invalidDumps {
+				fmt.Printf("    - %s\n", name)
+			}
+			fmt.Println("\nRun 'dbbackup restore diagnose <archive> --deep' for full details.")
+			fmt.Println("Use --force to attempt restore anyway.")
+			
+			if !restoreForce {
+				return fmt.Errorf("aborting restore due to %d invalid dump(s)", len(invalidDumps))
+			}
+			log.Warn("Continuing despite diagnosis errors (--force enabled)")
+		} else {
+			log.Info("✅ All dumps passed diagnosis", "count", len(results))
+		}
+	}
+
 	// Execute cluster restore
 	log.Info("Starting cluster restore...")
 

internal/config/config.go

@@ -64,6 +64,9 @@ type Config struct {
 	// Cluster parallelism
 	ClusterParallelism int // Number of concurrent databases during cluster operations (0 = sequential)
 
+	// Working directory for large operations (extraction, diagnosis)
+	WorkDir string // Alternative temp directory for large operations (default: system temp)
+
 	// Swap file management (for large backups)
 	SwapFilePath   string // Path to temporary swap file
 	SwapFileSizeGB int    // Size in GB (0 = disabled)

internal/config/persist.go

@@ -22,6 +22,7 @@ type LocalConfig struct {
 
 	// Backup settings
 	BackupDir   string
+	WorkDir     string // Working directory for large operations
 	Compression int
 	Jobs        int
 	DumpJobs    int
@@ -97,6 +98,8 @@ func LoadLocalConfig() (*LocalConfig, error) {
 			switch key {
 			case "backup_dir":
 				cfg.BackupDir = value
+			case "work_dir":
+				cfg.WorkDir = value
 			case "compression":
 				if c, err := strconv.Atoi(value); err == nil {
 					cfg.Compression = c
@@ -174,6 +177,9 @@ func SaveLocalConfig(cfg *LocalConfig) error {
 	if cfg.BackupDir != "" {
 		sb.WriteString(fmt.Sprintf("backup_dir = %s\n", cfg.BackupDir))
 	}
+	if cfg.WorkDir != "" {
+		sb.WriteString(fmt.Sprintf("work_dir = %s\n", cfg.WorkDir))
+	}
 	if cfg.Compression != 0 {
 		sb.WriteString(fmt.Sprintf("compression = %d\n", cfg.Compression))
 	}
@@ -244,6 +250,9 @@ func ApplyLocalConfig(cfg *Config, local *LocalConfig) {
 	if local.BackupDir != "" {
 		cfg.BackupDir = local.BackupDir
 	}
+	if local.WorkDir != "" {
+		cfg.WorkDir = local.WorkDir
+	}
 	if cfg.CompressionLevel == 6 && local.Compression != 0 {
 		cfg.CompressionLevel = local.Compression
 	}
@@ -280,6 +289,7 @@ func ConfigFromConfig(cfg *Config) *LocalConfig {
 		Database:      cfg.Database,
 		SSLMode:       cfg.SSLMode,
 		BackupDir:     cfg.BackupDir,
+		WorkDir:       cfg.WorkDir,
 		Compression:   cfg.CompressionLevel,
 		Jobs:          cfg.Jobs,
 		DumpJobs:      cfg.DumpJobs,

internal/engine/clone.go

@@ -339,7 +339,7 @@ func (e *CloneEngine) Backup(ctx context.Context, opts *BackupOptions) (*BackupR
 
 	// Save metadata
 	meta := &metadata.BackupMetadata{
-		Version:      "3.1.0",
+		Version:      "3.40.0",
 		Timestamp:    startTime,
 		Database:     opts.Database,
 		DatabaseType: "mysql",

internal/engine/mysqldump.go

@@ -254,7 +254,7 @@ func (e *MySQLDumpEngine) Backup(ctx context.Context, opts *BackupOptions) (*Bac
 
 	// Save metadata
 	meta := &metadata.BackupMetadata{
-		Version:      "3.1.0",
+		Version:      "3.40.0",
 		Timestamp:    startTime,
 		Database:     opts.Database,
 		DatabaseType: "mysql",

internal/engine/snapshot_engine.go

@@ -223,7 +223,7 @@ func (e *SnapshotEngine) Backup(ctx context.Context, opts *BackupOptions) (*Back
 
 	// Save metadata
 	meta := &metadata.BackupMetadata{
-		Version:      "3.1.0",
+		Version:      "3.40.0",
 		Timestamp:    startTime,
 		Database:     opts.Database,
 		DatabaseType: "mysql",

internal/restore/diagnose.go

@@ -0,0 +1,829 @@
+package restore
+
+import (
+	"bufio"
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"dbbackup/internal/logger"
+)
+
+// DiagnoseResult contains the results of a dump file diagnosis
+type DiagnoseResult struct {
+	FilePath       string           `json:"file_path"`
+	FileName       string           `json:"file_name"`
+	FileSize       int64            `json:"file_size"`
+	Format         ArchiveFormat    `json:"format"`
+	DetectedFormat string           `json:"detected_format"`
+	IsValid        bool             `json:"is_valid"`
+	IsTruncated    bool             `json:"is_truncated"`
+	IsCorrupted    bool             `json:"is_corrupted"`
+	Errors         []string         `json:"errors,omitempty"`
+	Warnings       []string         `json:"warnings,omitempty"`
+	Details        *DiagnoseDetails `json:"details,omitempty"`
+}
+
+// DiagnoseDetails contains detailed analysis of the dump file
+type DiagnoseDetails struct {
+	// Header info
+	HasPGDMPSignature bool   `json:"has_pgdmp_signature,omitempty"`
+	HasSQLHeader      bool   `json:"has_sql_header,omitempty"`
+	FirstBytes        string `json:"first_bytes,omitempty"`
+	LastBytes         string `json:"last_bytes,omitempty"`
+
+	// COPY block analysis (for SQL dumps)
+	CopyBlockCount     int      `json:"copy_block_count,omitempty"`
+	UnterminatedCopy   bool     `json:"unterminated_copy,omitempty"`
+	LastCopyTable      string   `json:"last_copy_table,omitempty"`
+	LastCopyLineNumber int      `json:"last_copy_line_number,omitempty"`
+	SampleCopyData     []string `json:"sample_copy_data,omitempty"`
+
+	// Structure analysis
+	HasCreateStatements bool `json:"has_create_statements,omitempty"`
+	HasInsertStatements bool `json:"has_insert_statements,omitempty"`
+	HasCopyStatements   bool `json:"has_copy_statements,omitempty"`
+	HasTransactionBlock bool `json:"has_transaction_block,omitempty"`
+	ProperlyTerminated  bool `json:"properly_terminated,omitempty"`
+
+	// pg_restore analysis (for custom format)
+	PgRestoreListable bool     `json:"pg_restore_listable,omitempty"`
+	PgRestoreError    string   `json:"pg_restore_error,omitempty"`
+	TableCount        int      `json:"table_count,omitempty"`
+	TableList         []string `json:"table_list,omitempty"`
+
+	// Compression analysis
+	GzipValid     bool   `json:"gzip_valid,omitempty"`
+	GzipError     string `json:"gzip_error,omitempty"`
+	ExpandedSize  int64  `json:"expanded_size,omitempty"`
+	CompressionRatio float64 `json:"compression_ratio,omitempty"`
+}
+
+// Diagnoser performs deep analysis of backup files
+type Diagnoser struct {
+	log     logger.Logger
+	verbose bool
+}
+
+// NewDiagnoser creates a new diagnoser
+func NewDiagnoser(log logger.Logger, verbose bool) *Diagnoser {
+	return &Diagnoser{
+		log:     log,
+		verbose: verbose,
+	}
+}
+
+// DiagnoseFile performs comprehensive diagnosis of a backup file
+func (d *Diagnoser) DiagnoseFile(filePath string) (*DiagnoseResult, error) {
+	result := &DiagnoseResult{
+		FilePath: filePath,
+		FileName: filepath.Base(filePath),
+		Details:  &DiagnoseDetails{},
+		IsValid:  true, // Assume valid until proven otherwise
+	}
+
+	// Check file exists and get size
+	stat, err := os.Stat(filePath)
+	if err != nil {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot access file: %v", err))
+		return result, nil
+	}
+	result.FileSize = stat.Size()
+
+	if result.FileSize == 0 {
+		result.IsValid = false
+		result.IsTruncated = true
+		result.Errors = append(result.Errors, "File is empty (0 bytes)")
+		return result, nil
+	}
+
+	// Detect format
+	result.Format = DetectArchiveFormat(filePath)
+	result.DetectedFormat = result.Format.String()
+
+	// Analyze based on format
+	switch result.Format {
+	case FormatPostgreSQLDump:
+		d.diagnosePgDump(filePath, result)
+	case FormatPostgreSQLDumpGz:
+		d.diagnosePgDumpGz(filePath, result)
+	case FormatPostgreSQLSQL:
+		d.diagnoseSQLScript(filePath, false, result)
+	case FormatPostgreSQLSQLGz:
+		d.diagnoseSQLScript(filePath, true, result)
+	case FormatClusterTarGz:
+		d.diagnoseClusterArchive(filePath, result)
+	default:
+		result.Warnings = append(result.Warnings, "Unknown format - limited diagnosis available")
+		d.diagnoseUnknown(filePath, result)
+	}
+
+	return result, nil
+}
+
+// diagnosePgDump analyzes PostgreSQL custom format dump
+func (d *Diagnoser) diagnosePgDump(filePath string, result *DiagnoseResult) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
+		return
+	}
+	defer file.Close()
+
+	// Read first 512 bytes
+	header := make([]byte, 512)
+	n, err := file.Read(header)
+	if err != nil && err != io.EOF {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot read header: %v", err))
+		return
+	}
+
+	// Check PGDMP signature
+	if n >= 5 && string(header[:5]) == "PGDMP" {
+		result.Details.HasPGDMPSignature = true
+		result.Details.FirstBytes = "PGDMP..."
+	} else {
+		result.IsValid = false
+		result.IsCorrupted = true
+		result.Details.HasPGDMPSignature = false
+		result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 20)])
+		result.Errors = append(result.Errors, 
+			"Missing PGDMP signature - file is NOT PostgreSQL custom format",
+			"This file may be SQL format incorrectly named as .dump",
+			"Try: file "+filePath+" to check actual file type")
+		return
+	}
+
+	// Try pg_restore --list to verify dump integrity
+	d.verifyWithPgRestore(filePath, result)
+}
+
+// diagnosePgDumpGz analyzes compressed PostgreSQL custom format dump
+func (d *Diagnoser) diagnosePgDumpGz(filePath string, result *DiagnoseResult) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
+		return
+	}
+	defer file.Close()
+
+	// Verify gzip integrity
+	gz, err := gzip.NewReader(file)
+	if err != nil {
+		result.IsValid = false
+		result.IsCorrupted = true
+		result.Details.GzipValid = false
+		result.Details.GzipError = err.Error()
+		result.Errors = append(result.Errors, 
+			fmt.Sprintf("Invalid gzip format: %v", err),
+			"The file may be truncated or corrupted during transfer")
+		return
+	}
+	result.Details.GzipValid = true
+
+	// Read and check header
+	header := make([]byte, 512)
+	n, err := gz.Read(header)
+	if err != nil && err != io.EOF {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot read decompressed header: %v", err))
+		gz.Close()
+		return
+	}
+	gz.Close()
+
+	// Check PGDMP signature
+	if n >= 5 && string(header[:5]) == "PGDMP" {
+		result.Details.HasPGDMPSignature = true
+		result.Details.FirstBytes = "PGDMP..."
+	} else {
+		result.Details.HasPGDMPSignature = false
+		result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 20)])
+		
+		// Check if it's actually SQL content
+		content := string(header[:n])
+		if strings.Contains(content, "PostgreSQL") || strings.Contains(content, "pg_dump") ||
+			strings.Contains(content, "SET ") || strings.Contains(content, "CREATE ") {
+			result.Details.HasSQLHeader = true
+			result.Warnings = append(result.Warnings,
+				"File contains SQL text but has .dump extension",
+				"This appears to be SQL format, not custom format",
+				"Restore should use psql, not pg_restore")
+		} else {
+			result.IsValid = false
+			result.IsCorrupted = true
+			result.Errors = append(result.Errors,
+				"Missing PGDMP signature in decompressed content",
+				"File is neither custom format nor valid SQL")
+		}
+		return
+	}
+
+	// Verify full gzip stream integrity by reading to end
+	file.Seek(0, 0)
+	gz, _ = gzip.NewReader(file)
+	
+	var totalRead int64
+	buf := make([]byte, 32*1024)
+	for {
+		n, err := gz.Read(buf)
+		totalRead += int64(n)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			result.IsValid = false
+			result.IsTruncated = true
+			result.Details.ExpandedSize = totalRead
+			result.Errors = append(result.Errors,
+				fmt.Sprintf("Gzip stream truncated after %d bytes: %v", totalRead, err),
+				"The backup file appears to be incomplete",
+				"Check if backup process completed successfully")
+			gz.Close()
+			return
+		}
+	}
+	gz.Close()
+	
+	result.Details.ExpandedSize = totalRead
+	if result.FileSize > 0 {
+		result.Details.CompressionRatio = float64(totalRead) / float64(result.FileSize)
+	}
+}
+
+// diagnoseSQLScript analyzes SQL script format
+func (d *Diagnoser) diagnoseSQLScript(filePath string, compressed bool, result *DiagnoseResult) {
+	var reader io.Reader
+	var file *os.File
+	var gz *gzip.Reader
+	var err error
+
+	file, err = os.Open(filePath)
+	if err != nil {
+		result.IsValid = false
+		result.Errors = append(result.Errors, fmt.Sprintf("Cannot open file: %v", err))
+		return
+	}
+	defer file.Close()
+
+	if compressed {
+		gz, err = gzip.NewReader(file)
+		if err != nil {
+			result.IsValid = false
+			result.IsCorrupted = true
+			result.Details.GzipValid = false
+			result.Details.GzipError = err.Error()
+			result.Errors = append(result.Errors, fmt.Sprintf("Invalid gzip format: %v", err))
+			return
+		}
+		result.Details.GzipValid = true
+		reader = gz
+		defer gz.Close()
+	} else {
+		reader = file
+	}
+
+	// Analyze SQL content
+	scanner := bufio.NewScanner(reader)
+	// Increase buffer size for large lines (COPY data can have long lines)
+	buf := make([]byte, 0, 1024*1024)
+	scanner.Buffer(buf, 10*1024*1024)
+
+	var lineNumber int
+	var inCopyBlock bool
+	var lastCopyTable string
+	var copyStartLine int
+	var copyDataSamples []string
+
+	copyBlockPattern := regexp.MustCompile(`^COPY\s+("?[\w\."]+)"?\s+\(`)
+	copyEndPattern := regexp.MustCompile(`^\\\.`)
+
+	for scanner.Scan() {
+		lineNumber++
+		line := scanner.Text()
+
+		// Check first few lines for header
+		if lineNumber <= 10 {
+			if strings.Contains(line, "PostgreSQL") || strings.Contains(line, "pg_dump") {
+				result.Details.HasSQLHeader = true
+			}
+		}
+
+		// Track structure
+		upperLine := strings.ToUpper(strings.TrimSpace(line))
+		if strings.HasPrefix(upperLine, "CREATE ") {
+			result.Details.HasCreateStatements = true
+		}
+		if strings.HasPrefix(upperLine, "INSERT ") {
+			result.Details.HasInsertStatements = true
+		}
+		if strings.HasPrefix(upperLine, "BEGIN") {
+			result.Details.HasTransactionBlock = true
+		}
+
+		// Track COPY blocks
+		if copyBlockPattern.MatchString(line) {
+			if inCopyBlock {
+				// Previous COPY block wasn't terminated!
+				result.Details.UnterminatedCopy = true
+				result.IsTruncated = true
+				result.IsValid = false
+				result.Errors = append(result.Errors,
+					fmt.Sprintf("COPY block for '%s' starting at line %d was never terminated",
+						lastCopyTable, copyStartLine))
+			}
+
+			inCopyBlock = true
+			result.Details.HasCopyStatements = true
+			result.Details.CopyBlockCount++
+
+			matches := copyBlockPattern.FindStringSubmatch(line)
+			if len(matches) > 1 {
+				lastCopyTable = matches[1]
+			}
+			copyStartLine = lineNumber
+			copyDataSamples = nil
+
+		} else if copyEndPattern.MatchString(line) {
+			inCopyBlock = false
+
+		} else if inCopyBlock {
+			// We're in COPY data
+			if len(copyDataSamples) < 3 {
+				copyDataSamples = append(copyDataSamples, truncateString(line, 100))
+			}
+		}
+
+		// Store last line for termination check
+		if lineNumber > 0 && (lineNumber%100000 == 0) && d.verbose {
+			d.log.Debug("Scanning SQL file", "lines_processed", lineNumber)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		result.IsValid = false
+		result.IsTruncated = true
+		result.Errors = append(result.Errors,
+			fmt.Sprintf("Error reading file at line %d: %v", lineNumber, err),
+			"File may be truncated or contain invalid data")
+	}
+
+	// Check if we ended while still in a COPY block
+	if inCopyBlock {
+		result.Details.UnterminatedCopy = true
+		result.Details.LastCopyTable = lastCopyTable
+		result.Details.LastCopyLineNumber = copyStartLine
+		result.Details.SampleCopyData = copyDataSamples
+		result.IsTruncated = true
+		result.IsValid = false
+		result.Errors = append(result.Errors,
+			fmt.Sprintf("File ends inside COPY block for table '%s' (started at line %d)",
+				lastCopyTable, copyStartLine),
+			"The backup was truncated during data export",
+			"This explains the 'syntax error' during restore - COPY data is being interpreted as SQL")
+		
+		if len(copyDataSamples) > 0 {
+			result.Errors = append(result.Errors,
+				fmt.Sprintf("Sample orphaned data: %s", copyDataSamples[0]))
+		}
+	} else {
+		result.Details.ProperlyTerminated = true
+	}
+
+	// Read last bytes for additional context
+	if !compressed {
+		file.Seek(-min(500, result.FileSize), 2)
+		lastBytes := make([]byte, 500)
+		n, _ := file.Read(lastBytes)
+		result.Details.LastBytes = strings.TrimSpace(string(lastBytes[:n]))
+	}
+}
+
+// diagnoseClusterArchive analyzes a cluster tar.gz archive
+func (d *Diagnoser) diagnoseClusterArchive(filePath string, result *DiagnoseResult) {
+	// First verify tar.gz integrity
+	cmd := exec.Command("tar", "-tzf", filePath)
+	output, err := cmd.Output()
+	if err != nil {
+		result.IsValid = false
+		result.IsCorrupted = true
+		result.Errors = append(result.Errors,
+			fmt.Sprintf("Tar archive is invalid or corrupted: %v", err),
+			"Run: tar -tzf "+filePath+" 2>&1 | tail -20")
+		return
+	}
+
+	// Parse tar listing
+	files := strings.Split(strings.TrimSpace(string(output)), "\n")
+	var dumpFiles []string
+	hasGlobals := false
+	hasMetadata := false
+
+	for _, f := range files {
+		if strings.HasSuffix(f, ".dump") || strings.HasSuffix(f, ".sql.gz") {
+			dumpFiles = append(dumpFiles, f)
+		}
+		if strings.Contains(f, "globals.sql") {
+			hasGlobals = true
+		}
+		if strings.Contains(f, "manifest.json") || strings.Contains(f, "metadata.json") {
+			hasMetadata = true
+		}
+	}
+
+	result.Details.TableCount = len(dumpFiles)
+	result.Details.TableList = dumpFiles
+
+	if len(dumpFiles) == 0 {
+		result.Warnings = append(result.Warnings, "No database dump files found in archive")
+	}
+
+	if !hasGlobals {
+		result.Warnings = append(result.Warnings, "No globals.sql found - roles/tablespaces won't be restored")
+	}
+
+	if !hasMetadata {
+		result.Warnings = append(result.Warnings, "No manifest/metadata found - limited validation possible")
+	}
+
+	// For verbose mode, diagnose individual dumps inside the archive
+	if d.verbose && len(dumpFiles) > 0 {
+		d.log.Info("Cluster archive contains databases", "count", len(dumpFiles))
+		for _, df := range dumpFiles {
+			d.log.Info("  - " + df)
+		}
+	}
+}
+
+// diagnoseUnknown handles unknown format files
+func (d *Diagnoser) diagnoseUnknown(filePath string, result *DiagnoseResult) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	header := make([]byte, 512)
+	n, _ := file.Read(header)
+	result.Details.FirstBytes = fmt.Sprintf("%q", header[:minInt(n, 50)])
+
+	// Try to identify by content
+	content := string(header[:n])
+	if strings.Contains(content, "PGDMP") {
+		result.Warnings = append(result.Warnings, "File appears to be PostgreSQL custom format - rename to .dump")
+	} else if strings.Contains(content, "PostgreSQL") || strings.Contains(content, "pg_dump") {
+		result.Warnings = append(result.Warnings, "File appears to be PostgreSQL SQL - rename to .sql")
+	} else if bytes.HasPrefix(header, []byte{0x1f, 0x8b}) {
+		result.Warnings = append(result.Warnings, "File appears to be gzip compressed - add .gz extension")
+	}
+}
+
+// verifyWithPgRestore uses pg_restore --list to verify dump integrity
+func (d *Diagnoser) verifyWithPgRestore(filePath string, result *DiagnoseResult) {
+	cmd := exec.Command("pg_restore", "--list", filePath)
+	output, err := cmd.CombinedOutput()
+
+	if err != nil {
+		result.Details.PgRestoreListable = false
+		result.Details.PgRestoreError = string(output)
+		
+		// Check for specific errors
+		errStr := string(output)
+		if strings.Contains(errStr, "unexpected end of file") ||
+			strings.Contains(errStr, "invalid large-object TOC entry") {
+			result.IsTruncated = true
+			result.IsValid = false
+			result.Errors = append(result.Errors,
+				"pg_restore reports truncated or incomplete dump file",
+				fmt.Sprintf("Error: %s", truncateString(errStr, 200)))
+		} else if strings.Contains(errStr, "not a valid archive") {
+			result.IsCorrupted = true
+			result.IsValid = false
+			result.Errors = append(result.Errors,
+				"pg_restore reports file is not a valid archive",
+				"File may be corrupted or wrong format")
+		} else {
+			result.Warnings = append(result.Warnings,
+				fmt.Sprintf("pg_restore --list warning: %s", truncateString(errStr, 200)))
+		}
+		return
+	}
+
+	result.Details.PgRestoreListable = true
+
+	// Count tables in the TOC
+	lines := strings.Split(string(output), "\n")
+	tableCount := 0
+	var tables []string
+	for _, line := range lines {
+		if strings.Contains(line, " TABLE DATA ") {
+			tableCount++
+			if len(tables) < 20 {
+				parts := strings.Fields(line)
+				if len(parts) > 3 {
+					tables = append(tables, parts[len(parts)-1])
+				}
+			}
+		}
+	}
+	result.Details.TableCount = tableCount
+	result.Details.TableList = tables
+}
+
+// DiagnoseClusterDumps extracts and diagnoses all dumps in a cluster archive
+func (d *Diagnoser) DiagnoseClusterDumps(archivePath, tempDir string) ([]*DiagnoseResult, error) {
+	// First, try to list archive contents without extracting (fast check)
+	listCmd := exec.Command("tar", "-tzf", archivePath)
+	listOutput, listErr := listCmd.CombinedOutput()
+	if listErr != nil {
+		// Archive listing failed - likely corrupted
+		errResult := &DiagnoseResult{
+			FilePath:       archivePath,
+			FileName:       filepath.Base(archivePath),
+			Format:         FormatClusterTarGz,
+			DetectedFormat: "Cluster Archive (tar.gz)",
+			IsValid:        false,
+			IsCorrupted:    true,
+			Details:        &DiagnoseDetails{},
+		}
+		
+		errOutput := string(listOutput)
+		if strings.Contains(errOutput, "unexpected end of file") || 
+			strings.Contains(errOutput, "Unexpected EOF") ||
+			strings.Contains(errOutput, "truncated") {
+			errResult.IsTruncated = true
+			errResult.Errors = append(errResult.Errors,
+				"Archive appears to be TRUNCATED - incomplete download or backup",
+				fmt.Sprintf("tar error: %s", truncateString(errOutput, 300)),
+				"Possible causes: disk full during backup, interrupted transfer, network timeout",
+				"Solution: Re-create the backup from source database")
+		} else {
+			errResult.Errors = append(errResult.Errors,
+				fmt.Sprintf("Cannot list archive contents: %v", listErr),
+				fmt.Sprintf("tar error: %s", truncateString(errOutput, 300)),
+				"Run manually: tar -tzf "+archivePath+" 2>&1 | tail -50")
+		}
+		
+		return []*DiagnoseResult{errResult}, nil
+	}
+
+	// Archive is listable - now check disk space before extraction
+	files := strings.Split(strings.TrimSpace(string(listOutput)), "\n")
+	
+	// Check if we have enough disk space (estimate 4x archive size needed)
+	archiveInfo, _ := os.Stat(archivePath)
+	requiredSpace := archiveInfo.Size() * 4
+	
+	// Check temp directory space - try to extract metadata first
+	if stat, err := os.Stat(tempDir); err == nil && stat.IsDir() {
+		// Try extraction of a small test file first
+		testCmd := exec.Command("tar", "-xzf", archivePath, "-C", tempDir, "--wildcards", "*.json", "--wildcards", "globals.sql")
+		testCmd.Run() // Ignore error - just try to extract metadata
+	}
+	
+	d.log.Info("Archive listing successful", "files", len(files))
+	
+	// Try full extraction
+	cmd := exec.Command("tar", "-xzf", archivePath, "-C", tempDir)
+	var stderr bytes.Buffer
+	cmd.Stderr = &stderr
+	if err := cmd.Run(); err != nil {
+		// Extraction failed
+		errResult := &DiagnoseResult{
+			FilePath:       archivePath,
+			FileName:       filepath.Base(archivePath),
+			Format:         FormatClusterTarGz,
+			DetectedFormat: "Cluster Archive (tar.gz)",
+			IsValid:        false,
+			Details:        &DiagnoseDetails{},
+		}
+		
+		errOutput := stderr.String()
+		if strings.Contains(errOutput, "No space left") || 
+			strings.Contains(errOutput, "cannot write") ||
+			strings.Contains(errOutput, "Disk quota exceeded") {
+			errResult.Errors = append(errResult.Errors,
+				"INSUFFICIENT DISK SPACE to extract archive for diagnosis",
+				fmt.Sprintf("Archive size: %s (needs ~%s for extraction)", 
+					formatBytes(archiveInfo.Size()), formatBytes(requiredSpace)),
+				"Use CLI diagnosis instead: dbbackup restore diagnose "+archivePath,
+				"Or use --workdir flag to specify a location with more space")
+		} else if strings.Contains(errOutput, "unexpected end of file") ||
+			strings.Contains(errOutput, "Unexpected EOF") {
+			errResult.IsTruncated = true
+			errResult.IsCorrupted = true
+			errResult.Errors = append(errResult.Errors,
+				"Archive is TRUNCATED - extraction failed mid-way",
+				fmt.Sprintf("Error: %s", truncateString(errOutput, 200)),
+				"The backup file is incomplete and cannot be restored",
+				"Solution: Re-create the backup from source database")
+		} else {
+			errResult.IsCorrupted = true
+			errResult.Errors = append(errResult.Errors,
+				fmt.Sprintf("Extraction failed: %v", err),
+				fmt.Sprintf("tar error: %s", truncateString(errOutput, 300)))
+		}
+		
+		// Still report what files we found in the listing
+		var dumpFiles []string
+		for _, f := range files {
+			if strings.HasSuffix(f, ".dump") || strings.HasSuffix(f, ".sql.gz") {
+				dumpFiles = append(dumpFiles, filepath.Base(f))
+			}
+		}
+		if len(dumpFiles) > 0 {
+			errResult.Details.TableList = dumpFiles
+			errResult.Details.TableCount = len(dumpFiles)
+			errResult.Warnings = append(errResult.Warnings,
+				fmt.Sprintf("Archive contains %d database dumps (listing only)", len(dumpFiles)))
+		}
+		
+		return []*DiagnoseResult{errResult}, nil
+	}
+
+	// Find dump files
+	dumpsDir := filepath.Join(tempDir, "dumps")
+	entries, err := os.ReadDir(dumpsDir)
+	if err != nil {
+		// Try without dumps subdirectory
+		entries, err = os.ReadDir(tempDir)
+		if err != nil {
+			return nil, fmt.Errorf("cannot read extracted files: %w", err)
+		}
+		dumpsDir = tempDir
+	}
+
+	var results []*DiagnoseResult
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+
+		name := entry.Name()
+		if !strings.HasSuffix(name, ".dump") && !strings.HasSuffix(name, ".sql.gz") &&
+			!strings.HasSuffix(name, ".sql") {
+			continue
+		}
+
+		dumpPath := filepath.Join(dumpsDir, name)
+		d.log.Info("Diagnosing dump file", "file", name)
+
+		result, err := d.DiagnoseFile(dumpPath)
+		if err != nil {
+			d.log.Warn("Failed to diagnose file", "file", name, "error", err)
+			continue
+		}
+		results = append(results, result)
+	}
+
+	return results, nil
+}
+
+// PrintDiagnosis outputs a human-readable diagnosis report
+func (d *Diagnoser) PrintDiagnosis(result *DiagnoseResult) {
+	fmt.Println("\n" + strings.Repeat("=", 70))
+	fmt.Printf("📋 DIAGNOSIS: %s\n", result.FileName)
+	fmt.Println(strings.Repeat("=", 70))
+
+	// Basic info
+	fmt.Printf("\nFile: %s\n", result.FilePath)
+	fmt.Printf("Size: %s\n", formatBytes(result.FileSize))
+	fmt.Printf("Format: %s\n", result.DetectedFormat)
+
+	// Status
+	if result.IsValid {
+		fmt.Println("\n✅ STATUS: VALID")
+	} else {
+		fmt.Println("\n❌ STATUS: INVALID")
+	}
+
+	if result.IsTruncated {
+		fmt.Println("⚠️  TRUNCATED: Yes - file appears incomplete")
+	}
+	if result.IsCorrupted {
+		fmt.Println("⚠️  CORRUPTED: Yes - file structure is damaged")
+	}
+
+	// Details
+	if result.Details != nil {
+		fmt.Println("\n📊 DETAILS:")
+
+		if result.Details.HasPGDMPSignature {
+			fmt.Println("  ✓ Has PGDMP signature (PostgreSQL custom format)")
+		}
+		if result.Details.HasSQLHeader {
+			fmt.Println("  ✓ Has PostgreSQL SQL header")
+		}
+		if result.Details.GzipValid {
+			fmt.Println("  ✓ Gzip compression valid")
+		}
+		if result.Details.PgRestoreListable {
+			fmt.Printf("  ✓ pg_restore can list contents (%d tables)\n", result.Details.TableCount)
+		}
+		if result.Details.CopyBlockCount > 0 {
+			fmt.Printf("  • Contains %d COPY blocks\n", result.Details.CopyBlockCount)
+		}
+		if result.Details.UnterminatedCopy {
+			fmt.Printf("  ✗ Unterminated COPY block: %s (line %d)\n",
+				result.Details.LastCopyTable, result.Details.LastCopyLineNumber)
+		}
+		if result.Details.ProperlyTerminated {
+			fmt.Println("  ✓ All COPY blocks properly terminated")
+		}
+		if result.Details.ExpandedSize > 0 {
+			fmt.Printf("  • Expanded size: %s (ratio: %.1fx)\n",
+				formatBytes(result.Details.ExpandedSize), result.Details.CompressionRatio)
+		}
+	}
+
+	// Errors
+	if len(result.Errors) > 0 {
+		fmt.Println("\n❌ ERRORS:")
+		for _, e := range result.Errors {
+			fmt.Printf("  • %s\n", e)
+		}
+	}
+
+	// Warnings
+	if len(result.Warnings) > 0 {
+		fmt.Println("\n⚠️  WARNINGS:")
+		for _, w := range result.Warnings {
+			fmt.Printf("  • %s\n", w)
+		}
+	}
+
+	// Recommendations
+	if !result.IsValid {
+		fmt.Println("\n💡 RECOMMENDATIONS:")
+		if result.IsTruncated {
+			fmt.Println("  1. Re-run the backup process for this database")
+			fmt.Println("  2. Check disk space on backup server during backup")
+			fmt.Println("  3. Verify network stability if backup was remote")
+			fmt.Println("  4. Check backup logs for errors during the backup")
+		}
+		if result.IsCorrupted {
+			fmt.Println("  1. Verify backup file was transferred completely")
+			fmt.Println("  2. Check if backup file was modified after creation")
+			fmt.Println("  3. Try restoring from a previous backup")
+		}
+	}
+
+	fmt.Println(strings.Repeat("=", 70))
+}
+
+// PrintDiagnosisJSON outputs diagnosis as JSON
+func (d *Diagnoser) PrintDiagnosisJSON(result *DiagnoseResult) error {
+	output, err := json.MarshalIndent(result, "", "  ")
+	if err != nil {
+		return err
+	}
+	fmt.Println(string(output))
+	return nil
+}
+
+// Helper functions
+
+func truncateString(s string, maxLen int) string {
+	if len(s) <= maxLen {
+		return s
+	}
+	return s[:maxLen-3] + "..."
+}
+
+func formatBytes(bytes int64) string {
+	const unit = 1024
+	if bytes < unit {
+		return fmt.Sprintf("%d B", bytes)
+	}
+	div, exp := int64(unit), 0
+	for n := bytes / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf("%.1f %cB", float64(bytes)/float64(div), "KMGTPE"[exp])
+}
+
+func min(a, b int64) int64 {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func minInt(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

internal/restore/engine.go

@@ -27,6 +27,8 @@ type Engine struct {
 	progress         progress.Indicator
 	detailedReporter *progress.DetailedReporter
 	dryRun           bool
+	debugLogPath     string         // Path to save debug log on error
+	errorCollector   *ErrorCollector // Collects detailed error info
 }
 
 // New creates a new restore engine
@@ -77,6 +79,11 @@ func NewWithProgress(cfg *config.Config, log logger.Logger, db database.Database
 	}
 }
 
+// SetDebugLogPath enables saving detailed error reports on failure
+func (e *Engine) SetDebugLogPath(path string) {
+	e.debugLogPath = path
+}
+
 // loggerAdapter adapts our logger to the progress.Logger interface
 type loggerAdapter struct {
 	logger logger.Logger
@@ -306,6 +313,11 @@ func (e *Engine) restoreMySQLSQL(ctx context.Context, archivePath, targetDB stri
 
 // executeRestoreCommand executes a restore command
 func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) error {
+	return e.executeRestoreCommandWithContext(ctx, cmdArgs, "", "", FormatUnknown)
+}
+
+// executeRestoreCommandWithContext executes a restore command with error collection context
+func (e *Engine) executeRestoreCommandWithContext(ctx context.Context, cmdArgs []string, archivePath, targetDB string, format ArchiveFormat) error {
 	e.log.Info("Executing restore command", "command", strings.Join(cmdArgs, " "))
 
 	cmd := exec.CommandContext(ctx, cmdArgs[0], cmdArgs[1:]...)
@@ -316,6 +328,12 @@ func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) er
 		fmt.Sprintf("MYSQL_PWD=%s", e.cfg.Password),
 	)
 
+	// Create error collector if debug log path is set
+	var collector *ErrorCollector
+	if e.debugLogPath != "" {
+		collector = NewErrorCollector(e.cfg, e.log, archivePath, targetDB, format, true)
+	}
+
 	// Stream stderr to avoid memory issues with large output
 	// Don't use CombinedOutput() as it loads everything into memory
 	stderr, err := cmd.StderrPipe()
@@ -336,6 +354,12 @@ func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) er
 		n, err := stderr.Read(buf)
 		if n > 0 {
 			chunk := string(buf[:n])
+			
+			// Feed to error collector if enabled
+			if collector != nil {
+				collector.CaptureStderr(chunk)
+			}
+			
 			// Only capture REAL errors, not verbose output
 			if strings.Contains(chunk, "ERROR:") || strings.Contains(chunk, "FATAL:") || strings.Contains(chunk, "error:") {
 				lastError = strings.TrimSpace(chunk)
@@ -352,6 +376,12 @@ func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) er
 	}
 
 	if err := cmd.Wait(); err != nil {
+		// Get exit code
+		exitCode := 1
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			exitCode = exitErr.ExitCode()
+		}
+		
 		// PostgreSQL pg_restore returns exit code 1 even for ignorable errors
 		// Check if errors are ignorable (already exists, duplicate, etc.)
 		if lastError != "" && e.isIgnorableError(lastError) {
@@ -360,8 +390,12 @@ func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) er
 		}
 
 		// Classify error and provide helpful hints
+		var classification *checks.ErrorClassification
+		var errType, errHint string
 		if lastError != "" {
-			classification := checks.ClassifyError(lastError)
+			classification = checks.ClassifyError(lastError)
+			errType = classification.Type
+			errHint = classification.Hint
 			e.log.Error("Restore command failed",
 				"error", err,
 				"last_stderr", lastError,
@@ -369,11 +403,37 @@ func (e *Engine) executeRestoreCommand(ctx context.Context, cmdArgs []string) er
 				"error_type", classification.Type,
 				"hint", classification.Hint,
 				"action", classification.Action)
-			return fmt.Errorf("restore failed: %w (last error: %s, total errors: %d) - %s",
-				err, lastError, errorCount, classification.Hint)
+		} else {
+			e.log.Error("Restore command failed", "error", err, "error_count", errorCount)
 		}
 
-		e.log.Error("Restore command failed", "error", err, "last_stderr", lastError, "error_count", errorCount)
+		// Generate and save error report if collector is enabled
+		if collector != nil {
+			collector.SetExitCode(exitCode)
+			report := collector.GenerateReport(
+				lastError,
+				errType,
+				errHint,
+			)
+			
+			// Print report to console
+			collector.PrintReport(report)
+			
+			// Save to file
+			if e.debugLogPath != "" {
+				if saveErr := collector.SaveReport(report, e.debugLogPath); saveErr != nil {
+					e.log.Warn("Failed to save debug log", "error", saveErr)
+				} else {
+					e.log.Info("Debug log saved", "path", e.debugLogPath)
+					fmt.Printf("\n📋 Detailed error report saved to: %s\n", e.debugLogPath)
+				}
+			}
+		}
+
+		if lastError != "" {
+			return fmt.Errorf("restore failed: %w (last error: %s, total errors: %d) - %s",
+				err, lastError, errorCount, errHint)
+		}
 		return fmt.Errorf("restore failed: %w", err)
 	}
 

internal/restore/error_report.go

@@ -0,0 +1,569 @@
+package restore
+
+import (
+	"bufio"
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
+
+	"dbbackup/internal/config"
+	"dbbackup/internal/logger"
+)
+
+// RestoreErrorReport contains comprehensive information about a restore failure
+type RestoreErrorReport struct {
+	// Metadata
+	Timestamp     time.Time `json:"timestamp"`
+	Version       string    `json:"version"`
+	GoVersion     string    `json:"go_version"`
+	OS            string    `json:"os"`
+	Arch          string    `json:"arch"`
+	
+	// Archive info
+	ArchivePath   string `json:"archive_path"`
+	ArchiveSize   int64  `json:"archive_size"`
+	ArchiveFormat string `json:"archive_format"`
+	
+	// Database info
+	TargetDB      string `json:"target_db"`
+	DatabaseType  string `json:"database_type"`
+	
+	// Error details
+	ExitCode      int      `json:"exit_code"`
+	ErrorMessage  string   `json:"error_message"`
+	ErrorType     string   `json:"error_type"`
+	ErrorHint     string   `json:"error_hint"`
+	TotalErrors   int      `json:"total_errors"`
+	
+	// Captured output
+	LastStderr    []string `json:"last_stderr"`
+	FirstErrors   []string `json:"first_errors"`
+	
+	// Context around failure
+	FailureContext *FailureContext `json:"failure_context,omitempty"`
+	
+	// Diagnosis results
+	DiagnosisResult *DiagnoseResult `json:"diagnosis_result,omitempty"`
+	
+	// Environment (sanitized)
+	PostgresVersion string `json:"postgres_version,omitempty"`
+	PgRestoreVersion string `json:"pg_restore_version,omitempty"`
+	PsqlVersion     string `json:"psql_version,omitempty"`
+	
+	// Recommendations
+	Recommendations []string `json:"recommendations"`
+}
+
+// FailureContext captures context around where the failure occurred
+type FailureContext struct {
+	// For SQL/COPY errors
+	FailedLine       int      `json:"failed_line,omitempty"`
+	FailedStatement  string   `json:"failed_statement,omitempty"`
+	SurroundingLines []string `json:"surrounding_lines,omitempty"`
+	
+	// For COPY block errors
+	InCopyBlock      bool   `json:"in_copy_block,omitempty"`
+	CopyTableName    string `json:"copy_table_name,omitempty"`
+	CopyStartLine    int    `json:"copy_start_line,omitempty"`
+	SampleCopyData   []string `json:"sample_copy_data,omitempty"`
+	
+	// File position info
+	BytePosition     int64 `json:"byte_position,omitempty"`
+	PercentComplete  float64 `json:"percent_complete,omitempty"`
+}
+
+// ErrorCollector captures detailed error information during restore
+type ErrorCollector struct {
+	log            logger.Logger
+	cfg            *config.Config
+	archivePath    string
+	targetDB       string
+	format         ArchiveFormat
+	
+	// Captured data
+	stderrLines    []string
+	firstErrors    []string
+	lastErrors     []string
+	totalErrors    int
+	exitCode       int
+	
+	// Limits
+	maxStderrLines  int
+	maxErrorCapture int
+	
+	// State
+	startTime      time.Time
+	enabled        bool
+}
+
+// NewErrorCollector creates a new error collector
+func NewErrorCollector(cfg *config.Config, log logger.Logger, archivePath, targetDB string, format ArchiveFormat, enabled bool) *ErrorCollector {
+	return &ErrorCollector{
+		log:             log,
+		cfg:             cfg,
+		archivePath:     archivePath,
+		targetDB:        targetDB,
+		format:          format,
+		stderrLines:     make([]string, 0, 100),
+		firstErrors:     make([]string, 0, 10),
+		lastErrors:      make([]string, 0, 10),
+		maxStderrLines:  100,
+		maxErrorCapture: 10,
+		startTime:       time.Now(),
+		enabled:         enabled,
+	}
+}
+
+// CaptureStderr processes and captures stderr output
+func (ec *ErrorCollector) CaptureStderr(chunk string) {
+	if !ec.enabled {
+		return
+	}
+	
+	lines := strings.Split(chunk, "\n")
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		
+		// Store last N lines of stderr
+		if len(ec.stderrLines) >= ec.maxStderrLines {
+			// Shift array, drop oldest
+			ec.stderrLines = ec.stderrLines[1:]
+		}
+		ec.stderrLines = append(ec.stderrLines, line)
+		
+		// Check if this is an error line
+		if isErrorLine(line) {
+			ec.totalErrors++
+			
+			// Capture first N errors
+			if len(ec.firstErrors) < ec.maxErrorCapture {
+				ec.firstErrors = append(ec.firstErrors, line)
+			}
+			
+			// Keep last N errors (ring buffer style)
+			if len(ec.lastErrors) >= ec.maxErrorCapture {
+				ec.lastErrors = ec.lastErrors[1:]
+			}
+			ec.lastErrors = append(ec.lastErrors, line)
+		}
+	}
+}
+
+// SetExitCode records the exit code
+func (ec *ErrorCollector) SetExitCode(code int) {
+	ec.exitCode = code
+}
+
+// GenerateReport creates a comprehensive error report
+func (ec *ErrorCollector) GenerateReport(errMessage string, errType string, errHint string) *RestoreErrorReport {
+	report := &RestoreErrorReport{
+		Timestamp:     time.Now(),
+		Version:       "1.0.0", // TODO: inject actual version
+		GoVersion:     runtime.Version(),
+		OS:            runtime.GOOS,
+		Arch:          runtime.GOARCH,
+		ArchivePath:   ec.archivePath,
+		ArchiveFormat: ec.format.String(),
+		TargetDB:      ec.targetDB,
+		DatabaseType:  getDatabaseType(ec.format),
+		ExitCode:      ec.exitCode,
+		ErrorMessage:  errMessage,
+		ErrorType:     errType,
+		ErrorHint:     errHint,
+		TotalErrors:   ec.totalErrors,
+		LastStderr:    ec.stderrLines,
+		FirstErrors:   ec.firstErrors,
+	}
+	
+	// Get archive size
+	if stat, err := os.Stat(ec.archivePath); err == nil {
+		report.ArchiveSize = stat.Size()
+	}
+	
+	// Get tool versions
+	report.PostgresVersion = getCommandVersion("postgres", "--version")
+	report.PgRestoreVersion = getCommandVersion("pg_restore", "--version")
+	report.PsqlVersion = getCommandVersion("psql", "--version")
+	
+	// Analyze failure context
+	report.FailureContext = ec.analyzeFailureContext()
+	
+	// Run diagnosis if not already done
+	diagnoser := NewDiagnoser(ec.log, false)
+	if diagResult, err := diagnoser.DiagnoseFile(ec.archivePath); err == nil {
+		report.DiagnosisResult = diagResult
+	}
+	
+	// Generate recommendations
+	report.Recommendations = ec.generateRecommendations(report)
+	
+	return report
+}
+
+// analyzeFailureContext extracts context around the failure
+func (ec *ErrorCollector) analyzeFailureContext() *FailureContext {
+	ctx := &FailureContext{}
+	
+	// Look for line number in errors
+	for _, errLine := range ec.lastErrors {
+		if lineNum := extractLineNumber(errLine); lineNum > 0 {
+			ctx.FailedLine = lineNum
+			break
+		}
+	}
+	
+	// Look for COPY-related errors
+	for _, errLine := range ec.lastErrors {
+		if strings.Contains(errLine, "COPY") || strings.Contains(errLine, "syntax error") {
+			ctx.InCopyBlock = true
+			// Try to extract table name
+			if tableName := extractTableName(errLine); tableName != "" {
+				ctx.CopyTableName = tableName
+			}
+			break
+		}
+	}
+	
+	// If we have a line number, try to get surrounding context from the dump
+	if ctx.FailedLine > 0 && ec.archivePath != "" {
+		ctx.SurroundingLines = ec.getSurroundingLines(ctx.FailedLine, 5)
+	}
+	
+	return ctx
+}
+
+// getSurroundingLines reads lines around a specific line number from the dump
+func (ec *ErrorCollector) getSurroundingLines(lineNum int, context int) []string {
+	var reader io.Reader
+	var lines []string
+	
+	file, err := os.Open(ec.archivePath)
+	if err != nil {
+		return nil
+	}
+	defer file.Close()
+	
+	// Handle compressed files
+	if strings.HasSuffix(ec.archivePath, ".gz") {
+		gz, err := gzip.NewReader(file)
+		if err != nil {
+			return nil
+		}
+		defer gz.Close()
+		reader = gz
+	} else {
+		reader = file
+	}
+	
+	scanner := bufio.NewScanner(reader)
+	buf := make([]byte, 0, 1024*1024)
+	scanner.Buffer(buf, 10*1024*1024)
+	
+	currentLine := 0
+	startLine := lineNum - context
+	endLine := lineNum + context
+	
+	if startLine < 1 {
+		startLine = 1
+	}
+	
+	for scanner.Scan() {
+		currentLine++
+		if currentLine >= startLine && currentLine <= endLine {
+			prefix := "  "
+			if currentLine == lineNum {
+				prefix = "> "
+			}
+			lines = append(lines, fmt.Sprintf("%s%d: %s", prefix, currentLine, truncateString(scanner.Text(), 100)))
+		}
+		if currentLine > endLine {
+			break
+		}
+	}
+	
+	return lines
+}
+
+// generateRecommendations provides actionable recommendations based on the error
+func (ec *ErrorCollector) generateRecommendations(report *RestoreErrorReport) []string {
+	var recs []string
+	
+	// Check diagnosis results
+	if report.DiagnosisResult != nil {
+		if report.DiagnosisResult.IsTruncated {
+			recs = append(recs, 
+				"CRITICAL: Backup file is truncated/incomplete",
+				"Action: Re-run the backup for the affected database",
+				"Check: Verify disk space was available during backup",
+				"Check: Verify network was stable during backup transfer",
+			)
+		}
+		if report.DiagnosisResult.IsCorrupted {
+			recs = append(recs,
+				"CRITICAL: Backup file appears corrupted",
+				"Action: Restore from a previous backup",
+				"Action: Verify backup file checksum if available",
+			)
+		}
+		if report.DiagnosisResult.Details != nil && report.DiagnosisResult.Details.UnterminatedCopy {
+			recs = append(recs,
+				fmt.Sprintf("ISSUE: COPY block for table '%s' was not terminated", 
+					report.DiagnosisResult.Details.LastCopyTable),
+				"Cause: Backup was interrupted during data export",
+				"Action: Re-run backup ensuring it completes fully",
+			)
+		}
+	}
+	
+	// Check error patterns
+	if report.TotalErrors > 1000000 {
+		recs = append(recs,
+			"ISSUE: Millions of errors indicate structural problem, not individual data issues",
+			"Cause: Likely wrong restore method or truncated dump",
+			"Check: Verify dump format matches restore command",
+		)
+	}
+	
+	// Check for common error types
+	errLower := strings.ToLower(report.ErrorMessage)
+	if strings.Contains(errLower, "syntax error") {
+		recs = append(recs,
+			"ISSUE: SQL syntax errors during restore",
+			"Cause: COPY data being interpreted as SQL commands",
+			"Check: Run 'dbbackup restore diagnose <archive>' for detailed analysis",
+		)
+	}
+	
+	if strings.Contains(errLower, "permission denied") {
+		recs = append(recs,
+			"ISSUE: Permission denied",
+			"Action: Check database user has sufficient privileges",
+			"Action: For ownership preservation, use a superuser account",
+		)
+	}
+	
+	if strings.Contains(errLower, "does not exist") {
+		recs = append(recs,
+			"ISSUE: Missing object reference",
+			"Action: Ensure globals.sql was restored first (for roles/tablespaces)",
+			"Action: Check if target database was created",
+		)
+	}
+	
+	if len(recs) == 0 {
+		recs = append(recs,
+			"Run 'dbbackup restore diagnose <archive>' for detailed analysis",
+			"Check the stderr output above for specific error messages",
+			"Review the PostgreSQL/MySQL logs on the target server",
+		)
+	}
+	
+	return recs
+}
+
+// SaveReport saves the error report to a file
+func (ec *ErrorCollector) SaveReport(report *RestoreErrorReport, outputPath string) error {
+	// Create directory if needed
+	dir := filepath.Dir(outputPath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return fmt.Errorf("failed to create directory: %w", err)
+	}
+	
+	// Marshal to JSON with indentation
+	data, err := json.MarshalIndent(report, "", "  ")
+	if err != nil {
+		return fmt.Errorf("failed to marshal report: %w", err)
+	}
+	
+	// Write file
+	if err := os.WriteFile(outputPath, data, 0644); err != nil {
+		return fmt.Errorf("failed to write report: %w", err)
+	}
+	
+	return nil
+}
+
+// PrintReport prints a human-readable summary of the error report
+func (ec *ErrorCollector) PrintReport(report *RestoreErrorReport) {
+	fmt.Println()
+	fmt.Println(strings.Repeat("═", 70))
+	fmt.Println("  🔴 RESTORE ERROR REPORT")
+	fmt.Println(strings.Repeat("═", 70))
+	
+	fmt.Printf("\n📅 Timestamp:    %s\n", report.Timestamp.Format("2006-01-02 15:04:05"))
+	fmt.Printf("📦 Archive:      %s\n", filepath.Base(report.ArchivePath))
+	fmt.Printf("📊 Format:       %s\n", report.ArchiveFormat)
+	fmt.Printf("🎯 Target DB:    %s\n", report.TargetDB)
+	fmt.Printf("⚠️  Exit Code:    %d\n", report.ExitCode)
+	fmt.Printf("❌ Total Errors: %d\n", report.TotalErrors)
+	
+	fmt.Println("\n" + strings.Repeat("─", 70))
+	fmt.Println("ERROR DETAILS:")
+	fmt.Println(strings.Repeat("─", 70))
+	
+	fmt.Printf("\nType: %s\n", report.ErrorType)
+	fmt.Printf("Message: %s\n", report.ErrorMessage)
+	if report.ErrorHint != "" {
+		fmt.Printf("Hint: %s\n", report.ErrorHint)
+	}
+	
+	// Show failure context
+	if report.FailureContext != nil && report.FailureContext.FailedLine > 0 {
+		fmt.Println("\n" + strings.Repeat("─", 70))
+		fmt.Println("FAILURE CONTEXT:")
+		fmt.Println(strings.Repeat("─", 70))
+		
+		fmt.Printf("\nFailed at line: %d\n", report.FailureContext.FailedLine)
+		if report.FailureContext.InCopyBlock {
+			fmt.Printf("Inside COPY block for table: %s\n", report.FailureContext.CopyTableName)
+		}
+		
+		if len(report.FailureContext.SurroundingLines) > 0 {
+			fmt.Println("\nSurrounding lines:")
+			for _, line := range report.FailureContext.SurroundingLines {
+				fmt.Println(line)
+			}
+		}
+	}
+	
+	// Show first few errors
+	if len(report.FirstErrors) > 0 {
+		fmt.Println("\n" + strings.Repeat("─", 70))
+		fmt.Println("FIRST ERRORS:")
+		fmt.Println(strings.Repeat("─", 70))
+		
+		for i, err := range report.FirstErrors {
+			if i >= 5 {
+				fmt.Printf("... and %d more\n", len(report.FirstErrors)-5)
+				break
+			}
+			fmt.Printf("  %d. %s\n", i+1, truncateString(err, 100))
+		}
+	}
+	
+	// Show diagnosis summary
+	if report.DiagnosisResult != nil && !report.DiagnosisResult.IsValid {
+		fmt.Println("\n" + strings.Repeat("─", 70))
+		fmt.Println("DIAGNOSIS:")
+		fmt.Println(strings.Repeat("─", 70))
+		
+		if report.DiagnosisResult.IsTruncated {
+			fmt.Println("  ❌ File is TRUNCATED")
+		}
+		if report.DiagnosisResult.IsCorrupted {
+			fmt.Println("  ❌ File is CORRUPTED")
+		}
+		for i, err := range report.DiagnosisResult.Errors {
+			if i >= 3 {
+				break
+			}
+			fmt.Printf("  • %s\n", err)
+		}
+	}
+	
+	// Show recommendations
+	fmt.Println("\n" + strings.Repeat("─", 70))
+	fmt.Println("💡 RECOMMENDATIONS:")
+	fmt.Println(strings.Repeat("─", 70))
+	
+	for _, rec := range report.Recommendations {
+		fmt.Printf("  • %s\n", rec)
+	}
+	
+	// Show tool versions
+	fmt.Println("\n" + strings.Repeat("─", 70))
+	fmt.Println("ENVIRONMENT:")
+	fmt.Println(strings.Repeat("─", 70))
+	
+	fmt.Printf("  OS: %s/%s\n", report.OS, report.Arch)
+	fmt.Printf("  Go: %s\n", report.GoVersion)
+	if report.PgRestoreVersion != "" {
+		fmt.Printf("  pg_restore: %s\n", report.PgRestoreVersion)
+	}
+	if report.PsqlVersion != "" {
+		fmt.Printf("  psql: %s\n", report.PsqlVersion)
+	}
+	
+	fmt.Println(strings.Repeat("═", 70))
+}
+
+// Helper functions
+
+func isErrorLine(line string) bool {
+	return strings.Contains(line, "ERROR:") || 
+		strings.Contains(line, "FATAL:") || 
+		strings.Contains(line, "error:") ||
+		strings.Contains(line, "PANIC:")
+}
+
+func extractLineNumber(errLine string) int {
+	// Look for patterns like "LINE 1:" or "line 123"
+	patterns := []string{"LINE ", "line "}
+	for _, pattern := range patterns {
+		if idx := strings.Index(errLine, pattern); idx >= 0 {
+			numStart := idx + len(pattern)
+			numEnd := numStart
+			for numEnd < len(errLine) && errLine[numEnd] >= '0' && errLine[numEnd] <= '9' {
+				numEnd++
+			}
+			if numEnd > numStart {
+				var num int
+				fmt.Sscanf(errLine[numStart:numEnd], "%d", &num)
+				return num
+			}
+		}
+	}
+	return 0
+}
+
+func extractTableName(errLine string) string {
+	// Look for patterns like 'COPY "tablename"' or 'table "tablename"'
+	patterns := []string{"COPY ", "table "}
+	for _, pattern := range patterns {
+		if idx := strings.Index(errLine, pattern); idx >= 0 {
+			start := idx + len(pattern)
+			// Skip optional quote
+			if start < len(errLine) && errLine[start] == '"' {
+				start++
+			}
+			end := start
+			for end < len(errLine) && errLine[end] != '"' && errLine[end] != ' ' && errLine[end] != '(' {
+				end++
+			}
+			if end > start {
+				return errLine[start:end]
+			}
+		}
+	}
+	return ""
+}
+
+func getDatabaseType(format ArchiveFormat) string {
+	if format.IsMySQL() {
+		return "mysql"
+	}
+	return "postgresql"
+}
+
+func getCommandVersion(cmd string, arg string) string {
+	output, err := exec.Command(cmd, arg).CombinedOutput()
+	if err != nil {
+		return ""
+	}
+	// Return first line only
+	lines := strings.Split(string(output), "\n")
+	if len(lines) > 0 {
+		return strings.TrimSpace(lines[0])
+	}
+	return ""
+}

internal/tui/archive_browser.go

@@ -201,6 +201,12 @@ func (m ArchiveBrowserModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			if len(m.archives) > 0 && m.cursor < len(m.archives) {
 				selected := m.archives[m.cursor]
 
+				// Handle diagnose mode - go directly to diagnosis view
+				if m.mode == "diagnose" {
+					diagnoseView := NewDiagnoseView(m.config, m.logger, m.parent, m.ctx, selected)
+					return diagnoseView, diagnoseView.Init()
+				}
+
 				// Validate selection based on mode
 				if m.mode == "restore-cluster" && !selected.Format.IsClusterBackup() {
 					m.message = errorStyle.Render("❌ Please select a cluster backup (.tar.gz)")
@@ -227,6 +233,14 @@ func (m ArchiveBrowserModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					formatSize(selected.Size),
 					selected.Modified.Format("2006-01-02 15:04:05"))
 			}
+
+		case "d":
+			// Run diagnosis on selected archive
+			if len(m.archives) > 0 && m.cursor < len(m.archives) {
+				selected := m.archives[m.cursor]
+				diagnoseView := NewDiagnoseView(m.config, m.logger, m, m.ctx, selected)
+				return diagnoseView, diagnoseView.Init()
+			}
 		}
 	}
 
@@ -242,6 +256,8 @@ func (m ArchiveBrowserModel) View() string {
 		title = "📦 Select Archive to Restore (Single Database)"
 	} else if m.mode == "restore-cluster" {
 		title = "📦 Select Archive to Restore (Cluster)"
+	} else if m.mode == "diagnose" {
+		title = "🔍 Select Archive to Diagnose"
 	}
 
 	s.WriteString(titleStyle.Render(title))
@@ -335,7 +351,7 @@ func (m ArchiveBrowserModel) View() string {
 	s.WriteString(infoStyle.Render(fmt.Sprintf("Total: %d archive(s) | Selected: %d/%d",
 		len(m.archives), m.cursor+1, len(m.archives))))
 	s.WriteString("\n")
-	s.WriteString(infoStyle.Render("⌨️  ↑/↓: Navigate | Enter: Select | f: Filter | i: Info | Esc: Back"))
+	s.WriteString(infoStyle.Render("⌨️  ↑/↓: Navigate | Enter: Select | d: Diagnose | f: Filter | i: Info | Esc: Back"))
 
 	return s.String()
 }

internal/tui/diagnose_view.go

@@ -0,0 +1,463 @@
+package tui
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+
+	"dbbackup/internal/config"
+	"dbbackup/internal/logger"
+	"dbbackup/internal/restore"
+)
+
+var (
+	diagnoseBoxStyle = lipgloss.NewStyle().
+				Border(lipgloss.RoundedBorder()).
+				BorderForeground(lipgloss.Color("63")).
+				Padding(1, 2)
+
+	diagnosePassStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("2")).
+				Bold(true)
+
+	diagnoseFailStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("1")).
+				Bold(true)
+
+	diagnoseWarnStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("3"))
+
+	diagnoseInfoStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("244"))
+
+	diagnoseHeaderStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("63")).
+				Bold(true)
+)
+
+// DiagnoseViewModel shows backup file diagnosis results
+type DiagnoseViewModel struct {
+	config    *config.Config
+	logger    logger.Logger
+	parent    tea.Model
+	ctx       context.Context
+	archive   ArchiveInfo
+	result    *restore.DiagnoseResult
+	results   []*restore.DiagnoseResult // For cluster archives
+	running   bool
+	completed bool
+	progress  string
+	cursor    int // For scrolling through cluster results
+	err       error
+}
+
+// NewDiagnoseView creates a new diagnose view
+func NewDiagnoseView(cfg *config.Config, log logger.Logger, parent tea.Model, ctx context.Context, archive ArchiveInfo) DiagnoseViewModel {
+	return DiagnoseViewModel{
+		config:   cfg,
+		logger:   log,
+		parent:   parent,
+		ctx:      ctx,
+		archive:  archive,
+		running:  true,
+		progress: "Starting diagnosis...",
+	}
+}
+
+func (m DiagnoseViewModel) Init() tea.Cmd {
+	return runDiagnosis(m.config, m.logger, m.archive)
+}
+
+type diagnoseCompleteMsg struct {
+	result  *restore.DiagnoseResult
+	results []*restore.DiagnoseResult
+	err     error
+}
+
+type diagnoseProgressMsg struct {
+	message string
+}
+
+func runDiagnosis(cfg *config.Config, log logger.Logger, archive ArchiveInfo) tea.Cmd {
+	return func() tea.Msg {
+		diagnoser := restore.NewDiagnoser(log, true)
+
+		// For cluster archives, we can do deep analysis
+		if archive.Format.IsClusterBackup() {
+			// Create temp directory (use WorkDir if configured for large archives)
+			log.Info("Creating temp directory for diagnosis", "workDir", cfg.WorkDir)
+			tempDir, err := createTempDirIn(cfg.WorkDir, "dbbackup-diagnose-*")
+			if err != nil {
+				return diagnoseCompleteMsg{err: fmt.Errorf("failed to create temp dir (workDir=%s): %w", cfg.WorkDir, err)}
+			}
+			log.Info("Using temp directory", "path", tempDir)
+			defer removeTempDir(tempDir)
+
+			// Diagnose all dumps in the cluster
+			results, err := diagnoser.DiagnoseClusterDumps(archive.Path, tempDir)
+			if err != nil {
+				return diagnoseCompleteMsg{err: err}
+			}
+
+			return diagnoseCompleteMsg{results: results}
+		}
+
+		// Single file diagnosis
+		result, err := diagnoser.DiagnoseFile(archive.Path)
+		if err != nil {
+			return diagnoseCompleteMsg{err: err}
+		}
+
+		return diagnoseCompleteMsg{result: result}
+	}
+}
+
+func (m DiagnoseViewModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case diagnoseCompleteMsg:
+		m.running = false
+		m.completed = true
+		if msg.err != nil {
+			m.err = msg.err
+			return m, nil
+		}
+		m.result = msg.result
+		m.results = msg.results
+		return m, nil
+
+	case diagnoseProgressMsg:
+		m.progress = msg.message
+		return m, nil
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c", "q", "esc":
+			return m.parent, nil
+
+		case "up", "k":
+			if len(m.results) > 0 && m.cursor > 0 {
+				m.cursor--
+			}
+
+		case "down", "j":
+			if len(m.results) > 0 && m.cursor < len(m.results)-1 {
+				m.cursor++
+			}
+
+		case "enter", " ":
+			return m.parent, nil
+		}
+	}
+
+	return m, nil
+}
+
+func (m DiagnoseViewModel) View() string {
+	var s strings.Builder
+
+	// Header
+	s.WriteString(titleStyle.Render("🔍 Backup Diagnosis"))
+	s.WriteString("\n\n")
+
+	// Archive info
+	s.WriteString(diagnoseHeaderStyle.Render("Archive: "))
+	s.WriteString(m.archive.Name)
+	s.WriteString("\n")
+	s.WriteString(diagnoseHeaderStyle.Render("Format:  "))
+	s.WriteString(m.archive.Format.String())
+	s.WriteString("\n")
+	s.WriteString(diagnoseHeaderStyle.Render("Size:    "))
+	s.WriteString(formatSize(m.archive.Size))
+	s.WriteString("\n\n")
+
+	if m.running {
+		s.WriteString(infoStyle.Render("⏳ " + m.progress))
+		s.WriteString("\n\n")
+		s.WriteString(diagnoseInfoStyle.Render("This may take a while for large archives..."))
+		return s.String()
+	}
+
+	if m.err != nil {
+		s.WriteString(errorStyle.Render(fmt.Sprintf("❌ Diagnosis failed: %v", m.err)))
+		s.WriteString("\n\n")
+		s.WriteString(infoStyle.Render("Press Enter or Esc to go back"))
+		return s.String()
+	}
+
+	// For cluster archives, show summary + details
+	if len(m.results) > 0 {
+		s.WriteString(m.renderClusterResults())
+	} else if m.result != nil {
+		s.WriteString(m.renderSingleResult(m.result))
+	}
+
+	s.WriteString("\n")
+	s.WriteString(infoStyle.Render("Press Enter or Esc to go back"))
+
+	return s.String()
+}
+
+func (m DiagnoseViewModel) renderSingleResult(result *restore.DiagnoseResult) string {
+	var s strings.Builder
+
+	// Status
+	s.WriteString(strings.Repeat("─", 60))
+	s.WriteString("\n")
+
+	if result.IsValid {
+		s.WriteString(diagnosePassStyle.Render("✅ STATUS: VALID"))
+	} else {
+		s.WriteString(diagnoseFailStyle.Render("❌ STATUS: INVALID"))
+	}
+	s.WriteString("\n")
+
+	if result.IsTruncated {
+		s.WriteString(diagnoseFailStyle.Render("⚠️  TRUNCATED: File appears incomplete"))
+		s.WriteString("\n")
+	}
+
+	if result.IsCorrupted {
+		s.WriteString(diagnoseFailStyle.Render("⚠️  CORRUPTED: File structure is damaged"))
+		s.WriteString("\n")
+	}
+
+	s.WriteString(strings.Repeat("─", 60))
+	s.WriteString("\n\n")
+
+	// Details
+	if result.Details != nil {
+		s.WriteString(diagnoseHeaderStyle.Render("📊 DETAILS:"))
+		s.WriteString("\n")
+
+		if result.Details.HasPGDMPSignature {
+			s.WriteString(diagnosePassStyle.Render("  ✓ "))
+			s.WriteString("Has PGDMP signature (custom format)\n")
+		}
+
+		if result.Details.HasSQLHeader {
+			s.WriteString(diagnosePassStyle.Render("  ✓ "))
+			s.WriteString("Has PostgreSQL SQL header\n")
+		}
+
+		if result.Details.GzipValid {
+			s.WriteString(diagnosePassStyle.Render("  ✓ "))
+			s.WriteString("Gzip compression valid\n")
+		}
+
+		if result.Details.PgRestoreListable {
+			s.WriteString(diagnosePassStyle.Render("  ✓ "))
+			s.WriteString(fmt.Sprintf("pg_restore can list contents (%d tables)\n", result.Details.TableCount))
+		}
+
+		if result.Details.CopyBlockCount > 0 {
+			s.WriteString(diagnoseInfoStyle.Render("  • "))
+			s.WriteString(fmt.Sprintf("Contains %d COPY blocks\n", result.Details.CopyBlockCount))
+		}
+
+		if result.Details.UnterminatedCopy {
+			s.WriteString(diagnoseFailStyle.Render("  ✗ "))
+			s.WriteString(fmt.Sprintf("Unterminated COPY block: %s (line %d)\n",
+				result.Details.LastCopyTable, result.Details.LastCopyLineNumber))
+		}
+
+		if result.Details.ProperlyTerminated {
+			s.WriteString(diagnosePassStyle.Render("  ✓ "))
+			s.WriteString("All COPY blocks properly terminated\n")
+		}
+
+		if result.Details.ExpandedSize > 0 {
+			s.WriteString(diagnoseInfoStyle.Render("  • "))
+			s.WriteString(fmt.Sprintf("Expanded size: %s (ratio: %.1fx)\n",
+				formatSize(result.Details.ExpandedSize), result.Details.CompressionRatio))
+		}
+	}
+
+	// Errors
+	if len(result.Errors) > 0 {
+		s.WriteString("\n")
+		s.WriteString(diagnoseFailStyle.Render("❌ ERRORS:"))
+		s.WriteString("\n")
+		for i, e := range result.Errors {
+			if i >= 5 {
+				s.WriteString(diagnoseInfoStyle.Render(fmt.Sprintf("  ... and %d more\n", len(result.Errors)-5)))
+				break
+			}
+			s.WriteString(diagnoseFailStyle.Render("  • "))
+			s.WriteString(truncate(e, 70))
+			s.WriteString("\n")
+		}
+	}
+
+	// Warnings
+	if len(result.Warnings) > 0 {
+		s.WriteString("\n")
+		s.WriteString(diagnoseWarnStyle.Render("⚠️  WARNINGS:"))
+		s.WriteString("\n")
+		for i, w := range result.Warnings {
+			if i >= 3 {
+				s.WriteString(diagnoseInfoStyle.Render(fmt.Sprintf("  ... and %d more\n", len(result.Warnings)-3)))
+				break
+			}
+			s.WriteString(diagnoseWarnStyle.Render("  • "))
+			s.WriteString(truncate(w, 70))
+			s.WriteString("\n")
+		}
+	}
+
+	// Recommendations
+	if !result.IsValid {
+		s.WriteString("\n")
+		s.WriteString(diagnoseHeaderStyle.Render("💡 RECOMMENDATIONS:"))
+		s.WriteString("\n")
+		if result.IsTruncated {
+			s.WriteString("  1. Re-run the backup process for this database\n")
+			s.WriteString("  2. Check disk space on backup server\n")
+			s.WriteString("  3. Verify network stability for remote backups\n")
+		}
+		if result.IsCorrupted {
+			s.WriteString("  1. Verify backup was transferred completely\n")
+			s.WriteString("  2. Try restoring from a previous backup\n")
+		}
+	}
+
+	return s.String()
+}
+
+func (m DiagnoseViewModel) renderClusterResults() string {
+	var s strings.Builder
+
+	// Summary
+	validCount := 0
+	invalidCount := 0
+	for _, r := range m.results {
+		if r.IsValid {
+			validCount++
+		} else {
+			invalidCount++
+		}
+	}
+
+	s.WriteString(strings.Repeat("─", 60))
+	s.WriteString("\n")
+	s.WriteString(diagnoseHeaderStyle.Render(fmt.Sprintf("📊 CLUSTER SUMMARY: %d databases\n", len(m.results))))
+	s.WriteString(strings.Repeat("─", 60))
+	s.WriteString("\n\n")
+
+	if invalidCount == 0 {
+		s.WriteString(diagnosePassStyle.Render("✅ All dumps are valid"))
+		s.WriteString("\n\n")
+	} else {
+		s.WriteString(diagnoseFailStyle.Render(fmt.Sprintf("❌ %d/%d dumps have issues", invalidCount, len(m.results))))
+		s.WriteString("\n\n")
+	}
+
+	// List all dumps with status
+	s.WriteString(diagnoseHeaderStyle.Render("Database Dumps:"))
+	s.WriteString("\n")
+
+	// Show visible range based on cursor
+	start := m.cursor - 5
+	if start < 0 {
+		start = 0
+	}
+	end := start + 12
+	if end > len(m.results) {
+		end = len(m.results)
+	}
+
+	for i := start; i < end; i++ {
+		r := m.results[i]
+		cursor := " "
+		if i == m.cursor {
+			cursor = ">"
+		}
+
+		var status string
+		if r.IsValid {
+			status = diagnosePassStyle.Render("✓")
+		} else if r.IsTruncated {
+			status = diagnoseFailStyle.Render("✗ TRUNCATED")
+		} else if r.IsCorrupted {
+			status = diagnoseFailStyle.Render("✗ CORRUPTED")
+		} else {
+			status = diagnoseFailStyle.Render("✗ INVALID")
+		}
+
+		line := fmt.Sprintf("%s %s %-35s %s",
+			cursor,
+			status,
+			truncate(r.FileName, 35),
+			formatSize(r.FileSize))
+
+		if i == m.cursor {
+			s.WriteString(archiveSelectedStyle.Render(line))
+		} else {
+			s.WriteString(line)
+		}
+		s.WriteString("\n")
+	}
+
+	// Show selected dump details
+	if m.cursor < len(m.results) {
+		selected := m.results[m.cursor]
+		s.WriteString("\n")
+		s.WriteString(strings.Repeat("─", 60))
+		s.WriteString("\n")
+		s.WriteString(diagnoseHeaderStyle.Render("Selected: " + selected.FileName))
+		s.WriteString("\n\n")
+
+		// Show condensed details for selected
+		if selected.Details != nil {
+			if selected.Details.UnterminatedCopy {
+				s.WriteString(diagnoseFailStyle.Render("  ✗ Unterminated COPY: "))
+				s.WriteString(selected.Details.LastCopyTable)
+				s.WriteString(fmt.Sprintf(" (line %d)\n", selected.Details.LastCopyLineNumber))
+			}
+			if len(selected.Details.SampleCopyData) > 0 {
+				s.WriteString(diagnoseInfoStyle.Render("  Sample orphaned data: "))
+				s.WriteString(truncate(selected.Details.SampleCopyData[0], 50))
+				s.WriteString("\n")
+			}
+		}
+
+		if len(selected.Errors) > 0 {
+			for i, e := range selected.Errors {
+				if i >= 2 {
+					break
+				}
+				s.WriteString(diagnoseFailStyle.Render("  • "))
+				s.WriteString(truncate(e, 55))
+				s.WriteString("\n")
+			}
+		}
+	}
+
+	s.WriteString("\n")
+	s.WriteString(infoStyle.Render("Use ↑/↓ to browse, Enter/Esc to go back"))
+
+	return s.String()
+}
+
+// Helper functions for temp directory management
+func createTempDir(pattern string) (string, error) {
+	return os.MkdirTemp("", pattern)
+}
+
+func createTempDirIn(baseDir, pattern string) (string, error) {
+	if baseDir == "" {
+		return os.MkdirTemp("", pattern)
+	}
+	// Ensure base directory exists
+	if err := os.MkdirAll(baseDir, 0755); err != nil {
+		return "", fmt.Errorf("cannot create work directory: %w", err)
+	}
+	return os.MkdirTemp(baseDir, pattern)
+}
+
+func removeTempDir(path string) error {
+	return os.RemoveAll(path)
+}

internal/tui/menu.go

@@ -92,6 +92,7 @@ func NewMenuModel(cfg *config.Config, log logger.Logger) *MenuModel {
 			"────────────────────────────────",
 			"Restore Single Database",
 			"Restore Cluster Backup",
+			"Diagnose Backup File",
 			"List & Manage Backups",
 			"────────────────────────────────",
 			"View Active Operations",
@@ -163,19 +164,21 @@ func (m *MenuModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m.handleRestoreSingle()
 			case 5: // Restore Cluster Backup
 				return m.handleRestoreCluster()
-			case 6: // List & Manage Backups
+			case 6: // Diagnose Backup File
+				return m.handleDiagnoseBackup()
+			case 7: // List & Manage Backups
 				return m.handleBackupManager()
-			case 8: // View Active Operations
+			case 9: // View Active Operations
 				return m.handleViewOperations()
-			case 9: // Show Operation History
+			case 10: // Show Operation History
 				return m.handleOperationHistory()
-			case 10: // Database Status
+			case 11: // Database Status
 				return m.handleStatus()
-			case 11: // Settings
+			case 12: // Settings
 				return m.handleSettings()
-			case 12: // Clear History
+			case 13: // Clear History
 				m.message = "🗑️ History cleared"
-			case 13: // Quit
+			case 14: // Quit
 				if m.cancel != nil {
 					m.cancel()
 				}
@@ -244,21 +247,23 @@ func (m *MenuModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m.handleRestoreSingle()
 			case 5: // Restore Cluster Backup
 				return m.handleRestoreCluster()
-			case 6: // List & Manage Backups
+			case 6: // Diagnose Backup File
+				return m.handleDiagnoseBackup()
+			case 7: // List & Manage Backups
 				return m.handleBackupManager()
-			case 7: // Separator
+			case 8: // Separator
 				// Do nothing
-			case 8: // View Active Operations
+			case 9: // View Active Operations
 				return m.handleViewOperations()
-			case 9: // Show Operation History
+			case 10: // Show Operation History
 				return m.handleOperationHistory()
-			case 10: // Database Status
+			case 11: // Database Status
 				return m.handleStatus()
-			case 11: // Settings
+			case 12: // Settings
 				return m.handleSettings()
-			case 12: // Clear History
+			case 13: // Clear History
 				m.message = "🗑️ History cleared"
-			case 13: // Quit
+			case 14: // Quit
 				if m.cancel != nil {
 					m.cancel()
 				}
@@ -407,6 +412,12 @@ func (m *MenuModel) handleBackupManager() (tea.Model, tea.Cmd) {
 	return manager, manager.Init()
 }
 
+// handleDiagnoseBackup opens archive browser for diagnosis
+func (m *MenuModel) handleDiagnoseBackup() (tea.Model, tea.Cmd) {
+	browser := NewArchiveBrowser(m.config, m.logger, m, m.ctx, "diagnose")
+	return browser, browser.Init()
+}
+
 func (m *MenuModel) applyDatabaseSelection() {
 	if m == nil || len(m.dbTypes) == 0 {
 		return

internal/tui/restore_exec.go

@@ -31,6 +31,8 @@ type RestoreExecutionModel struct {
 	restoreType       string
 	cleanClusterFirst bool     // Drop all user databases before cluster restore
 	existingDBs       []string // List of databases to drop
+	saveDebugLog      bool     // Save detailed error report on failure
+	workDir           string   // Custom work directory for extraction
 
 	// Progress tracking
 	status        string
@@ -49,7 +51,7 @@ type RestoreExecutionModel struct {
 }
 
 // NewRestoreExecution creates a new restore execution model
-func NewRestoreExecution(cfg *config.Config, log logger.Logger, parent tea.Model, ctx context.Context, archive ArchiveInfo, targetDB string, cleanFirst, createIfMissing bool, restoreType string, cleanClusterFirst bool, existingDBs []string) RestoreExecutionModel {
+func NewRestoreExecution(cfg *config.Config, log logger.Logger, parent tea.Model, ctx context.Context, archive ArchiveInfo, targetDB string, cleanFirst, createIfMissing bool, restoreType string, cleanClusterFirst bool, existingDBs []string, saveDebugLog bool, workDir string) RestoreExecutionModel {
 	return RestoreExecutionModel{
 		config:            cfg,
 		logger:            log,
@@ -62,6 +64,8 @@ func NewRestoreExecution(cfg *config.Config, log logger.Logger, parent tea.Model
 		restoreType:       restoreType,
 		cleanClusterFirst: cleanClusterFirst,
 		existingDBs:       existingDBs,
+		saveDebugLog:      saveDebugLog,
+		workDir:           workDir,
 		status:            "Initializing...",
 		phase:             "Starting",
 		startTime:         time.Now(),
@@ -73,7 +77,7 @@ func NewRestoreExecution(cfg *config.Config, log logger.Logger, parent tea.Model
 
 func (m RestoreExecutionModel) Init() tea.Cmd {
 	return tea.Batch(
-		executeRestoreWithTUIProgress(m.ctx, m.config, m.logger, m.archive, m.targetDB, m.cleanFirst, m.createIfMissing, m.restoreType, m.cleanClusterFirst, m.existingDBs),
+		executeRestoreWithTUIProgress(m.ctx, m.config, m.logger, m.archive, m.targetDB, m.cleanFirst, m.createIfMissing, m.restoreType, m.cleanClusterFirst, m.existingDBs, m.saveDebugLog),
 		restoreTickCmd(),
 	)
 }
@@ -99,7 +103,7 @@ type restoreCompleteMsg struct {
 	elapsed time.Duration
 }
 
-func executeRestoreWithTUIProgress(parentCtx context.Context, cfg *config.Config, log logger.Logger, archive ArchiveInfo, targetDB string, cleanFirst, createIfMissing bool, restoreType string, cleanClusterFirst bool, existingDBs []string) tea.Cmd {
+func executeRestoreWithTUIProgress(parentCtx context.Context, cfg *config.Config, log logger.Logger, archive ArchiveInfo, targetDB string, cleanFirst, createIfMissing bool, restoreType string, cleanClusterFirst bool, existingDBs []string, saveDebugLog bool) tea.Cmd {
 	return func() tea.Msg {
 		// Use configurable cluster timeout (minutes) from config; default set in config.New()
 		// Use parent context to inherit cancellation from TUI
@@ -146,6 +150,14 @@ func executeRestoreWithTUIProgress(parentCtx context.Context, cfg *config.Config
 		// STEP 2: Create restore engine with silent progress (no stdout interference with TUI)
 		engine := restore.NewSilent(cfg, log, dbClient)
 
+		// Enable debug logging if requested
+		if saveDebugLog {
+			// Generate debug log path based on archive name and timestamp
+			debugLogPath := fmt.Sprintf("/tmp/dbbackup-restore-debug-%s.json", time.Now().Format("20060102-150405"))
+			engine.SetDebugLogPath(debugLogPath)
+			log.Info("Debug logging enabled", "path", debugLogPath)
+		}
+
 		// Set up progress callback (but it won't work in goroutine - progress is already sent via logs)
 		// The TUI will just use spinner animation to show activity
 

internal/tui/restore_preview.go

@@ -59,6 +59,8 @@ type RestorePreviewModel struct {
 	checking          bool
 	canProceed        bool
 	message           string
+	saveDebugLog      bool   // Save detailed error report on failure
+	workDir           string // Custom work directory for extraction
 }
 
 // NewRestorePreview creates a new restore preview
@@ -80,8 +82,10 @@ func NewRestorePreview(cfg *config.Config, log logger.Logger, parent tea.Model,
 		cleanFirst:      false,
 		createIfMissing: true,
 		checking:        true,
+		workDir:         cfg.WorkDir, // Use configured work directory
 		safetyChecks: []SafetyCheck{
 			{Name: "Archive integrity", Status: "pending", Critical: true},
+			{Name: "Dump validity", Status: "pending", Critical: true},
 			{Name: "Disk space", Status: "pending", Critical: true},
 			{Name: "Required tools", Status: "pending", Critical: true},
 			{Name: "Target database", Status: "pending", Critical: false},
@@ -102,7 +106,7 @@ type safetyCheckCompleteMsg struct {
 
 func runSafetyChecks(cfg *config.Config, log logger.Logger, archive ArchiveInfo, targetDB string) tea.Cmd {
 	return func() tea.Msg {
-		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+		ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
 		defer cancel()
 
 		safety := restore.NewSafety(cfg, log)
@@ -121,7 +125,33 @@ func runSafetyChecks(cfg *config.Config, log logger.Logger, archive ArchiveInfo,
 		}
 		checks = append(checks, check)
 
-		// 2. Disk space
+		// 2. Dump validity (deep diagnosis)
+		check = SafetyCheck{Name: "Dump validity", Status: "checking", Critical: true}
+		diagnoser := restore.NewDiagnoser(log, false)
+		diagResult, diagErr := diagnoser.DiagnoseFile(archive.Path)
+		if diagErr != nil {
+			check.Status = "warning"
+			check.Message = fmt.Sprintf("Cannot diagnose: %v", diagErr)
+		} else if !diagResult.IsValid {
+			check.Status = "failed"
+			check.Critical = true
+			if diagResult.IsTruncated {
+				check.Message = "Dump is TRUNCATED - restore will fail"
+			} else if diagResult.IsCorrupted {
+				check.Message = "Dump is CORRUPTED - restore will fail"
+			} else if len(diagResult.Errors) > 0 {
+				check.Message = diagResult.Errors[0]
+			} else {
+				check.Message = "Dump has validation errors"
+			}
+			canProceed = false
+		} else {
+			check.Status = "passed"
+			check.Message = "Dump structure verified"
+		}
+		checks = append(checks, check)
+
+		// 3. Disk space
 		check = SafetyCheck{Name: "Disk space", Status: "checking", Critical: true}
 		multiplier := 3.0
 		if archive.Format.IsClusterBackup() {
@@ -137,7 +167,7 @@ func runSafetyChecks(cfg *config.Config, log logger.Logger, archive ArchiveInfo,
 		}
 		checks = append(checks, check)
 
-		// 3. Required tools
+		// 4. Required tools
 		check = SafetyCheck{Name: "Required tools", Status: "checking", Critical: true}
 		dbType := "postgres"
 		if archive.Format.IsMySQL() {
@@ -153,7 +183,7 @@ func runSafetyChecks(cfg *config.Config, log logger.Logger, archive ArchiveInfo,
 		}
 		checks = append(checks, check)
 
-		// 4. Target database check (skip for cluster restores)
+		// 5. Target database check (skip for cluster restores)
 		existingDBCount := 0
 		existingDBs := []string{}
 
@@ -243,6 +273,27 @@ func (m RestorePreviewModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				m.message = fmt.Sprintf("Create if missing: %v", m.createIfMissing)
 			}
 
+		case "d":
+			// Toggle debug log saving
+			m.saveDebugLog = !m.saveDebugLog
+			if m.saveDebugLog {
+				m.message = infoStyle.Render("📋 Debug log: enabled (will save detailed report on failure)")
+			} else {
+				m.message = "Debug log: disabled"
+			}
+
+		case "w":
+			// Toggle/set work directory
+			if m.workDir == "" {
+				// Set to backup directory as default alternative
+				m.workDir = m.config.BackupDir
+				m.message = infoStyle.Render(fmt.Sprintf("📁 Work directory set to: %s", m.workDir))
+			} else {
+				// Clear work directory (use system temp)
+				m.workDir = ""
+				m.message = "Work directory: using system temp"
+			}
+
 		case "enter", " ":
 			if m.checking {
 				m.message = "Please wait for safety checks to complete..."
@@ -255,7 +306,7 @@ func (m RestorePreviewModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			}
 
 			// Proceed to restore execution
-			exec := NewRestoreExecution(m.config, m.logger, m.parent, m.ctx, m.archive, m.targetDB, m.cleanFirst, m.createIfMissing, m.mode, m.cleanClusterFirst, m.existingDBs)
+			exec := NewRestoreExecution(m.config, m.logger, m.parent, m.ctx, m.archive, m.targetDB, m.cleanFirst, m.createIfMissing, m.mode, m.cleanClusterFirst, m.existingDBs, m.saveDebugLog, m.workDir)
 			return exec, exec.Init()
 		}
 	}
@@ -390,6 +441,41 @@ func (m RestorePreviewModel) View() string {
 		s.WriteString("\n\n")
 	}
 
+	// Advanced Options
+	s.WriteString(archiveHeaderStyle.Render("⚙️  Advanced Options"))
+	s.WriteString("\n")
+	
+	// Work directory option
+	workDirIcon := "✗"
+	workDirStyle := infoStyle
+	workDirValue := "(system temp)"
+	if m.workDir != "" {
+		workDirIcon = "✓"
+		workDirStyle = checkPassedStyle
+		workDirValue = m.workDir
+	}
+	s.WriteString(workDirStyle.Render(fmt.Sprintf("  %s Work Dir: %s (press 'w' to toggle)", workDirIcon, workDirValue)))
+	s.WriteString("\n")
+	if m.workDir == "" {
+		s.WriteString(infoStyle.Render("    ⚠️  Large archives need more space than /tmp may have"))
+		s.WriteString("\n")
+	}
+	
+	// Debug log option
+	debugIcon := "✗"
+	debugStyle := infoStyle
+	if m.saveDebugLog {
+		debugIcon = "✓"
+		debugStyle = checkPassedStyle
+	}
+	s.WriteString(debugStyle.Render(fmt.Sprintf("  %s Debug Log: %v (press 'd' to toggle)", debugIcon, m.saveDebugLog)))
+	s.WriteString("\n")
+	if m.saveDebugLog {
+		s.WriteString(infoStyle.Render("    Saves detailed error report to /tmp on failure"))
+		s.WriteString("\n")
+	}
+	s.WriteString("\n")
+
 	// Message
 	if m.message != "" {
 		s.WriteString(m.message)
@@ -403,15 +489,15 @@ func (m RestorePreviewModel) View() string {
 		s.WriteString(successStyle.Render("✅ Ready to restore"))
 		s.WriteString("\n")
 		if m.mode == "restore-single" {
-			s.WriteString(infoStyle.Render("⌨️  t: Toggle clean-first | c: Toggle create | Enter: Proceed | Esc: Cancel"))
+			s.WriteString(infoStyle.Render("⌨️  t: Clean-first | c: Create | w: WorkDir | d: Debug | Enter: Proceed | Esc: Cancel"))
 		} else if m.mode == "restore-cluster" {
 			if m.existingDBCount > 0 {
-				s.WriteString(infoStyle.Render("⌨️  c: Toggle cleanup | Enter: Proceed | Esc: Cancel"))
+				s.WriteString(infoStyle.Render("⌨️  c: Cleanup | w: WorkDir | d: Debug | Enter: Proceed | Esc: Cancel"))
 			} else {
-				s.WriteString(infoStyle.Render("⌨️  Enter: Proceed | Esc: Cancel"))
+				s.WriteString(infoStyle.Render("⌨️  w: WorkDir | d: Debug | Enter: Proceed | Esc: Cancel"))
 			}
 		} else {
-			s.WriteString(infoStyle.Render("⌨️  Enter: Proceed | Esc: Cancel"))
+			s.WriteString(infoStyle.Render("⌨️  w: WorkDir | d: Debug | Enter: Proceed | Esc: Cancel"))
 		}
 	} else {
 		s.WriteString(errorStyle.Render("❌ Cannot proceed - please fix errors above"))

internal/tui/settings.go

@@ -115,6 +115,26 @@ func NewSettingsModel(cfg *config.Config, log logger.Logger, parent tea.Model) S
 			Type:        "path",
 			Description: "Directory where backup files will be stored",
 		},
+		{
+			Key:         "work_dir",
+			DisplayName: "Work Directory",
+			Value: func(c *config.Config) string {
+				if c.WorkDir == "" {
+					return "(system temp)"
+				}
+				return c.WorkDir
+			},
+			Update: func(c *config.Config, v string) error {
+				if v == "" || v == "(system temp)" {
+					c.WorkDir = ""
+					return nil
+				}
+				c.WorkDir = filepath.Clean(v)
+				return nil
+			},
+			Type:        "path",
+			Description: "Working directory for large operations (extraction, diagnosis). Use when /tmp is too small.",
+		},
 		{
 			Key:         "compression_level",
 			DisplayName: "Compression Level",

main.go

@@ -16,7 +16,7 @@ import (
 
 // Build information (set by ldflags)
 var (
-	version   = "3.1.0"
+	version   = "3.40.0"
 	buildTime = "unknown"
 	gitCommit = "unknown"
 )