Migration Architect

{
  "schema_version": "2.0",
  "database": "user_management_v2",
  "tables": {
    "users": {
      "columns": {
        "id": {
          "type": "bigint",
          "nullable": false,
          "primary_key": true,
          "auto_increment": true
        },
        "username": {
          "type": "varchar",
          "length": 50,
          "nullable": false,
          "unique": true
        },
        "email": {
          "type": "varchar",
          "length": 320,
          "nullable": false,
          "unique": true
        },
        "password_hash": {
          "type": "varchar",
          "length": 255,
          "nullable": false
        },
        "first_name": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "last_name": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "updated_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        },
        "is_active": {
          "type": "boolean",
          "nullable": false,
          "default": true
        },
        "phone": {
          "type": "varchar",
          "length": 20,
          "nullable": true
        },
        "email_verified_at": {
          "type": "timestamp",
          "nullable": true,
          "comment": "When email was verified"
        },
        "phone_verified_at": {
          "type": "timestamp", 
          "nullable": true,
          "comment": "When phone was verified"
        },
        "two_factor_enabled": {
          "type": "boolean",
          "nullable": false,
          "default": false
        },
        "last_login_at": {
          "type": "timestamp",
          "nullable": true
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [
          "username",
          "email"
        ],
        "foreign_key": [],
        "check": [
          "email LIKE '%@%'",
          "LENGTH(password_hash) >= 60",
          "phone IS NULL OR LENGTH(phone) >= 10"
        ]
      },
      "indexes": [
        {
          "name": "idx_users_email",
          "columns": ["email"],
          "unique": true
        },
        {
          "name": "idx_users_username",
          "columns": ["username"],
          "unique": true
        },
        {
          "name": "idx_users_created_at",
          "columns": ["created_at"]
        },
        {
          "name": "idx_users_email_verified",
          "columns": ["email_verified_at"]
        },
        {
          "name": "idx_users_last_login",
          "columns": ["last_login_at"]
        }
      ]
    },
    "user_profiles": {
      "columns": {
        "id": {
          "type": "bigint",
          "nullable": false,
          "primary_key": true,
          "auto_increment": true
        },
        "user_id": {
          "type": "bigint",
          "nullable": false
        },
        "bio": {
          "type": "text",
          "nullable": true
        },
        "avatar_url": {
          "type": "varchar",
          "length": 500,
          "nullable": true
        },
        "birth_date": {
          "type": "date",
          "nullable": true
        },
        "location": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "website": {
          "type": "varchar",
          "length": 255,
          "nullable": true
        },
        "privacy_level": {
          "type": "varchar",
          "length": 20,
          "nullable": false,
          "default": "public"
        },
        "timezone": {
          "type": "varchar",
          "length": 50,
          "nullable": true,
          "default": "UTC"
        },
        "language": {
          "type": "varchar",
          "length": 10,
          "nullable": false,
          "default": "en"
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "updated_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [],
        "foreign_key": [
          {
            "columns": ["user_id"],
            "references": "users(id)",
            "on_delete": "CASCADE"
          }
        ],
        "check": [
          "privacy_level IN ('public', 'private', 'friends_only')",
          "bio IS NULL OR LENGTH(bio) <= 2000",
          "language IN ('en', 'es', 'fr', 'de', 'it', 'pt', 'ru', 'ja', 'ko', 'zh')"
        ]
      },
      "indexes": [
        {
          "name": "idx_user_profiles_user_id",
          "columns": ["user_id"],
          "unique": true
        },
        {
          "name": "idx_user_profiles_privacy",
          "columns": ["privacy_level"]
        },
        {
          "name": "idx_user_profiles_language",
          "columns": ["language"]
        }
      ]
    },
    "user_sessions": {
      "columns": {
        "id": {
          "type": "varchar",
          "length": 128,
          "nullable": false,
          "primary_key": true
        },
        "user_id": {
          "type": "bigint",
          "nullable": false
        },
        "ip_address": {
          "type": "varchar",
          "length": 45,
          "nullable": true
        },
        "user_agent": {
          "type": "text",
          "nullable": true
        },
        "expires_at": {
          "type": "timestamp",
          "nullable": false
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "last_activity": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        },
        "session_type": {
          "type": "varchar",
          "length": 20,
          "nullable": false,
          "default": "web"
        },
        "is_mobile": {
          "type": "boolean",
          "nullable": false,
          "default": false
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [],
        "foreign_key": [
          {
            "columns": ["user_id"],
            "references": "users(id)",
            "on_delete": "CASCADE"
          }
        ],
        "check": [
          "session_type IN ('web', 'mobile', 'api', 'admin')"
        ]
      },
      "indexes": [
        {
          "name": "idx_user_sessions_user_id",
          "columns": ["user_id"]
        },
        {
          "name": "idx_user_sessions_expires",
          "columns": ["expires_at"]
        },
        {
          "name": "idx_user_sessions_type",
          "columns": ["session_type"]
        }
      ]
    },
    "user_preferences": {
      "columns": {
        "id": {
          "type": "bigint",
          "nullable": false,
          "primary_key": true,
          "auto_increment": true
        },
        "user_id": {
          "type": "bigint",
          "nullable": false
        },
        "preference_key": {
          "type": "varchar",
          "length": 100,
          "nullable": false
        },
        "preference_value": {
          "type": "json",
          "nullable": true
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "updated_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [
          ["user_id", "preference_key"]
        ],
        "foreign_key": [
          {
            "columns": ["user_id"],
            "references": "users(id)",
            "on_delete": "CASCADE"
          }
        ],
        "check": []
      },
      "indexes": [
        {
          "name": "idx_user_preferences_user_key",
          "columns": ["user_id", "preference_key"],
          "unique": true
        }
      ]
    }
  },
  "views": {
    "active_users": {
      "definition": "SELECT u.id, u.username, u.email, u.first_name, u.last_name, u.email_verified_at, u.last_login_at FROM users u WHERE u.is_active = true",
      "columns": ["id", "username", "email", "first_name", "last_name", "email_verified_at", "last_login_at"]
    },
    "verified_users": {
      "definition": "SELECT u.id, u.username, u.email FROM users u WHERE u.is_active = true AND u.email_verified_at IS NOT NULL",
      "columns": ["id", "username", "email"]
    }
  },
  "procedures": [
    {
      "name": "cleanup_expired_sessions",
      "parameters": [],
      "definition": "DELETE FROM user_sessions WHERE expires_at < NOW()"
    },
    {
      "name": "get_user_with_profile",
      "parameters": ["user_id BIGINT"],
      "definition": "SELECT u.*, p.bio, p.avatar_url, p.privacy_level FROM users u LEFT JOIN user_profiles p ON u.id = p.user_id WHERE u.id = user_id"
    }
  ]
}

{
  "schema_version": "1.0",
  "database": "user_management",
  "tables": {
    "users": {
      "columns": {
        "id": {
          "type": "bigint",
          "nullable": false,
          "primary_key": true,
          "auto_increment": true
        },
        "username": {
          "type": "varchar",
          "length": 50,
          "nullable": false,
          "unique": true
        },
        "email": {
          "type": "varchar",
          "length": 255,
          "nullable": false,
          "unique": true
        },
        "password_hash": {
          "type": "varchar",
          "length": 255,
          "nullable": false
        },
        "first_name": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "last_name": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "updated_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        },
        "is_active": {
          "type": "boolean",
          "nullable": false,
          "default": true
        },
        "phone": {
          "type": "varchar",
          "length": 20,
          "nullable": true
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [
          "username",
          "email"
        ],
        "foreign_key": [],
        "check": [
          "email LIKE '%@%'",
          "LENGTH(password_hash) >= 60"
        ]
      },
      "indexes": [
        {
          "name": "idx_users_email",
          "columns": ["email"],
          "unique": true
        },
        {
          "name": "idx_users_username", 
          "columns": ["username"],
          "unique": true
        },
        {
          "name": "idx_users_created_at",
          "columns": ["created_at"]
        }
      ]
    },
    "user_profiles": {
      "columns": {
        "id": {
          "type": "bigint",
          "nullable": false,
          "primary_key": true,
          "auto_increment": true
        },
        "user_id": {
          "type": "bigint",
          "nullable": false
        },
        "bio": {
          "type": "varchar",
          "length": 255,
          "nullable": true
        },
        "avatar_url": {
          "type": "varchar",
          "length": 500,
          "nullable": true
        },
        "birth_date": {
          "type": "date",
          "nullable": true
        },
        "location": {
          "type": "varchar",
          "length": 100,
          "nullable": true
        },
        "website": {
          "type": "varchar",
          "length": 255,
          "nullable": true
        },
        "privacy_level": {
          "type": "varchar",
          "length": 20,
          "nullable": false,
          "default": "public"
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "updated_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [],
        "foreign_key": [
          {
            "columns": ["user_id"],
            "references": "users(id)",
            "on_delete": "CASCADE"
          }
        ],
        "check": [
          "privacy_level IN ('public', 'private', 'friends_only')"
        ]
      },
      "indexes": [
        {
          "name": "idx_user_profiles_user_id",
          "columns": ["user_id"],
          "unique": true
        },
        {
          "name": "idx_user_profiles_privacy",
          "columns": ["privacy_level"]
        }
      ]
    },
    "user_sessions": {
      "columns": {
        "id": {
          "type": "varchar",
          "length": 128,
          "nullable": false,
          "primary_key": true
        },
        "user_id": {
          "type": "bigint",
          "nullable": false
        },
        "ip_address": {
          "type": "varchar",
          "length": 45,
          "nullable": true
        },
        "user_agent": {
          "type": "varchar",
          "length": 500,
          "nullable": true
        },
        "expires_at": {
          "type": "timestamp",
          "nullable": false
        },
        "created_at": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP"
        },
        "last_activity": {
          "type": "timestamp",
          "nullable": false,
          "default": "CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP"
        }
      },
      "constraints": {
        "primary_key": ["id"],
        "unique": [],
        "foreign_key": [
          {
            "columns": ["user_id"],
            "references": "users(id)",
            "on_delete": "CASCADE"
          }
        ],
        "check": []
      },
      "indexes": [
        {
          "name": "idx_user_sessions_user_id",
          "columns": ["user_id"]
        },
        {
          "name": "idx_user_sessions_expires",
          "columns": ["expires_at"]
        }
      ]
    }
  },
  "views": {
    "active_users": {
      "definition": "SELECT u.id, u.username, u.email, u.first_name, u.last_name FROM users u WHERE u.is_active = true",
      "columns": ["id", "username", "email", "first_name", "last_name"]
    }
  },
  "procedures": [
    {
      "name": "cleanup_expired_sessions",
      "parameters": [],
      "definition": "DELETE FROM user_sessions WHERE expires_at < NOW()"
    }
  ]
}

{
  "type": "database",
  "pattern": "schema_change",
  "source": "PostgreSQL 13 Production Database",
  "target": "PostgreSQL 15 Cloud Database",
  "description": "Migrate user management system from on-premises PostgreSQL to cloud with schema updates",
  "constraints": {
    "max_downtime_minutes": 30,
    "data_volume_gb": 2500,
    "dependencies": [
      "user_service_api",
      "authentication_service",
      "notification_service",
      "analytics_pipeline",
      "backup_service"
    ],
    "compliance_requirements": [
      "GDPR",
      "SOX"
    ],
    "special_requirements": [
      "zero_data_loss",
      "referential_integrity",
      "performance_baseline_maintained"
    ]
  },
  "tables_to_migrate": [
    {
      "name": "users",
      "row_count": 1500000,
      "size_mb": 450,
      "critical": true
    },
    {
      "name": "user_profiles",
      "row_count": 1500000,
      "size_mb": 890,
      "critical": true
    },
    {
      "name": "user_sessions",
      "row_count": 25000000,
      "size_mb": 1200,
      "critical": false
    },
    {
      "name": "audit_logs",
      "row_count": 50000000,
      "size_mb": 2800,
      "critical": false
    }
  ],
  "schema_changes": [
    {
      "table": "users",
      "changes": [
        {
          "type": "add_column",
          "column": "email_verified_at",
          "data_type": "timestamp",
          "nullable": true
        },
        {
          "type": "add_column", 
          "column": "phone_verified_at",
          "data_type": "timestamp",
          "nullable": true
        }
      ]
    },
    {
      "table": "user_profiles",
      "changes": [
        {
          "type": "modify_column",
          "column": "bio",
          "old_type": "varchar(255)",
          "new_type": "text"
        },
        {
          "type": "add_constraint",
          "constraint_type": "check",
          "constraint_name": "bio_length_check",
          "definition": "LENGTH(bio) <= 2000"
        }
      ]
    }
  ],
  "performance_requirements": {
    "max_query_response_time_ms": 100,
    "concurrent_connections": 500,
    "transactions_per_second": 1000
  },
  "business_continuity": {
    "critical_business_hours": {
      "start": "08:00",
      "end": "18:00", 
      "timezone": "UTC"
    },
    "preferred_migration_window": {
      "start": "02:00",
      "end": "06:00",
      "timezone": "UTC"
    }
  }
}

{
  "type": "service",
  "pattern": "strangler_fig",
  "source": "Legacy User Service (Java Spring Boot 2.x)",
  "target": "New User Service (Node.js + TypeScript)",
  "description": "Migrate legacy user management service to modern microservices architecture",
  "constraints": {
    "max_downtime_minutes": 0,
    "data_volume_gb": 50,
    "dependencies": [
      "payment_service",
      "order_service", 
      "notification_service",
      "analytics_service",
      "mobile_app_v1",
      "mobile_app_v2",
      "web_frontend",
      "admin_dashboard"
    ],
    "compliance_requirements": [
      "PCI_DSS",
      "GDPR"
    ],
    "special_requirements": [
      "api_backward_compatibility",
      "session_continuity",
      "rate_limit_preservation"
    ]
  },
  "service_details": {
    "legacy_service": {
      "endpoints": [
        "GET /api/v1/users/{id}",
        "POST /api/v1/users",
        "PUT /api/v1/users/{id}",
        "DELETE /api/v1/users/{id}",
        "GET /api/v1/users/{id}/profile",
        "PUT /api/v1/users/{id}/profile",
        "POST /api/v1/users/{id}/verify-email",
        "POST /api/v1/users/login",
        "POST /api/v1/users/logout"
      ],
      "current_load": {
        "requests_per_second": 850,
        "peak_requests_per_second": 2000,
        "average_response_time_ms": 120,
        "p95_response_time_ms": 300
      },
      "infrastructure": {
        "instances": 4,
        "cpu_cores_per_instance": 4,
        "memory_gb_per_instance": 8,
        "load_balancer": "AWS ELB Classic"
      }
    },
    "new_service": {
      "endpoints": [
        "GET /api/v2/users/{id}",
        "POST /api/v2/users",
        "PUT /api/v2/users/{id}",
        "DELETE /api/v2/users/{id}",
        "GET /api/v2/users/{id}/profile",
        "PUT /api/v2/users/{id}/profile", 
        "POST /api/v2/users/{id}/verify-email",
        "POST /api/v2/users/{id}/verify-phone",
        "POST /api/v2/auth/login",
        "POST /api/v2/auth/logout",
        "POST /api/v2/auth/refresh"
      ],
      "target_performance": {
        "requests_per_second": 1500,
        "peak_requests_per_second": 3000,
        "average_response_time_ms": 80,
        "p95_response_time_ms": 200
      },
      "infrastructure": {
        "container_platform": "Kubernetes",
        "initial_replicas": 3,
        "max_replicas": 10,
        "cpu_request_millicores": 500,
        "cpu_limit_millicores": 1000,
        "memory_request_mb": 512,
        "memory_limit_mb": 1024,
        "load_balancer": "AWS ALB"
      }
    }
  },
  "migration_phases": [
    {
      "phase": "preparation",
      "description": "Deploy new service and configure routing",
      "estimated_duration_hours": 8
    },
    {
      "phase": "intercept",
      "description": "Configure API gateway to route to new service",
      "estimated_duration_hours": 2
    },
    {
      "phase": "gradual_migration",
      "description": "Gradually increase traffic to new service",
      "estimated_duration_hours": 48
    },
    {
      "phase": "validation",
      "description": "Validate new service performance and functionality",
      "estimated_duration_hours": 24
    },
    {
      "phase": "decommission",
      "description": "Remove legacy service after validation",
      "estimated_duration_hours": 4
    }
  ],
  "feature_flags": [
    {
      "name": "enable_new_user_service",
      "description": "Route user service requests to new implementation",
      "initial_percentage": 5,
      "rollout_schedule": [
        {"percentage": 5, "duration_hours": 24},
        {"percentage": 25, "duration_hours": 24},
        {"percentage": 50, "duration_hours": 24},
        {"percentage": 100, "duration_hours": 0}
      ]
    },
    {
      "name": "enable_new_auth_endpoints",
      "description": "Enable new authentication endpoints",
      "initial_percentage": 0,
      "rollout_schedule": [
        {"percentage": 10, "duration_hours": 12},
        {"percentage": 50, "duration_hours": 12},
        {"percentage": 100, "duration_hours": 0}
      ]
    }
  ],
  "monitoring": {
    "critical_metrics": [
      "request_rate",
      "error_rate", 
      "response_time_p95",
      "response_time_p99",
      "cpu_utilization",
      "memory_utilization",
      "database_connection_pool"
    ],
    "alert_thresholds": {
      "error_rate": 0.05,
      "response_time_p95": 250,
      "cpu_utilization": 0.80,
      "memory_utilization": 0.85
    }
  },
  "rollback_triggers": [
    {
      "metric": "error_rate",
      "threshold": 0.10,
      "duration_minutes": 5,
      "action": "automatic_rollback"
    },
    {
      "metric": "response_time_p95",
      "threshold": 500,
      "duration_minutes": 10,
      "action": "alert_team"
    },
    {
      "metric": "cpu_utilization",
      "threshold": 0.95,
      "duration_minutes": 5,
      "action": "scale_up"
    }
  ]
}

{
  "runbook_id": "rb_921c0bca",
  "migration_id": "23a52ed1507f",
  "created_at": "2026-02-16T13:47:31.108500",
  "rollback_phases": [
    {
      "phase_name": "rollback_cleanup",
      "description": "Rollback changes made during cleanup phase",
      "urgency_level": "medium",
      "estimated_duration_minutes": 570,
      "prerequisites": [
        "Incident commander assigned and briefed",
        "All team members notified of rollback initiation",
        "Monitoring systems confirmed operational",
        "Backup systems verified and accessible"
      ],
      "steps": [
        {
          "step_id": "rb_validate_0_final",
          "name": "Validate rollback completion",
          "description": "Comprehensive validation that cleanup rollback completed successfully",
          "script_type": "manual",
          "script_content": "Execute validation checklist for this phase",
          "estimated_duration_minutes": 10,
          "dependencies": [],
          "validation_commands": [
            "SELECT COUNT(*) FROM {table_name};",
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name = '{table_name}';",
            "SELECT COUNT(*) FROM information_schema.columns WHERE table_name = '{table_name}' AND column_name = '{column_name}';",
            "SELECT COUNT(DISTINCT {primary_key}) FROM {table_name};",
            "SELECT MAX({timestamp_column}) FROM {table_name};"
          ],
          "success_criteria": [
            "cleanup fully rolled back",
            "All validation checks pass"
          ],
          "failure_escalation": "Investigate cleanup rollback failures",
          "rollback_order": 99
        }
      ],
      "validation_checkpoints": [
        "cleanup rollback steps completed",
        "System health checks passing",
        "No critical errors in logs",
        "Key metrics within acceptable ranges",
        "Validation command passed: SELECT COUNT(*) FROM {table_name};...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH..."
      ],
      "communication_requirements": [
        "Notify incident commander of phase start/completion",
        "Update rollback status dashboard",
        "Log all actions and decisions"
      ],
      "risk_level": "medium"
    },
    {
      "phase_name": "rollback_contract",
      "description": "Rollback changes made during contract phase",
      "urgency_level": "medium",
      "estimated_duration_minutes": 570,
      "prerequisites": [
        "Incident commander assigned and briefed",
        "All team members notified of rollback initiation",
        "Monitoring systems confirmed operational",
        "Backup systems verified and accessible",
        "Previous rollback phase completed successfully"
      ],
      "steps": [
        {
          "step_id": "rb_validate_1_final",
          "name": "Validate rollback completion",
          "description": "Comprehensive validation that contract rollback completed successfully",
          "script_type": "manual",
          "script_content": "Execute validation checklist for this phase",
          "estimated_duration_minutes": 10,
          "dependencies": [],
          "validation_commands": [
            "SELECT COUNT(*) FROM {table_name};",
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name = '{table_name}';",
            "SELECT COUNT(*) FROM information_schema.columns WHERE table_name = '{table_name}' AND column_name = '{column_name}';",
            "SELECT COUNT(DISTINCT {primary_key}) FROM {table_name};",
            "SELECT MAX({timestamp_column}) FROM {table_name};"
          ],
          "success_criteria": [
            "contract fully rolled back",
            "All validation checks pass"
          ],
          "failure_escalation": "Investigate contract rollback failures",
          "rollback_order": 99
        }
      ],
      "validation_checkpoints": [
        "contract rollback steps completed",
        "System health checks passing",
        "No critical errors in logs",
        "Key metrics within acceptable ranges",
        "Validation command passed: SELECT COUNT(*) FROM {table_name};...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH..."
      ],
      "communication_requirements": [
        "Notify incident commander of phase start/completion",
        "Update rollback status dashboard",
        "Log all actions and decisions"
      ],
      "risk_level": "medium"
    },
    {
      "phase_name": "rollback_migrate",
      "description": "Rollback changes made during migrate phase",
      "urgency_level": "medium",
      "estimated_duration_minutes": 570,
      "prerequisites": [
        "Incident commander assigned and briefed",
        "All team members notified of rollback initiation",
        "Monitoring systems confirmed operational",
        "Backup systems verified and accessible",
        "Previous rollback phase completed successfully"
      ],
      "steps": [
        {
          "step_id": "rb_validate_2_final",
          "name": "Validate rollback completion",
          "description": "Comprehensive validation that migrate rollback completed successfully",
          "script_type": "manual",
          "script_content": "Execute validation checklist for this phase",
          "estimated_duration_minutes": 10,
          "dependencies": [],
          "validation_commands": [
            "SELECT COUNT(*) FROM {table_name};",
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name = '{table_name}';",
            "SELECT COUNT(*) FROM information_schema.columns WHERE table_name = '{table_name}' AND column_name = '{column_name}';",
            "SELECT COUNT(DISTINCT {primary_key}) FROM {table_name};",
            "SELECT MAX({timestamp_column}) FROM {table_name};"
          ],
          "success_criteria": [
            "migrate fully rolled back",
            "All validation checks pass"
          ],
          "failure_escalation": "Investigate migrate rollback failures",
          "rollback_order": 99
        }
      ],
      "validation_checkpoints": [
        "migrate rollback steps completed",
        "System health checks passing",
        "No critical errors in logs",
        "Key metrics within acceptable ranges",
        "Validation command passed: SELECT COUNT(*) FROM {table_name};...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH..."
      ],
      "communication_requirements": [
        "Notify incident commander of phase start/completion",
        "Update rollback status dashboard",
        "Log all actions and decisions"
      ],
      "risk_level": "medium"
    },
    {
      "phase_name": "rollback_expand",
      "description": "Rollback changes made during expand phase",
      "urgency_level": "medium",
      "estimated_duration_minutes": 570,
      "prerequisites": [
        "Incident commander assigned and briefed",
        "All team members notified of rollback initiation",
        "Monitoring systems confirmed operational",
        "Backup systems verified and accessible",
        "Previous rollback phase completed successfully"
      ],
      "steps": [
        {
          "step_id": "rb_validate_3_final",
          "name": "Validate rollback completion",
          "description": "Comprehensive validation that expand rollback completed successfully",
          "script_type": "manual",
          "script_content": "Execute validation checklist for this phase",
          "estimated_duration_minutes": 10,
          "dependencies": [],
          "validation_commands": [
            "SELECT COUNT(*) FROM {table_name};",
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name = '{table_name}';",
            "SELECT COUNT(*) FROM information_schema.columns WHERE table_name = '{table_name}' AND column_name = '{column_name}';",
            "SELECT COUNT(DISTINCT {primary_key}) FROM {table_name};",
            "SELECT MAX({timestamp_column}) FROM {table_name};"
          ],
          "success_criteria": [
            "expand fully rolled back",
            "All validation checks pass"
          ],
          "failure_escalation": "Investigate expand rollback failures",
          "rollback_order": 99
        }
      ],
      "validation_checkpoints": [
        "expand rollback steps completed",
        "System health checks passing",
        "No critical errors in logs",
        "Key metrics within acceptable ranges",
        "Validation command passed: SELECT COUNT(*) FROM {table_name};...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH..."
      ],
      "communication_requirements": [
        "Notify incident commander of phase start/completion",
        "Update rollback status dashboard",
        "Log all actions and decisions"
      ],
      "risk_level": "medium"
    },
    {
      "phase_name": "rollback_preparation",
      "description": "Rollback changes made during preparation phase",
      "urgency_level": "medium",
      "estimated_duration_minutes": 570,
      "prerequisites": [
        "Incident commander assigned and briefed",
        "All team members notified of rollback initiation",
        "Monitoring systems confirmed operational",
        "Backup systems verified and accessible",
        "Previous rollback phase completed successfully"
      ],
      "steps": [
        {
          "step_id": "rb_schema_4_01",
          "name": "Drop migration artifacts",
          "description": "Remove temporary migration tables and procedures",
          "script_type": "sql",
          "script_content": "-- Drop migration artifacts\nDROP TABLE IF EXISTS migration_log;\nDROP PROCEDURE IF EXISTS migrate_data();",
          "estimated_duration_minutes": 5,
          "dependencies": [],
          "validation_commands": [
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name LIKE '%migration%';"
          ],
          "success_criteria": [
            "No migration artifacts remain"
          ],
          "failure_escalation": "Manual cleanup required",
          "rollback_order": 1
        },
        {
          "step_id": "rb_validate_4_final",
          "name": "Validate rollback completion",
          "description": "Comprehensive validation that preparation rollback completed successfully",
          "script_type": "manual",
          "script_content": "Execute validation checklist for this phase",
          "estimated_duration_minutes": 10,
          "dependencies": [
            "rb_schema_4_01"
          ],
          "validation_commands": [
            "SELECT COUNT(*) FROM {table_name};",
            "SELECT COUNT(*) FROM information_schema.tables WHERE table_name = '{table_name}';",
            "SELECT COUNT(*) FROM information_schema.columns WHERE table_name = '{table_name}' AND column_name = '{column_name}';",
            "SELECT COUNT(DISTINCT {primary_key}) FROM {table_name};",
            "SELECT MAX({timestamp_column}) FROM {table_name};"
          ],
          "success_criteria": [
            "preparation fully rolled back",
            "All validation checks pass"
          ],
          "failure_escalation": "Investigate preparation rollback failures",
          "rollback_order": 99
        }
      ],
      "validation_checkpoints": [
        "preparation rollback steps completed",
        "System health checks passing",
        "No critical errors in logs",
        "Key metrics within acceptable ranges",
        "Validation command passed: SELECT COUNT(*) FROM {table_name};...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...",
        "Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH..."
      ],
      "communication_requirements": [
        "Notify incident commander of phase start/completion",
        "Update rollback status dashboard",
        "Log all actions and decisions"
      ],
      "risk_level": "medium"
    }
  ],
  "trigger_conditions": [
    {
      "trigger_id": "error_rate_spike",
      "name": "Error Rate Spike",
      "condition": "error_rate > baseline * 5 for 5 minutes",
      "metric_threshold": {
        "metric": "error_rate",
        "operator": "greater_than",
        "value": "baseline_error_rate * 5",
        "duration_minutes": 5
      },
      "evaluation_window_minutes": 5,
      "auto_execute": true,
      "escalation_contacts": [
        "on_call_engineer",
        "migration_lead"
      ]
    },
    {
      "trigger_id": "response_time_degradation",
      "name": "Response Time Degradation",
      "condition": "p95_response_time > baseline * 3 for 10 minutes",
      "metric_threshold": {
        "metric": "p95_response_time",
        "operator": "greater_than",
        "value": "baseline_p95 * 3",
        "duration_minutes": 10
      },
      "evaluation_window_minutes": 10,
      "auto_execute": false,
      "escalation_contacts": [
        "performance_team",
        "migration_lead"
      ]
    },
    {
      "trigger_id": "availability_drop",
      "name": "Service Availability Drop",
      "condition": "availability < 95% for 2 minutes",
      "metric_threshold": {
        "metric": "availability",
        "operator": "less_than",
        "value": 0.95,
        "duration_minutes": 2
      },
      "evaluation_window_minutes": 2,
      "auto_execute": true,
      "escalation_contacts": [
        "sre_team",
        "incident_commander"
      ]
    },
    {
      "trigger_id": "data_integrity_failure",
      "name": "Data Integrity Check Failure",
      "condition": "data_validation_failures > 0",
      "metric_threshold": {
        "metric": "data_validation_failures",
        "operator": "greater_than",
        "value": 0,
        "duration_minutes": 1
      },
      "evaluation_window_minutes": 1,
      "auto_execute": true,
      "escalation_contacts": [
        "dba_team",
        "data_team"
      ]
    },
    {
      "trigger_id": "migration_progress_stalled",
      "name": "Migration Progress Stalled",
      "condition": "migration_progress unchanged for 30 minutes",
      "metric_threshold": {
        "metric": "migration_progress_rate",
        "operator": "equals",
        "value": 0,
        "duration_minutes": 30
      },
      "evaluation_window_minutes": 30,
      "auto_execute": false,
      "escalation_contacts": [
        "migration_team",
        "dba_team"
      ]
    }
  ],
  "data_recovery_plan": {
    "recovery_method": "point_in_time",
    "backup_location": "/backups/pre_migration_{migration_id}_{timestamp}.sql",
    "recovery_scripts": [
      "pg_restore -d production -c /backups/pre_migration_backup.sql",
      "SELECT pg_create_restore_point('rollback_point');",
      "VACUUM ANALYZE; -- Refresh statistics after restore"
    ],
    "data_validation_queries": [
      "SELECT COUNT(*) FROM critical_business_table;",
      "SELECT MAX(created_at) FROM audit_log;",
      "SELECT COUNT(DISTINCT user_id) FROM user_sessions;",
      "SELECT SUM(amount) FROM financial_transactions WHERE date = CURRENT_DATE;"
    ],
    "estimated_recovery_time_minutes": 45,
    "recovery_dependencies": [
      "database_instance_running",
      "backup_file_accessible"
    ]
  },
  "communication_templates": [
    {
      "template_type": "rollback_start",
      "audience": "technical",
      "subject": "ROLLBACK INITIATED: {migration_name}",
      "body": "Team,\n\nWe have initiated rollback for migration: {migration_name}\nRollback ID: {rollback_id}\nStart Time: {start_time}\nEstimated Duration: {estimated_duration}\n\nReason: {rollback_reason}\n\nCurrent Status: Rolling back phase {current_phase}\n\nNext Updates: Every 15 minutes or upon phase completion\n\nActions Required:\n- Monitor system health dashboards\n- Stand by for escalation if needed\n- Do not make manual changes during rollback\n\nIncident Commander: {incident_commander}\n",
      "urgency": "medium",
      "delivery_methods": [
        "email",
        "slack"
      ]
    },
    {
      "template_type": "rollback_start",
      "audience": "business",
      "subject": "System Rollback In Progress - {system_name}",
      "body": "Business Stakeholders,\n\nWe are currently performing a planned rollback of the {system_name} migration due to {rollback_reason}.\n\nImpact: {business_impact}\nExpected Resolution: {estimated_completion_time}\nAffected Services: {affected_services}\n\nWe will provide updates every 30 minutes.\n\nContact: {business_contact}\n",
      "urgency": "medium",
      "delivery_methods": [
        "email"
      ]
    },
    {
      "template_type": "rollback_start",
      "audience": "executive",
      "subject": "EXEC ALERT: Critical System Rollback - {system_name}",
      "body": "Executive Team,\n\nA critical rollback is in progress for {system_name}.\n\nSummary:\n- Rollback Reason: {rollback_reason}\n- Business Impact: {business_impact}\n- Expected Resolution: {estimated_completion_time}\n- Customer Impact: {customer_impact}\n\nWe are following established procedures and will update hourly.\n\nEscalation: {escalation_contact}\n",
      "urgency": "high",
      "delivery_methods": [
        "email"
      ]
    },
    {
      "template_type": "rollback_complete",
      "audience": "technical",
      "subject": "ROLLBACK COMPLETED: {migration_name}",
      "body": "Team,\n\nRollback has been successfully completed for migration: {migration_name}\n\nSummary:\n- Start Time: {start_time}\n- End Time: {end_time}\n- Duration: {actual_duration}\n- Phases Completed: {completed_phases}\n\nValidation Results:\n{validation_results}\n\nSystem Status: {system_status}\n\nNext Steps:\n- Continue monitoring for 24 hours\n- Post-rollback review scheduled for {review_date}\n- Root cause analysis to begin\n\nAll clear to resume normal operations.\n\nIncident Commander: {incident_commander}\n",
      "urgency": "medium",
      "delivery_methods": [
        "email",
        "slack"
      ]
    },
    {
      "template_type": "emergency_escalation",
      "audience": "executive",
      "subject": "CRITICAL: Rollback Emergency - {migration_name}",
      "body": "CRITICAL SITUATION - IMMEDIATE ATTENTION REQUIRED\n\nMigration: {migration_name}\nIssue: Rollback procedure has encountered critical failures\n\nCurrent Status: {current_status}\nFailed Components: {failed_components}\nBusiness Impact: {business_impact}\nCustomer Impact: {customer_impact}\n\nImmediate Actions:\n1. Emergency response team activated\n2. {emergency_action_1}\n3. {emergency_action_2}\n\nWar Room: {war_room_location}\nBridge Line: {conference_bridge}\n\nNext Update: {next_update_time}\n\nIncident Commander: {incident_commander}\nExecutive On-Call: {executive_on_call}\n",
      "urgency": "emergency",
      "delivery_methods": [
        "email",
        "sms",
        "phone_call"
      ]
    }
  ],
  "escalation_matrix": {
    "level_1": {
      "trigger": "Single component failure",
      "response_time_minutes": 5,
      "contacts": [
        "on_call_engineer",
        "migration_lead"
      ],
      "actions": [
        "Investigate issue",
        "Attempt automated remediation",
        "Monitor closely"
      ]
    },
    "level_2": {
      "trigger": "Multiple component failures or single critical failure",
      "response_time_minutes": 2,
      "contacts": [
        "senior_engineer",
        "team_lead",
        "devops_lead"
      ],
      "actions": [
        "Initiate rollback",
        "Establish war room",
        "Notify stakeholders"
      ]
    },
    "level_3": {
      "trigger": "System-wide failure or data corruption",
      "response_time_minutes": 1,
      "contacts": [
        "engineering_manager",
        "cto",
        "incident_commander"
      ],
      "actions": [
        "Emergency rollback",
        "All hands on deck",
        "Executive notification"
      ]
    },
    "emergency": {
      "trigger": "Business-critical failure with customer impact",
      "response_time_minutes": 0,
      "contacts": [
        "ceo",
        "cto",
        "head_of_operations"
      ],
      "actions": [
        "Emergency procedures",
        "Customer communication",
        "Media preparation if needed"
      ]
    }
  },
  "validation_checklist": [
    "Verify system is responding to health checks",
    "Confirm error rates are within normal parameters",
    "Validate response times meet SLA requirements",
    "Check all critical business processes are functioning",
    "Verify monitoring and alerting systems are operational",
    "Confirm no data corruption has occurred",
    "Validate security controls are functioning properly",
    "Check backup systems are working correctly",
    "Verify integration points with downstream systems",
    "Confirm user authentication and authorization working",
    "Validate database schema matches expected state",
    "Confirm referential integrity constraints",
    "Check database performance metrics",
    "Verify data consistency across related tables",
    "Validate indexes and statistics are optimal",
    "Confirm transaction logs are clean",
    "Check database connections and connection pooling"
  ],
  "post_rollback_procedures": [
    "Monitor system stability for 24-48 hours post-rollback",
    "Conduct thorough post-rollback testing of all critical paths",
    "Review and analyze rollback metrics and timing",
    "Document lessons learned and rollback procedure improvements",
    "Schedule post-mortem meeting with all stakeholders",
    "Update rollback procedures based on actual experience",
    "Communicate rollback completion to all stakeholders",
    "Archive rollback logs and artifacts for future reference",
    "Review and update monitoring thresholds if needed",
    "Plan for next migration attempt with improved procedures",
    "Conduct security review to ensure no vulnerabilities introduced",
    "Update disaster recovery procedures if affected by rollback",
    "Review capacity planning based on rollback resource usage",
    "Update documentation with rollback experience and timings"
  ],
  "emergency_contacts": [
    {
      "role": "Incident Commander",
      "name": "TBD - Assigned during migration",
      "primary_phone": "+1-XXX-XXX-XXXX",
      "email": "incident.commander@company.com",
      "backup_contact": "backup.commander@company.com"
    },
    {
      "role": "Technical Lead",
      "name": "TBD - Migration technical owner",
      "primary_phone": "+1-XXX-XXX-XXXX",
      "email": "tech.lead@company.com",
      "backup_contact": "senior.engineer@company.com"
    },
    {
      "role": "Business Owner",
      "name": "TBD - Business stakeholder",
      "primary_phone": "+1-XXX-XXX-XXXX",
      "email": "business.owner@company.com",
      "backup_contact": "product.manager@company.com"
    },
    {
      "role": "On-Call Engineer",
      "name": "Current on-call rotation",
      "primary_phone": "+1-XXX-XXX-XXXX",
      "email": "oncall@company.com",
      "backup_contact": "backup.oncall@company.com"
    },
    {
      "role": "Executive Escalation",
      "name": "CTO/VP Engineering",
      "primary_phone": "+1-XXX-XXX-XXXX",
      "email": "cto@company.com",
      "backup_contact": "vp.engineering@company.com"
    }
  ]
}

================================================================================
ROLLBACK RUNBOOK: rb_921c0bca
================================================================================
Migration ID: 23a52ed1507f
Created: 2026-02-16T13:47:31.108500

EMERGENCY CONTACTS
----------------------------------------
Incident Commander: TBD - Assigned during migration
  Phone: +1-XXX-XXX-XXXX
  Email: incident.commander@company.com
  Backup: backup.commander@company.com

Technical Lead: TBD - Migration technical owner
  Phone: +1-XXX-XXX-XXXX
  Email: tech.lead@company.com
  Backup: senior.engineer@company.com

Business Owner: TBD - Business stakeholder
  Phone: +1-XXX-XXX-XXXX
  Email: business.owner@company.com
  Backup: product.manager@company.com

On-Call Engineer: Current on-call rotation
  Phone: +1-XXX-XXX-XXXX
  Email: oncall@company.com
  Backup: backup.oncall@company.com

Executive Escalation: CTO/VP Engineering
  Phone: +1-XXX-XXX-XXXX
  Email: cto@company.com
  Backup: vp.engineering@company.com

ESCALATION MATRIX
----------------------------------------
LEVEL_1:
  Trigger: Single component failure
  Response Time: 5 minutes
  Contacts: on_call_engineer, migration_lead
  Actions: Investigate issue, Attempt automated remediation, Monitor closely

LEVEL_2:
  Trigger: Multiple component failures or single critical failure
  Response Time: 2 minutes
  Contacts: senior_engineer, team_lead, devops_lead
  Actions: Initiate rollback, Establish war room, Notify stakeholders

LEVEL_3:
  Trigger: System-wide failure or data corruption
  Response Time: 1 minutes
  Contacts: engineering_manager, cto, incident_commander
  Actions: Emergency rollback, All hands on deck, Executive notification

EMERGENCY:
  Trigger: Business-critical failure with customer impact
  Response Time: 0 minutes
  Contacts: ceo, cto, head_of_operations
  Actions: Emergency procedures, Customer communication, Media preparation if needed

AUTOMATIC ROLLBACK TRIGGERS
----------------------------------------
• Error Rate Spike
  Condition: error_rate > baseline * 5 for 5 minutes
  Auto-Execute: Yes
  Evaluation Window: 5 minutes
  Contacts: on_call_engineer, migration_lead

• Response Time Degradation
  Condition: p95_response_time > baseline * 3 for 10 minutes
  Auto-Execute: No
  Evaluation Window: 10 minutes
  Contacts: performance_team, migration_lead

• Service Availability Drop
  Condition: availability < 95% for 2 minutes
  Auto-Execute: Yes
  Evaluation Window: 2 minutes
  Contacts: sre_team, incident_commander

• Data Integrity Check Failure
  Condition: data_validation_failures > 0
  Auto-Execute: Yes
  Evaluation Window: 1 minutes
  Contacts: dba_team, data_team

• Migration Progress Stalled
  Condition: migration_progress unchanged for 30 minutes
  Auto-Execute: No
  Evaluation Window: 30 minutes
  Contacts: migration_team, dba_team

ROLLBACK PHASES
----------------------------------------
1. ROLLBACK_CLEANUP
   Description: Rollback changes made during cleanup phase
   Urgency: MEDIUM
   Duration: 570 minutes
   Risk Level: MEDIUM
   Prerequisites:
     ✓ Incident commander assigned and briefed
     ✓ All team members notified of rollback initiation
     ✓ Monitoring systems confirmed operational
     ✓ Backup systems verified and accessible
   Steps:
     99. Validate rollback completion
        Duration: 10 min
        Type: manual
        Success Criteria: cleanup fully rolled back, All validation checks pass

   Validation Checkpoints:
     ☐ cleanup rollback steps completed
     ☐ System health checks passing
     ☐ No critical errors in logs
     ☐ Key metrics within acceptable ranges
     ☐ Validation command passed: SELECT COUNT(*) FROM {table_name};...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH...

2. ROLLBACK_CONTRACT
   Description: Rollback changes made during contract phase
   Urgency: MEDIUM
   Duration: 570 minutes
   Risk Level: MEDIUM
   Prerequisites:
     ✓ Incident commander assigned and briefed
     ✓ All team members notified of rollback initiation
     ✓ Monitoring systems confirmed operational
     ✓ Backup systems verified and accessible
     ✓ Previous rollback phase completed successfully
   Steps:
     99. Validate rollback completion
        Duration: 10 min
        Type: manual
        Success Criteria: contract fully rolled back, All validation checks pass

   Validation Checkpoints:
     ☐ contract rollback steps completed
     ☐ System health checks passing
     ☐ No critical errors in logs
     ☐ Key metrics within acceptable ranges
     ☐ Validation command passed: SELECT COUNT(*) FROM {table_name};...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH...

3. ROLLBACK_MIGRATE
   Description: Rollback changes made during migrate phase
   Urgency: MEDIUM
   Duration: 570 minutes
   Risk Level: MEDIUM
   Prerequisites:
     ✓ Incident commander assigned and briefed
     ✓ All team members notified of rollback initiation
     ✓ Monitoring systems confirmed operational
     ✓ Backup systems verified and accessible
     ✓ Previous rollback phase completed successfully
   Steps:
     99. Validate rollback completion
        Duration: 10 min
        Type: manual
        Success Criteria: migrate fully rolled back, All validation checks pass

   Validation Checkpoints:
     ☐ migrate rollback steps completed
     ☐ System health checks passing
     ☐ No critical errors in logs
     ☐ Key metrics within acceptable ranges
     ☐ Validation command passed: SELECT COUNT(*) FROM {table_name};...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH...

4. ROLLBACK_EXPAND
   Description: Rollback changes made during expand phase
   Urgency: MEDIUM
   Duration: 570 minutes
   Risk Level: MEDIUM
   Prerequisites:
     ✓ Incident commander assigned and briefed
     ✓ All team members notified of rollback initiation
     ✓ Monitoring systems confirmed operational
     ✓ Backup systems verified and accessible
     ✓ Previous rollback phase completed successfully
   Steps:
     99. Validate rollback completion
        Duration: 10 min
        Type: manual
        Success Criteria: expand fully rolled back, All validation checks pass

   Validation Checkpoints:
     ☐ expand rollback steps completed
     ☐ System health checks passing
     ☐ No critical errors in logs
     ☐ Key metrics within acceptable ranges
     ☐ Validation command passed: SELECT COUNT(*) FROM {table_name};...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH...

5. ROLLBACK_PREPARATION
   Description: Rollback changes made during preparation phase
   Urgency: MEDIUM
   Duration: 570 minutes
   Risk Level: MEDIUM
   Prerequisites:
     ✓ Incident commander assigned and briefed
     ✓ All team members notified of rollback initiation
     ✓ Monitoring systems confirmed operational
     ✓ Backup systems verified and accessible
     ✓ Previous rollback phase completed successfully
   Steps:
     1. Drop migration artifacts
        Duration: 5 min
        Type: sql
        Script:
          -- Drop migration artifacts
          DROP TABLE IF EXISTS migration_log;
          DROP PROCEDURE IF EXISTS migrate_data();
        Success Criteria: No migration artifacts remain

     99. Validate rollback completion
        Duration: 10 min
        Type: manual
        Success Criteria: preparation fully rolled back, All validation checks pass

   Validation Checkpoints:
     ☐ preparation rollback steps completed
     ☐ System health checks passing
     ☐ No critical errors in logs
     ☐ Key metrics within acceptable ranges
     ☐ Validation command passed: SELECT COUNT(*) FROM {table_name};...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.tables WHE...
     ☐ Validation command passed: SELECT COUNT(*) FROM information_schema.columns WH...

DATA RECOVERY PLAN
----------------------------------------
Recovery Method: point_in_time
Backup Location: /backups/pre_migration_{migration_id}_{timestamp}.sql
Estimated Recovery Time: 45 minutes
Recovery Scripts:
  • pg_restore -d production -c /backups/pre_migration_backup.sql
  • SELECT pg_create_restore_point('rollback_point');
  • VACUUM ANALYZE; -- Refresh statistics after restore
Validation Queries:
  • SELECT COUNT(*) FROM critical_business_table;
  • SELECT MAX(created_at) FROM audit_log;
  • SELECT COUNT(DISTINCT user_id) FROM user_sessions;
  • SELECT SUM(amount) FROM financial_transactions WHERE date = CURRENT_DATE;

POST-ROLLBACK VALIDATION CHECKLIST
----------------------------------------
 1. ☐ Verify system is responding to health checks
 2. ☐ Confirm error rates are within normal parameters
 3. ☐ Validate response times meet SLA requirements
 4. ☐ Check all critical business processes are functioning
 5. ☐ Verify monitoring and alerting systems are operational
 6. ☐ Confirm no data corruption has occurred
 7. ☐ Validate security controls are functioning properly
 8. ☐ Check backup systems are working correctly
 9. ☐ Verify integration points with downstream systems
10. ☐ Confirm user authentication and authorization working
11. ☐ Validate database schema matches expected state
12. ☐ Confirm referential integrity constraints
13. ☐ Check database performance metrics
14. ☐ Verify data consistency across related tables
15. ☐ Validate indexes and statistics are optimal
16. ☐ Confirm transaction logs are clean
17. ☐ Check database connections and connection pooling

POST-ROLLBACK PROCEDURES
----------------------------------------
 1. Monitor system stability for 24-48 hours post-rollback
 2. Conduct thorough post-rollback testing of all critical paths
 3. Review and analyze rollback metrics and timing
 4. Document lessons learned and rollback procedure improvements
 5. Schedule post-mortem meeting with all stakeholders
 6. Update rollback procedures based on actual experience
 7. Communicate rollback completion to all stakeholders
 8. Archive rollback logs and artifacts for future reference
 9. Review and update monitoring thresholds if needed
10. Plan for next migration attempt with improved procedures
11. Conduct security review to ensure no vulnerabilities introduced
12. Update disaster recovery procedures if affected by rollback
13. Review capacity planning based on rollback resource usage
14. Update documentation with rollback experience and timings

{
  "migration_id": "23a52ed1507f",
  "source_system": "PostgreSQL 13 Production Database",
  "target_system": "PostgreSQL 15 Cloud Database",
  "migration_type": "database",
  "complexity": "critical",
  "estimated_duration_hours": 95,
  "phases": [
    {
      "name": "preparation",
      "description": "Prepare systems and teams for migration",
      "duration_hours": 19,
      "dependencies": [],
      "validation_criteria": [
        "All backups completed successfully",
        "Monitoring systems operational",
        "Team members briefed and ready",
        "Rollback procedures tested"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Backup source system",
        "Set up monitoring and alerting",
        "Prepare rollback procedures",
        "Communicate migration timeline",
        "Validate prerequisites"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "expand",
      "description": "Execute expand phase",
      "duration_hours": 19,
      "dependencies": [
        "preparation"
      ],
      "validation_criteria": [
        "Expand phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete expand activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "migrate",
      "description": "Execute migrate phase",
      "duration_hours": 19,
      "dependencies": [
        "expand"
      ],
      "validation_criteria": [
        "Migrate phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete migrate activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "contract",
      "description": "Execute contract phase",
      "duration_hours": 19,
      "dependencies": [
        "migrate"
      ],
      "validation_criteria": [
        "Contract phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete contract activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "cleanup",
      "description": "Execute cleanup phase",
      "duration_hours": 19,
      "dependencies": [
        "contract"
      ],
      "validation_criteria": [
        "Cleanup phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete cleanup activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    }
  ],
  "risks": [
    {
      "category": "technical",
      "description": "Data corruption during migration",
      "probability": "low",
      "impact": "critical",
      "severity": "high",
      "mitigation": "Implement comprehensive backup and validation procedures",
      "owner": "DBA Team"
    },
    {
      "category": "technical",
      "description": "Extended downtime due to migration complexity",
      "probability": "medium",
      "impact": "high",
      "severity": "high",
      "mitigation": "Use blue-green deployment and phased migration approach",
      "owner": "DevOps Team"
    },
    {
      "category": "business",
      "description": "Business process disruption",
      "probability": "medium",
      "impact": "high",
      "severity": "high",
      "mitigation": "Communicate timeline and provide alternate workflows",
      "owner": "Business Owner"
    },
    {
      "category": "operational",
      "description": "Insufficient rollback testing",
      "probability": "high",
      "impact": "critical",
      "severity": "critical",
      "mitigation": "Execute full rollback procedures in staging environment",
      "owner": "QA Team"
    },
    {
      "category": "business",
      "description": "Zero-downtime requirement increases complexity",
      "probability": "high",
      "impact": "medium",
      "severity": "high",
      "mitigation": "Implement blue-green deployment or rolling update strategy",
      "owner": "DevOps Team"
    },
    {
      "category": "compliance",
      "description": "Regulatory compliance requirements",
      "probability": "medium",
      "impact": "high",
      "severity": "high",
      "mitigation": "Ensure all compliance checks are integrated into migration process",
      "owner": "Compliance Team"
    }
  ],
  "success_criteria": [
    "All data successfully migrated with 100% integrity",
    "System performance meets or exceeds baseline",
    "All business processes functioning normally",
    "No critical security vulnerabilities introduced",
    "Stakeholder acceptance criteria met",
    "Documentation and runbooks updated"
  ],
  "rollback_plan": {
    "rollback_phases": [
      {
        "phase": "cleanup",
        "rollback_actions": [
          "Revert cleanup changes",
          "Restore pre-cleanup state",
          "Validate cleanup rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-cleanup state",
          "All cleanup changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 285
      },
      {
        "phase": "contract",
        "rollback_actions": [
          "Revert contract changes",
          "Restore pre-contract state",
          "Validate contract rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-contract state",
          "All contract changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 285
      },
      {
        "phase": "migrate",
        "rollback_actions": [
          "Revert migrate changes",
          "Restore pre-migrate state",
          "Validate migrate rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-migrate state",
          "All migrate changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 285
      },
      {
        "phase": "expand",
        "rollback_actions": [
          "Revert expand changes",
          "Restore pre-expand state",
          "Validate expand rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-expand state",
          "All expand changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 285
      },
      {
        "phase": "preparation",
        "rollback_actions": [
          "Revert preparation changes",
          "Restore pre-preparation state",
          "Validate preparation rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-preparation state",
          "All preparation changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 285
      }
    ],
    "rollback_triggers": [
      "Critical system failure",
      "Data corruption detected",
      "Migration timeline exceeded by > 50%",
      "Business-critical functionality unavailable",
      "Security breach detected",
      "Stakeholder decision to abort"
    ],
    "rollback_decision_matrix": {
      "low_severity": "Continue with monitoring",
      "medium_severity": "Assess and decide within 15 minutes",
      "high_severity": "Immediate rollback initiation",
      "critical_severity": "Emergency rollback - all hands"
    },
    "rollback_contacts": [
      "Migration Lead",
      "Technical Lead",
      "Business Owner",
      "On-call Engineer"
    ]
  },
  "stakeholders": [
    "Business Owner",
    "Technical Lead",
    "DevOps Team",
    "QA Team",
    "Security Team",
    "End Users"
  ],
  "created_at": "2026-02-16T13:47:23.704502"
}

================================================================================
MIGRATION PLAN: 23a52ed1507f
================================================================================
Source System: PostgreSQL 13 Production Database
Target System: PostgreSQL 15 Cloud Database
Migration Type: DATABASE
Complexity Level: CRITICAL
Estimated Duration: 95 hours (4.0 days)
Created: 2026-02-16T13:47:23.704502

MIGRATION PHASES
----------------------------------------
1. PREPARATION (19h)
   Description: Prepare systems and teams for migration
   Risk Level: MEDIUM
   Tasks:
     • Backup source system
     • Set up monitoring and alerting
     • Prepare rollback procedures
     • Communicate migration timeline
     • Validate prerequisites
   Success Criteria:
     ✓ All backups completed successfully
     ✓ Monitoring systems operational
     ✓ Team members briefed and ready
     ✓ Rollback procedures tested

2. EXPAND (19h)
   Description: Execute expand phase
   Risk Level: MEDIUM
   Dependencies: preparation
   Tasks:
     • Complete expand activities
   Success Criteria:
     ✓ Expand phase completed successfully

3. MIGRATE (19h)
   Description: Execute migrate phase
   Risk Level: MEDIUM
   Dependencies: expand
   Tasks:
     • Complete migrate activities
   Success Criteria:
     ✓ Migrate phase completed successfully

4. CONTRACT (19h)
   Description: Execute contract phase
   Risk Level: MEDIUM
   Dependencies: migrate
   Tasks:
     • Complete contract activities
   Success Criteria:
     ✓ Contract phase completed successfully

5. CLEANUP (19h)
   Description: Execute cleanup phase
   Risk Level: MEDIUM
   Dependencies: contract
   Tasks:
     • Complete cleanup activities
   Success Criteria:
     ✓ Cleanup phase completed successfully

RISK ASSESSMENT
----------------------------------------
CRITICAL SEVERITY RISKS:
  • Insufficient rollback testing
    Category: operational
    Probability: high | Impact: critical
    Mitigation: Execute full rollback procedures in staging environment
    Owner: QA Team

HIGH SEVERITY RISKS:
  • Data corruption during migration
    Category: technical
    Probability: low | Impact: critical
    Mitigation: Implement comprehensive backup and validation procedures
    Owner: DBA Team

  • Extended downtime due to migration complexity
    Category: technical
    Probability: medium | Impact: high
    Mitigation: Use blue-green deployment and phased migration approach
    Owner: DevOps Team

  • Business process disruption
    Category: business
    Probability: medium | Impact: high
    Mitigation: Communicate timeline and provide alternate workflows
    Owner: Business Owner

  • Zero-downtime requirement increases complexity
    Category: business
    Probability: high | Impact: medium
    Mitigation: Implement blue-green deployment or rolling update strategy
    Owner: DevOps Team

  • Regulatory compliance requirements
    Category: compliance
    Probability: medium | Impact: high
    Mitigation: Ensure all compliance checks are integrated into migration process
    Owner: Compliance Team

ROLLBACK STRATEGY
----------------------------------------
Rollback Triggers:
  • Critical system failure
  • Data corruption detected
  • Migration timeline exceeded by > 50%
  • Business-critical functionality unavailable
  • Security breach detected
  • Stakeholder decision to abort

Rollback Phases:
  CLEANUP:
    - Revert cleanup changes
    - Restore pre-cleanup state
    - Validate cleanup rollback success
    Estimated Time: 285 minutes

  CONTRACT:
    - Revert contract changes
    - Restore pre-contract state
    - Validate contract rollback success
    Estimated Time: 285 minutes

  MIGRATE:
    - Revert migrate changes
    - Restore pre-migrate state
    - Validate migrate rollback success
    Estimated Time: 285 minutes

  EXPAND:
    - Revert expand changes
    - Restore pre-expand state
    - Validate expand rollback success
    Estimated Time: 285 minutes

  PREPARATION:
    - Revert preparation changes
    - Restore pre-preparation state
    - Validate preparation rollback success
    Estimated Time: 285 minutes

SUCCESS CRITERIA
----------------------------------------
✓ All data successfully migrated with 100% integrity
✓ System performance meets or exceeds baseline
✓ All business processes functioning normally
✓ No critical security vulnerabilities introduced
✓ Stakeholder acceptance criteria met
✓ Documentation and runbooks updated

STAKEHOLDERS
----------------------------------------
• Business Owner
• Technical Lead
• DevOps Team
• QA Team
• Security Team
• End Users

{
  "migration_id": "21031930da18",
  "source_system": "Legacy User Service (Java Spring Boot 2.x)",
  "target_system": "New User Service (Node.js + TypeScript)",
  "migration_type": "service",
  "complexity": "critical",
  "estimated_duration_hours": 500,
  "phases": [
    {
      "name": "intercept",
      "description": "Execute intercept phase",
      "duration_hours": 100,
      "dependencies": [],
      "validation_criteria": [
        "Intercept phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete intercept activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "implement",
      "description": "Execute implement phase",
      "duration_hours": 100,
      "dependencies": [
        "intercept"
      ],
      "validation_criteria": [
        "Implement phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete implement activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "redirect",
      "description": "Execute redirect phase",
      "duration_hours": 100,
      "dependencies": [
        "implement"
      ],
      "validation_criteria": [
        "Redirect phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete redirect activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "validate",
      "description": "Execute validate phase",
      "duration_hours": 100,
      "dependencies": [
        "redirect"
      ],
      "validation_criteria": [
        "Validate phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete validate activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    },
    {
      "name": "retire",
      "description": "Execute retire phase",
      "duration_hours": 100,
      "dependencies": [
        "validate"
      ],
      "validation_criteria": [
        "Retire phase completed successfully"
      ],
      "rollback_triggers": [
        "Critical system failure",
        "Data corruption detected",
        "Performance degradation > 50%",
        "Business process failure"
      ],
      "tasks": [
        "Complete retire activities"
      ],
      "risk_level": "medium",
      "resources_required": [
        "Technical team availability",
        "System access and permissions",
        "Monitoring and alerting systems",
        "Communication channels"
      ]
    }
  ],
  "risks": [
    {
      "category": "technical",
      "description": "Service compatibility issues",
      "probability": "medium",
      "impact": "high",
      "severity": "high",
      "mitigation": "Implement comprehensive integration testing",
      "owner": "Development Team"
    },
    {
      "category": "technical",
      "description": "Performance degradation",
      "probability": "medium",
      "impact": "medium",
      "severity": "medium",
      "mitigation": "Conduct load testing and performance benchmarking",
      "owner": "DevOps Team"
    },
    {
      "category": "business",
      "description": "Feature parity gaps",
      "probability": "high",
      "impact": "high",
      "severity": "high",
      "mitigation": "Document feature mapping and acceptance criteria",
      "owner": "Product Owner"
    },
    {
      "category": "operational",
      "description": "Monitoring gap during transition",
      "probability": "medium",
      "impact": "medium",
      "severity": "medium",
      "mitigation": "Set up dual monitoring and alerting systems",
      "owner": "SRE Team"
    },
    {
      "category": "business",
      "description": "Zero-downtime requirement increases complexity",
      "probability": "high",
      "impact": "medium",
      "severity": "high",
      "mitigation": "Implement blue-green deployment or rolling update strategy",
      "owner": "DevOps Team"
    },
    {
      "category": "compliance",
      "description": "Regulatory compliance requirements",
      "probability": "medium",
      "impact": "high",
      "severity": "high",
      "mitigation": "Ensure all compliance checks are integrated into migration process",
      "owner": "Compliance Team"
    }
  ],
  "success_criteria": [
    "All data successfully migrated with 100% integrity",
    "System performance meets or exceeds baseline",
    "All business processes functioning normally",
    "No critical security vulnerabilities introduced",
    "Stakeholder acceptance criteria met",
    "Documentation and runbooks updated"
  ],
  "rollback_plan": {
    "rollback_phases": [
      {
        "phase": "retire",
        "rollback_actions": [
          "Revert retire changes",
          "Restore pre-retire state",
          "Validate retire rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-retire state",
          "All retire changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 1500
      },
      {
        "phase": "validate",
        "rollback_actions": [
          "Revert validate changes",
          "Restore pre-validate state",
          "Validate validate rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-validate state",
          "All validate changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 1500
      },
      {
        "phase": "redirect",
        "rollback_actions": [
          "Revert redirect changes",
          "Restore pre-redirect state",
          "Validate redirect rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-redirect state",
          "All redirect changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 1500
      },
      {
        "phase": "implement",
        "rollback_actions": [
          "Revert implement changes",
          "Restore pre-implement state",
          "Validate implement rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-implement state",
          "All implement changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 1500
      },
      {
        "phase": "intercept",
        "rollback_actions": [
          "Revert intercept changes",
          "Restore pre-intercept state",
          "Validate intercept rollback success"
        ],
        "validation_criteria": [
          "System restored to pre-intercept state",
          "All intercept changes successfully reverted",
          "System functionality confirmed"
        ],
        "estimated_time_minutes": 1500
      }
    ],
    "rollback_triggers": [
      "Critical system failure",
      "Data corruption detected",
      "Migration timeline exceeded by > 50%",
      "Business-critical functionality unavailable",
      "Security breach detected",
      "Stakeholder decision to abort"
    ],
    "rollback_decision_matrix": {
      "low_severity": "Continue with monitoring",
      "medium_severity": "Assess and decide within 15 minutes",
      "high_severity": "Immediate rollback initiation",
      "critical_severity": "Emergency rollback - all hands"
    },
    "rollback_contacts": [
      "Migration Lead",
      "Technical Lead",
      "Business Owner",
      "On-call Engineer"
    ]
  },
  "stakeholders": [
    "Business Owner",
    "Technical Lead",
    "DevOps Team",
    "QA Team",
    "Security Team",
    "End Users"
  ],
  "created_at": "2026-02-16T13:47:34.565896"
}