bakery-ia/services/production/app/models/production.py

# ================================================================
# services/production/app/models/production.py
# ================================================================
"""
Production models for the production service
"""

from sqlalchemy import Column, String, Integer, Float, DateTime, Boolean, Text, JSON, Enum as SQLEnum
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import deferred
from sqlalchemy.sql import func
from datetime import datetime, timezone
from typing import Dict, Any, Optional
import uuid
import enum

from shared.database.base import Base


class ProductionStatus(str, enum.Enum):
    """Production batch status enumeration"""
    PENDING = "PENDING"
    IN_PROGRESS = "IN_PROGRESS"
    COMPLETED = "COMPLETED"
    CANCELLED = "CANCELLED"
    ON_HOLD = "ON_HOLD"
    QUALITY_CHECK = "QUALITY_CHECK"
    FAILED = "FAILED"


class ProductionPriority(str, enum.Enum):
    """Production priority levels"""
    LOW = "LOW"
    MEDIUM = "MEDIUM"
    HIGH = "HIGH"
    URGENT = "URGENT"


class EquipmentStatus(str, enum.Enum):
    """Equipment status enumeration"""
    OPERATIONAL = "operational"
    MAINTENANCE = "maintenance"
    DOWN = "down"
    WARNING = "warning"


class ProcessStage(str, enum.Enum):
    """Production process stages where quality checks can occur"""
    MIXING = "mixing"
    PROOFING = "proofing"
    SHAPING = "shaping"
    BAKING = "baking"
    COOLING = "cooling"
    PACKAGING = "packaging"
    FINISHING = "finishing"


class EquipmentType(str, enum.Enum):
    """Equipment type enumeration"""
    OVEN = "oven"
    MIXER = "mixer"
    PROOFER = "proofer"
    FREEZER = "freezer"
    PACKAGING = "packaging"
    OTHER = "other"


class ProductionBatch(Base):
    """Production batch model for tracking individual production runs"""
    __tablename__ = "production_batches"
    
    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    batch_number = Column(String(50), nullable=False, unique=True, index=True)
    
    # Product and recipe information
    product_id = Column(UUID(as_uuid=True), nullable=False, index=True)  # Reference to inventory/recipes
    product_name = Column(String(255), nullable=False)
    recipe_id = Column(UUID(as_uuid=True), nullable=True)
    
    # Production planning
    planned_start_time = Column(DateTime(timezone=True), nullable=False)
    planned_end_time = Column(DateTime(timezone=True), nullable=False)
    planned_quantity = Column(Float, nullable=False)
    planned_duration_minutes = Column(Integer, nullable=False)

    # Actual production tracking
    actual_start_time = Column(DateTime(timezone=True), nullable=True)
    actual_end_time = Column(DateTime(timezone=True), nullable=True)
    actual_quantity = Column(Float, nullable=True)
    actual_duration_minutes = Column(Integer, nullable=True)

    # Status and priority
    status = Column(SQLEnum(ProductionStatus), nullable=False, default=ProductionStatus.PENDING, index=True)
    priority = Column(SQLEnum(ProductionPriority), nullable=False, default=ProductionPriority.MEDIUM)

    # Process stage tracking
    current_process_stage = Column(SQLEnum(ProcessStage), nullable=True, index=True)
    process_stage_history = Column(JSON, nullable=True)  # Track stage transitions with timestamps
    pending_quality_checks = Column(JSON, nullable=True)  # Required quality checks for current stage
    completed_quality_checks = Column(JSON, nullable=True)  # Completed quality checks by stage
    
    # Cost tracking
    estimated_cost = Column(Float, nullable=True)
    actual_cost = Column(Float, nullable=True)
    labor_cost = Column(Float, nullable=True)
    material_cost = Column(Float, nullable=True)
    overhead_cost = Column(Float, nullable=True)
    
    # Quality metrics
    yield_percentage = Column(Float, nullable=True)  # actual/planned quantity
    quality_score = Column(Float, nullable=True)
    waste_quantity = Column(Float, nullable=True)
    defect_quantity = Column(Float, nullable=True)
    waste_defect_type = Column(String(100), nullable=True)  # Type of defect causing waste (burnt, misshapen, underproofed, temperature_issues, expired)
    
    # Equipment and resources
    equipment_used = Column(JSON, nullable=True)  # List of equipment IDs
    staff_assigned = Column(JSON, nullable=True)  # List of staff IDs
    station_id = Column(String(50), nullable=True)
    
    # Business context
    order_id = Column(UUID(as_uuid=True), nullable=True)  # Associated customer order
    forecast_id = Column(UUID(as_uuid=True), nullable=True)  # Associated demand forecast
    is_rush_order = Column(Boolean, default=False)
    is_special_recipe = Column(Boolean, default=False)
    is_ai_assisted = Column(Boolean, default=False)  # Whether batch used AI forecasting/optimization
    
    # Notes and tracking
    production_notes = Column(Text, nullable=True)
    quality_notes = Column(Text, nullable=True)
    delay_reason = Column(String(255), nullable=True)
    cancellation_reason = Column(String(255), nullable=True)

    # JTBD Dashboard: Reasoning and context for user transparency
    # Deferred loading to prevent breaking queries when columns don't exist yet
    reasoning = deferred(Column(Text, nullable=True))  # Why this batch was scheduled (e.g., "Based on wedding order #1234")
    reasoning_data = deferred(Column(JSON, nullable=True))  # Structured reasoning data
    # reasoning_data structure: {
    #   "trigger": "forecast" | "order" | "inventory" | "manual",
    #   "forecast_id": "uuid",
    #   "orders_fulfilled": [{"id": "uuid", "customer": "Maria's Bakery", "quantity": 100}],
    #   "demand_score": 0-100,
    #   "scheduling_priority_reason": "High demand + VIP customer"
    # }

    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    completed_at = Column(DateTime(timezone=True), nullable=True)
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "batch_number": self.batch_number,
            "product_id": str(self.product_id),
            "product_name": self.product_name,
            "recipe_id": str(self.recipe_id) if self.recipe_id else None,
            "planned_start_time": self.planned_start_time.isoformat() if self.planned_start_time else None,
            "planned_end_time": self.planned_end_time.isoformat() if self.planned_end_time else None,
            "planned_quantity": self.planned_quantity,
            "planned_duration_minutes": self.planned_duration_minutes,
            "actual_start_time": self.actual_start_time.isoformat() if self.actual_start_time else None,
            "actual_end_time": self.actual_end_time.isoformat() if self.actual_end_time else None,
            "actual_quantity": self.actual_quantity,
            "actual_duration_minutes": self.actual_duration_minutes,
            "status": self.status.value if self.status else None,
            "priority": self.priority.value if self.priority else None,
            "estimated_cost": self.estimated_cost,
            "actual_cost": self.actual_cost,
            "labor_cost": self.labor_cost,
            "material_cost": self.material_cost,
            "overhead_cost": self.overhead_cost,
            "yield_percentage": self.yield_percentage,
            "quality_score": self.quality_score,
            "waste_quantity": self.waste_quantity,
            "defect_quantity": self.defect_quantity,
            "waste_defect_type": self.waste_defect_type,
            "equipment_used": self.equipment_used,
            "staff_assigned": self.staff_assigned,
            "station_id": self.station_id,
            "order_id": str(self.order_id) if self.order_id else None,
            "forecast_id": str(self.forecast_id) if self.forecast_id else None,
            "is_rush_order": self.is_rush_order,
            "is_special_recipe": self.is_special_recipe,
            "is_ai_assisted": self.is_ai_assisted,
            "production_notes": self.production_notes,
            "quality_notes": self.quality_notes,
            "delay_reason": self.delay_reason,
            "cancellation_reason": self.cancellation_reason,
            "reasoning": self.reasoning,
            "reasoning_data": self.reasoning_data,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
            "completed_at": self.completed_at.isoformat() if self.completed_at else None,
        }


class ProductionSchedule(Base):
    """Production schedule model for planning and tracking daily production"""
    __tablename__ = "production_schedules"
    
    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    
    # Schedule information
    schedule_date = Column(DateTime(timezone=True), nullable=False, index=True)
    shift_start = Column(DateTime(timezone=True), nullable=False)
    shift_end = Column(DateTime(timezone=True), nullable=False)
    
    # Capacity planning
    total_capacity_hours = Column(Float, nullable=False)
    planned_capacity_hours = Column(Float, nullable=False)
    actual_capacity_hours = Column(Float, nullable=True)
    overtime_hours = Column(Float, nullable=True, default=0.0)
    
    # Staff and equipment
    staff_count = Column(Integer, nullable=False)
    equipment_capacity = Column(JSON, nullable=True)  # Equipment availability
    station_assignments = Column(JSON, nullable=True)  # Station schedules
    
    # Production metrics
    total_batches_planned = Column(Integer, nullable=False, default=0)
    total_batches_completed = Column(Integer, nullable=True, default=0)
    total_quantity_planned = Column(Float, nullable=False, default=0.0)
    total_quantity_produced = Column(Float, nullable=True, default=0.0)
    
    # Status tracking
    is_finalized = Column(Boolean, default=False)
    is_active = Column(Boolean, default=True)
    
    # Performance metrics
    efficiency_percentage = Column(Float, nullable=True)
    utilization_percentage = Column(Float, nullable=True)
    on_time_completion_rate = Column(Float, nullable=True)
    
    # Notes and adjustments
    schedule_notes = Column(Text, nullable=True)
    schedule_adjustments = Column(JSON, nullable=True)  # Track changes made
    
    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    finalized_at = Column(DateTime(timezone=True), nullable=True)
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "schedule_date": self.schedule_date.isoformat() if self.schedule_date else None,
            "shift_start": self.shift_start.isoformat() if self.shift_start else None,
            "shift_end": self.shift_end.isoformat() if self.shift_end else None,
            "total_capacity_hours": self.total_capacity_hours,
            "planned_capacity_hours": self.planned_capacity_hours,
            "actual_capacity_hours": self.actual_capacity_hours,
            "overtime_hours": self.overtime_hours,
            "staff_count": self.staff_count,
            "equipment_capacity": self.equipment_capacity,
            "station_assignments": self.station_assignments,
            "total_batches_planned": self.total_batches_planned,
            "total_batches_completed": self.total_batches_completed,
            "total_quantity_planned": self.total_quantity_planned,
            "total_quantity_produced": self.total_quantity_produced,
            "is_finalized": self.is_finalized,
            "is_active": self.is_active,
            "efficiency_percentage": self.efficiency_percentage,
            "utilization_percentage": self.utilization_percentage,
            "on_time_completion_rate": self.on_time_completion_rate,
            "schedule_notes": self.schedule_notes,
            "schedule_adjustments": self.schedule_adjustments,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
            "finalized_at": self.finalized_at.isoformat() if self.finalized_at else None,
        }


class ProductionCapacity(Base):
    """Production capacity model for tracking equipment and resource availability"""
    __tablename__ = "production_capacity"
    
    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    
    # Capacity definition
    resource_type = Column(String(50), nullable=False)  # equipment, staff, station
    resource_id = Column(String(100), nullable=False)
    resource_name = Column(String(255), nullable=False)
    
    # Time period
    date = Column(DateTime(timezone=True), nullable=False, index=True)
    start_time = Column(DateTime(timezone=True), nullable=False)
    end_time = Column(DateTime(timezone=True), nullable=False)
    
    # Capacity metrics
    total_capacity_units = Column(Float, nullable=False)  # Total available capacity
    allocated_capacity_units = Column(Float, nullable=False, default=0.0)
    remaining_capacity_units = Column(Float, nullable=False)
    
    # Status
    is_available = Column(Boolean, default=True)
    is_maintenance = Column(Boolean, default=False)
    is_reserved = Column(Boolean, default=False)
    
    # Equipment specific
    equipment_type = Column(String(100), nullable=True)
    max_batch_size = Column(Float, nullable=True)
    min_batch_size = Column(Float, nullable=True)
    setup_time_minutes = Column(Integer, nullable=True)
    cleanup_time_minutes = Column(Integer, nullable=True)
    
    # Performance tracking
    efficiency_rating = Column(Float, nullable=True)
    maintenance_status = Column(String(50), nullable=True)
    last_maintenance_date = Column(DateTime(timezone=True), nullable=True)
    
    # Notes
    notes = Column(Text, nullable=True)
    restrictions = Column(JSON, nullable=True)  # Product type restrictions, etc.
    
    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "resource_type": self.resource_type,
            "resource_id": self.resource_id,
            "resource_name": self.resource_name,
            "date": self.date.isoformat() if self.date else None,
            "start_time": self.start_time.isoformat() if self.start_time else None,
            "end_time": self.end_time.isoformat() if self.end_time else None,
            "total_capacity_units": self.total_capacity_units,
            "allocated_capacity_units": self.allocated_capacity_units,
            "remaining_capacity_units": self.remaining_capacity_units,
            "is_available": self.is_available,
            "is_maintenance": self.is_maintenance,
            "is_reserved": self.is_reserved,
            "equipment_type": self.equipment_type,
            "max_batch_size": self.max_batch_size,
            "min_batch_size": self.min_batch_size,
            "setup_time_minutes": self.setup_time_minutes,
            "cleanup_time_minutes": self.cleanup_time_minutes,
            "efficiency_rating": self.efficiency_rating,
            "maintenance_status": self.maintenance_status,
            "last_maintenance_date": self.last_maintenance_date.isoformat() if self.last_maintenance_date else None,
            "notes": self.notes,
            "restrictions": self.restrictions,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
        }


class QualityCheckTemplate(Base):
    """Quality check templates for tenant-specific quality standards"""
    __tablename__ = "quality_check_templates"

    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)

    # Template identification
    name = Column(String(255), nullable=False)
    template_code = Column(String(100), nullable=True, index=True)
    check_type = Column(String(50), nullable=False)  # visual, measurement, temperature, weight, boolean
    category = Column(String(100), nullable=True)  # appearance, structure, texture, etc.

    # Template configuration
    description = Column(Text, nullable=True)
    instructions = Column(Text, nullable=True)
    parameters = Column(JSON, nullable=True)  # Dynamic check parameters
    thresholds = Column(JSON, nullable=True)  # Pass/fail criteria
    scoring_criteria = Column(JSON, nullable=True)  # Scoring methodology

    # Configurability settings
    is_active = Column(Boolean, default=True)
    is_required = Column(Boolean, default=False)
    is_critical = Column(Boolean, default=False)  # Critical failures block production
    weight = Column(Float, default=1.0)  # Weight in overall quality score

    # Measurement specifications
    min_value = Column(Float, nullable=True)
    max_value = Column(Float, nullable=True)
    target_value = Column(Float, nullable=True)
    unit = Column(String(20), nullable=True)
    tolerance_percentage = Column(Float, nullable=True)

    # Process stage applicability
    applicable_stages = Column(JSON, nullable=True)  # List of ProcessStage values

    # Metadata
    created_by = Column(UUID(as_uuid=True), nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "name": self.name,
            "template_code": self.template_code,
            "check_type": self.check_type,
            "category": self.category,
            "description": self.description,
            "instructions": self.instructions,
            "parameters": self.parameters,
            "thresholds": self.thresholds,
            "scoring_criteria": self.scoring_criteria,
            "is_active": self.is_active,
            "is_required": self.is_required,
            "is_critical": self.is_critical,
            "weight": self.weight,
            "min_value": self.min_value,
            "max_value": self.max_value,
            "target_value": self.target_value,
            "unit": self.unit,
            "tolerance_percentage": self.tolerance_percentage,
            "applicable_stages": self.applicable_stages,
            "created_by": str(self.created_by),
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
        }


class QualityCheck(Base):
    """Quality check model for tracking production quality metrics with stage support"""
    __tablename__ = "quality_checks"

    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    batch_id = Column(UUID(as_uuid=True), nullable=False, index=True)  # FK to ProductionBatch
    template_id = Column(UUID(as_uuid=True), nullable=True, index=True)  # FK to QualityCheckTemplate

    # Check information
    check_type = Column(String(50), nullable=False)  # visual, weight, temperature, etc.
    process_stage = Column(SQLEnum(ProcessStage), nullable=True, index=True)  # Stage when check was performed
    check_time = Column(DateTime(timezone=True), nullable=False)
    checker_id = Column(String(100), nullable=True)  # Staff member who performed check

    # Quality metrics
    quality_score = Column(Float, nullable=False)  # 1-10 scale
    pass_fail = Column(Boolean, nullable=False)
    defect_count = Column(Integer, nullable=False, default=0)
    defect_types = Column(JSON, nullable=True)  # List of defect categories

    # Measurements
    measured_weight = Column(Float, nullable=True)
    measured_temperature = Column(Float, nullable=True)
    measured_moisture = Column(Float, nullable=True)
    measured_dimensions = Column(JSON, nullable=True)
    stage_specific_data = Column(JSON, nullable=True)  # Stage-specific measurements

    # Standards comparison
    target_weight = Column(Float, nullable=True)
    target_temperature = Column(Float, nullable=True)
    target_moisture = Column(Float, nullable=True)
    tolerance_percentage = Column(Float, nullable=True)

    # Results
    within_tolerance = Column(Boolean, nullable=True)
    corrective_action_needed = Column(Boolean, default=False)
    corrective_actions = Column(JSON, nullable=True)

    # Template-based results
    template_results = Column(JSON, nullable=True)  # Results from template-based checks
    criteria_scores = Column(JSON, nullable=True)  # Individual criteria scores

    # Notes and documentation
    check_notes = Column(Text, nullable=True)
    photos_urls = Column(JSON, nullable=True)  # URLs to quality check photos
    certificate_url = Column(String(500), nullable=True)

    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "batch_id": str(self.batch_id),
            "check_type": self.check_type,
            "check_time": self.check_time.isoformat() if self.check_time else None,
            "checker_id": self.checker_id,
            "quality_score": self.quality_score,
            "pass_fail": self.pass_fail,
            "defect_count": self.defect_count,
            "defect_types": self.defect_types,
            "measured_weight": self.measured_weight,
            "measured_temperature": self.measured_temperature,
            "measured_moisture": self.measured_moisture,
            "measured_dimensions": self.measured_dimensions,
            "target_weight": self.target_weight,
            "target_temperature": self.target_temperature,
            "target_moisture": self.target_moisture,
            "tolerance_percentage": self.tolerance_percentage,
            "within_tolerance": self.within_tolerance,
            "corrective_action_needed": self.corrective_action_needed,
            "corrective_actions": self.corrective_actions,
            "check_notes": self.check_notes,
            "photos_urls": self.photos_urls,
            "certificate_url": self.certificate_url,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
        }


class Equipment(Base):
    """Equipment model for tracking production equipment"""
    __tablename__ = "equipment"
    
    # Primary identification
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    tenant_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    
    # Equipment identification
    name = Column(String(255), nullable=False)
    type = Column(SQLEnum(EquipmentType), nullable=False)
    model = Column(String(100), nullable=True)
    serial_number = Column(String(100), nullable=True)
    location = Column(String(255), nullable=True)
    
    # Status tracking
    status = Column(SQLEnum(EquipmentStatus), nullable=False, default=EquipmentStatus.OPERATIONAL)
    
    # Dates
    install_date = Column(DateTime(timezone=True), nullable=True)
    last_maintenance_date = Column(DateTime(timezone=True), nullable=True)
    next_maintenance_date = Column(DateTime(timezone=True), nullable=True)
    maintenance_interval_days = Column(Integer, nullable=True)  # Maintenance interval in days
    
    # Performance metrics
    efficiency_percentage = Column(Float, nullable=True)  # Current efficiency
    uptime_percentage = Column(Float, nullable=True)  # Overall equipment effectiveness
    energy_usage_kwh = Column(Float, nullable=True)  # Current energy usage
    
    # Specifications
    power_kw = Column(Float, nullable=True)  # Power in kilowatts
    capacity = Column(Float, nullable=True)  # Capacity (units depend on equipment type)
    weight_kg = Column(Float, nullable=True)  # Weight in kilograms
    
    # Temperature monitoring
    current_temperature = Column(Float, nullable=True)  # Current temperature reading
    target_temperature = Column(Float, nullable=True)  # Target temperature
    
    # Status
    is_active = Column(Boolean, default=True)
    
    # Notes
    notes = Column(Text, nullable=True)
    
    # Timestamps
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary following shared pattern"""
        return {
            "id": str(self.id),
            "tenant_id": str(self.tenant_id),
            "name": self.name,
            "type": self.type.value if self.type else None,
            "model": self.model,
            "serial_number": self.serial_number,
            "location": self.location,
            "status": self.status.value if self.status else None,
            "install_date": self.install_date.isoformat() if self.install_date else None,
            "last_maintenance_date": self.last_maintenance_date.isoformat() if self.last_maintenance_date else None,
            "next_maintenance_date": self.next_maintenance_date.isoformat() if self.next_maintenance_date else None,
            "maintenance_interval_days": self.maintenance_interval_days,
            "efficiency_percentage": self.efficiency_percentage,
            "uptime_percentage": self.uptime_percentage,
            "energy_usage_kwh": self.energy_usage_kwh,
            "power_kw": self.power_kw,
            "capacity": self.capacity,
            "weight_kg": self.weight_kg,
            "current_temperature": self.current_temperature,
            "target_temperature": self.target_temperature,
            "is_active": self.is_active,
            "notes": self.notes,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
        }