update database

lib/features/projects/domain/entities/design_request.dart

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+/// Domain Entity: Design Request
+///
+/// Represents a request for design consultation service.
+library;
+
+import 'project_submission.dart';
+
+/// Design status enum
+enum DesignStatus {
+  /// Request submitted, pending assignment
+  pending,
+
+  /// Assigned to designer
+  assigned,
+
+  /// Design in progress
+  inProgress,
+
+  /// Design completed
+  completed,
+
+  /// Request cancelled
+  cancelled;
+
+  /// Get display name for status
+  String get displayName {
+    switch (this) {
+      case DesignStatus.pending:
+        return 'Pending';
+      case DesignStatus.assigned:
+        return 'Assigned';
+      case DesignStatus.inProgress:
+        return 'In Progress';
+      case DesignStatus.completed:
+        return 'Completed';
+      case DesignStatus.cancelled:
+        return 'Cancelled';
+    }
+  }
+}
+
+/// Design Request Entity
+///
+/// Contains information about a design consultation request:
+/// - Project requirements
+/// - Design preferences
+/// - Budget constraints
+/// - Assignment and tracking
+class DesignRequest {
+  /// Unique request identifier
+  final String requestId;
+
+  /// User ID who requested
+  final String userId;
+
+  /// Project name
+  final String projectName;
+
+  /// Project type
+  final ProjectType projectType;
+
+  /// Project area (square meters)
+  final double area;
+
+  /// Design style preference
+  final String? style;
+
+  /// Budget for design/construction
+  final double? budget;
+
+  /// Current situation description
+  final String? currentSituation;
+
+  /// Requirements and wishes
+  final String? requirements;
+
+  /// Additional notes
+  final String? notes;
+
+  /// Attachment URLs (photos, references)
+  final List<String> attachments;
+
+  /// Request status
+  final DesignStatus status;
+
+  /// Assigned designer name
+  final String? assignedDesigner;
+
+  /// Final design link/URL
+  final String? finalDesignLink;
+
+  /// User feedback
+  final String? feedback;
+
+  /// User rating (1-5)
+  final int? rating;
+
+  /// Estimated completion date
+  final DateTime? estimatedCompletion;
+
+  /// Request creation timestamp
+  final DateTime createdAt;
+
+  /// Completion timestamp
+  final DateTime? completedAt;
+
+  /// Last update timestamp
+  final DateTime updatedAt;
+
+  const DesignRequest({
+    required this.requestId,
+    required this.userId,
+    required this.projectName,
+    required this.projectType,
+    required this.area,
+    this.style,
+    this.budget,
+    this.currentSituation,
+    this.requirements,
+    this.notes,
+    required this.attachments,
+    required this.status,
+    this.assignedDesigner,
+    this.finalDesignLink,
+    this.feedback,
+    this.rating,
+    this.estimatedCompletion,
+    required this.createdAt,
+    this.completedAt,
+    required this.updatedAt,
+  });
+
+  /// Check if request is pending
+  bool get isPending => status == DesignStatus.pending;
+
+  /// Check if request is assigned
+  bool get isAssigned =>
+      status == DesignStatus.assigned || status == DesignStatus.inProgress;
+
+  /// Check if request is in progress
+  bool get isInProgress => status == DesignStatus.inProgress;
+
+  /// Check if request is completed
+  bool get isCompleted => status == DesignStatus.completed;
+
+  /// Check if request is cancelled
+  bool get isCancelled => status == DesignStatus.cancelled;
+
+  /// Check if request has attachments
+  bool get hasAttachments => attachments.isNotEmpty;
+
+  /// Check if design is ready
+  bool get hasDesign =>
+      finalDesignLink != null && finalDesignLink!.isNotEmpty;
+
+  /// Check if user has provided feedback
+  bool get hasFeedback => feedback != null || rating != null;
+
+  /// Get completion duration
+  Duration? get completionDuration {
+    if (completedAt == null) return null;
+    return completedAt!.difference(createdAt);
+  }
+
+  /// Check if overdue
+  bool get isOverdue {
+    if (estimatedCompletion == null || isCompleted || isCancelled) {
+      return false;
+    }
+    return DateTime.now().isAfter(estimatedCompletion!);
+  }
+
+  /// Copy with method for immutability
+  DesignRequest copyWith({
+    String? requestId,
+    String? userId,
+    String? projectName,
+    ProjectType? projectType,
+    double? area,
+    String? style,
+    double? budget,
+    String? currentSituation,
+    String? requirements,
+    String? notes,
+    List<String>? attachments,
+    DesignStatus? status,
+    String? assignedDesigner,
+    String? finalDesignLink,
+    String? feedback,
+    int? rating,
+    DateTime? estimatedCompletion,
+    DateTime? createdAt,
+    DateTime? completedAt,
+    DateTime? updatedAt,
+  }) {
+    return DesignRequest(
+      requestId: requestId ?? this.requestId,
+      userId: userId ?? this.userId,
+      projectName: projectName ?? this.projectName,
+      projectType: projectType ?? this.projectType,
+      area: area ?? this.area,
+      style: style ?? this.style,
+      budget: budget ?? this.budget,
+      currentSituation: currentSituation ?? this.currentSituation,
+      requirements: requirements ?? this.requirements,
+      notes: notes ?? this.notes,
+      attachments: attachments ?? this.attachments,
+      status: status ?? this.status,
+      assignedDesigner: assignedDesigner ?? this.assignedDesigner,
+      finalDesignLink: finalDesignLink ?? this.finalDesignLink,
+      feedback: feedback ?? this.feedback,
+      rating: rating ?? this.rating,
+      estimatedCompletion: estimatedCompletion ?? this.estimatedCompletion,
+      createdAt: createdAt ?? this.createdAt,
+      completedAt: completedAt ?? this.completedAt,
+      updatedAt: updatedAt ?? this.updatedAt,
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is DesignRequest &&
+        other.requestId == requestId &&
+        other.userId == userId &&
+        other.projectName == projectName &&
+        other.area == area &&
+        other.status == status;
+  }
+
+  @override
+  int get hashCode {
+    return Object.hash(
+      requestId,
+      userId,
+      projectName,
+      area,
+      status,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'DesignRequest(requestId: $requestId, projectName: $projectName, '
+        'projectType: $projectType, area: $area, status: $status, '
+        'assignedDesigner: $assignedDesigner)';
+  }
+}