Initial commit

src/PowderCoating.Core/Entities/SupportingEntities.cs

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+using PowderCoating.Core.Enums;
+
+namespace PowderCoating.Core.Entities;
+
+public class Vendor : BaseEntity
+{
+    public string CompanyName { get; set; } = string.Empty;
+    public string? ContactName { get; set; }
+    public string? Email { get; set; }
+    public string? Phone { get; set; }
+    public string? Address { get; set; }
+    public string? City { get; set; }
+    public string? State { get; set; }
+    public string? ZipCode { get; set; }
+    public string? Country { get; set; } = "USA";
+
+    public string? Website { get; set; }
+
+    // Business Information
+    public string? AccountNumber { get; set; }
+    public string? TaxId { get; set; }
+    public string? PaymentTerms { get; set; }
+    public decimal? CreditLimit { get; set; }
+
+    public string? Notes { get; set; }
+    public bool IsActive { get; set; } = true;
+    public bool IsPreferred { get; set; } = false;
+
+    // Accounts Payable tracking
+    /// <summary>Running AP balance: increases with new bills, decreases with payments.</summary>
+    public decimal CurrentBalance { get; set; } = 0;
+    /// <summary>Balance owed at go-live (for migrating existing vendors).</summary>
+    public decimal OpeningBalance { get; set; } = 0;
+    public DateTime? OpeningBalanceDate { get; set; }
+    /// <summary>Default expense account pre-filled on new bill line items for this vendor.</summary>
+    public int? DefaultExpenseAccountId { get; set; }
+
+    // Navigation
+    public virtual ICollection<InventoryItem> InventoryItems { get; set; } = new List<InventoryItem>();
+    public virtual ICollection<Bill> Bills { get; set; } = new List<Bill>();
+    public virtual ICollection<BillPayment> BillPayments { get; set; } = new List<BillPayment>();
+    public virtual ICollection<Expense> Expenses { get; set; } = new List<Expense>();
+    public virtual Account? DefaultExpenseAccount { get; set; }
+}
+
+public class InventoryTransaction : BaseEntity
+{
+    public int InventoryItemId { get; set; }
+    public InventoryTransactionType TransactionType { get; set; }
+    public decimal Quantity { get; set; }
+    public decimal UnitCost { get; set; }
+    public decimal TotalCost { get; set; }
+    
+    public DateTime TransactionDate { get; set; } = DateTime.UtcNow;
+    
+    public string? Reference { get; set; } // PO number, Job number, etc.
+    public string? Notes { get; set; }
+
+    public decimal BalanceAfter { get; set; }
+
+    // Optional FK to the PO that generated this purchase transaction
+    public int? PurchaseOrderId { get; set; }
+    public virtual PurchaseOrder? PurchaseOrder { get; set; }
+
+    // Optional FK to the job this material was used on (set by QR scan / manual log)
+    public int? JobId { get; set; }
+    public virtual Job? Job { get; set; }
+
+    public virtual InventoryItem InventoryItem { get; set; } = null!;
+}
+
+public class JobPhoto : BaseEntity
+{
+    public int JobId { get; set; }
+    public virtual Job Job { get; set; } = null!;
+
+    /// <summary>
+    /// Relative path from media folder (e.g., "1/job-photos/5/1.jpg")
+    /// </summary>
+    public string FilePath { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Original filename when uploaded
+    /// </summary>
+    public string FileName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// File size in bytes
+    /// </summary>
+    public long FileSize { get; set; }
+
+    /// <summary>
+    /// Content type (e.g., "image/jpeg")
+    /// </summary>
+    public string ContentType { get; set; } = string.Empty;
+
+    /// <summary>
+    /// User-provided caption/note for the photo
+    /// </summary>
+    public string? Caption { get; set; }
+
+    /// <summary>
+    /// Type of photo (Before, After, Progress, QualityCheck, Issue, Completed)
+    /// </summary>
+    public JobPhotoType PhotoType { get; set; } = JobPhotoType.Progress;
+
+    /// <summary>
+    /// Display order for sorting photos
+    /// </summary>
+    public int DisplayOrder { get; set; }
+
+    /// <summary>
+    /// User who uploaded the photo
+    /// </summary>
+    public string UploadedById { get; set; } = string.Empty;
+    public virtual ApplicationUser? UploadedBy { get; set; }
+
+    public DateTime UploadedDate { get; set; } = DateTime.UtcNow;
+
+    /// <summary>
+    /// Comma-separated tags for this photo (e.g., colors used, finish type)
+    /// </summary>
+    public string? Tags { get; set; }
+
+    /// <summary>
+    /// True for photos copied from an AI quote analysis — excluded from subscription photo limits.
+    /// </summary>
+    public bool IsAiAnalysisPhoto { get; set; }
+}
+
+public class JobNote : BaseEntity
+{
+    public int JobId { get; set; }
+    public string Note { get; set; } = string.Empty;
+    public bool IsImportant { get; set; }
+    public bool IsInternal { get; set; } = true; // Don't show to customer
+    
+    public virtual Job Job { get; set; } = null!;
+}
+
+public class CustomerNote : BaseEntity
+{
+    public int CustomerId { get; set; }
+    public string Note { get; set; } = string.Empty;
+    public bool IsImportant { get; set; }
+    
+    public virtual Customer Customer { get; set; } = null!;
+}
+
+public class JobStatusHistory : BaseEntity
+{
+    public int JobId { get; set; }
+
+    // Lookup foreign keys (replacing enums)
+    public int FromStatusId { get; set; }
+    public int ToStatusId { get; set; }
+
+    public DateTime ChangedDate { get; set; } = DateTime.UtcNow;
+    public string? Notes { get; set; }
+
+    // Navigation properties
+    public virtual Job Job { get; set; } = null!;
+    public virtual JobStatusLookup FromStatus { get; set; } = null!;
+    public virtual JobStatusLookup ToStatus { get; set; } = null!;
+}
+
+public class PricingTier : BaseEntity
+{
+    public string TierName { get; set; } = string.Empty;
+    public string? Description { get; set; }
+    public decimal DiscountPercent { get; set; }
+    public bool IsActive { get; set; } = true;
+    
+    public virtual ICollection<Customer> Customers { get; set; } = new List<Customer>();
+}