diff --git a/Distribution/Migrations/20260916083241_AddOrderInvoiceLifecycle.cs b/Distribution/Migrations/20260916083241_AddOrderInvoiceLifecycle.cs
new file mode 100644
index 0000000..bee5750
--- /dev/null
+++ b/Distribution/Migrations/20260916083241_AddOrderInvoiceLifecycle.cs
@@ -0,0 +1,306 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+#pragma warning disable CA1814 // Prefer jagged arrays over multidimensional
+
+namespace Distribution.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddOrderInvoiceLifecycle : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // Must run before DropPrimaryKey below: OrderItems.FK_OrderId has a foreign key to
+            // Orders, and MySQL requires a supporting index on that column at all times. The old
+            // composite PK (FK_OrderId, FK_ItemId) was providing that support; without this index
+            // created first, dropping the PK leaves FK_OrderId's constraint without an index and
+            // MySQL rejects the DROP PRIMARY KEY (errno 150).
+            migrationBuilder.CreateIndex(
+                name: "IX_OrderItems_FK_OrderId",
+                table: "OrderItems",
+                column: "FK_OrderId");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_OrderItems",
+                table: "OrderItems");
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumns: new[] { "FK_ItemId", "FK_OrderId" },
+                keyValues: new object[] { new Guid("23000000-0000-0000-0000-000000000001"), new Guid("33000000-0000-0000-0000-000000000001") });
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumns: new[] { "FK_ItemId", "FK_OrderId" },
+                keyValues: new object[] { new Guid("23000000-0000-0000-0000-000000000003"), new Guid("33000000-0000-0000-0000-000000000001") });
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumns: new[] { "FK_ItemId", "FK_OrderId" },
+                keyValues: new object[] { new Guid("23000000-0000-0000-0000-000000000002"), new Guid("33000000-0000-0000-0000-000000000002") });
+
+            migrationBuilder.AlterColumn<Guid>(
+                name: "FK_SaleId",
+                table: "Orders",
+                type: "char(36)",
+                nullable: true,
+                collation: "ascii_general_ci",
+                oldClrType: typeof(Guid),
+                oldType: "char(36)")
+                .OldAnnotation("Relational:Collation", "ascii_general_ci");
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "ConfirmedAt",
+                table: "Orders",
+                type: "datetime(6)",
+                nullable: true);
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "ConfirmedByUserId",
+                table: "Orders",
+                type: "char(36)",
+                nullable: true,
+                collation: "ascii_general_ci");
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "CreatedByUserId",
+                table: "Orders",
+                type: "char(36)",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"),
+                collation: "ascii_general_ci");
+
+            // Backfill every existing Order's new CreatedByUserId from its linked Sale (Order.FK_SaleId
+            // was required until this migration, so every pre-existing row has one). Covers every
+            // row generically, not just the two rows seeded via HasData below — otherwise any Order
+            // created outside the EF seed data would keep the temporary AddColumn default
+            // (Guid.Empty) and fail the FK_Orders_Users_CreatedByUserId constraint added at the end
+            // of this migration.
+            migrationBuilder.Sql(@"
+                UPDATE `Orders` o
+                INNER JOIN `Sales` s ON s.`Id` = o.`FK_SaleId`
+                SET o.`CreatedByUserId` = s.`CreatedByUserId`
+                WHERE o.`FK_SaleId` IS NOT NULL;");
+
+            migrationBuilder.AddColumn<Guid>(
+                name: "InvoiceId",
+                table: "Orders",
+                type: "char(36)",
+                nullable: true,
+                collation: "ascii_general_ci");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_OrderItems",
+                table: "OrderItems",
+                column: "Id");
+
+            migrationBuilder.CreateTable(
+                name: "Invoices",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    FK_OrderId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    Status = table.Column<int>(type: "int", nullable: false),
+                    CreatedByUserId = table.Column<Guid>(type: "char(36)", nullable: false, collation: "ascii_general_ci"),
+                    PrintedAt = table.Column<DateTime>(type: "datetime(6)", nullable: true),
+                    PrintedByUserId = table.Column<Guid>(type: "char(36)", nullable: true, collation: "ascii_general_ci"),
+                    FinalizedAt = table.Column<DateTime>(type: "datetime(6)", nullable: true),
+                    FinalizedByUserId = table.Column<Guid>(type: "char(36)", nullable: true, collation: "ascii_general_ci"),
+                    TotalAmount = table.Column<decimal>(type: "decimal(65,30)", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime(6)", nullable: false),
+                    IsActive = table.Column<bool>(type: "tinyint(1)", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Invoices", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Invoices_Orders_FK_OrderId",
+                        column: x => x.FK_OrderId,
+                        principalTable: "Orders",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_Invoices_Users_CreatedByUserId",
+                        column: x => x.CreatedByUserId,
+                        principalTable: "Users",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_Invoices_Users_FinalizedByUserId",
+                        column: x => x.FinalizedByUserId,
+                        principalTable: "Users",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                    table.ForeignKey(
+                        name: "FK_Invoices_Users_PrintedByUserId",
+                        column: x => x.PrintedByUserId,
+                        principalTable: "Users",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Restrict);
+                })
+                .Annotation("MySql:CharSet", "utf8mb4");
+
+            migrationBuilder.InsertData(
+                table: "OrderItems",
+                columns: new[] { "Id", "CreatedAt", "FK_ItemId", "FK_OrderId", "IsActive", "Quantity", "QuantityFulfilled", "UnitPrice" },
+                values: new object[,]
+                {
+                    { new Guid("34000000-0000-0000-0000-000000000001"), new DateTime(2026, 8, 25, 9, 0, 0, 0, DateTimeKind.Unspecified), new Guid("23000000-0000-0000-0000-000000000001"), new Guid("33000000-0000-0000-0000-000000000001"), true, 30, 30, 60m },
+                    { new Guid("34000000-0000-0000-0000-000000000002"), new DateTime(2026, 8, 25, 9, 0, 0, 0, DateTimeKind.Unspecified), new Guid("23000000-0000-0000-0000-000000000003"), new Guid("33000000-0000-0000-0000-000000000001"), true, 24, 24, 50m },
+                    { new Guid("34000000-0000-0000-0000-000000000003"), new DateTime(2026, 8, 30, 10, 0, 0, 0, DateTimeKind.Unspecified), new Guid("23000000-0000-0000-0000-000000000002"), new Guid("33000000-0000-0000-0000-000000000002"), true, 10, 0, 120m }
+                });
+
+            migrationBuilder.UpdateData(
+                table: "Orders",
+                keyColumn: "Id",
+                keyValue: new Guid("33000000-0000-0000-0000-000000000001"),
+                columns: new[] { "ConfirmedAt", "ConfirmedByUserId", "CreatedByUserId", "InvoiceId" },
+                values: new object[] { null, null, new Guid("29000000-0000-0000-0000-000000000002"), null });
+
+            migrationBuilder.UpdateData(
+                table: "Orders",
+                keyColumn: "Id",
+                keyValue: new Guid("33000000-0000-0000-0000-000000000002"),
+                columns: new[] { "ConfirmedAt", "ConfirmedByUserId", "CreatedByUserId", "InvoiceId" },
+                values: new object[] { null, null, new Guid("29000000-0000-0000-0000-000000000003"), null });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Orders_ConfirmedByUserId",
+                table: "Orders",
+                column: "ConfirmedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Orders_CreatedByUserId",
+                table: "Orders",
+                column: "CreatedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Invoices_CreatedByUserId",
+                table: "Invoices",
+                column: "CreatedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Invoices_FinalizedByUserId",
+                table: "Invoices",
+                column: "FinalizedByUserId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Invoices_FK_OrderId",
+                table: "Invoices",
+                column: "FK_OrderId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Invoices_PrintedByUserId",
+                table: "Invoices",
+                column: "PrintedByUserId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Orders_Users_ConfirmedByUserId",
+                table: "Orders",
+                column: "ConfirmedByUserId",
+                principalTable: "Users",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Orders_Users_CreatedByUserId",
+                table: "Orders",
+                column: "CreatedByUserId",
+                principalTable: "Users",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Orders_Users_ConfirmedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Orders_Users_CreatedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropTable(
+                name: "Invoices");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Orders_ConfirmedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Orders_CreatedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropPrimaryKey(
+                name: "PK_OrderItems",
+                table: "OrderItems");
+
+            migrationBuilder.DropIndex(
+                name: "IX_OrderItems_FK_OrderId",
+                table: "OrderItems");
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumn: "Id",
+                keyValue: new Guid("34000000-0000-0000-0000-000000000001"));
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumn: "Id",
+                keyValue: new Guid("34000000-0000-0000-0000-000000000002"));
+
+            migrationBuilder.DeleteData(
+                table: "OrderItems",
+                keyColumn: "Id",
+                keyValue: new Guid("34000000-0000-0000-0000-000000000003"));
+
+            migrationBuilder.DropColumn(
+                name: "ConfirmedAt",
+                table: "Orders");
+
+            migrationBuilder.DropColumn(
+                name: "ConfirmedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropColumn(
+                name: "CreatedByUserId",
+                table: "Orders");
+
+            migrationBuilder.DropColumn(
+                name: "InvoiceId",
+                table: "Orders");
+
+            migrationBuilder.AlterColumn<Guid>(
+                name: "FK_SaleId",
+                table: "Orders",
+                type: "char(36)",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"),
+                collation: "ascii_general_ci",
+                oldClrType: typeof(Guid),
+                oldType: "char(36)",
+                oldNullable: true)
+                .OldAnnotation("Relational:Collation", "ascii_general_ci");
+
+            migrationBuilder.AddPrimaryKey(
+                name: "PK_OrderItems",
+                table: "OrderItems",
+                columns: new[] { "FK_OrderId", "FK_ItemId" });
+
+            migrationBuilder.InsertData(
+                table: "OrderItems",
+                columns: new[] { "FK_ItemId", "FK_OrderId", "CreatedAt", "Id", "IsActive", "Quantity", "QuantityFulfilled", "UnitPrice" },
+                values: new object[,]
+                {
+                    { new Guid("23000000-0000-0000-0000-000000000001"), new Guid("33000000-0000-0000-0000-000000000001"), new DateTime(2026, 8, 25, 9, 0, 0, 0, DateTimeKind.Unspecified), new Guid("34000000-0000-0000-0000-000000000001"), true, 30, 30, 60m },
+                    { new Guid("23000000-0000-0000-0000-000000000003"), new Guid("33000000-0000-0000-0000-000000000001"), new DateTime(2026, 8, 25, 9, 0, 0, 0, DateTimeKind.Unspecified), new Guid("34000000-0000-0000-0000-000000000002"), true, 24, 24, 50m },
+                    { new Guid("23000000-0000-0000-0000-000000000002"), new Guid("33000000-0000-0000-0000-000000000002"), new DateTime(2026, 8, 30, 10, 0, 0, 0, DateTimeKind.Unspecified), new Guid("34000000-0000-0000-0000-000000000003"), true, 10, 0, 120m }
+                });
+        }
+    }
+}