Add project files.

BudgetApp/Migrations/20260301155815_AddRecurringTransactions.cs

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+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace BudgetApp.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddRecurringTransactions : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "ParentTransactionId",
+                table: "Transactions",
+                type: "INTEGER",
+                nullable: true);
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "RecurrenceEndDate",
+                table: "Transactions",
+                type: "TEXT",
+                nullable: true);
+
+            migrationBuilder.AddColumn<int>(
+                name: "RecurrenceType",
+                table: "Transactions",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_Transactions_ParentTransactionId",
+                table: "Transactions",
+                column: "ParentTransactionId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Transactions_Transactions_ParentTransactionId",
+                table: "Transactions",
+                column: "ParentTransactionId",
+                principalTable: "Transactions",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.SetNull);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Transactions_Transactions_ParentTransactionId",
+                table: "Transactions");
+
+            migrationBuilder.DropIndex(
+                name: "IX_Transactions_ParentTransactionId",
+                table: "Transactions");
+
+            migrationBuilder.DropColumn(
+                name: "ParentTransactionId",
+                table: "Transactions");
+
+            migrationBuilder.DropColumn(
+                name: "RecurrenceEndDate",
+                table: "Transactions");
+
+            migrationBuilder.DropColumn(
+                name: "RecurrenceType",
+                table: "Transactions");
+        }
+    }
+}